How do I solve this “Cannot read property 'appendChild' of null” error?

Question

I tried to use this code below, which adds buttons in slideshow on my site:

window.onload = function loadContIcons() {
    var elem = document.createElement(\"im         


        

Answer 1

For all those facing a similar issue, I came across this same issue when i was trying to run a particular code snippet, shown below.

https://codepen.io/pcwanderer/pen/MMEREr

Looking at the error in the console for the above code.

Since the document.getElementById is returning a null and as null does not have a attribute named appendChild, therefore a error is thrown. To solve the issue see the code below.

https://codepen.io/pcwanderer/pen/pXWBQL

I hope this helps. :)