How to Select a Random Element in jQuery

In jQuery adds its own selection filters. As with everything else in the library, you can also create your own. To do this simply add a new function to the $.expr[':'] object. You can see a slightly modified version of his code below:

(function($){
    var random = 0;

    $.expr[':'].random = function(a, i, m, r) {
        if (i == 0) {
            random = Math.floor(Math.random() * r.length);
        }
        return i == random;
    };

})(jQuery);

// This is how you use it:
$('li:random').addClass('glow');