Get part of a string using jQuery

Question

HTML code:

How can I get number \"45\" of string using jQuery?

Answer 1

You don't need (or particularly want) jQuery for this (it's very useful for lots of other things, just not particularly for this). Straight JavaScript and DOM:

var div = document.getElementById('block-id-45');
var n = div.id.lastIndexOf('-');
var target = div.id.substring(n + 1);

Live example: http://jsbin.com/osozu

If you're already using jQuery, you can replace the first line with:

var div = $('#block-id-45')[0];

...but there's little if any reason to.