simulate.js

(function($) {

    $.fn.simulateDragDrop = function (options) {
        return this.each(function () {
            new $.simulateDragDrop(this, options);
        });
    };

    $.simulateDragDrop = function (elem, options) {
        this.options = options;
        this.simulateEvent(elem, options);
    };

    $.extend($.simulateDragDrop.prototype, {
        simulateEvent: function (elem, options) {
            var $source = $(elem);
            var $target = $(options.dropTarget);
            var init_offset = $source.offset();
            var target_offset = $target.offset();
            init_offset.top += $source.height() / 2;
            init_offset.left += $source.width() / 2;
            target_offset.top += $target.height() / 2;
            target_offset.left += $target.width() / 2;

            /*Simulating drag start*/
            var type = 'mousedown';
            var event = this.createEvent(type, init_offset);
            this.dispatchEvent(elem, type, event);

            /*Simulating drop*/
            type = 'mousemove';
            this.dispatchEvent(elem, type, this.createEvent(type, {
                top: init_offset.top + 2,
                left: init_offset.left + 2
            }));
            this.dispatchEvent(elem, type, this.createEvent(type, target_offset));

            /*Simulating drag end*/
            type = 'mouseup';
            var dragEndEvent = this.createEvent(type, target_offset);
            this.dispatchEvent(elem, type, dragEndEvent);
        },
        createEvent: function (type, offset) {
            var event = document.createEvent("MouseEvents");
            event.initMouseEvent(type, true, true, window, 0, 0, 0,
                offset.left, offset.top, false, false, false, false, 0, null);

            return event;
        },
        dispatchEvent: function (elem, type, event) {
            if (elem.dispatchEvent) {
                elem.dispatchEvent(event);
            } else if ( elem.fireEvent ) {
                elem.fireEvent("on"+type, event);
            }
        }
    });

})(jQuery);