Calling JSNI function or Java function to handle onClick event

[DK]

I have an anchor element with an onClick="showAlert();"

in my java file, I have a JSNI function

public static native void showAlert() /*-{
alert('Hello');
}-*/;

I never see this alert. In fact, when I look at the browser console, I
see that showAlert could not be found. What am I missing here ?

[kozura]

Java functions are translated into obfuscated (ie renamed) javascript,
so will not be available to call from an element. You can create a
javascript function, perhaps attached to wnd, which could then call a
java function.

[Manuel Carrasco Moñino]

Although GWT obfuscates the produced javascript code renaming methods,
classes, etc, it is possible to use a GWT method from javascript if
you export it storing a reference in the window object:
private native void exportMyMethod() /*-{
$wnd.showAlert = function(name) {
return .@com.example.MyClass::showAlert(Ljava/lang/String;) (message);
};
}-*/;

Take a look to this article I wrote time ago:
http://code.google.com/p/gwtchismes/wiki/Tutorial_ExportingGwtLibrariesToJavascript_en

-Manolo

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