How to check if a jQuery UI plugin is attached to an element?

Question

How can I check to see if a jQuery UI plugin is attached to an element? For example, if I load up the .sortable widget, how can its presence be determined?

The purpo

Answer 1

Just call an instance of sortable, if return undefined, then is not loaded

if (typeof $("ul.sortable").sortable('instance') != 'undefined') {
    //$.ui.sortable is loaded and called
} else {
    //call sortable
}