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Posted to users@myfaces.apache.org by Martin Grotzke <ma...@javakaffee.de> on 2006/12/11 16:17:46 UTC
How to handle/display errors during render response
Hi all,
I have a case where I perform some logic during the RENDER_RESPONSE
phase where an error might occurs and I want to display some error
message - which is unfortunately not displayed directly. But with the
next request/response the error message is displayed. I asume that this
is the case because the h:messages component is already rendered - so
the behavior should basically be correct.
Do you have any suggestions how to handle this?
The concrete case is when the details of a dataTable (facet detailStamp)
are displayed - just comes into my mind to use a CustomHtmlDataTable
component that overrides the toggleDetail method... What do you think?
Thanx in advance,
cheers,
Martin
Re: How to handle/display errors during render response
Posted by Martin Grotzke <ma...@javakaffee.de>.
On Tue, 2006-12-12 at 12:14 -0500, Mike Kienenberger wrote:
> Actually, I mean this link:
>
> http://wiki.java.net/bin/view/Projects/FaceletsTaglibFiles
>
> There is java code embedded in the examples for tags that cannot be
> handled entirely in taglib.xml files. It'd probably be nice if
> someone created an index into that page's java code examples and added
> them to the other example page too.
Yeah, especially on the tomahawk page are some good examples
that show how the ComponentHandler can be used.
Thanx for the link,
cheers,
Martin
>
> For a well-written component (one that doesn't put component logic
> into the jsp tag handler), the only time you'd need a component tag
> handler is to specify MethodRules.
>
> In all the other cases, you'd be better off fixing the component
> itself provided you had the soruce code.
>
>
> On 12/12/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > On Tue, 2006-12-12 at 10:54 -0500, Mike Kienenberger wrote:
> > > Another resource to consider when writing facelets componenthandlers
> > > and taghandlers is the facelets wiki. There's a few examples
> > > available there.
> > Do you mean http://wiki.java.net/bin/view/Projects/FaceletsExamples?
> > These are examples that show what can be done, but now how...
> >
> > > 90% of the time, it's simply a matter of applying a
> > > MethodRule since method signatures are the one thing that facelets
> > > cannot autodetect :-)
> > This is good to know, and then it's even better to have the
> > MethodRule ;-)
> >
> > Cheers,
> > Martin
> >
> > >
> > >
> > > On 12/12/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > Hello Mike,
> > > >
> > > > On Mon, 2006-12-11 at 15:37 -0500, Mike Kienenberger wrote:
> > > > > I think you made the facelets tag handler harder that necessary. Not
> > > > > sure about the "void.class" syntax below, but you can probably figure
> > > > > out the correct syntax.
> > > > Thanx a lot, this is a great simplification! (and the void.class is
> > > > correct :))
> > > > I wrote the tag handler according to what I've seen in the facelets
> > > > sources, knew (read) nothing about MethodRule :)
> > > >
> > > > Thanx again,
> > > > cheers,
> > > > Martin
> > > >
> > > >
> > > > >
> > > > >
> > > > > private static final String ACTION_LISTENER_ATT_NAME =
> > > > > "toggleDetailActionListener";
> > > > >
> > > > > public final static Class[] ACTION_LISTENER_SIG = new Class[] {
> > > > > ActionEvent.class };
> > > > > protected final static MethodRule actionListenerTagRule
> > > > > = new MethodRule(ACTION_LISTENER_ATT_NAME, void.class,
> > > > > ACTION_LISTENER_SIG);
> > > > >
> > > > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > > > super( config );
> > > > > }
> > > > >
> > > > > protected MetaRuleset createMetaRuleset(Class type)
> > > > > {
> > > > > MetaRuleset m = super.createMetaRuleset(type);
> > > > >
> > > > > m.addRule(actionListenerTagRule);
> > > > >
> > > > > return m;
> > > > > }
> > > > >
> > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > > > On Mon, 2006-12-11 at 20:37 +0100, Martin Grotzke wrote:
> > > > > > > On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> > > > > > > > "When myBean.myModel.myOptions is invoked the first time, I do some
> > > > > > > > lazy
> > > > > > > > initialization, this might cause errors..."
> > > > > > > >
> > > > > > > > I would recommend that you load this data in the on load method of
> > > > > > > > your page. This way, if it fails, you can handle the error in any way
> > > > > > > > you want, including redirecting to an error page.
> > > > > > > I cannot do this, because I have to initialize the detailStamps of
> > > > > > > all rows separately: the details of one item cause several backend
> > > > > > > requests that might cost money, and they definitively need time
> > > > > > > to return (several seconds per request).
> > > > > > >
> > > > > > > Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
> > > > > > > provides an additional MethodBinding "toggleDetailActionListener".
> > > > > >
> > > > > > Btw, I just posted the complete example here:
> > > > > > http://www.javakaffee.de/blog/2006/12/11/how-to-add-a-new-attribute-to-an-existing-jsf-component-using-facelets/
> > > > > >
> > > > > > Perhaps it's useful for someone...
> > > > > >
> > > > > > Cheers,
> > > > > > Martin
> > > > > >
> > > > > >
> > > > > > >
> > > > > > >
> > > > > > > The toggleDetail method is extended so that it invokes also the method
> > > > > > > binding if it's provided.
> > > > > > >
> > > > > > > The hardest thing was to write the facelets MetaTagHandler that sets
> > > > > > > the attribute on the CustomHtmlDataTable:
> > > > > > >
> > > > > > > public final class CustomHtmlDataTableHandler extends ComponentHandler {
> > > > > > >
> > > > > > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > > > > > super( config );
> > > > > > > }
> > > > > > >
> > > > > > > protected MetaRuleset createMetaRuleset(Class type) {
> > > > > > > return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
> > > > > > > }
> > > > > > >
> > > > > > > static final class ActionSourceRule extends MetaRule {
> > > > > > >
> > > > > > > private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
> > > > > > >
> > > > > > > public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
> > > > > > >
> > > > > > > final static class ActionListenerMapper extends Metadata {
> > > > > > >
> > > > > > > private final TagAttribute attr;
> > > > > > >
> > > > > > > public ActionListenerMapper(TagAttribute attr) {
> > > > > > > this.attr = attr;
> > > > > > > }
> > > > > > >
> > > > > > > public void applyMetadata(FaceletContext ctx, Object instance) {
> > > > > > > ((CustomHtmlDataTable) instance)
> > > > > > > .setToggleDetailActionListener( new LegacyMethodBinding(this.attr
> > > > > > > .getMethodExpression(ctx, null,
> > > > > > > ActionSourceRule.ACTION_LISTENER_SIG)));
> > > > > > > }
> > > > > > >
> > > > > > > }
> > > > > > >
> > > > > > > public final static ActionSourceRule Instance = new ActionSourceRule();
> > > > > > >
> > > > > > > public ActionSourceRule() {
> > > > > > > super();
> > > > > > > }
> > > > > > >
> > > > > > > public Metadata applyRule(String name, TagAttribute attribute,
> > > > > > > MetadataTarget meta) {
> > > > > > > if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
> > > > > > >
> > > > > > > if (ACTION_LISTENER_ATT_NAME.equals(name)) {
> > > > > > > return new ActionListenerMapper(attribute);
> > > > > > > }
> > > > > > > }
> > > > > > > return null;
> > > > > > > }
> > > > > > > }
> > > > > > >
> > > > > > > }
> > > > > > >
> > > > > > >
> > > > > > > I hope this is basically the correct approach...
> > > > > > >
> > > > > > > Cheers,
> > > > > > > Martin
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > Use one of these technologies:
> > > > > > > >
> > > > > > > > 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
> > > > > > > >
> > > > > > > > <page view-id="/index.xhtml"
> > > > > > > > action="#{welcomeBean.onLoad}" />
> > > > > > > >
> > > > > > > > 2) On-load from jsf-comp:
> > > > > > > > http://jsf-comp.sourceforge.net/components/onload/index.html
> > > > > > > >
> > > > > > > > 3) or use Shale (I have no experience with this one):
> > > > > > > > http://shale.apache.org/shale-view/index.html
> > > > > > > >
> > > > > > > > -Andrew
> > > > > > > >
> > > > > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > > > > > On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > > > > > > > > Hello Martin,
> > > > > > > > >
> > > > > > > > > Can you provide a mopre explicit example of the use case
> > > > > > > > please?
> > > > > > > > Sorry for the few words, if you think about a problem for
> > > > > > > > several days
> > > > > > > > to you it seems just too clear ;)
> > > > > > > >
> > > > > > > > What I have is a datatable in a template with the detailStamp
> > > > > > > > facet:
> > > > > > > >
> > > > > > > > <table jsfc="t:dataTable"
> > > > > > > > ...
> > > > > > > > value="#{myBean.myModel}"
> > > > > > > > var="myItem"
> > > > > > > > varDetailToggler="detailToggler">
> > > > > > > >
> > > > > > > > ... some columns ...
> > > > > > > >
> > > > > > > > <span jsfc="f:facet" name="detailStamp">
> > > > > > > > <ui:include src=" itemdetails.xhtml">
> > > > > > > > <ui:param name="item"
> > > > > > > > value="#{myItem}"/>
> > > > > > > > </ui:include>
> > > > > > > > </span>
> > > > > > > > </table>
> > > > > > > >
> > > > > > > > The itemdetails.xhtml displays details to the item, e.g. it
> > > > > > > > iterates
> > > > > > > > over some detail options like the following:
> > > > > > > >
> > > > > > > > <ui:repeat var="option" value="#{item.myOptions}">
> > > > > > > > #{option.description}
> > > > > > > > </ui:repeat>
> > > > > > > >
> > > > > > > > So the the myBean.myModel.myOptions method is requested when
> > > > > > > > the detailStamp
> > > > > > > > is displayed for one item, this method is invoked when
> > > > > > > > rendering happens.
> > > > > > > >
> > > > > > > > When myBean.myModel.myOptions is invoked the first time, I do
> > > > > > > > some lazy
> > > > > > > > initialization, this might cause errors...
> > > > > > > >
> > > > > > > > I do not see how I could do the processing in the invoke
> > > > > > > > application, because
> > > > > > > > the detailStamp is shown via HtmlDataTable.toggleDetail, which
> > > > > > > > is invoked
> > > > > > > > during invoke-application, but there's no possibility of
> > > > > > > > specifying a listener
> > > > > > > > that is invoked when toggleDetail is invoked...
> > > > > > > >
> > > > > > > > I hope this clarifies the problem a little bit, if s.th. is
> > > > > > > > missing please
> > > > > > > > let me know!
> > > > > > > >
> > > > > > > > Thanx a lot,
> > > > > > > > cheers,
> > > > > > > > Martin
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > > Why can't you do the processing in the invoke application
> > > > > > > > phase?
> > > > > > > > > Without more details, all I could suggest is to use a render
> > > > > > > > response
> > > > > > > > > phase listener and add your logic in the beforePhase
> > > > > > > > method.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > Regards,
> > > > > > > > >
> > > > > > > > > ~ Simon
> > > > > > > > >
> > > > > > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> > > > > > > > wrote:
> > > > > > > > > Hi all,
> > > > > > > > >
> > > > > > > > > I have a case where I perform some logic during the
> > > > > > > > > RENDER_RESPONSE
> > > > > > > > > phase where an error might occurs and I want to
> > > > > > > > display some
> > > > > > > > > error
> > > > > > > > > message - which is unfortunately not displayed
> > > > > > > > directly. But
> > > > > > > > > with the
> > > > > > > > > next request/response the error message is
> > > > > > > > displayed. I asume
> > > > > > > > > that this
> > > > > > > > > is the case because the h:messages component is
> > > > > > > > already
> > > > > > > > > rendered - so
> > > > > > > > > the behavior should basically be correct.
> > > > > > > > >
> > > > > > > > > Do you have any suggestions how to handle this?
> > > > > > > > >
> > > > > > > > > The concrete case is when the details of a dataTable
> > > > > > > > (facet
> > > > > > > > > detailStamp)
> > > > > > > > > are displayed - just comes into my mind to use a
> > > > > > > > > CustomHtmlDataTable
> > > > > > > > > component that overrides the toggleDetail method...
> > > > > > > > What do
> > > > > > > > > you think?
> > > > > > > > >
> > > > > > > > > Thanx in advance,
> > > > > > > > > cheers,
> > > > > > > > > Martin
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > --
> > > > > > > > Martin Grotzke
> > > > > > > > http://www.javakaffee.de/blog/
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > --
> > > > > > Martin Grotzke
> > > > > > http://www.javakaffee.de/blog/
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > --
> > > > Martin Grotzke
> > > > http://www.javakaffee.de/blog/
> > > >
> > > >
> > > >
> > >
> > --
> > Martin Grotzke
> > http://www.javakaffee.de/blog/
> >
> >
> >
>
--
Martin Grotzke
http://www.javakaffee.de/blog/
Re: How to handle/display errors during render response
Posted by Mike Kienenberger <mk...@gmail.com>.
Actually, I mean this link:
http://wiki.java.net/bin/view/Projects/FaceletsTaglibFiles
There is java code embedded in the examples for tags that cannot be
handled entirely in taglib.xml files. It'd probably be nice if
someone created an index into that page's java code examples and added
them to the other example page too.
For a well-written component (one that doesn't put component logic
into the jsp tag handler), the only time you'd need a component tag
handler is to specify MethodRules.
In all the other cases, you'd be better off fixing the component
itself provided you had the soruce code.
On 12/12/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> On Tue, 2006-12-12 at 10:54 -0500, Mike Kienenberger wrote:
> > Another resource to consider when writing facelets componenthandlers
> > and taghandlers is the facelets wiki. There's a few examples
> > available there.
> Do you mean http://wiki.java.net/bin/view/Projects/FaceletsExamples?
> These are examples that show what can be done, but now how...
>
> > 90% of the time, it's simply a matter of applying a
> > MethodRule since method signatures are the one thing that facelets
> > cannot autodetect :-)
> This is good to know, and then it's even better to have the
> MethodRule ;-)
>
> Cheers,
> Martin
>
> >
> >
> > On 12/12/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > Hello Mike,
> > >
> > > On Mon, 2006-12-11 at 15:37 -0500, Mike Kienenberger wrote:
> > > > I think you made the facelets tag handler harder that necessary. Not
> > > > sure about the "void.class" syntax below, but you can probably figure
> > > > out the correct syntax.
> > > Thanx a lot, this is a great simplification! (and the void.class is
> > > correct :))
> > > I wrote the tag handler according to what I've seen in the facelets
> > > sources, knew (read) nothing about MethodRule :)
> > >
> > > Thanx again,
> > > cheers,
> > > Martin
> > >
> > >
> > > >
> > > >
> > > > private static final String ACTION_LISTENER_ATT_NAME =
> > > > "toggleDetailActionListener";
> > > >
> > > > public final static Class[] ACTION_LISTENER_SIG = new Class[] {
> > > > ActionEvent.class };
> > > > protected final static MethodRule actionListenerTagRule
> > > > = new MethodRule(ACTION_LISTENER_ATT_NAME, void.class,
> > > > ACTION_LISTENER_SIG);
> > > >
> > > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > > super( config );
> > > > }
> > > >
> > > > protected MetaRuleset createMetaRuleset(Class type)
> > > > {
> > > > MetaRuleset m = super.createMetaRuleset(type);
> > > >
> > > > m.addRule(actionListenerTagRule);
> > > >
> > > > return m;
> > > > }
> > > >
> > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > > On Mon, 2006-12-11 at 20:37 +0100, Martin Grotzke wrote:
> > > > > > On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> > > > > > > "When myBean.myModel.myOptions is invoked the first time, I do some
> > > > > > > lazy
> > > > > > > initialization, this might cause errors..."
> > > > > > >
> > > > > > > I would recommend that you load this data in the on load method of
> > > > > > > your page. This way, if it fails, you can handle the error in any way
> > > > > > > you want, including redirecting to an error page.
> > > > > > I cannot do this, because I have to initialize the detailStamps of
> > > > > > all rows separately: the details of one item cause several backend
> > > > > > requests that might cost money, and they definitively need time
> > > > > > to return (several seconds per request).
> > > > > >
> > > > > > Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
> > > > > > provides an additional MethodBinding "toggleDetailActionListener".
> > > > >
> > > > > Btw, I just posted the complete example here:
> > > > > http://www.javakaffee.de/blog/2006/12/11/how-to-add-a-new-attribute-to-an-existing-jsf-component-using-facelets/
> > > > >
> > > > > Perhaps it's useful for someone...
> > > > >
> > > > > Cheers,
> > > > > Martin
> > > > >
> > > > >
> > > > > >
> > > > > >
> > > > > > The toggleDetail method is extended so that it invokes also the method
> > > > > > binding if it's provided.
> > > > > >
> > > > > > The hardest thing was to write the facelets MetaTagHandler that sets
> > > > > > the attribute on the CustomHtmlDataTable:
> > > > > >
> > > > > > public final class CustomHtmlDataTableHandler extends ComponentHandler {
> > > > > >
> > > > > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > > > > super( config );
> > > > > > }
> > > > > >
> > > > > > protected MetaRuleset createMetaRuleset(Class type) {
> > > > > > return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
> > > > > > }
> > > > > >
> > > > > > static final class ActionSourceRule extends MetaRule {
> > > > > >
> > > > > > private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
> > > > > >
> > > > > > public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
> > > > > >
> > > > > > final static class ActionListenerMapper extends Metadata {
> > > > > >
> > > > > > private final TagAttribute attr;
> > > > > >
> > > > > > public ActionListenerMapper(TagAttribute attr) {
> > > > > > this.attr = attr;
> > > > > > }
> > > > > >
> > > > > > public void applyMetadata(FaceletContext ctx, Object instance) {
> > > > > > ((CustomHtmlDataTable) instance)
> > > > > > .setToggleDetailActionListener( new LegacyMethodBinding(this.attr
> > > > > > .getMethodExpression(ctx, null,
> > > > > > ActionSourceRule.ACTION_LISTENER_SIG)));
> > > > > > }
> > > > > >
> > > > > > }
> > > > > >
> > > > > > public final static ActionSourceRule Instance = new ActionSourceRule();
> > > > > >
> > > > > > public ActionSourceRule() {
> > > > > > super();
> > > > > > }
> > > > > >
> > > > > > public Metadata applyRule(String name, TagAttribute attribute,
> > > > > > MetadataTarget meta) {
> > > > > > if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
> > > > > >
> > > > > > if (ACTION_LISTENER_ATT_NAME.equals(name)) {
> > > > > > return new ActionListenerMapper(attribute);
> > > > > > }
> > > > > > }
> > > > > > return null;
> > > > > > }
> > > > > > }
> > > > > >
> > > > > > }
> > > > > >
> > > > > >
> > > > > > I hope this is basically the correct approach...
> > > > > >
> > > > > > Cheers,
> > > > > > Martin
> > > > > >
> > > > > >
> > > > > >
> > > > > > > Use one of these technologies:
> > > > > > >
> > > > > > > 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
> > > > > > >
> > > > > > > <page view-id="/index.xhtml"
> > > > > > > action="#{welcomeBean.onLoad}" />
> > > > > > >
> > > > > > > 2) On-load from jsf-comp:
> > > > > > > http://jsf-comp.sourceforge.net/components/onload/index.html
> > > > > > >
> > > > > > > 3) or use Shale (I have no experience with this one):
> > > > > > > http://shale.apache.org/shale-view/index.html
> > > > > > >
> > > > > > > -Andrew
> > > > > > >
> > > > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > > > > On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > > > > > > > Hello Martin,
> > > > > > > >
> > > > > > > > Can you provide a mopre explicit example of the use case
> > > > > > > please?
> > > > > > > Sorry for the few words, if you think about a problem for
> > > > > > > several days
> > > > > > > to you it seems just too clear ;)
> > > > > > >
> > > > > > > What I have is a datatable in a template with the detailStamp
> > > > > > > facet:
> > > > > > >
> > > > > > > <table jsfc="t:dataTable"
> > > > > > > ...
> > > > > > > value="#{myBean.myModel}"
> > > > > > > var="myItem"
> > > > > > > varDetailToggler="detailToggler">
> > > > > > >
> > > > > > > ... some columns ...
> > > > > > >
> > > > > > > <span jsfc="f:facet" name="detailStamp">
> > > > > > > <ui:include src=" itemdetails.xhtml">
> > > > > > > <ui:param name="item"
> > > > > > > value="#{myItem}"/>
> > > > > > > </ui:include>
> > > > > > > </span>
> > > > > > > </table>
> > > > > > >
> > > > > > > The itemdetails.xhtml displays details to the item, e.g. it
> > > > > > > iterates
> > > > > > > over some detail options like the following:
> > > > > > >
> > > > > > > <ui:repeat var="option" value="#{item.myOptions}">
> > > > > > > #{option.description}
> > > > > > > </ui:repeat>
> > > > > > >
> > > > > > > So the the myBean.myModel.myOptions method is requested when
> > > > > > > the detailStamp
> > > > > > > is displayed for one item, this method is invoked when
> > > > > > > rendering happens.
> > > > > > >
> > > > > > > When myBean.myModel.myOptions is invoked the first time, I do
> > > > > > > some lazy
> > > > > > > initialization, this might cause errors...
> > > > > > >
> > > > > > > I do not see how I could do the processing in the invoke
> > > > > > > application, because
> > > > > > > the detailStamp is shown via HtmlDataTable.toggleDetail, which
> > > > > > > is invoked
> > > > > > > during invoke-application, but there's no possibility of
> > > > > > > specifying a listener
> > > > > > > that is invoked when toggleDetail is invoked...
> > > > > > >
> > > > > > > I hope this clarifies the problem a little bit, if s.th. is
> > > > > > > missing please
> > > > > > > let me know!
> > > > > > >
> > > > > > > Thanx a lot,
> > > > > > > cheers,
> > > > > > > Martin
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > Why can't you do the processing in the invoke application
> > > > > > > phase?
> > > > > > > > Without more details, all I could suggest is to use a render
> > > > > > > response
> > > > > > > > phase listener and add your logic in the beforePhase
> > > > > > > method.
> > > > > > > >
> > > > > > > >
> > > > > > > > Regards,
> > > > > > > >
> > > > > > > > ~ Simon
> > > > > > > >
> > > > > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> > > > > > > wrote:
> > > > > > > > Hi all,
> > > > > > > >
> > > > > > > > I have a case where I perform some logic during the
> > > > > > > > RENDER_RESPONSE
> > > > > > > > phase where an error might occurs and I want to
> > > > > > > display some
> > > > > > > > error
> > > > > > > > message - which is unfortunately not displayed
> > > > > > > directly. But
> > > > > > > > with the
> > > > > > > > next request/response the error message is
> > > > > > > displayed. I asume
> > > > > > > > that this
> > > > > > > > is the case because the h:messages component is
> > > > > > > already
> > > > > > > > rendered - so
> > > > > > > > the behavior should basically be correct.
> > > > > > > >
> > > > > > > > Do you have any suggestions how to handle this?
> > > > > > > >
> > > > > > > > The concrete case is when the details of a dataTable
> > > > > > > (facet
> > > > > > > > detailStamp)
> > > > > > > > are displayed - just comes into my mind to use a
> > > > > > > > CustomHtmlDataTable
> > > > > > > > component that overrides the toggleDetail method...
> > > > > > > What do
> > > > > > > > you think?
> > > > > > > >
> > > > > > > > Thanx in advance,
> > > > > > > > cheers,
> > > > > > > > Martin
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > --
> > > > > > > Martin Grotzke
> > > > > > > http://www.javakaffee.de/blog/
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > --
> > > > > Martin Grotzke
> > > > > http://www.javakaffee.de/blog/
> > > > >
> > > > >
> > > > >
> > > >
> > > --
> > > Martin Grotzke
> > > http://www.javakaffee.de/blog/
> > >
> > >
> > >
> >
> --
> Martin Grotzke
> http://www.javakaffee.de/blog/
>
>
>
Re: How to handle/display errors during render response
Posted by Martin Grotzke <ma...@javakaffee.de>.
On Tue, 2006-12-12 at 10:54 -0500, Mike Kienenberger wrote:
> Another resource to consider when writing facelets componenthandlers
> and taghandlers is the facelets wiki. There's a few examples
> available there.
Do you mean http://wiki.java.net/bin/view/Projects/FaceletsExamples?
These are examples that show what can be done, but now how...
> 90% of the time, it's simply a matter of applying a
> MethodRule since method signatures are the one thing that facelets
> cannot autodetect :-)
This is good to know, and then it's even better to have the
MethodRule ;-)
Cheers,
Martin
>
>
> On 12/12/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > Hello Mike,
> >
> > On Mon, 2006-12-11 at 15:37 -0500, Mike Kienenberger wrote:
> > > I think you made the facelets tag handler harder that necessary. Not
> > > sure about the "void.class" syntax below, but you can probably figure
> > > out the correct syntax.
> > Thanx a lot, this is a great simplification! (and the void.class is
> > correct :))
> > I wrote the tag handler according to what I've seen in the facelets
> > sources, knew (read) nothing about MethodRule :)
> >
> > Thanx again,
> > cheers,
> > Martin
> >
> >
> > >
> > >
> > > private static final String ACTION_LISTENER_ATT_NAME =
> > > "toggleDetailActionListener";
> > >
> > > public final static Class[] ACTION_LISTENER_SIG = new Class[] {
> > > ActionEvent.class };
> > > protected final static MethodRule actionListenerTagRule
> > > = new MethodRule(ACTION_LISTENER_ATT_NAME, void.class,
> > > ACTION_LISTENER_SIG);
> > >
> > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > super( config );
> > > }
> > >
> > > protected MetaRuleset createMetaRuleset(Class type)
> > > {
> > > MetaRuleset m = super.createMetaRuleset(type);
> > >
> > > m.addRule(actionListenerTagRule);
> > >
> > > return m;
> > > }
> > >
> > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > On Mon, 2006-12-11 at 20:37 +0100, Martin Grotzke wrote:
> > > > > On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> > > > > > "When myBean.myModel.myOptions is invoked the first time, I do some
> > > > > > lazy
> > > > > > initialization, this might cause errors..."
> > > > > >
> > > > > > I would recommend that you load this data in the on load method of
> > > > > > your page. This way, if it fails, you can handle the error in any way
> > > > > > you want, including redirecting to an error page.
> > > > > I cannot do this, because I have to initialize the detailStamps of
> > > > > all rows separately: the details of one item cause several backend
> > > > > requests that might cost money, and they definitively need time
> > > > > to return (several seconds per request).
> > > > >
> > > > > Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
> > > > > provides an additional MethodBinding "toggleDetailActionListener".
> > > >
> > > > Btw, I just posted the complete example here:
> > > > http://www.javakaffee.de/blog/2006/12/11/how-to-add-a-new-attribute-to-an-existing-jsf-component-using-facelets/
> > > >
> > > > Perhaps it's useful for someone...
> > > >
> > > > Cheers,
> > > > Martin
> > > >
> > > >
> > > > >
> > > > >
> > > > > The toggleDetail method is extended so that it invokes also the method
> > > > > binding if it's provided.
> > > > >
> > > > > The hardest thing was to write the facelets MetaTagHandler that sets
> > > > > the attribute on the CustomHtmlDataTable:
> > > > >
> > > > > public final class CustomHtmlDataTableHandler extends ComponentHandler {
> > > > >
> > > > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > > > super( config );
> > > > > }
> > > > >
> > > > > protected MetaRuleset createMetaRuleset(Class type) {
> > > > > return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
> > > > > }
> > > > >
> > > > > static final class ActionSourceRule extends MetaRule {
> > > > >
> > > > > private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
> > > > >
> > > > > public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
> > > > >
> > > > > final static class ActionListenerMapper extends Metadata {
> > > > >
> > > > > private final TagAttribute attr;
> > > > >
> > > > > public ActionListenerMapper(TagAttribute attr) {
> > > > > this.attr = attr;
> > > > > }
> > > > >
> > > > > public void applyMetadata(FaceletContext ctx, Object instance) {
> > > > > ((CustomHtmlDataTable) instance)
> > > > > .setToggleDetailActionListener( new LegacyMethodBinding(this.attr
> > > > > .getMethodExpression(ctx, null,
> > > > > ActionSourceRule.ACTION_LISTENER_SIG)));
> > > > > }
> > > > >
> > > > > }
> > > > >
> > > > > public final static ActionSourceRule Instance = new ActionSourceRule();
> > > > >
> > > > > public ActionSourceRule() {
> > > > > super();
> > > > > }
> > > > >
> > > > > public Metadata applyRule(String name, TagAttribute attribute,
> > > > > MetadataTarget meta) {
> > > > > if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
> > > > >
> > > > > if (ACTION_LISTENER_ATT_NAME.equals(name)) {
> > > > > return new ActionListenerMapper(attribute);
> > > > > }
> > > > > }
> > > > > return null;
> > > > > }
> > > > > }
> > > > >
> > > > > }
> > > > >
> > > > >
> > > > > I hope this is basically the correct approach...
> > > > >
> > > > > Cheers,
> > > > > Martin
> > > > >
> > > > >
> > > > >
> > > > > > Use one of these technologies:
> > > > > >
> > > > > > 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
> > > > > >
> > > > > > <page view-id="/index.xhtml"
> > > > > > action="#{welcomeBean.onLoad}" />
> > > > > >
> > > > > > 2) On-load from jsf-comp:
> > > > > > http://jsf-comp.sourceforge.net/components/onload/index.html
> > > > > >
> > > > > > 3) or use Shale (I have no experience with this one):
> > > > > > http://shale.apache.org/shale-view/index.html
> > > > > >
> > > > > > -Andrew
> > > > > >
> > > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > > > On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > > > > > > Hello Martin,
> > > > > > >
> > > > > > > Can you provide a mopre explicit example of the use case
> > > > > > please?
> > > > > > Sorry for the few words, if you think about a problem for
> > > > > > several days
> > > > > > to you it seems just too clear ;)
> > > > > >
> > > > > > What I have is a datatable in a template with the detailStamp
> > > > > > facet:
> > > > > >
> > > > > > <table jsfc="t:dataTable"
> > > > > > ...
> > > > > > value="#{myBean.myModel}"
> > > > > > var="myItem"
> > > > > > varDetailToggler="detailToggler">
> > > > > >
> > > > > > ... some columns ...
> > > > > >
> > > > > > <span jsfc="f:facet" name="detailStamp">
> > > > > > <ui:include src=" itemdetails.xhtml">
> > > > > > <ui:param name="item"
> > > > > > value="#{myItem}"/>
> > > > > > </ui:include>
> > > > > > </span>
> > > > > > </table>
> > > > > >
> > > > > > The itemdetails.xhtml displays details to the item, e.g. it
> > > > > > iterates
> > > > > > over some detail options like the following:
> > > > > >
> > > > > > <ui:repeat var="option" value="#{item.myOptions}">
> > > > > > #{option.description}
> > > > > > </ui:repeat>
> > > > > >
> > > > > > So the the myBean.myModel.myOptions method is requested when
> > > > > > the detailStamp
> > > > > > is displayed for one item, this method is invoked when
> > > > > > rendering happens.
> > > > > >
> > > > > > When myBean.myModel.myOptions is invoked the first time, I do
> > > > > > some lazy
> > > > > > initialization, this might cause errors...
> > > > > >
> > > > > > I do not see how I could do the processing in the invoke
> > > > > > application, because
> > > > > > the detailStamp is shown via HtmlDataTable.toggleDetail, which
> > > > > > is invoked
> > > > > > during invoke-application, but there's no possibility of
> > > > > > specifying a listener
> > > > > > that is invoked when toggleDetail is invoked...
> > > > > >
> > > > > > I hope this clarifies the problem a little bit, if s.th. is
> > > > > > missing please
> > > > > > let me know!
> > > > > >
> > > > > > Thanx a lot,
> > > > > > cheers,
> > > > > > Martin
> > > > > >
> > > > > >
> > > > > >
> > > > > > > Why can't you do the processing in the invoke application
> > > > > > phase?
> > > > > > > Without more details, all I could suggest is to use a render
> > > > > > response
> > > > > > > phase listener and add your logic in the beforePhase
> > > > > > method.
> > > > > > >
> > > > > > >
> > > > > > > Regards,
> > > > > > >
> > > > > > > ~ Simon
> > > > > > >
> > > > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> > > > > > wrote:
> > > > > > > Hi all,
> > > > > > >
> > > > > > > I have a case where I perform some logic during the
> > > > > > > RENDER_RESPONSE
> > > > > > > phase where an error might occurs and I want to
> > > > > > display some
> > > > > > > error
> > > > > > > message - which is unfortunately not displayed
> > > > > > directly. But
> > > > > > > with the
> > > > > > > next request/response the error message is
> > > > > > displayed. I asume
> > > > > > > that this
> > > > > > > is the case because the h:messages component is
> > > > > > already
> > > > > > > rendered - so
> > > > > > > the behavior should basically be correct.
> > > > > > >
> > > > > > > Do you have any suggestions how to handle this?
> > > > > > >
> > > > > > > The concrete case is when the details of a dataTable
> > > > > > (facet
> > > > > > > detailStamp)
> > > > > > > are displayed - just comes into my mind to use a
> > > > > > > CustomHtmlDataTable
> > > > > > > component that overrides the toggleDetail method...
> > > > > > What do
> > > > > > > you think?
> > > > > > >
> > > > > > > Thanx in advance,
> > > > > > > cheers,
> > > > > > > Martin
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > --
> > > > > > Martin Grotzke
> > > > > > http://www.javakaffee.de/blog/
> > > > > >
> > > > > >
> > > > > >
> > > > --
> > > > Martin Grotzke
> > > > http://www.javakaffee.de/blog/
> > > >
> > > >
> > > >
> > >
> > --
> > Martin Grotzke
> > http://www.javakaffee.de/blog/
> >
> >
> >
>
--
Martin Grotzke
http://www.javakaffee.de/blog/
Re: How to handle/display errors during render response
Posted by Mike Kienenberger <mk...@gmail.com>.
Another resource to consider when writing facelets componenthandlers
and taghandlers is the facelets wiki. There's a few examples
available there. 90% of the time, it's simply a matter of applying a
MethodRule since method signatures are the one thing that facelets
cannot autodetect :-)
On 12/12/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> Hello Mike,
>
> On Mon, 2006-12-11 at 15:37 -0500, Mike Kienenberger wrote:
> > I think you made the facelets tag handler harder that necessary. Not
> > sure about the "void.class" syntax below, but you can probably figure
> > out the correct syntax.
> Thanx a lot, this is a great simplification! (and the void.class is
> correct :))
> I wrote the tag handler according to what I've seen in the facelets
> sources, knew (read) nothing about MethodRule :)
>
> Thanx again,
> cheers,
> Martin
>
>
> >
> >
> > private static final String ACTION_LISTENER_ATT_NAME =
> > "toggleDetailActionListener";
> >
> > public final static Class[] ACTION_LISTENER_SIG = new Class[] {
> > ActionEvent.class };
> > protected final static MethodRule actionListenerTagRule
> > = new MethodRule(ACTION_LISTENER_ATT_NAME, void.class,
> > ACTION_LISTENER_SIG);
> >
> > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > super( config );
> > }
> >
> > protected MetaRuleset createMetaRuleset(Class type)
> > {
> > MetaRuleset m = super.createMetaRuleset(type);
> >
> > m.addRule(actionListenerTagRule);
> >
> > return m;
> > }
> >
> > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > On Mon, 2006-12-11 at 20:37 +0100, Martin Grotzke wrote:
> > > > On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> > > > > "When myBean.myModel.myOptions is invoked the first time, I do some
> > > > > lazy
> > > > > initialization, this might cause errors..."
> > > > >
> > > > > I would recommend that you load this data in the on load method of
> > > > > your page. This way, if it fails, you can handle the error in any way
> > > > > you want, including redirecting to an error page.
> > > > I cannot do this, because I have to initialize the detailStamps of
> > > > all rows separately: the details of one item cause several backend
> > > > requests that might cost money, and they definitively need time
> > > > to return (several seconds per request).
> > > >
> > > > Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
> > > > provides an additional MethodBinding "toggleDetailActionListener".
> > >
> > > Btw, I just posted the complete example here:
> > > http://www.javakaffee.de/blog/2006/12/11/how-to-add-a-new-attribute-to-an-existing-jsf-component-using-facelets/
> > >
> > > Perhaps it's useful for someone...
> > >
> > > Cheers,
> > > Martin
> > >
> > >
> > > >
> > > >
> > > > The toggleDetail method is extended so that it invokes also the method
> > > > binding if it's provided.
> > > >
> > > > The hardest thing was to write the facelets MetaTagHandler that sets
> > > > the attribute on the CustomHtmlDataTable:
> > > >
> > > > public final class CustomHtmlDataTableHandler extends ComponentHandler {
> > > >
> > > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > > super( config );
> > > > }
> > > >
> > > > protected MetaRuleset createMetaRuleset(Class type) {
> > > > return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
> > > > }
> > > >
> > > > static final class ActionSourceRule extends MetaRule {
> > > >
> > > > private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
> > > >
> > > > public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
> > > >
> > > > final static class ActionListenerMapper extends Metadata {
> > > >
> > > > private final TagAttribute attr;
> > > >
> > > > public ActionListenerMapper(TagAttribute attr) {
> > > > this.attr = attr;
> > > > }
> > > >
> > > > public void applyMetadata(FaceletContext ctx, Object instance) {
> > > > ((CustomHtmlDataTable) instance)
> > > > .setToggleDetailActionListener( new LegacyMethodBinding(this.attr
> > > > .getMethodExpression(ctx, null,
> > > > ActionSourceRule.ACTION_LISTENER_SIG)));
> > > > }
> > > >
> > > > }
> > > >
> > > > public final static ActionSourceRule Instance = new ActionSourceRule();
> > > >
> > > > public ActionSourceRule() {
> > > > super();
> > > > }
> > > >
> > > > public Metadata applyRule(String name, TagAttribute attribute,
> > > > MetadataTarget meta) {
> > > > if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
> > > >
> > > > if (ACTION_LISTENER_ATT_NAME.equals(name)) {
> > > > return new ActionListenerMapper(attribute);
> > > > }
> > > > }
> > > > return null;
> > > > }
> > > > }
> > > >
> > > > }
> > > >
> > > >
> > > > I hope this is basically the correct approach...
> > > >
> > > > Cheers,
> > > > Martin
> > > >
> > > >
> > > >
> > > > > Use one of these technologies:
> > > > >
> > > > > 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
> > > > >
> > > > > <page view-id="/index.xhtml"
> > > > > action="#{welcomeBean.onLoad}" />
> > > > >
> > > > > 2) On-load from jsf-comp:
> > > > > http://jsf-comp.sourceforge.net/components/onload/index.html
> > > > >
> > > > > 3) or use Shale (I have no experience with this one):
> > > > > http://shale.apache.org/shale-view/index.html
> > > > >
> > > > > -Andrew
> > > > >
> > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > > On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > > > > > Hello Martin,
> > > > > >
> > > > > > Can you provide a mopre explicit example of the use case
> > > > > please?
> > > > > Sorry for the few words, if you think about a problem for
> > > > > several days
> > > > > to you it seems just too clear ;)
> > > > >
> > > > > What I have is a datatable in a template with the detailStamp
> > > > > facet:
> > > > >
> > > > > <table jsfc="t:dataTable"
> > > > > ...
> > > > > value="#{myBean.myModel}"
> > > > > var="myItem"
> > > > > varDetailToggler="detailToggler">
> > > > >
> > > > > ... some columns ...
> > > > >
> > > > > <span jsfc="f:facet" name="detailStamp">
> > > > > <ui:include src=" itemdetails.xhtml">
> > > > > <ui:param name="item"
> > > > > value="#{myItem}"/>
> > > > > </ui:include>
> > > > > </span>
> > > > > </table>
> > > > >
> > > > > The itemdetails.xhtml displays details to the item, e.g. it
> > > > > iterates
> > > > > over some detail options like the following:
> > > > >
> > > > > <ui:repeat var="option" value="#{item.myOptions}">
> > > > > #{option.description}
> > > > > </ui:repeat>
> > > > >
> > > > > So the the myBean.myModel.myOptions method is requested when
> > > > > the detailStamp
> > > > > is displayed for one item, this method is invoked when
> > > > > rendering happens.
> > > > >
> > > > > When myBean.myModel.myOptions is invoked the first time, I do
> > > > > some lazy
> > > > > initialization, this might cause errors...
> > > > >
> > > > > I do not see how I could do the processing in the invoke
> > > > > application, because
> > > > > the detailStamp is shown via HtmlDataTable.toggleDetail, which
> > > > > is invoked
> > > > > during invoke-application, but there's no possibility of
> > > > > specifying a listener
> > > > > that is invoked when toggleDetail is invoked...
> > > > >
> > > > > I hope this clarifies the problem a little bit, if s.th. is
> > > > > missing please
> > > > > let me know!
> > > > >
> > > > > Thanx a lot,
> > > > > cheers,
> > > > > Martin
> > > > >
> > > > >
> > > > >
> > > > > > Why can't you do the processing in the invoke application
> > > > > phase?
> > > > > > Without more details, all I could suggest is to use a render
> > > > > response
> > > > > > phase listener and add your logic in the beforePhase
> > > > > method.
> > > > > >
> > > > > >
> > > > > > Regards,
> > > > > >
> > > > > > ~ Simon
> > > > > >
> > > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> > > > > wrote:
> > > > > > Hi all,
> > > > > >
> > > > > > I have a case where I perform some logic during the
> > > > > > RENDER_RESPONSE
> > > > > > phase where an error might occurs and I want to
> > > > > display some
> > > > > > error
> > > > > > message - which is unfortunately not displayed
> > > > > directly. But
> > > > > > with the
> > > > > > next request/response the error message is
> > > > > displayed. I asume
> > > > > > that this
> > > > > > is the case because the h:messages component is
> > > > > already
> > > > > > rendered - so
> > > > > > the behavior should basically be correct.
> > > > > >
> > > > > > Do you have any suggestions how to handle this?
> > > > > >
> > > > > > The concrete case is when the details of a dataTable
> > > > > (facet
> > > > > > detailStamp)
> > > > > > are displayed - just comes into my mind to use a
> > > > > > CustomHtmlDataTable
> > > > > > component that overrides the toggleDetail method...
> > > > > What do
> > > > > > you think?
> > > > > >
> > > > > > Thanx in advance,
> > > > > > cheers,
> > > > > > Martin
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > --
> > > > > Martin Grotzke
> > > > > http://www.javakaffee.de/blog/
> > > > >
> > > > >
> > > > >
> > > --
> > > Martin Grotzke
> > > http://www.javakaffee.de/blog/
> > >
> > >
> > >
> >
> --
> Martin Grotzke
> http://www.javakaffee.de/blog/
>
>
>
Re: How to handle/display errors during render response
Posted by Martin Grotzke <ma...@javakaffee.de>.
Hello Mike,
On Mon, 2006-12-11 at 15:37 -0500, Mike Kienenberger wrote:
> I think you made the facelets tag handler harder that necessary. Not
> sure about the "void.class" syntax below, but you can probably figure
> out the correct syntax.
Thanx a lot, this is a great simplification! (and the void.class is
correct :))
I wrote the tag handler according to what I've seen in the facelets
sources, knew (read) nothing about MethodRule :)
Thanx again,
cheers,
Martin
>
>
> private static final String ACTION_LISTENER_ATT_NAME =
> "toggleDetailActionListener";
>
> public final static Class[] ACTION_LISTENER_SIG = new Class[] {
> ActionEvent.class };
> protected final static MethodRule actionListenerTagRule
> = new MethodRule(ACTION_LISTENER_ATT_NAME, void.class,
> ACTION_LISTENER_SIG);
>
> public CustomHtmlDataTableHandler(ComponentConfig config) {
> super( config );
> }
>
> protected MetaRuleset createMetaRuleset(Class type)
> {
> MetaRuleset m = super.createMetaRuleset(type);
>
> m.addRule(actionListenerTagRule);
>
> return m;
> }
>
> On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > On Mon, 2006-12-11 at 20:37 +0100, Martin Grotzke wrote:
> > > On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> > > > "When myBean.myModel.myOptions is invoked the first time, I do some
> > > > lazy
> > > > initialization, this might cause errors..."
> > > >
> > > > I would recommend that you load this data in the on load method of
> > > > your page. This way, if it fails, you can handle the error in any way
> > > > you want, including redirecting to an error page.
> > > I cannot do this, because I have to initialize the detailStamps of
> > > all rows separately: the details of one item cause several backend
> > > requests that might cost money, and they definitively need time
> > > to return (several seconds per request).
> > >
> > > Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
> > > provides an additional MethodBinding "toggleDetailActionListener".
> >
> > Btw, I just posted the complete example here:
> > http://www.javakaffee.de/blog/2006/12/11/how-to-add-a-new-attribute-to-an-existing-jsf-component-using-facelets/
> >
> > Perhaps it's useful for someone...
> >
> > Cheers,
> > Martin
> >
> >
> > >
> > >
> > > The toggleDetail method is extended so that it invokes also the method
> > > binding if it's provided.
> > >
> > > The hardest thing was to write the facelets MetaTagHandler that sets
> > > the attribute on the CustomHtmlDataTable:
> > >
> > > public final class CustomHtmlDataTableHandler extends ComponentHandler {
> > >
> > > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > > super( config );
> > > }
> > >
> > > protected MetaRuleset createMetaRuleset(Class type) {
> > > return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
> > > }
> > >
> > > static final class ActionSourceRule extends MetaRule {
> > >
> > > private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
> > >
> > > public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
> > >
> > > final static class ActionListenerMapper extends Metadata {
> > >
> > > private final TagAttribute attr;
> > >
> > > public ActionListenerMapper(TagAttribute attr) {
> > > this.attr = attr;
> > > }
> > >
> > > public void applyMetadata(FaceletContext ctx, Object instance) {
> > > ((CustomHtmlDataTable) instance)
> > > .setToggleDetailActionListener( new LegacyMethodBinding(this.attr
> > > .getMethodExpression(ctx, null,
> > > ActionSourceRule.ACTION_LISTENER_SIG)));
> > > }
> > >
> > > }
> > >
> > > public final static ActionSourceRule Instance = new ActionSourceRule();
> > >
> > > public ActionSourceRule() {
> > > super();
> > > }
> > >
> > > public Metadata applyRule(String name, TagAttribute attribute,
> > > MetadataTarget meta) {
> > > if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
> > >
> > > if (ACTION_LISTENER_ATT_NAME.equals(name)) {
> > > return new ActionListenerMapper(attribute);
> > > }
> > > }
> > > return null;
> > > }
> > > }
> > >
> > > }
> > >
> > >
> > > I hope this is basically the correct approach...
> > >
> > > Cheers,
> > > Martin
> > >
> > >
> > >
> > > > Use one of these technologies:
> > > >
> > > > 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
> > > >
> > > > <page view-id="/index.xhtml"
> > > > action="#{welcomeBean.onLoad}" />
> > > >
> > > > 2) On-load from jsf-comp:
> > > > http://jsf-comp.sourceforge.net/components/onload/index.html
> > > >
> > > > 3) or use Shale (I have no experience with this one):
> > > > http://shale.apache.org/shale-view/index.html
> > > >
> > > > -Andrew
> > > >
> > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > > On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > > > > Hello Martin,
> > > > >
> > > > > Can you provide a mopre explicit example of the use case
> > > > please?
> > > > Sorry for the few words, if you think about a problem for
> > > > several days
> > > > to you it seems just too clear ;)
> > > >
> > > > What I have is a datatable in a template with the detailStamp
> > > > facet:
> > > >
> > > > <table jsfc="t:dataTable"
> > > > ...
> > > > value="#{myBean.myModel}"
> > > > var="myItem"
> > > > varDetailToggler="detailToggler">
> > > >
> > > > ... some columns ...
> > > >
> > > > <span jsfc="f:facet" name="detailStamp">
> > > > <ui:include src=" itemdetails.xhtml">
> > > > <ui:param name="item"
> > > > value="#{myItem}"/>
> > > > </ui:include>
> > > > </span>
> > > > </table>
> > > >
> > > > The itemdetails.xhtml displays details to the item, e.g. it
> > > > iterates
> > > > over some detail options like the following:
> > > >
> > > > <ui:repeat var="option" value="#{item.myOptions}">
> > > > #{option.description}
> > > > </ui:repeat>
> > > >
> > > > So the the myBean.myModel.myOptions method is requested when
> > > > the detailStamp
> > > > is displayed for one item, this method is invoked when
> > > > rendering happens.
> > > >
> > > > When myBean.myModel.myOptions is invoked the first time, I do
> > > > some lazy
> > > > initialization, this might cause errors...
> > > >
> > > > I do not see how I could do the processing in the invoke
> > > > application, because
> > > > the detailStamp is shown via HtmlDataTable.toggleDetail, which
> > > > is invoked
> > > > during invoke-application, but there's no possibility of
> > > > specifying a listener
> > > > that is invoked when toggleDetail is invoked...
> > > >
> > > > I hope this clarifies the problem a little bit, if s.th. is
> > > > missing please
> > > > let me know!
> > > >
> > > > Thanx a lot,
> > > > cheers,
> > > > Martin
> > > >
> > > >
> > > >
> > > > > Why can't you do the processing in the invoke application
> > > > phase?
> > > > > Without more details, all I could suggest is to use a render
> > > > response
> > > > > phase listener and add your logic in the beforePhase
> > > > method.
> > > > >
> > > > >
> > > > > Regards,
> > > > >
> > > > > ~ Simon
> > > > >
> > > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> > > > wrote:
> > > > > Hi all,
> > > > >
> > > > > I have a case where I perform some logic during the
> > > > > RENDER_RESPONSE
> > > > > phase where an error might occurs and I want to
> > > > display some
> > > > > error
> > > > > message - which is unfortunately not displayed
> > > > directly. But
> > > > > with the
> > > > > next request/response the error message is
> > > > displayed. I asume
> > > > > that this
> > > > > is the case because the h:messages component is
> > > > already
> > > > > rendered - so
> > > > > the behavior should basically be correct.
> > > > >
> > > > > Do you have any suggestions how to handle this?
> > > > >
> > > > > The concrete case is when the details of a dataTable
> > > > (facet
> > > > > detailStamp)
> > > > > are displayed - just comes into my mind to use a
> > > > > CustomHtmlDataTable
> > > > > component that overrides the toggleDetail method...
> > > > What do
> > > > > you think?
> > > > >
> > > > > Thanx in advance,
> > > > > cheers,
> > > > > Martin
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > --
> > > > Martin Grotzke
> > > > http://www.javakaffee.de/blog/
> > > >
> > > >
> > > >
> > --
> > Martin Grotzke
> > http://www.javakaffee.de/blog/
> >
> >
> >
>
--
Martin Grotzke
http://www.javakaffee.de/blog/
Re: How to handle/display errors during render response
Posted by Mike Kienenberger <mk...@gmail.com>.
I think you made the facelets tag handler harder that necessary. Not
sure about the "void.class" syntax below, but you can probably figure
out the correct syntax.
private static final String ACTION_LISTENER_ATT_NAME =
"toggleDetailActionListener";
public final static Class[] ACTION_LISTENER_SIG = new Class[] {
ActionEvent.class };
protected final static MethodRule actionListenerTagRule
= new MethodRule(ACTION_LISTENER_ATT_NAME, void.class,
ACTION_LISTENER_SIG);
public CustomHtmlDataTableHandler(ComponentConfig config) {
super( config );
}
protected MetaRuleset createMetaRuleset(Class type)
{
MetaRuleset m = super.createMetaRuleset(type);
m.addRule(actionListenerTagRule);
return m;
}
On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> On Mon, 2006-12-11 at 20:37 +0100, Martin Grotzke wrote:
> > On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> > > "When myBean.myModel.myOptions is invoked the first time, I do some
> > > lazy
> > > initialization, this might cause errors..."
> > >
> > > I would recommend that you load this data in the on load method of
> > > your page. This way, if it fails, you can handle the error in any way
> > > you want, including redirecting to an error page.
> > I cannot do this, because I have to initialize the detailStamps of
> > all rows separately: the details of one item cause several backend
> > requests that might cost money, and they definitively need time
> > to return (several seconds per request).
> >
> > Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
> > provides an additional MethodBinding "toggleDetailActionListener".
>
> Btw, I just posted the complete example here:
> http://www.javakaffee.de/blog/2006/12/11/how-to-add-a-new-attribute-to-an-existing-jsf-component-using-facelets/
>
> Perhaps it's useful for someone...
>
> Cheers,
> Martin
>
>
> >
> >
> > The toggleDetail method is extended so that it invokes also the method
> > binding if it's provided.
> >
> > The hardest thing was to write the facelets MetaTagHandler that sets
> > the attribute on the CustomHtmlDataTable:
> >
> > public final class CustomHtmlDataTableHandler extends ComponentHandler {
> >
> > public CustomHtmlDataTableHandler(ComponentConfig config) {
> > super( config );
> > }
> >
> > protected MetaRuleset createMetaRuleset(Class type) {
> > return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
> > }
> >
> > static final class ActionSourceRule extends MetaRule {
> >
> > private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
> >
> > public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
> >
> > final static class ActionListenerMapper extends Metadata {
> >
> > private final TagAttribute attr;
> >
> > public ActionListenerMapper(TagAttribute attr) {
> > this.attr = attr;
> > }
> >
> > public void applyMetadata(FaceletContext ctx, Object instance) {
> > ((CustomHtmlDataTable) instance)
> > .setToggleDetailActionListener( new LegacyMethodBinding(this.attr
> > .getMethodExpression(ctx, null,
> > ActionSourceRule.ACTION_LISTENER_SIG)));
> > }
> >
> > }
> >
> > public final static ActionSourceRule Instance = new ActionSourceRule();
> >
> > public ActionSourceRule() {
> > super();
> > }
> >
> > public Metadata applyRule(String name, TagAttribute attribute,
> > MetadataTarget meta) {
> > if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
> >
> > if (ACTION_LISTENER_ATT_NAME.equals(name)) {
> > return new ActionListenerMapper(attribute);
> > }
> > }
> > return null;
> > }
> > }
> >
> > }
> >
> >
> > I hope this is basically the correct approach...
> >
> > Cheers,
> > Martin
> >
> >
> >
> > > Use one of these technologies:
> > >
> > > 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
> > >
> > > <page view-id="/index.xhtml"
> > > action="#{welcomeBean.onLoad}" />
> > >
> > > 2) On-load from jsf-comp:
> > > http://jsf-comp.sourceforge.net/components/onload/index.html
> > >
> > > 3) or use Shale (I have no experience with this one):
> > > http://shale.apache.org/shale-view/index.html
> > >
> > > -Andrew
> > >
> > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > > On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > > > Hello Martin,
> > > >
> > > > Can you provide a mopre explicit example of the use case
> > > please?
> > > Sorry for the few words, if you think about a problem for
> > > several days
> > > to you it seems just too clear ;)
> > >
> > > What I have is a datatable in a template with the detailStamp
> > > facet:
> > >
> > > <table jsfc="t:dataTable"
> > > ...
> > > value="#{myBean.myModel}"
> > > var="myItem"
> > > varDetailToggler="detailToggler">
> > >
> > > ... some columns ...
> > >
> > > <span jsfc="f:facet" name="detailStamp">
> > > <ui:include src=" itemdetails.xhtml">
> > > <ui:param name="item"
> > > value="#{myItem}"/>
> > > </ui:include>
> > > </span>
> > > </table>
> > >
> > > The itemdetails.xhtml displays details to the item, e.g. it
> > > iterates
> > > over some detail options like the following:
> > >
> > > <ui:repeat var="option" value="#{item.myOptions}">
> > > #{option.description}
> > > </ui:repeat>
> > >
> > > So the the myBean.myModel.myOptions method is requested when
> > > the detailStamp
> > > is displayed for one item, this method is invoked when
> > > rendering happens.
> > >
> > > When myBean.myModel.myOptions is invoked the first time, I do
> > > some lazy
> > > initialization, this might cause errors...
> > >
> > > I do not see how I could do the processing in the invoke
> > > application, because
> > > the detailStamp is shown via HtmlDataTable.toggleDetail, which
> > > is invoked
> > > during invoke-application, but there's no possibility of
> > > specifying a listener
> > > that is invoked when toggleDetail is invoked...
> > >
> > > I hope this clarifies the problem a little bit, if s.th. is
> > > missing please
> > > let me know!
> > >
> > > Thanx a lot,
> > > cheers,
> > > Martin
> > >
> > >
> > >
> > > > Why can't you do the processing in the invoke application
> > > phase?
> > > > Without more details, all I could suggest is to use a render
> > > response
> > > > phase listener and add your logic in the beforePhase
> > > method.
> > > >
> > > >
> > > > Regards,
> > > >
> > > > ~ Simon
> > > >
> > > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> > > wrote:
> > > > Hi all,
> > > >
> > > > I have a case where I perform some logic during the
> > > > RENDER_RESPONSE
> > > > phase where an error might occurs and I want to
> > > display some
> > > > error
> > > > message - which is unfortunately not displayed
> > > directly. But
> > > > with the
> > > > next request/response the error message is
> > > displayed. I asume
> > > > that this
> > > > is the case because the h:messages component is
> > > already
> > > > rendered - so
> > > > the behavior should basically be correct.
> > > >
> > > > Do you have any suggestions how to handle this?
> > > >
> > > > The concrete case is when the details of a dataTable
> > > (facet
> > > > detailStamp)
> > > > are displayed - just comes into my mind to use a
> > > > CustomHtmlDataTable
> > > > component that overrides the toggleDetail method...
> > > What do
> > > > you think?
> > > >
> > > > Thanx in advance,
> > > > cheers,
> > > > Martin
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > --
> > > Martin Grotzke
> > > http://www.javakaffee.de/blog/
> > >
> > >
> > >
> --
> Martin Grotzke
> http://www.javakaffee.de/blog/
>
>
>
Re: How to handle/display errors during render response
Posted by Martin Grotzke <ma...@javakaffee.de>.
On Mon, 2006-12-11 at 20:37 +0100, Martin Grotzke wrote:
> On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> > "When myBean.myModel.myOptions is invoked the first time, I do some
> > lazy
> > initialization, this might cause errors..."
> >
> > I would recommend that you load this data in the on load method of
> > your page. This way, if it fails, you can handle the error in any way
> > you want, including redirecting to an error page.
> I cannot do this, because I have to initialize the detailStamps of
> all rows separately: the details of one item cause several backend
> requests that might cost money, and they definitively need time
> to return (several seconds per request).
>
> Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
> provides an additional MethodBinding "toggleDetailActionListener".
Btw, I just posted the complete example here:
http://www.javakaffee.de/blog/2006/12/11/how-to-add-a-new-attribute-to-an-existing-jsf-component-using-facelets/
Perhaps it's useful for someone...
Cheers,
Martin
>
>
> The toggleDetail method is extended so that it invokes also the method
> binding if it's provided.
>
> The hardest thing was to write the facelets MetaTagHandler that sets
> the attribute on the CustomHtmlDataTable:
>
> public final class CustomHtmlDataTableHandler extends ComponentHandler {
>
> public CustomHtmlDataTableHandler(ComponentConfig config) {
> super( config );
> }
>
> protected MetaRuleset createMetaRuleset(Class type) {
> return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
> }
>
> static final class ActionSourceRule extends MetaRule {
>
> private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
>
> public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
>
> final static class ActionListenerMapper extends Metadata {
>
> private final TagAttribute attr;
>
> public ActionListenerMapper(TagAttribute attr) {
> this.attr = attr;
> }
>
> public void applyMetadata(FaceletContext ctx, Object instance) {
> ((CustomHtmlDataTable) instance)
> .setToggleDetailActionListener( new LegacyMethodBinding(this.attr
> .getMethodExpression(ctx, null,
> ActionSourceRule.ACTION_LISTENER_SIG)));
> }
>
> }
>
> public final static ActionSourceRule Instance = new ActionSourceRule();
>
> public ActionSourceRule() {
> super();
> }
>
> public Metadata applyRule(String name, TagAttribute attribute,
> MetadataTarget meta) {
> if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
>
> if (ACTION_LISTENER_ATT_NAME.equals(name)) {
> return new ActionListenerMapper(attribute);
> }
> }
> return null;
> }
> }
>
> }
>
>
> I hope this is basically the correct approach...
>
> Cheers,
> Martin
>
>
>
> > Use one of these technologies:
> >
> > 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
> >
> > <page view-id="/index.xhtml"
> > action="#{welcomeBean.onLoad}" />
> >
> > 2) On-load from jsf-comp:
> > http://jsf-comp.sourceforge.net/components/onload/index.html
> >
> > 3) or use Shale (I have no experience with this one):
> > http://shale.apache.org/shale-view/index.html
> >
> > -Andrew
> >
> > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > > Hello Martin,
> > >
> > > Can you provide a mopre explicit example of the use case
> > please?
> > Sorry for the few words, if you think about a problem for
> > several days
> > to you it seems just too clear ;)
> >
> > What I have is a datatable in a template with the detailStamp
> > facet:
> >
> > <table jsfc="t:dataTable"
> > ...
> > value="#{myBean.myModel}"
> > var="myItem"
> > varDetailToggler="detailToggler">
> >
> > ... some columns ...
> >
> > <span jsfc="f:facet" name="detailStamp">
> > <ui:include src=" itemdetails.xhtml">
> > <ui:param name="item"
> > value="#{myItem}"/>
> > </ui:include>
> > </span>
> > </table>
> >
> > The itemdetails.xhtml displays details to the item, e.g. it
> > iterates
> > over some detail options like the following:
> >
> > <ui:repeat var="option" value="#{item.myOptions}">
> > #{option.description}
> > </ui:repeat>
> >
> > So the the myBean.myModel.myOptions method is requested when
> > the detailStamp
> > is displayed for one item, this method is invoked when
> > rendering happens.
> >
> > When myBean.myModel.myOptions is invoked the first time, I do
> > some lazy
> > initialization, this might cause errors...
> >
> > I do not see how I could do the processing in the invoke
> > application, because
> > the detailStamp is shown via HtmlDataTable.toggleDetail, which
> > is invoked
> > during invoke-application, but there's no possibility of
> > specifying a listener
> > that is invoked when toggleDetail is invoked...
> >
> > I hope this clarifies the problem a little bit, if s.th. is
> > missing please
> > let me know!
> >
> > Thanx a lot,
> > cheers,
> > Martin
> >
> >
> >
> > > Why can't you do the processing in the invoke application
> > phase?
> > > Without more details, all I could suggest is to use a render
> > response
> > > phase listener and add your logic in the beforePhase
> > method.
> > >
> > >
> > > Regards,
> > >
> > > ~ Simon
> > >
> > > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> > wrote:
> > > Hi all,
> > >
> > > I have a case where I perform some logic during the
> > > RENDER_RESPONSE
> > > phase where an error might occurs and I want to
> > display some
> > > error
> > > message - which is unfortunately not displayed
> > directly. But
> > > with the
> > > next request/response the error message is
> > displayed. I asume
> > > that this
> > > is the case because the h:messages component is
> > already
> > > rendered - so
> > > the behavior should basically be correct.
> > >
> > > Do you have any suggestions how to handle this?
> > >
> > > The concrete case is when the details of a dataTable
> > (facet
> > > detailStamp)
> > > are displayed - just comes into my mind to use a
> > > CustomHtmlDataTable
> > > component that overrides the toggleDetail method...
> > What do
> > > you think?
> > >
> > > Thanx in advance,
> > > cheers,
> > > Martin
> > >
> > >
> > >
> > >
> > >
> > >
> > --
> > Martin Grotzke
> > http://www.javakaffee.de/blog/
> >
> >
> >
--
Martin Grotzke
http://www.javakaffee.de/blog/
Re: How to handle/display errors during render response
Posted by Martin Grotzke <ma...@javakaffee.de>.
On Mon, 2006-12-11 at 09:44 -0700, Andrew Robinson wrote:
> "When myBean.myModel.myOptions is invoked the first time, I do some
> lazy
> initialization, this might cause errors..."
>
> I would recommend that you load this data in the on load method of
> your page. This way, if it fails, you can handle the error in any way
> you want, including redirecting to an error page.
I cannot do this, because I have to initialize the detailStamps of
all rows separately: the details of one item cause several backend
requests that might cost money, and they definitively need time
to return (several seconds per request).
Now I wrote a CustomHtmlDataTable (extending HtmlDataTable) that
provides an additional MethodBinding "toggleDetailActionListener".
The toggleDetail method is extended so that it invokes also the method
binding if it's provided.
The hardest thing was to write the facelets MetaTagHandler that sets
the attribute on the CustomHtmlDataTable:
public final class CustomHtmlDataTableHandler extends ComponentHandler {
public CustomHtmlDataTableHandler(ComponentConfig config) {
super( config );
}
protected MetaRuleset createMetaRuleset(Class type) {
return super.createMetaRuleset(type).addRule( ActionSourceRule.Instance );
}
static final class ActionSourceRule extends MetaRule {
private static final String ACTION_LISTENER_ATT_NAME = "toggleDetailActionListener";
public final static Class[] ACTION_LISTENER_SIG = new Class[] { ActionEvent.class };
final static class ActionListenerMapper extends Metadata {
private final TagAttribute attr;
public ActionListenerMapper(TagAttribute attr) {
this.attr = attr;
}
public void applyMetadata(FaceletContext ctx, Object instance) {
((CustomHtmlDataTable) instance)
.setToggleDetailActionListener( new LegacyMethodBinding(this.attr
.getMethodExpression(ctx, null,
ActionSourceRule.ACTION_LISTENER_SIG)));
}
}
public final static ActionSourceRule Instance = new ActionSourceRule();
public ActionSourceRule() {
super();
}
public Metadata applyRule(String name, TagAttribute attribute,
MetadataTarget meta) {
if (meta.isTargetInstanceOf(CustomHtmlDataTable.class)) {
if (ACTION_LISTENER_ATT_NAME.equals(name)) {
return new ActionListenerMapper(attribute);
}
}
return null;
}
}
}
I hope this is basically the correct approach...
Cheers,
Martin
> Use one of these technologies:
>
> 1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
>
> <page view-id="/index.xhtml"
> action="#{welcomeBean.onLoad}" />
>
> 2) On-load from jsf-comp:
> http://jsf-comp.sourceforge.net/components/onload/index.html
>
> 3) or use Shale (I have no experience with this one):
> http://shale.apache.org/shale-view/index.html
>
> -Andrew
>
> On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > Hello Martin,
> >
> > Can you provide a mopre explicit example of the use case
> please?
> Sorry for the few words, if you think about a problem for
> several days
> to you it seems just too clear ;)
>
> What I have is a datatable in a template with the detailStamp
> facet:
>
> <table jsfc="t:dataTable"
> ...
> value="#{myBean.myModel}"
> var="myItem"
> varDetailToggler="detailToggler">
>
> ... some columns ...
>
> <span jsfc="f:facet" name="detailStamp">
> <ui:include src=" itemdetails.xhtml">
> <ui:param name="item"
> value="#{myItem}"/>
> </ui:include>
> </span>
> </table>
>
> The itemdetails.xhtml displays details to the item, e.g. it
> iterates
> over some detail options like the following:
>
> <ui:repeat var="option" value="#{item.myOptions}">
> #{option.description}
> </ui:repeat>
>
> So the the myBean.myModel.myOptions method is requested when
> the detailStamp
> is displayed for one item, this method is invoked when
> rendering happens.
>
> When myBean.myModel.myOptions is invoked the first time, I do
> some lazy
> initialization, this might cause errors...
>
> I do not see how I could do the processing in the invoke
> application, because
> the detailStamp is shown via HtmlDataTable.toggleDetail, which
> is invoked
> during invoke-application, but there's no possibility of
> specifying a listener
> that is invoked when toggleDetail is invoked...
>
> I hope this clarifies the problem a little bit, if s.th. is
> missing please
> let me know!
>
> Thanx a lot,
> cheers,
> Martin
>
>
>
> > Why can't you do the processing in the invoke application
> phase?
> > Without more details, all I could suggest is to use a render
> response
> > phase listener and add your logic in the beforePhase
> method.
> >
> >
> > Regards,
> >
> > ~ Simon
> >
> > On 12/11/06, Martin Grotzke <ma...@javakaffee.de>
> wrote:
> > Hi all,
> >
> > I have a case where I perform some logic during the
> > RENDER_RESPONSE
> > phase where an error might occurs and I want to
> display some
> > error
> > message - which is unfortunately not displayed
> directly. But
> > with the
> > next request/response the error message is
> displayed. I asume
> > that this
> > is the case because the h:messages component is
> already
> > rendered - so
> > the behavior should basically be correct.
> >
> > Do you have any suggestions how to handle this?
> >
> > The concrete case is when the details of a dataTable
> (facet
> > detailStamp)
> > are displayed - just comes into my mind to use a
> > CustomHtmlDataTable
> > component that overrides the toggleDetail method...
> What do
> > you think?
> >
> > Thanx in advance,
> > cheers,
> > Martin
> >
> >
> >
> >
> >
> >
> --
> Martin Grotzke
> http://www.javakaffee.de/blog/
>
>
>
--
Martin Grotzke
http://www.javakaffee.de/blog/
Re: How to handle/display errors during render response
Posted by Andrew Robinson <an...@gmail.com>.
"When myBean.myModel.myOptions is invoked the first time, I do some lazy
initialization, this might cause errors..."
I would recommend that you load this data in the on load method of your
page. This way, if it fails, you can handle the error in any way you want,
including redirecting to an error page. Use one of these technologies:
1) JBoss-Seam. Set the action to run in the pages.xml file. Example:
<page view-id="/index.xhtml"
action="#{welcomeBean.onLoad}" />
2) On-load from jsf-comp:
http://jsf-comp.sourceforge.net/components/onload/index.html
3) or use Shale (I have no experience with this one):
http://shale.apache.org/shale-view/index.html
-Andrew
On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
>
> On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> > Hello Martin,
> >
> > Can you provide a mopre explicit example of the use case please?
> Sorry for the few words, if you think about a problem for several days
> to you it seems just too clear ;)
>
> What I have is a datatable in a template with the detailStamp facet:
>
> <table jsfc="t:dataTable"
> ...
> value="#{myBean.myModel}"
> var="myItem"
> varDetailToggler="detailToggler">
>
> ... some columns ...
>
> <span jsfc="f:facet" name="detailStamp">
> <ui:include src="itemdetails.xhtml">
> <ui:param name="item" value="#{myItem}"/>
> </ui:include>
> </span>
> </table>
>
> The itemdetails.xhtml displays details to the item, e.g. it iterates
> over some detail options like the following:
>
> <ui:repeat var="option" value="#{item.myOptions}">
> #{option.description}
> </ui:repeat>
>
> So the the myBean.myModel.myOptions method is requested when the
> detailStamp
> is displayed for one item, this method is invoked when rendering happens.
>
> When myBean.myModel.myOptions is invoked the first time, I do some lazy
> initialization, this might cause errors...
>
> I do not see how I could do the processing in the invoke application,
> because
> the detailStamp is shown via HtmlDataTable.toggleDetail, which is invoked
> during invoke-application, but there's no possibility of specifying a
> listener
> that is invoked when toggleDetail is invoked...
>
> I hope this clarifies the problem a little bit, if s.th. is missing please
> let me know!
>
> Thanx a lot,
> cheers,
> Martin
>
>
>
> > Why can't you do the processing in the invoke application phase?
> > Without more details, all I could suggest is to use a render response
> > phase listener and add your logic in the beforePhase method.
> >
> >
> > Regards,
> >
> > ~ Simon
> >
> > On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> > Hi all,
> >
> > I have a case where I perform some logic during the
> > RENDER_RESPONSE
> > phase where an error might occurs and I want to display some
> > error
> > message - which is unfortunately not displayed directly. But
> > with the
> > next request/response the error message is displayed. I asume
> > that this
> > is the case because the h:messages component is already
> > rendered - so
> > the behavior should basically be correct.
> >
> > Do you have any suggestions how to handle this?
> >
> > The concrete case is when the details of a dataTable (facet
> > detailStamp)
> > are displayed - just comes into my mind to use a
> > CustomHtmlDataTable
> > component that overrides the toggleDetail method... What do
> > you think?
> >
> > Thanx in advance,
> > cheers,
> > Martin
> >
> >
> >
> >
> >
> >
> --
> Martin Grotzke
> http://www.javakaffee.de/blog/
>
>
>
Re: How to handle/display errors during render response
Posted by Martin Grotzke <ma...@javakaffee.de>.
On Mon, 2006-12-11 at 10:29 -0500, Simon Lessard wrote:
> Hello Martin,
>
> Can you provide a mopre explicit example of the use case please?
Sorry for the few words, if you think about a problem for several days
to you it seems just too clear ;)
What I have is a datatable in a template with the detailStamp facet:
<table jsfc="t:dataTable"
...
value="#{myBean.myModel}"
var="myItem"
varDetailToggler="detailToggler">
... some columns ...
<span jsfc="f:facet" name="detailStamp">
<ui:include src="itemdetails.xhtml">
<ui:param name="item" value="#{myItem}"/>
</ui:include>
</span>
</table>
The itemdetails.xhtml displays details to the item, e.g. it iterates
over some detail options like the following:
<ui:repeat var="option" value="#{item.myOptions}">
#{option.description}
</ui:repeat>
So the the myBean.myModel.myOptions method is requested when the detailStamp
is displayed for one item, this method is invoked when rendering happens.
When myBean.myModel.myOptions is invoked the first time, I do some lazy
initialization, this might cause errors...
I do not see how I could do the processing in the invoke application, because
the detailStamp is shown via HtmlDataTable.toggleDetail, which is invoked
during invoke-application, but there's no possibility of specifying a listener
that is invoked when toggleDetail is invoked...
I hope this clarifies the problem a little bit, if s.th. is missing please
let me know!
Thanx a lot,
cheers,
Martin
> Why can't you do the processing in the invoke application phase?
> Without more details, all I could suggest is to use a render response
> phase listener and add your logic in the beforePhase method.
>
>
> Regards,
>
> ~ Simon
>
> On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> Hi all,
>
> I have a case where I perform some logic during the
> RENDER_RESPONSE
> phase where an error might occurs and I want to display some
> error
> message - which is unfortunately not displayed directly. But
> with the
> next request/response the error message is displayed. I asume
> that this
> is the case because the h:messages component is already
> rendered - so
> the behavior should basically be correct.
>
> Do you have any suggestions how to handle this?
>
> The concrete case is when the details of a dataTable (facet
> detailStamp)
> are displayed - just comes into my mind to use a
> CustomHtmlDataTable
> component that overrides the toggleDetail method... What do
> you think?
>
> Thanx in advance,
> cheers,
> Martin
>
>
>
>
>
>
--
Martin Grotzke
http://www.javakaffee.de/blog/
Re: How to handle/display errors during render response
Posted by Simon Lessard <si...@gmail.com>.
Hello Martin,
Can you provide a mopre explicit example of the use case please? Why can't
you do the processing in the invoke application phase? Without more details,
all I could suggest is to use a render response phase listener and add your
logic in the beforePhase method.
Regards,
~ Simon
On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
>
> Hi all,
>
> I have a case where I perform some logic during the RENDER_RESPONSE
> phase where an error might occurs and I want to display some error
> message - which is unfortunately not displayed directly. But with the
> next request/response the error message is displayed. I asume that this
> is the case because the h:messages component is already rendered - so
> the behavior should basically be correct.
>
> Do you have any suggestions how to handle this?
>
> The concrete case is when the details of a dataTable (facet detailStamp)
> are displayed - just comes into my mind to use a CustomHtmlDataTable
> component that overrides the toggleDetail method... What do you think?
>
> Thanx in advance,
> cheers,
> Martin
>
>
>
>
>
>
Re: How to handle/display errors during render response
Posted by Martin Grotzke <ma...@javakaffee.de>.
On Mon, 2006-12-11 at 09:17 -0700, Andrew Robinson wrote:
> It is not recommended to do any business logic code in the RENDER
> phase, keep all your code in the ACTION phase. Use shale or JBoss Seam
> or jsf-comp to execute any "on load" functionality of your page.
>
> If you must put your code in the render phase (like property getters),
> then you will need to put your messages component at the bottom of
> your page. Then use CSS to move it to wherever you want on the page.
Good idea, thanx!
Cheers,
Martin
>
> On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> Hi all,
>
> I have a case where I perform some logic during the
> RENDER_RESPONSE
> phase where an error might occurs and I want to display some
> error
> message - which is unfortunately not displayed directly. But
> with the
> next request/response the error message is displayed. I asume
> that this
> is the case because the h:messages component is already
> rendered - so
> the behavior should basically be correct.
>
> Do you have any suggestions how to handle this?
>
> The concrete case is when the details of a dataTable (facet
> detailStamp)
> are displayed - just comes into my mind to use a
> CustomHtmlDataTable
> component that overrides the toggleDetail method... What do
> you think?
>
> Thanx in advance,
> cheers,
> Martin
>
>
>
>
>
>
--
Martin Grotzke
http://www.javakaffee.de/blog/
Re: How to handle/display errors during render response
Posted by Simon Lessard <si...@gmail.com>.
I do not see how I could do the processing in the invoke application,
because
the detailStamp is shown via HtmlDataTable.toggleDetail, which is invoked
during invoke-application, but there's no possibility of specifying a
listener
that is invoked when toggleDetail is invoked...
Ok, that's the real problem. Well I see two "easy" solutions:
1. Uses Trinidad as it allows a listener on detailDisclosure
2. During invoke application, get an ExternalContext instance and go read
the request parameters to find out if a disclosure occured or not. It's more
a hack than a solution, but it should work.
Regards,
~ Simon
On 12/11/06, Andrew Robinson <an...@gmail.com> wrote:
>
> It is not recommended to do any business logic code in the RENDER phase,
> keep all your code in the ACTION phase. Use shale or JBoss Seam or jsf-comp
> to execute any "on load" functionality of your page.
>
> If you must put your code in the render phase (like property getters),
> then you will need to put your messages component at the bottom of your
> page. Then use CSS to move it to wherever you want on the page.
>
> On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
> >
> > Hi all,
> >
> > I have a case where I perform some logic during the RENDER_RESPONSE
> > phase where an error might occurs and I want to display some error
> > message - which is unfortunately not displayed directly. But with the
> > next request/response the error message is displayed. I asume that this
> > is the case because the h:messages component is already rendered - so
> > the behavior should basically be correct.
> >
> > Do you have any suggestions how to handle this?
> >
> > The concrete case is when the details of a dataTable (facet detailStamp)
> > are displayed - just comes into my mind to use a CustomHtmlDataTable
> > component that overrides the toggleDetail method... What do you think?
> >
> > Thanx in advance,
> > cheers,
> > Martin
> >
> >
> >
> >
> >
> >
>
Re: How to handle/display errors during render response
Posted by Andrew Robinson <an...@gmail.com>.
It is not recommended to do any business logic code in the RENDER phase,
keep all your code in the ACTION phase. Use shale or JBoss Seam or jsf-comp
to execute any "on load" functionality of your page.
If you must put your code in the render phase (like property getters), then
you will need to put your messages component at the bottom of your page.
Then use CSS to move it to wherever you want on the page.
On 12/11/06, Martin Grotzke <ma...@javakaffee.de> wrote:
>
> Hi all,
>
> I have a case where I perform some logic during the RENDER_RESPONSE
> phase where an error might occurs and I want to display some error
> message - which is unfortunately not displayed directly. But with the
> next request/response the error message is displayed. I asume that this
> is the case because the h:messages component is already rendered - so
> the behavior should basically be correct.
>
> Do you have any suggestions how to handle this?
>
> The concrete case is when the details of a dataTable (facet detailStamp)
> are displayed - just comes into my mind to use a CustomHtmlDataTable
> component that overrides the toggleDetail method... What do you think?
>
> Thanx in advance,
> cheers,
> Martin
>
>
>
>
>
>