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
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