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Posted to users@wicket.apache.org by kshitiz <k....@gmail.com> on 2012/06/29 18:02:47 UTC
Components do not re-render when page is refreshed...
Hi,
In my wicket application, each page carries many panels. *Now every panel is
rendered when the page is loaded but when it is refreshed, nothing happens.
* No panel is getting rendered again, not even sysouts are printing
anything. *Now this is a good thing for performance but I want them to be
re-rendered.Is there any way to make it happen...??*
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Re: Components do not re-render when page is refreshed...
Posted by kshitiz <k....@gmail.com>.
Ok..thanks for helping me out Dan...:)
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Re: Components do not re-render when page is refreshed...
Posted by Dan Retzlaff <dr...@gmail.com>.
DataView/IDataProvider queries the database for each request too. The
reason it is preferred over PageableListView is that it allows only the
current page of results to be pulled from the database. PageableListView
requires *all* results to be pulled, but then only renders a single page.
At any rate, using an IModel-backed PageableListView will look something
like this:
IModel<List<MyItem>> itemsModel = new
LoadableDetachableModel<List<MyItem>>() {
protected List<MyItem> load() {
// query database for items
}
};
add(new PageableListView<MyItem>("item", itemsModel, 10) {
protected void populateItem(ListItem<MyItem> item) {
// populate item
}
});
On Sat, Jun 30, 2012 at 1:20 AM, kshitiz <k....@gmail.com> wrote:
> Actually I am using listview because I do want to query database every
> time I
> change page of pageable listview. How would I use IModel in
> pageableListview?
>
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Re: Components do not re-render when page is refreshed...
Posted by kshitiz <k....@gmail.com>.
Actually I am using listview because I do want to query database every time I
change page of pageable listview. How would I use IModel in
pageableListview?
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Re: Components do not re-render when page is refreshed...
Posted by Dan Retzlaff <dr...@gmail.com>.
I can't guess what your errors are, but for pageable lists you should
probably be using DataView. There are examples here:
http://www.wicket-library.com/wicket-examples/repeater/
On Fri, Jun 29, 2012 at 1:08 PM, kshitiz <k....@gmail.com> wrote:
> I am using list only like this:
>
>
> PageableListView<PostDomain> postDomainListView = new
> PageableListView<PostDomain>(
> "postList", *postDomainList*, postsPerPage)
> {
> // .....
>
> }
>
> How am I suppose to use IModel for list? It is giving errors over here...
>
>
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Re: Components do not re-render when page is refreshed...
Posted by kshitiz <k....@gmail.com>.
I am using list only like this:
PageableListView<PostDomain> postDomainListView = new
PageableListView<PostDomain>(
"postList", *postDomainList*, postsPerPage) {
// .....
}
How am I suppose to use IModel for list? It is giving errors over here...
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Re: Components do not re-render when page is refreshed...
Posted by Dan Retzlaff <dr...@gmail.com>.
Are you giving your ListView an IModel<List<T>> or a List<T>? It needs to
be the former to be redetermined on refresh.
On Fri, Jun 29, 2012 at 12:48 PM, kshitiz <k....@gmail.com> wrote:
> Actually in that post panel, I am taking data from the database and
> displaying it as listview. Now, when I manually enter a new entry in the
> database and then refresh page, the new entry is not getting displayed.
> This
> simple means that the given panel is not picking up the data from the
> database at every refresh or in other words, methods are not being called
> of
> that panel.
>
>
> --
> View this message in context:
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>
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Re: Components do not re-render when page is refreshed...
Posted by kshitiz <k....@gmail.com>.
Actually in that post panel, I am taking data from the database and
displaying it as listview. Now, when I manually enter a new entry in the
database and then refresh page, the new entry is not getting displayed. This
simple means that the given panel is not picking up the data from the
database at every refresh or in other words, methods are not being called of
that panel.
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Re: Components do not re-render when page is refreshed...
Posted by Scott Swank <sc...@gmail.com>.
It is rendered, but the existing page is reused so you do not see the
constructor called again. That's what Dan meant when he said, "That's
how Wicket manages stateful pages: it constructs it once, and
subsequent actions (including re-rendering all or part) are handled by
the
same instance."
You could override beforeRender() and/or afterRender() and add logging
there if you want to verify that rendering occurs.
That said, it's clear that you have some problem because you say that
"nothing happens" when the page is refreshed. So what you expect to
happen? What change do you not see?
Scott
On Fri, Jun 29, 2012 at 12:09 PM, kshitiz <k....@gmail.com> wrote:
> Hi,
>
> Thanks for the reply. Just to clarify, like if I am adding a panel:
>
> *add(new PostPanel("postPanel", pageParameters, userTypeDomain,
> userDomain));*
>
> So, how do I make it render at every page refresh...?
>
> --
> View this message in context: http://apache-wicket.1842946.n4.nabble.com/Components-do-not-re-render-when-page-is-refreshed-tp4650290p4650294.html
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>
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Re: Components do not re-render when page is refreshed...
Posted by Dan Retzlaff <dr...@gmail.com>.
Instead of using entities and strings in your constructors, use IModels
such as LoadableDetachableModel. When re-rendering (AJAX or reload), your
constructors aren't called again, but IModel#getObject() are called.
On Fri, Jun 29, 2012 at 12:09 PM, kshitiz <k....@gmail.com> wrote:
> Hi,
>
> Thanks for the reply. Just to clarify, like if I am adding a panel:
>
> *add(new PostPanel("postPanel", pageParameters, userTypeDomain,
> userDomain));*
>
> So, how do I make it render at every page refresh...?
>
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/Components-do-not-re-render-when-page-is-refreshed-tp4650290p4650294.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
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>
Re: Components do not re-render when page is refreshed...
Posted by kshitiz <k....@gmail.com>.
Hi,
Thanks for the reply. Just to clarify, like if I am adding a panel:
*add(new PostPanel("postPanel", pageParameters, userTypeDomain,
userDomain));*
So, how do I make it render at every page refresh...?
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Re: Components do not re-render when page is refreshed...
Posted by Dan Retzlaff <dr...@gmail.com>.
That's how Wicket manages stateful pages: it constructs it once, and
subsequent actions (including re-rendering all or part) are handled by the
same instance. If you want a label's content to be recomputed with each
rendering, give it an IModel<String> at construction instead of the actual
string.
On Fri, Jun 29, 2012 at 10:50 AM, kshitiz <k....@gmail.com> wrote:
> Hi,
>
> Like this is one page:
>
>
> public UserHome(final PageParameters pageParameters, UserDomain userDomain)
> {
> super(pageParameters, userDomain);
> if (userDomain == null)
> userDomain = getUserById(this.userId);
>
> add(new SearchPanel("searchPanel"));
>
> // user name to appear in required pages
> * Label nameLabel = new Label("name", userDomain.getName());
> add(nameLabel);
> *
> *system.out.println("This should be printed every time");*
>
> }
>
> Now, when the page loads the first time, *This should be printed every
> time*
> is printed. That means, contructor is called. But when the page is
> refreshed, nothing is printed. To give you more details, suppose this is
> the
> url of the page:
>
> /http://localhost:8080/Page?32/
>
> When, I just refresh the whole url, nothings happens but when I remove
> parameters of the url....(/http://localhost:8080/Page/, rendering happens
> again. Why is this happening?
>
>
>
> scott.swank wrote
> >
> > How do you construct your panels? This sounds like a model issue...
> >
> > Scott
> >
> > On Fri, Jun 29, 2012 at 9:02 AM, kshitiz <k.agarwal4@> wrote:
> >> Hi,
> >>
> >> In my wicket application, each page carries many panels. *Now every
> panel
> >> is
> >> rendered when the page is loaded but when it is refreshed, nothing
> >> happens.
> >> * No panel is getting rendered again, not even sysouts are printing
> >> anything. *Now this is a good thing for performance but I want them to
> be
> >> re-rendered.Is there any way to make it happen...??*
> >>
> >> --
> >> View this message in context:
> >>
> http://apache-wicket.1842946.n4.nabble.com/Components-do-not-re-render-when-page-is-refreshed-tp4650290.html
> >> Sent from the Users forum mailing list archive at Nabble.com.
> >>
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> >>
> >
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> >
>
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Re: Components do not re-render when page is refreshed...
Posted by kshitiz <k....@gmail.com>.
Hi,
Like this is one page:
public UserHome(final PageParameters pageParameters, UserDomain userDomain)
{
super(pageParameters, userDomain);
if (userDomain == null)
userDomain = getUserById(this.userId);
add(new SearchPanel("searchPanel"));
// user name to appear in required pages
* Label nameLabel = new Label("name", userDomain.getName());
add(nameLabel);
*
*system.out.println("This should be printed every time");*
}
Now, when the page loads the first time, *This should be printed every time*
is printed. That means, contructor is called. But when the page is
refreshed, nothing is printed. To give you more details, suppose this is the
url of the page:
/http://localhost:8080/Page?32/
When, I just refresh the whole url, nothings happens but when I remove
parameters of the url....(/http://localhost:8080/Page/, rendering happens
again. Why is this happening?
scott.swank wrote
>
> How do you construct your panels? This sounds like a model issue...
>
> Scott
>
> On Fri, Jun 29, 2012 at 9:02 AM, kshitiz <k.agarwal4@> wrote:
>> Hi,
>>
>> In my wicket application, each page carries many panels. *Now every panel
>> is
>> rendered when the page is loaded but when it is refreshed, nothing
>> happens.
>> * No panel is getting rendered again, not even sysouts are printing
>> anything. *Now this is a good thing for performance but I want them to be
>> re-rendered.Is there any way to make it happen...??*
>>
>> --
>> View this message in context:
>> http://apache-wicket.1842946.n4.nabble.com/Components-do-not-re-render-when-page-is-refreshed-tp4650290.html
>> Sent from the Users forum mailing list archive at Nabble.com.
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@.apache
>> For additional commands, e-mail: users-help@.apache
>>
>
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Re: Components do not re-render when page is refreshed...
Posted by Scott Swank <sc...@gmail.com>.
How do you construct your panels? This sounds like a model issue...
Scott
On Fri, Jun 29, 2012 at 9:02 AM, kshitiz <k....@gmail.com> wrote:
> Hi,
>
> In my wicket application, each page carries many panels. *Now every panel is
> rendered when the page is loaded but when it is refreshed, nothing happens.
> * No panel is getting rendered again, not even sysouts are printing
> anything. *Now this is a good thing for performance but I want them to be
> re-rendered.Is there any way to make it happen...??*
>
> --
> View this message in context: http://apache-wicket.1842946.n4.nabble.com/Components-do-not-re-render-when-page-is-refreshed-tp4650290.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
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