How can I support window.addEventListener in IE 8 without modifying the source of a script?

Question

I try to animate header in IE8 but i see error "Invalid procedure call or argument"

function init() {
    window.addEventListener( 'scroll', function( event ) {
        if( !didScroll ) {
            didScroll = true;
            setTimeout( scrollPage, 250 );
        }
    }, false );
}

I wound similar solution here ( addEventListener not working in IE8 ) but i can't modify my source....

Try a polyfill https://github.com/jonathantneal/EventListener — elclanrs, Oct 22 '14 at 08:29
This is not supported below IE9 https://developer.mozilla.org/en-US/docs/Web/API/EventTarget.addEventListener — Nunners, Oct 22 '14 at 08:30
*"i can't modify my source"* Huh? Sorry, that requires explanation. As far as I can tell, this is a simple duplicate of the question you've linked to. — T.J. Crowder, Oct 22 '14 at 08:31
@T.J.Crowder it means exactly that, OP can't change the code of the function. Like elclanrs said, a polyfill is needed here. — user247702, Oct 22 '14 at 08:32
@elclanrs: The question is vague at best, but your point might actually be an answer rather than a comment. — T.J. Crowder, Oct 22 '14 at 08:33
@T.J.Crowder no, it would require loading an additional file, before this script is executed. — user247702, Oct 22 '14 at 08:33
@Stijn: And how do you propose loading an additional file without changing something? I didn't say he had to change his *JavaScript*, I said that would require modifying things (specifically, the HTML). — T.J. Crowder, Oct 22 '14 at 08:34
@mplungjan indeed, don't make such assumptions. I downvoted your answer because it modifies the function. — user247702, Oct 22 '14 at 08:35

score 1 · Answer 1 · edited May 23 '17 at 12:18

So that you have an answer you can accept, summarizing the comments:

If you can modify your JavaScript code (despite what it says in the question), you can use the techniques in the answers to the question you linked to hook the event.
If you can modify your HTML but not your JavaScript, you can add a script prior to your existing one that adds a polyfill to IE to make addEventListener available. elclanrs pointed to this one.
If you can't do either of those things, there's nothing you can do.

How can I support window.addEventListener in IE 8 without modifying the source of a script?

1 Answers1