Setting innerHTML: Why won't it update the DOM?

Question

Wondering why I can\'t get document.getElementById(\"my_div\").innerHTML to update the DOM when I re-assign the variable. For example:

Answer 1

For future googlers my problem was that I was calling the plural elements.

document.getElementsByClassName(‘class’).innerHTML

So it returned an Array not a single element. I changed it to the singular.

document.getElementByClassName(‘class’).innerHTML

That made it so I could update the innerHTML value.