I'd like to bring up an issue I already posted to the user mailing list
but got no response for:
Today I noticed a strange behaviour of T4's EventListeners. I wanted an
Any component which renders as a button to submit a form and call my
listener method after form submission. The docs say that's what the
EventListener's submitForm parameter is for. So I went about and wrote
an EventListener, targeted it at my Any component, made it listen to the
onclick event and set submitForm to my form (page class and HTML
template below). When I tested my work nothing at all happened. I then
checked the generated HTML and found that Tapestry did not generate any
event connection code. When I removed the submitForm parameter it
suddenly did and my listener method got called the way it's supposed to.
I dived into T4's sources and found out the following:
In ComponentEventConnectionWorker Tapestry stores a list of event
connections to form components which are not rendered yet and renders
those when the corresponding form component gets rendered. It stores
those connections in a Map and uses the form's _id_ as a key (in
filterFormEvents on line 412). It then checks all components whether
they got deferred connections to be set up by querying the map using the
component's _extended id_ and therefore never finds any deferred
connections for any component. I changed isDeferredForm,
linkDeferredForm and mapFormNames to use the form's id and suddenly
Tapestry generates the connection setup javascript code and my form's
submit listener gets called.
But my listener methods which I annotated with the EventListener
annotation still don't get called.
Am I doing something wrong or is this a bug in Tapestry for which I
should file an issue?
Uli
page class:
public abstract class TestPage extends BasePage
{
public abstract boolean getChecked();
@EventListener(targets="submitFormAsync", events="onclick",
submitForm="myForm", async=true)
public void submitFormAsync() {
System.out.println("EventListener called from submitFormAsync");
}
@EventListener(targets="submitForm", events="onclick",
submitForm="myForm")
public void submitForm() {
System.out.println("EventListener called from submitForm");
}
@EventListener(targets="callListenerAsync", events="onclick",
async=true)
public void callListenerAsync() {
System.out.println("EventListener called from callListenerAsync");
}
public void formListener()
{
System.out.println("Form's listener got called");
System.out.println("checked: " + getChecked());
}
}
page template:
<html jwcid="@Shell" title="Test Page"
xmlns='http://www.w3.org/1999/xhtml'
doctype='html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\"
\"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\";'
debugEnabled="true"
browserLogLevel="DEBUG"
consoleEnabled="true">
<head>
<title>Test Page</title>
<body jwcid="@Body">
<form jwcid="[EMAIL PROTECTED]" listener="listener:formListener">
<input jwcid="@Checkbox" value="ognl:checked" /><br />
</form>
<p><input jwcid="[EMAIL PROTECTED]" type="button" value="literal:submit
form via EventListener" /></p>
<p><input jwcid="[EMAIL PROTECTED]" type="button"
value="literal:submit form async via EventListener" /></p>
<p><input jwcid="[EMAIL PROTECTED]" type="button"
value="literal:call an EventListener async without submitting the Form"
/></p>
</body>
</html>
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