I have a GWT project and I would like to add a script tag to the main html file of the GWT project that calls a Java function located in my client code.
According to the documentation I should add something like the following html tag:
<script type='text/javascript'>
[email protected]::myFunction();
</script>
where .myCompany.myProject.client.myClass is the class path and myFunction is the java function I would like to call.
When I try this with the following implementation of myFunction nothing happens:
public void myFunction() {
HTMLPanel panel = new HTMLPanel("I have been called");
RootPanel.get().add(panel);
}
That is, myFunction is not being called.
But when I make the same call from a JSNI method, then it works.
Is it maybe not possible to do the call from an html script, or am I doing something wrong?
Thanks!
I have a GWT project and I would like to add a script tag to the main html file of the GWT project that calls a Java function located in my client code.
According to the documentation I should add something like the following html tag:
<script type='text/javascript'>
[email protected]::myFunction();
</script>
where .myCompany.myProject.client.myClass is the class path and myFunction is the java function I would like to call.
When I try this with the following implementation of myFunction nothing happens:
public void myFunction() {
HTMLPanel panel = new HTMLPanel("I have been called");
RootPanel.get().add(panel);
}
That is, myFunction is not being called.
But when I make the same call from a JSNI method, then it works.
Is it maybe not possible to do the call from an html script, or am I doing something wrong?
Thanks!
Share Improve this question edited Mar 27, 2011 at 20:04 Mike asked Mar 27, 2011 at 19:39 MikeMike 2232 gold badges4 silver badges7 bronze badges 01 Answer
Reset to default 13What you are trying to do does not work because GWT piler renames all identifier names to minimize produced code size: so
myFunction()exists, but it's called something else.You were looking at old version of documentation. In the latest version this is all explained: Calling a Java Method from Handwritten JavaScript
The solution - add an additional method somewhere:
public static native void exportMyFunction() /*-{
$wnd.myFunction =
$entry(@.myCompany.myProject.client.myClass::myFunction());
}-*/;
then in your app initialization you must call EnclosingClass.exportMyFunction(). Then in hand-crafted javascript you can access it via:
window.myFunction();