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Groups > comp.lang.javascript > #34116

Re: removeeventlistener

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Andrew Poulos wrote:

> I have code that looks like this
> 
> function elementOver() {
>    return function() {
>      this.style...
>    };
> }
> 
> function setOver(elem) {
>    for (var i = 0; elem.length; i++) {
>      elem[i].addEventListener("mouseover", elementOver() );
>    }
> }
> 
> function disableOver(elem) {
>    for (var i = 0; i < elem.length; i++) {
>      elem[i].removeEventListener("mouseover", elementOver() );
>    }
> }
> 
> Adding the listener works but removing it doesn't. I don't understand
> why not nor how to remove the listeners?

Every time you call elementOver(), you create a *new* Function instance and 
return a reference to *that*.

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removeeventlistener Andrew Poulos <ap_prog@hotmail.com> - 2017-10-16 14:29 +1100
  Re: removeeventlistener Julio Di Egidio <julio@diegidio.name> - 2017-10-15 21:08 -0700
  Re: removeeventlistener Richard Maher <maher_rjSPAMLESS@hotmail.com> - 2017-10-16 13:06 +0800
  Re: removeeventlistener Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-10-16 22:18 +0200
    Re: removeeventlistener Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-10-28 19:48 +0200
      Re: removeeventlistener Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-10-28 20:00 +0200

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