Overview
private void handleError()
private native void registerErrorHandler()
foo.attachEvent("EventName", handlerReference);
Functionality
I need to pass the GWT method as a function parameter into the foo.attachEvent()
function, i tried several approaches:
foo.attachEvent("Error", registerErrorHandler);
-> TypeMismatchException
foo.attachEvent("Error", this.@package.foo::registerErrorHandler());
-> TypeMismatchException
var handler = this.@package.foo::registerErrorHandler()();
foo.attachEvent("Error", handler);
-> TypeMismatchException
Plain Javascript
When I write this in plain Javascript, it's working:
function handleError() {
alert("Error");
}
function registerErrorHandler() {
var event = "Error";
var handler = handleError;
foo.attachEvent (event, handler);
}
How can I implement that into GWT? I am having a lot of problems completely understanding the Javascript - Java Objects conversion. I understand the handleError
function reference as a JavaScriptObject
, but I am not able to get it working with that information.
you code needs to look like this: (there are only one time braces, therefore the function is not executed...)
var handler = this.@package.foo::registerErrorHandler();
foo.attachEvent("Error", handler);
but what you also want to do is wrap your function in the $entry function so that your uncaught exception handler will work:
var handler = this.@package.foo::registerErrorHandler();
foo.attachEvent("Error", $entry(handler));
What you can always do is build a js function that directly calls your gwt function:
var that = this;
var handler = function(){
that.@package.foo::registerErrorHandler()();
};
foo.attachEvent("Error", $entry(handler));
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