On 8/10/2011 4:50 PM, e-lena-s wrote:
I am trying to listen to a custom JS event that is created outside my
GWT module. In my JS file I create the event, and then fire it as
such :
var evt = document.createEvent("Event");
evt.initEvent('customEvent', true, true);
evt.customData = "someData";
window.addEventListener('customEvent', function(evt)
{ console.log("test: " + evt.customData)}, false);
window.dispatchEvent(evt);
Now, in my GWT code, I have a JSNI method that adds a listener to
listen to my customEvent and act on it. Code as follows:
public native void addLookupResultHandler()/*-{
$wnd.addEventListener('lookupEntitySelected',
$entry(function(evt){
console.log("gwt: " + evt.customData);
console.log("gwt: " + evt.type);
@myClassName::handleEvent(LmyCustomEventEvent;)(evt)
}), false);
}-*/;
The problem I have is that the customData is being dropped when the
event gets to JSNI code. I can see that the event listner written in
JS does get the correct event with the correct customData, but logging
the event properties in JSNI shows that customData is undefined (event
type looks correct though)
Am I doing something wrong here ?
Is there may be a better way to create custom events (it has to be
created in JavaScript, since the code firing it won't be in GWT
module)
My earlier answer was not correct. I don't see why
addLookupResultHandler is a JSNI routine. I think you want to write it
in GWT, via handling a NativeEvent. However, I've never tried this, so
it may not work as you intend.
OTOH, maybe you should be using the GWT event bus. From an architectural
perspective, I think that's a better choice. Instead of using
window.dispatch(), fire the event via a JSNI method. So, your first JS
sample should become a JSNI routine that calls a Java routine that calls
eventBus.fire(), and your second example should become Java. It's
possible to call eventBus.fire() entirely within JSNI, but getting that
eventBus argument to your JSNI method may be problematic.
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