Create Slug URL using Javascript

javascript-string-replace-space-with-dash.js

/* Javascript string replace spaces with dash using replace() */ 

/*
* Allowed only lower case letters (a-z)
* Here, the Regular expression is /\s+/g. 
*/

$('#slug-url').bind('keyup blur', function() {
        var $th = $(this);
        $th.val($th.val().replace(/(\s{2,})|[^a-z ']/g, ' '));
        $th.val($th.val().replace(/\s+/g, '-'));
        $th.val($th.val().replace(/^\s*/, ''));
 });