How to extend a jquery ui widget ? (1.7)

Question

I would like to create a custom version of the sortable widget. I have been searching for documentation, but could not find something really accurate. The best information I

Answer 1

I'm using this in order to predefine start, stop and update functions:

$.widget('ui.custom_sortable_or_any_other_name', $.ui.sortable, {
    _init: function() {
        this.element.children().css('position', 'relative'); //for example
    },
    options : {
        start: function (event, ui) {   
            ui.item.addClass('noclick'); //ui.item get's the item, that's my point
        },
        stop: function (event, ui) {            
        },
        update: function (event, ui) {
            $.ajax(); //some ajax you might want to do
        }
    }
});