addEventListener on getElementsByClassName

Don't know why this doesn't work?

window.onload  = function (){
    var inner = document.getElementsByClassName('inner');
    inner[0].addEventListener("scroll", runthis);

Receive an error on console:

Cannot read property 'addEventListener' of undefined

The class exists and there's only one of them. So I'm only targeting the first and only element.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Rainer JeschorCommented:
what does this show:
window.onload  = function (){
     var inner = document.getElementsByClassName('inner');

Open in new window

intoxicated_curveballAuthor Commented:
Says "1"

Also I tried my code locally and it works, so perhaps it has something to do with the "inner" div being loaded dynamically??
intoxicated_curveballAuthor Commented:
This is weird. On the page in question, the HTML is located directly in the <script> tag... what does this mean?

<script type="text/template">

                        <div class="inner">
                              <table class="items">
Rainer JeschorCommented:
this is normally used to create "pure" JavaScript templating (not using any custom JS framework like AngularJS or knockout).

But without any references this does not really make sense.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.