2011/3/22 Mark McDonnell <mark.m...@gmail.com>:
> I'm having a bizarre issue removing an event listener (this occurs in both
> Firefox and Chrome).
>
> If I run the following code via the console…
>
> document.getElementsByTagName('body')[0].addEventListener('click',
> function(e){ alert(e); }, false);
>
> …the event listener is added successfully, but if I run the following code
> also in the console to remove the event listener it doesn't appear to
> actually remove the event listener?...
>
> document.getElementsByTagName('body')[0].removeEventListener('click',
> function(e){ alert(e); }, false);
>
> …I'm really confused why this wouldn't work?
Those listeners are totally different functions. If you are planning
to remove an event listener, make it a separate function, and use that
with addEventListener and removeEventListener. For example:
function clickHandler(e) {
alert(e);
}
document.getElementsByTagName('body')[0].addEventListener('click',
clickHandler, false);
// ...
document.getElementsByTagName('body')[0].removeEventListener('click',
clickHandler, false);
Creating anonymous functions each time creates 2 different functions,
so you cannot remove it, as u haven't added that, but a different
function, that has the same implementation. Just think of:
var a = {}, b = {};
alert(a === b); // false
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Poetro
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