Catching Window.onUnload event

[buz...@gmail.com]

Hello,

Is there a way in GWT to catch Window.onUnload event.

I need that to detect when user navigates away from the page, but does
not close the browser.
I have written a native implementation, but are there any plans to add
Window.addUnloadListener() functionality?
Or am I missing something?

My implementation looked like this () :

public abstract class MeasuringEntryPoint implements EntryPoint {

private static final List onunloadListneners = new ArrayList();

public MeasuringEntryPoint() {
attachOnUnloadListener();

addUnloadListener(new
MeasuringEntryPoint.WindowUnloadListener() {
public void onWindowUnloaded() {
detachOnUnloadListener();
Collection measurements =
MeasurementStorage.retrieveMeasurements();
MeasurementDeliveryGateway.deliver(measurements);
}
});
}

public static void addUnloadListener(WindowUnloadListener
listener) {
onunloadListneners.add(listener);
}

public static void onUnload() {
for (Iterator iterator = onunloadListneners.iterator();
iterator.hasNext();) {
WindowUnloadListener listener = (WindowUnloadListener)
iterator.next();
listener.onWindowUnloaded();
}
}

private native void attachOnUnloadListener() /*-{
$wnd.onunload = function() {
@com.mycoolapp.gwt.client.MeasuringEntryPoint::onUnload()
();
}
}-*/;

private native void detachOnUnloadListener() /*-{
$wnd.onunload = null
}-*/;

}

Thanks,
Dmitry

[Thomas Broyer]

On 3 sep, 11:13, "buz...@gmail.com" <buz...@gmail.com> wrote:
> Hello,
>
> Is there a way in GWT to catch Window.onUnload event.

use a WindowCloseListener.

> I need that to detect when user navigates away from the page, but does
> not close the browser.

This is not possible in JavaScript, there's only an 'unload' event, no
'close' event or similar.

> I have written a native implementation, but are there any plans to add
> Window.addUnloadListener() functionality?
> Or am I missing something?

Window.addWindowCloseListener *is* relying on beforeunload and unload
events.

[jagadish panigrahi]

Hi Dimitri,

Did you find any solution in GWT for above mentioned problem that would invoke an event when user navigates away from the screen without closing it