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Posted to users@tapestry.apache.org by Bernard Sirius <be...@yahoo.com> on 2005/02/24 15:36:21 UTC
xml generation someone?
Hi,
I'm new to tapestry, having just done 1 or 2 tutes to
see how it works. Well, it's quite about what I need.
Really, I'm impressed. Only: I don't need to generate
HTML, only XML.
I'm using Laszlo for my current project. Already heard
of it? Well it's a RIA (Rich Internet Application)
platform currently targeting the flash player.
Laszlo has defined a specific xml language, along with
an ecmascript scripting language. Together they form a
very powerful mix to create GUIs. However, the whole
platform revolves arout the concept of data binding.
But here, the binding is done on the client, and the
data itself is XML.
And that's why I need to generate XML. On the other
end, a laszlo app still interacts with the client
using HTTP, sending request parameters, etc...
Well, I understand that a lot of what Tapestry does is
generate proper HTML markup. That I obviously won't
need. The interesting bits for me is the rest of
Tapestry: form validation and control flow
essentially.
Let me add that I know about cocoon, and I know I
don't want to use it here. Same thing about Spring:
I'm using it already. And I'll still use Spring, and
if I cannot take advantage of Tapestry, I'll stick to
it. But I'd really love to give a try at making things
easier for me.
So... has Tapestry already been used for that? Or am I
maybe completely wrong with the idea of using Tapestry
for XML generation ?
And, maybe that's something to ask to the devel-list:
looking at the source code, it seems like XML
generation is an upcoming feature. Maybe I could help
here, who knows...
bernard
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Re: Query on update within form
Posted by Nick Westgate <ni...@key-planning.co.jp>.
I had a similar situation with floors, rooms & beds of a rest home.
Floors and beds are drop-downs. This is how I did my initialisation:
(All the setX() functions are for persistent properties)
public abstract class BedsView extends BedControlPage implements
PageRenderListener
{
// ...
public void pageBeginRender(PageEvent event)
{
// initialize properties etc
if (!event.getRequestCycle().isRewinding())
{
// ...
if (getFloorSelectionModel() == null)
{
// this model is created only once
ArrayList floorList = getBedCache().getFloorStringList();
floorList.add(0, getMessage("selectAllString"));
setFloorSelectionModel(new FloorSelectionModel(floorList));
setFloor(getFloorSelectionModel().getValue(0));
setPreviousFloor(getFloor());
if (getRoomSelectionModel() == null)
{
setRoomSelectionModel(getNewRoomSelectionModel());
setRoom(getRoomSelectionModel().getValue(0));
}
}
// ...
Cheers,
Nick.
Derick Fernando wrote:
> Quoting sales <sa...@digiatlas.net>:
>
>
>>Anybody?
>>
>>
>>sales wrote:
>>
>>>My question is, where is it best to initialise things? Each list gets
>>>initialised in the model when the models are realised. However, I also
>>>need a way to initialise the page variables (county needs to be
>>>initialised to a real county ID value, not 0, in order for Place to be
>>>populated correctly from the database).
>
>
> Hi,
>
> Check the wiki for lazy initialization and the pageBeginRender method. You
> should implement the PageRenderListener and lazy initialize your variables
> there.
>
> ........................
> Derick Fernando
> Lead Architect
> TheLab, LLC
> http://www.thelabllc.com
>
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Re: Query on update within form
Posted by Derick Fernando <de...@thelabllc.com>.
Quoting sales <sa...@digiatlas.net>:
> Anybody?
>
>
> sales wrote:
> >
> >
> > I have a form with two drop-downs. The second of these (Place) gives a
> > list of place names which depend on the first drop-down (County). I
> > have county submit the form when the user selects something so that
> > Place gets populated with a new list of places.
> >
> > My question is, where is it best to initialise things? Each list gets
> > initialised in the model when the models are realised. However, I also
> > need a way to initialise the page variables (county needs to be
> > initialised to a real county ID value, not 0, in order for Place to be
> > populated correctly from the database).
> >
> > I have put the following for my accessors for the models:
> >
> >
> > public IPropertySelectionModel getPlaceModel()
> > {
> > if (placeModel == null)
> > {
> > placeModel = new PlaceModel();
> > }
> >
> > return placeModel;
> > }
> >
> >
> > public IPropertySelectionModel getCountyModel()
> > {
> > if (countyModel == null)
> > {
> > countyModel = new CountyModel();
> > setCounty(((Integer)countyModel.getOption(0)).intValue());
> > }
> >
> > return countyModel;
> > }
> >
> >
> > My callback to handle the form asks the Place model to re-fetch its data.
> >
> > But I'm not sure I'm really going about this the right way. It also
> > won't work unless I make the page properties, County and Place,
> > persistent. Obviously I only want to initialise County when the page is
> > first displayed to the user - subsequent submits and redisplays should
> > leave County as-is.
> >
> > dd
> >
> >
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> >
> >
>
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>
>
Hi,
Check the wiki for lazy initialization and the pageBeginRender method. You
should implement the PageRenderListener and lazy initialize your variables
there.
........................
Derick Fernando
Lead Architect
TheLab, LLC
http://www.thelabllc.com
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Re: Query on update within form
Posted by sales <sa...@digiatlas.net>.
Anybody?
sales wrote:
>
>
> I have a form with two drop-downs. The second of these (Place) gives a
> list of place names which depend on the first drop-down (County). I
> have county submit the form when the user selects something so that
> Place gets populated with a new list of places.
>
> My question is, where is it best to initialise things? Each list gets
> initialised in the model when the models are realised. However, I also
> need a way to initialise the page variables (county needs to be
> initialised to a real county ID value, not 0, in order for Place to be
> populated correctly from the database).
>
> I have put the following for my accessors for the models:
>
>
> public IPropertySelectionModel getPlaceModel()
> {
> if (placeModel == null)
> {
> placeModel = new PlaceModel();
> }
>
> return placeModel;
> }
>
>
> public IPropertySelectionModel getCountyModel()
> {
> if (countyModel == null)
> {
> countyModel = new CountyModel();
> setCounty(((Integer)countyModel.getOption(0)).intValue());
> }
>
> return countyModel;
> }
>
>
> My callback to handle the form asks the Place model to re-fetch its data.
>
> But I'm not sure I'm really going about this the right way. It also
> won't work unless I make the page properties, County and Place,
> persistent. Obviously I only want to initialise County when the page is
> first displayed to the user - subsequent submits and redisplays should
> leave County as-is.
>
> dd
>
>
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>
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Query on update within form
Posted by sales <sa...@digiatlas.net>.
I have a form with two drop-downs. The second of these (Place) gives a
list of place names which depend on the first drop-down (County). I
have county submit the form when the user selects something so that
Place gets populated with a new list of places.
My question is, where is it best to initialise things? Each list gets
initialised in the model when the models are realised. However, I also
need a way to initialise the page variables (county needs to be
initialised to a real county ID value, not 0, in order for Place to be
populated correctly from the database).
I have put the following for my accessors for the models:
public IPropertySelectionModel getPlaceModel()
{
if (placeModel == null)
{
placeModel = new PlaceModel();
}
return placeModel;
}
public IPropertySelectionModel getCountyModel()
{
if (countyModel == null)
{
countyModel = new CountyModel();
setCounty(((Integer)countyModel.getOption(0)).intValue());
}
return countyModel;
}
My callback to handle the form asks the Place model to re-fetch its data.
But I'm not sure I'm really going about this the right way. It also
won't work unless I make the page properties, County and Place,
persistent. Obviously I only want to initialise County when the page is
first displayed to the user - subsequent submits and redisplays should
leave County as-is.
dd
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CSV Renderer Link thingy.. CSV Component donation...
Posted by Joshua Long <lh...@adelphia.net>.
Hi guys
I am donating a CSV component if anyone wants it... when used, it allows
you to render a link that when clicked will return a CSV
(comma-seperated value) dump of a 2 dimensional array that you pass in.
Interesting sidebar: csv dumps whose first row, and first cell, contain
'ID' (without quotes, in capital letters) will cause Excel on OS X to
freak out and die. 'Id','id', all work fine..
ANYWAY!
I'll post it somewhere like Tacos eventually,but I'm sure it might stand
some improvement/feedback and I'm somewhat pressed for time.
I'm licensing it under the do-whatever-you-want-with-it-but-remember
your-old-pal-Josh-when-you-win-the-lottery-or-make-cool-changes-to-it
license.
Joshua Long
josh@joshlong.com
Code, documentation follow
to get it working int he application, of course, put the following in
the application specification
<service name="com.roartechnologies.ap.view.services.csv-service"
class="com.roartechnologies.ap.view.services.CSVService"/>
Anyway, here are the various cogs of the machine...
/// first the component class....
package com.roartechnologies.ap.view.components.csv;
import com.roartechnologies.ap.view.services.CSVService;
import org.apache.tapestry.AbstractComponent;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.Tapestry;
import org.apache.tapestry.engine.IEngineService;
import org.apache.tapestry.engine.ILink;
/**
* @author Joshua Long (josh@joshlong.com)
*
* Builds a request to our CSVService, which in turn
* does the heavy lifting of generating
* the actual dump.
*
* This follows a pretty standard idiom
* as set forth in <i>Tapestry In Action</i>
*
*/
public abstract class CSVComponent extends AbstractComponent {
public abstract Object getMap();
public abstract void setMap(Object mp);
public abstract Boolean getDisabled();
public abstract void setDisabled(Boolean mp);
protected void renderComponent(IMarkupWriter writer,
IRequestCycle cycle) {
if (cycle.isRewinding())
return;
Boolean disabled = getDisabled();
if (disabled != null) {
if (disabled.booleanValue()) {
writer.begin("span");
writer.attribute("class", "csv_disabled");
renderInformalParameters(writer, cycle);
writer.printRaw("CSV");
writer.end();
return ;
}
}
Object map = getMap();
if (null == map)
Tapestry.createRequiredParameterException(this, "map");
String key = Long.toString(System.currentTimeMillis());
cycle.getRequestContext().getSession().setAttribute(key, map);
IEngineService service =
cycle.getEngine().getService(CSVService.SERVICE_NAME);
ILink link = service.getLink(cycle, this, new Object[]{key});
String url = link.getURL();
writer.begin("a");
writer.attribute("class", "csv_enabled");
writer.attribute("href", url);
renderInformalParameters(writer, cycle);
writer.printRaw("CSV");
writer.end();
}
}
// next the backend service
package com.roartechnologies.ap.view.services;
import com.generationjava.io.CsvWriter;
import org.apache.tapestry.IComponent;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.engine.AbstractService;
import org.apache.tapestry.engine.IEngineServiceView;
import org.apache.tapestry.engine.ILink;
import org.apache.tapestry.request.RequestContext;
import org.apache.tapestry.request.ResponseOutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.text.MessageFormat;
import java.util.Date;
/**
* @author Joshua Long (josh@joshlong.com)
* <p/>
* The service takes the key passed in from
* the component and uses it to lookup the dump
* in a known place and then it generates the actual dump.
* <p/>
* This component uses the <i>Generation Java CSV </i>
* component to generate the CSV response stream.
* <p/>
* I am not too sure where to find it,
* but it's worked wonders for me and I completely recommend it.
*/
public class CSVService extends AbstractService {
public static final String SERVICE_NAME =
"com.roartechnologies.ap.view.services.csv-service";
public String getName() {
return SERVICE_NAME;
}
public void service(IEngineServiceView service_view,
IRequestCycle cycle,
ResponseOutputStream os) throws
ServletException, IOException {
Object[] params = getParameters(cycle);
String key = (String) params[0];
HttpSession session = cycle.getRequestContext().getSession();
Object mp = session.getAttribute(key);
if (null == mp) {
System.out.println(MessageFormat.format("There is no key
with value {0} exiting @ {1,date,long}", new Object[]{key, new
Date()}));
}
Object[][] rows_array = (Object[][]) mp;
RequestContext context = cycle.getRequestContext();
HttpServletResponse response = context.getResponse();
String dispositionHeader =
MessageFormat.format("attachment;filename=report_{0}.csv",
new
Object[]{Long.toString(System.currentTimeMillis())});
response.setHeader("Content-Disposition", dispositionHeader);
os.setContentType("application/vnd.ms-excel");
/* "text/comma-separated-values");*/
CsvWriter csv_writer = new CsvWriter(new
OutputStreamWriter(os));
for (int i = 0; i < rows_array.length; i++) {
Object row [] = rows_array[i];
String[] string_row = new String[row.length];
for (int a = 0; a < row.length; a++) {
string_row[a] = row[a] == null ? "" : row[a].toString();
}
csv_writer.writeLine(string_row);
}
csv_writer.close();
}
public ILink getLink(IRequestCycle iRequestCycle, IComponent
iComponent, Object[] objects) {
return constructLink(iRequestCycle, SERVICE_NAME, null, objects,
false);
}
}
/// now, finally, the specification..
<!DOCTYPE component-specification PUBLIC
"-//Apache Software Foundation//Tapestry Specification 3.0//EN"
"http://jakarta.apache.org/tapestry/dtd/Tapestry_3_0.dtd">
<component-specification
class="com.roartechnologies.ap.view.components.csv.CSVComponent"
allow-body="yes"
allow-informal-parameters="yes">
<parameter name="map"
direction="in"
required="yes"
type="java.lang.Object"/>
<parameter name="disabled"
direction="in"
required="no"
type="java.lang.Boolean"/>
<reserved-parameter name="href"/>
</component-specification>
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Re: xml generation someone?... (making more progress)
Posted by "matthew c. mead" <m-...@goof.com>.
I'm not sure about the namespacing with respect to URLs and requests - I
don't think you can use a / there, but if you want to organize templates
and page specifications by folder, it's doable. I'm doing the following:
<page name="Catalog.Page1" specification-path="Catalog/Page1.page"/>
<page name="Catalog.Page2" specification-path="Catalog/Page2.page"/>
<page name="Catalog.Page3" specification-path="Catalog/Page3.page"/>
<page name="Catalog.Page4" specification-path="Catalog/Page4.page"/>
<page name="Catalog.Page5" specification-path="Catalog/Page5.page"/>
Thus, my .page and template files for the catalog are in
WEB-INF/Catalog. However, when I want to refer to these pages and
activate them with code, I use a period for the "file separator" like
so: getPage("Catalog.Page1");
-matt
Bernard Sirius wrote:
>I've put the property in the page specification. That
>works. And the XML stuff I've added works too.
>
>Only it's a pitty that I have to put this property all
>over the place in each one of my page definitions.
>
>Now, there remains that idiotic thing about putting
>the templates inside a folder hierarchy. All the
>examples given throw everything under the WEB-INF in
>one huge bunch of files.
>
>Has tapestry lost the concept of a folder? ;-)
>
>about that template-extension problem, citing the
>documentation:
>
>org.apache.tapestry.template-extension
>
> Overrides the default extension used to locate
>templates for pages or components. The default
>extension is "html", this configuration property
>allows overrides where appropriate. For example, an
>application that produces WML may want to override
>this to "wml".
>
> This configuration property does not follow the
>normal search path rules. The <property> must be
>provided in the <page-specification> or
><component-specification>. If no value is found there,
>the immediate containing <application> or
><library-specification> is checked. If still not
>found, the default is used.
>
>-------------------------------
>
>I've tried putting it in the application spec. When I
>first tried it, it threw me an exception, saying it
>didn't find the template. When I put the html template
>in place, it worked.
>
>Then I've tried validating the app spec (using it's
>dtd)... here's what I have obtained:
>
>Referenced entity at
>"http://tapestry.sf.net/dtd/Tapestry_1_3.dtd".
>Attribute "value" must be declared for element type
>"property". [16]
>XML validation finished.
>-------------------------------
>
>...strange, or is it?
>
>bernard
>
>
>
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>
--
matthew c. mead
http://www.goof.com/
Re: xml generation someone?... (making more progress)
Posted by Bernard Sirius <be...@yahoo.com>.
I've put the property in the page specification. That
works. And the XML stuff I've added works too.
Only it's a pitty that I have to put this property all
over the place in each one of my page definitions.
Now, there remains that idiotic thing about putting
the templates inside a folder hierarchy. All the
examples given throw everything under the WEB-INF in
one huge bunch of files.
Has tapestry lost the concept of a folder? ;-)
about that template-extension problem, citing the
documentation:
org.apache.tapestry.template-extension
Overrides the default extension used to locate
templates for pages or components. The default
extension is "html", this configuration property
allows overrides where appropriate. For example, an
application that produces WML may want to override
this to "wml".
This configuration property does not follow the
normal search path rules. The <property> must be
provided in the <page-specification> or
<component-specification>. If no value is found there,
the immediate containing <application> or
<library-specification> is checked. If still not
found, the default is used.
-------------------------------
I've tried putting it in the application spec. When I
first tried it, it threw me an exception, saying it
didn't find the template. When I put the html template
in place, it worked.
Then I've tried validating the app spec (using it's
dtd)... here's what I have obtained:
Referenced entity at
"http://tapestry.sf.net/dtd/Tapestry_1_3.dtd".
Attribute "value" must be declared for element type
"property". [16]
XML validation finished.
-------------------------------
...strange, or is it?
bernard
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Re: xml generation someone?... (making progress)
Posted by Bernard Sirius <be...@yahoo.com>.
OK, I'm on my way...
I've added a bunch of classes for XML handling:
BasePage, Engine, NestedXmlWriter and XMLWriter
they are all trivial extensions of the base classes
(like in the wml package you mention)
now I want 2 things:
1. that templates for my application end with .xml;
2. that templates be arranged in a folder hierarchy
here's how I try to configure that in my .application
spec file:
<application name="helloworld"
engine-class="fractals.psychos.tapestry.BaseEngine" >
<description>Hello World Application</description>
<property
name="org.apache.tapestry.template-extension"
value="xml"/>
<library id="xmllib"
specification-path="/fractals/psychos/tapestry/XML.library"/>
<page name="Home"
specification-path="/pages/Home.page"/>
</application>
OK: please note 2 things: the
org.apache.tapestry.template-extension property and
the library property. In the library, I've only put
that same property again, the rest of a library
content being component definitions that I don't have
developed yet.
(please note that I have tried about all permutations
of the changes I've brought to the examples)
IMHO, this property states that tapestry has to look
for files ending with .xml for the templates.
... it doesn't work.
-> 2. notice the specification-path of the "Home"
page: it's an absolute path; I've tried relative, and
it doesn't work either. The only thing that works is
to put the Home.html right into the WEB-INF lib.
...ok THAT WORKS: the basic example works
but neither looking for templates ending with
something else than .html, nor finding them in
directories under WEB-INF work.
should be straitforward, even for HTML apps.
What am I missing here?
bernard
--- Geoff Longman <gl...@gmail.com> wrote:
> While Tapestry is essentially markup agnostic, the
> most of the
> framework components are geared towards generating
> HTML markup.
>
> There are implementations of components that
> generate markup other
> than HTML, for example there are components that
> generate WML .
>
> Have a look at the components in the
> org.apache.tapestry.wml package
>
> Geoff
>
>
> On Thu, 24 Feb 2005 06:36:21 -0800 (PST), Bernard
> Sirius
> <be...@yahoo.com> wrote:
> > Hi,
> >
> > I'm new to tapestry, having just done 1 or 2 tutes
> to
> > see how it works. Well, it's quite about what I
> need.
> > Really, I'm impressed. Only: I don't need to
> generate
> > HTML, only XML.
> >
> > I'm using Laszlo for my current project. Already
> heard
> > of it? Well it's a RIA (Rich Internet Application)
> > platform currently targeting the flash player.
> >
> > Laszlo has defined a specific xml language, along
> with
> > an ecmascript scripting language. Together they
> form a
> > very powerful mix to create GUIs. However, the
> whole
> > platform revolves arout the concept of data
> binding.
> > But here, the binding is done on the client, and
> the
> > data itself is XML.
> >
> > And that's why I need to generate XML. On the
> other
> > end, a laszlo app still interacts with the client
> > using HTTP, sending request parameters, etc...
> >
> > Well, I understand that a lot of what Tapestry
> does is
> > generate proper HTML markup. That I obviously
> won't
> > need. The interesting bits for me is the rest of
> > Tapestry: form validation and control flow
> > essentially.
> >
> > Let me add that I know about cocoon, and I know I
> > don't want to use it here. Same thing about
> Spring:
> > I'm using it already. And I'll still use Spring,
> and
> > if I cannot take advantage of Tapestry, I'll stick
> to
> > it. But I'd really love to give a try at making
> things
> > easier for me.
> >
> > So... has Tapestry already been used for that? Or
> am I
> > maybe completely wrong with the idea of using
> Tapestry
> > for XML generation ?
> >
> > And, maybe that's something to ask to the
> devel-list:
> > looking at the source code, it seems like XML
> > generation is an upcoming feature. Maybe I could
> help
> > here, who knows...
> >
> > bernard
> >
> > __________________________________
> > Do you Yahoo!?
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> >
> >
>
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Re: xml generation someone?
Posted by Geoff Longman <gl...@gmail.com>.
While Tapestry is essentially markup agnostic, the most of the
framework components are geared towards generating HTML markup.
There are implementations of components that generate markup other
than HTML, for example there are components that generate WML .
Have a look at the components in the org.apache.tapestry.wml package
Geoff
On Thu, 24 Feb 2005 06:36:21 -0800 (PST), Bernard Sirius
<be...@yahoo.com> wrote:
> Hi,
>
> I'm new to tapestry, having just done 1 or 2 tutes to
> see how it works. Well, it's quite about what I need.
> Really, I'm impressed. Only: I don't need to generate
> HTML, only XML.
>
> I'm using Laszlo for my current project. Already heard
> of it? Well it's a RIA (Rich Internet Application)
> platform currently targeting the flash player.
>
> Laszlo has defined a specific xml language, along with
> an ecmascript scripting language. Together they form a
> very powerful mix to create GUIs. However, the whole
> platform revolves arout the concept of data binding.
> But here, the binding is done on the client, and the
> data itself is XML.
>
> And that's why I need to generate XML. On the other
> end, a laszlo app still interacts with the client
> using HTTP, sending request parameters, etc...
>
> Well, I understand that a lot of what Tapestry does is
> generate proper HTML markup. That I obviously won't
> need. The interesting bits for me is the rest of
> Tapestry: form validation and control flow
> essentially.
>
> Let me add that I know about cocoon, and I know I
> don't want to use it here. Same thing about Spring:
> I'm using it already. And I'll still use Spring, and
> if I cannot take advantage of Tapestry, I'll stick to
> it. But I'd really love to give a try at making things
> easier for me.
>
> So... has Tapestry already been used for that? Or am I
> maybe completely wrong with the idea of using Tapestry
> for XML generation ?
>
> And, maybe that's something to ask to the devel-list:
> looking at the source code, it seems like XML
> generation is an upcoming feature. Maybe I could help
> here, who knows...
>
> bernard
>
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