How do I concatenate a string with a variable?

Question

So I am trying to make a string out of a string and a passed variable(which is a number). How do I do that?

I have something like this:

function AddB         


        

Answer 1

This can happen because java script allows white spaces sometimes if a string is concatenated with a number. try removing the spaces and create a string and then pass it into getElementById.

example:

var str = 'horseThumb_'+id;

str = str.replace(/^\s+|\s+$/g,"");

function AddBorder(id){

    document.getElementById(str).className='hand positionLeft'

}