To help others: while debugging ... I noticed that the model's 'load' method
is being called before the button's onSubmit handler is invoked. So, under
normal circumstances, when control reaches the submit handler and I save the
value from the Textfield to the database as a 'Category' and add the
DropDownChoice to the target ... it is to no avail, the model's load handler
is not invoked again.
But, per Linda's suggestion, explicitly detaching the 'categoriesModel' just
before adding it to the target causes the model's 'load' method to get
invoked before rending to the view:
protected void onSubmit(final AjaxRequestTarget target,
final Form<?> form)
{
Post updatedPost = (Post) form.getModelObject();
// new category? add to database and set in this post
updateCategoryInDatabase(updatedPost,
categoryCandidate.getModelObject());
// update author
final User user = ((UserSession)
Session.get()).getUser();
updatedPost.setAuthor(user);
// save post
final Post postWithId = postService.save(updatedPost);
// update the form's model (with the ID if it was saved
for the first time)
updatedPost = (Post) form.getModelObject();
updatedPost.setId(postWithId.getId());
// tell the world
final String msg = getTimestampString("m-saved");
info(msg);
* // redraw the categories
categoryModel.detach();
target.addComponent(categories);
*
// render the post's id (if not already rendered)
target.addComponent(postId);
// render the feedback message
target.addComponent(feedbackPanel);
}
I hope this is the generally accepted way to do this. Thanks,
-Luther
On Tue, Jun 9, 2009 at 11:57 AM, Luther Baker <[email protected]> wrote:
> In my submit handler - I invoke a service to first a) the save category and
> then b) save the post.
>
> I put a message into the feedback panel and add the feedback panel and the
> drop down to the target.
>
> It is off an AjaxFallbackbutton ... so, no, I don't think I've done
> anything to explicitly detach the model. Is it such that when the original
> page is initially rendered - the model would have attached and then
> detached. The user then takes time to fill out the form - and upon submit,
> the model attaches again where I currently get the form fields ... do some
> *work* ... and then when I'm finished, detaches again?
>
> New ground for me here ... should I explicitly invoke detach() at the
> beginning of the submit handler ... and then attach() at the end so that the
> render phase gets new data?
>
> Thanks,
>
> -Luther
>
>
>
>
>
>
>
> On Tue, Jun 9, 2009 at 8:52 AM, Linda van der Pal <
> [email protected]> wrote:
>
>> Did you explicitly detach the model?
>>
>> Regards,
>> Linda
>>
>> Luther Baker wrote:
>>
>>> Quick question regarding a blog engine I'm working on: my user is editing
>>> a
>>> blog Post and gets to the "Category" section.
>>>
>>> Category is implemented with a DropDownChoice and
>>> LoadableDetachableModel.
>>> For convenience - I also have a simple TextField that, when filled out,
>>> implicitly creates a new Category and attaches it to the current Post.
>>> For
>>> now, I only allow 1 Category per Post. The Category TextField takes
>>> precedence over the DropDown. IE: if the user types anything in the
>>> Category
>>> TextField, that (String) will be looked up, inserted if missing and
>>> attached
>>> to the Post as a Category.
>>>
>>> Question: after submitting this entire form (ala AjaxFallbackButton) - I
>>> intentionally stay on this page. The Category is added and the Post has
>>> been
>>> saved ... but I need the Category DropDown to refresh. Since all of this
>>> happens ala AjaxFallbackButtons - the process works except, the
>>> LoadableDetachableModel attached to the DropDownChoice (obviously)
>>> doesn't
>>> fire the load method when I add the DropDown to the target (in the submit
>>> handler).
>>>
>>> To clarify, in my submission, I just added a Category and saved the Post
>>> and
>>> ostensibly, redrawn the DropDownChoice (ie: I've set the OutputMarkupID
>>> on
>>> the DropDownChoice and attached it to the target in the ajax submit
>>> handler)
>>> ... but the underlying model isn't actually reloading. Is there something
>>> like a 'refresh' method on the LoadableDetachableModel ... or, should I
>>> attach it to the target as well?
>>>
>>> Thanks in advance for any suggestions,
>>>
>>> -Luther
>>>
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>>
>>
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