Uncaught TypeError: text.select is not a function

I ran into this problem today and felt frustrated just as you when the marked answer didn't work for me. After some additional thinking i realised my problem was trying to paste into paragraph element <p></p>. When I changed it to textarea it worked well. So you indeed had a problem with the access to the array but when you finally got to the specific element you should have made sure its an editable element.

Good luck!

getElementsByClassName returns a HTMLCollection of found elements not an individual element. A HTMLCollection indeed does not have a select function.

You probably want the first element in the collection

var text = document.getElementsByClassName('js-text');
text[0].select();