Javascript add count to a number with comma

Question

So I have this

var str=document.getElementById('elem').innerHTML;
str=parseInt(str)+1;

<span id="elem">1,500</span>

and I can't get it to take the entire number and add one (+1) to the number without taking comma off. Can you suggest something?

Answer 1

Remove the commas by replacing them with an empty string, then you can parse the string.

Remember the second parameter in the parseInt method that specifies the base, so that it doesn't use base 8 for zero padded values.

var num = parseInt(str.replace(/,/g, ''), 10) + 1;

If you want to put the changed number back formatted with commas, you can use:

var s = num.toString();
for (var i = s.length - 3; i > 0; i -= 3) {
  s = s.substr(0, i) + ',' + s.substr(i);
}
document.getElementById('elem').innerHTML = s;