Question

What is this?:

document.getElementById("+id+")

I have seen this used several times in code on other sites, and I was wondering what it’s specific use was and if there is an alternate to using this code.

— Edit —

Here is an example of one of the sites I recently saw it on.

Answer 1

Ok, everyone seems to have missed the fact that those are 2 single quotes and not a single double quote 🙂

document.getElementById(''+id+''); //two single quotes

This is equivalent to the below except it seems to be doing string concatenation before the value is passed.

document.getElementById(id);