Question

Possible Duplicate:
Check if a variable contains a numerical value in Javascript?

How do I check if variable is an integer in jQuery?

Example:

if (id == int) { // Do this }

Im using the following to get the ID from the URL.

var id = $.getURLParam("id");

But I want to check if the variable is an integer.

Answer 1

Try this:

if(Math.floor(id) == id && $.isNumeric(id)) 
  alert('yes its an int!');

$.isNumeric(id) checks whether it’s numeric or not
Math.floor(id) == id will then determine if it’s really in integer value and not a float. If it’s a float parsing it to int will give a different result than the original value. If it’s int both will be the same.