On Mon, Nov 9, 2009 at 3:36 PM, Karen <karent...@gmail.com> wrote:
>
> I looked in the library that removeListener is supported but am not
> fully sure how to use it.
>
> I tried using "this", but that doesn't seem to successfully remove the
> listener. What am I missing here?
>
> chrome.extension.onConnect.addListener( function( port ) {
>
> if (port.name == "foo") {
> port.onMessage.addListener(function(msg) {
>
> chrome.extension.connect( {name:
> "foo"} ).onMessage.removeListener( this );
> ....
> }
> }
> }
Good question. You need a reference to the function. |this| won't do
what you want, it returns a reference to the object the currently
executing function was called as a method of. In this case, there is
no such object, so it just returns the global object.
If you are inside a function, and want a reference to that function,
you can always use arguments.callee, like this:
port.onMessage.addListener(function() {
port.onMessage.removeListener(arguments.callee);
});
Another way to do it is to give the function a name, then you can
refer to it by that name:
function listener() {
port.onMessage.removeListener(arguments.callee);
}
port.onMessage.addListener(listener);
HTH,
- a
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