Ajax Re-render does not work after AbstractRestartResponseException()
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Key: WICKET-1450
URL: https://issues.apache.org/jira/browse/WICKET-1450
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.3.2
Environment: Windows XP Java 1.6.0_05-b13
Reporter: Matthew Young
To handle possible exception in Model#getObject(): I do
1) make note of exception has occurred (and subsequently only return some error
value and not cause exception thrown again),
2) register an error feedback message,
3) calll page.detach() (for clean up and reset?, I'm not sure but I know this
makes FeedbackPanelErrorMessage reload message from session) and
4) throw new AbstractRestartResponseException() to re-render response with the
new error message from the model shown.
I'm finding that this works perfectly in non-Ajax. But in Ajax, there are 2
problems:
1) the error message register in step 2) above is not rendered in the
FeedbackPanel
2) the Ajax response is incomplete, it's missing the label component in my test
case and missing the </ajax-response> closing tag.
Test case below: if you enter "blowup" in the text field, the label's model
will do the steps outline above. Run this in non-Ajax and you will see two
error messages as expected. Run in Ajax, you will see the problem (open Wicket
Ajax Debug panel to see).
= = = = HomePage.html:
<html>
<head></head>
<span wicket:id="message">message will be here</span>
<form wicket:id="form">
<input type="text" wicket:id="word"/>
<input type="submit" value="Enter" wicket:id="submitButton"/>
</form>
<span wicket:id="feedback">FEEDBACK</span>
</html>
= = = = = HomePage.java:
public class HomePage extends WebPage {
private static final long serialVersionUID = 1L;
private String word;
public HomePage(final PageParameters parameters) {
add(new FeedbackPanel("feedback") {
private static final long serialVersionUID = 1L;
@Override protected void onBeforeRender() {
System.out.println("= = = = FeedbackPanel
onBeforeRender()");
System.out.println(" FeedbackbackMessageModel =
" + getFeedbackMessagesModel().getObject());
super.onBeforeRender();
}
}.setOutputMarkupPlaceholderTag(true));
// if the word "blowup" is entered,
//this register a error message and throw
IModel model = new Model() {
private static final long serialVersionUID = 1L;
@Override public Object getObject() {
if (word != null && word.equals("blowup")) {
word = "-w-e-b-l-e-w-u-p-";
HomePage.this.fatal("[2/2]This message
is from Model.");
getPage().detach();
System.out.println("! ! ! ! ! throwing
new AbstractRestartResponseException()");
throw new
AbstractRestartResponseException() {
private static final long
serialVersionUID = 1L;
};
} else {
return "The word is: \"" + (word ==
null ? " n u l l " : word) + "\"";
}
}
};
add(new Label("message", model) {
private static final long serialVersionUID = 1L;
@Override protected void onBeforeRender() {
System.out.println("= = = = Label onBeforeRender(),
model = " + getModel().getObject());
super.onBeforeRender();
}
}.setOutputMarkupId(true));
Form form = new Form("form", new CompoundPropertyModel(this));
add(form);
form.add(new TextField("word").setRequired(true));
AjaxFallbackButton submitButton = new
AjaxFallbackButton("submitButton", form) {
private static final long serialVersionUID = 1L;
@Override protected void onSubmit(AjaxRequestTarget target,
Form f) {
if (word != null && word.equals("blowup")) {
HomePage.this.error("[1/2]This message is from
onSubmit. There should also be a message from model");
}
if (target != null) {
target.addComponent(HomePage.this.get("feedback"));
// clear error feedback if any
target.addComponent(HomePage.this.get("message"));
}
}
@Override protected void onError(AjaxRequestTarget target, Form
f) {
target.addComponent(HomePage.this.get("feedback"));
// show updated error feedback
}
};
form.add(submitButton);
}
}
= = = = = WicketApplication.java:
public class WicketApplication extends WebApplication
{
public WicketApplication() {
}
public Class<? extends WebPage> getHomePage() {
return HomePage.class;
}
@Override public RequestCycle newRequestCycle(Request request, Response
response) {
return new WebRequestCycle(this, (WebRequest) request,
(WebResponse) response) {
@Override public Page onRuntimeException(Page page,
RuntimeException e) {
// page can be null
if (page == null) {
return super.onRuntimeException(page,
e);
}
return page;
}
};
}
}
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