jQuery UI：开始拖动之前 [英] jQuery UI : Before start draggable

问题描述

解决方案如何实现一个before start事件来改变在jQueryUI开始拖动之前可以拖动的元素的DOM中的位置和位置？方案

您可以扩展原型方法：

查看演示

  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 ::'）; 
} 
}）; 
  

How to implement a before start event to have a change to change the position and place in the DOM of the draggable element before jQueryUI start to drag?

解决方案

You could extent prototype method:

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::');
    }
});

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