On 2 November 2013 15:28, David Bruant <bruan...@gmail.com> wrote:
>> function f(e){tellSomebodyAboutTheEvent(x);}
>>
>> (function(){
>> var iframe = document.getElementByTagName('iframe')[0];
>> iframe.addEventListener('someEvent', f);
>> })()
>>
> There is a point in your program in which you know that 'iframe' won't be
> needed anymore and you do something about that. Maybe you clear a given data
> structure, maybe you remove the iframe from the document without assigning
> it to a variable, maybe you do something else, but you do do something.
> It's at this point that either you want to remove the listener or reassign x
> to another value.
A library author may have little control over how iframe is used. A
caller may use another library that caches all iframes for some
purposes etc. However, I suspect that a lot of problems for library
authors can go away if JS provides API like removeAllEventListeners.
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