Question

I use this inside my scripts:

$.fn.dataTableExt.oSort['title-numeric-asc']  = function(a,b) {
    var x = a.match(/title="*(-?[0-9\.]+)/)[1];
    var y = b.match(/title="*(-?[0-9\.]+)/)[1];
    x = parseFloat( x );
    y = parseFloat( y );
    return ((x < y) ? -1 : ((x > y) ?  1 : 0));
};

datatableExt comes from this:
http://datatables.net/download/build/jquery.dataTables.js

Sometimes i include “jquery.dataTables.js” sometimes I don’t.
So I want to add this plugin if datatables code is included.
How can I check?
Is it something like (typeof fn.dataTableExt != 'undefined')

Answer 1

I think it’s as simple as

if (!$.fn.dataTableExt) {
    alert('does not exist');
} else {
    alert('does exist');
}