Finding out when a GWT module has loaded
I am exporting a GWT method to native javascript in the following manner:
public class FaceBookGalleryEntryPoint implements EntryPoint {
@Override
public void onModuleLoad() {
FacebookGallery facebookGallery = new FacebookGallery();
RootPanel.get().add(facebookGallery);
initLoadGallery(facebookGallery);
}
private native void initLoadGallery(FacebookGallery pl) /*-{
$wnd.loadGallery = function (galleryId) {
pl.@com.example.fbg.client.FacebookGallery::loadGallery(Ljava/lang/String;)(galleryId);
};
}-*/;
}
In the host page, I am trying to invoke it:
<html>
<head>
<title>Facebook image gallery</title>
<script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
</head>
<body>
<script type="text/javascript" src="/fbg/fbg.nocache.js"></script>
<h1>Facebook gallery test</开发者_如何转开发h1>
<script type="text/javascript">
$(document).ready(function() {
loadGallery('blargh');
});
</script>
</body>
</html>
Unfortunately, when the document.ready callback is invoked, the function is not yet defined. When manually executed from the Firebug console the function works just fine.
I could perform some polling every 50 milliseconds until I find a defined function by that name, but it seems like a horrible approach.
How can I get notified when the module is loaded and therefore when the function is available?
I would try to define a callback function in the hostpage and call it from GWT at the end of the onModuleLoad() method.
Hostpage function:
<script type="text/javascript">
function onGwtReady() {
loadGallery('blargh');
};
</script>
GWT:
public void onModuleLoad() {
FacebookGallery facebookGallery = new FacebookGallery();
RootPanel.get().add(facebookGallery);
initLoadGallery(facebookGallery);
// Using a deferred command ensures that notifyHostpage() is called after
// GWT initialisation is finished.
Scheduler.get().scheduleDeferred(new Command() {
public void execute() {
notifyHostpage();
}
}
}
private native void notifyHostpage() /*-{
$wnd.onGwtReady();
}-*/;
加载中,请稍侯......
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