javascript - jQuery 用户界面 : Before start draggable

Question

如何在 jQueryUI 开始拖动之前实现一个 before start 事件来更改可拖动元素在 DOM 中的位置和位置？

Answer 1

你可以扩展原型(prototype)方法:

SEE DEMO

var oldMouseStart = $.ui.draggable.prototype._mouseStart;
$.ui.draggable.prototype._mouseStart = function (event, overrideHandle, noActivation) {
    this._trigger("beforeStart", event, this._uiHash());
    oldMouseStart.apply(this, [event, overrideHandle, noActivation]);
};

$("#draggable").draggable({
    beforeStart: function () {
        console.log('beforeStart::');
    }
});