Can't understand from the manual: how actually to run JS function from Java?
For example, I have a function in my html page:
<script type="text/javascript" language="javascript">
function foo() {
alert('Foo!');
}
</script>
The following module shows two buttons, only second of which works:
public class Test_GoogleWeb_JSNI_01 implements EntryPoint {
public void onModuleLoad() {
Button fooButton = new Button("Foo!");
fooButton.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event) {
fooRunner();
};
});
HTML fooButtonNative = new HTML();
fooButtonNative.setHTML("<input type='button' value='Foo Native' onclick='foo()'>");
RootPanel rootPanel = RootPanel.get();
rootPanel.add(fooButton);
rootPanel.add(fooButtonNative);
}
public static native void fooRunner() /*-{
foo();
}-*/;
}
It is said in manual, that native functions implemented within nested frame, which explains the situation. But how to run JS functions then?
UPDATE 1 The following works.
Java:
public static native void fooRunner() /*-{
$doc.fooRunner();
}-*/;
JS:
<script type="text/javascript" language="javascript">
document.fooRunner = function foo() {
alert('Foo!');
}
</script>
Is there a better way?
You answered your question yourself. There is no better way for a very simple reason: there are multiple ways to deploy GWT app, running in iframe is only one of the options. So that's why you have to use $wnd variable to access external JS function, so in case if you switch the linker , your still code will work just fine.