以编程方式将元素拖放到另一个元素上

Question

使用jQuery UI,是否可以使用javascript执行拖放操作？

例子.单击链接后,将其#pony拖放到#box.我试过触发拖动事件,但这似乎不起作用:)

$('#pony').trigger('drag', [$('#box')]);

Answer 1

这就是jQuery UI团队以编程方式触发drop事件的方式.

droppable_events.js:

draggable = $( "#draggable1" ).draggable(),
droppable1 = $( "#droppable1" ).droppable( config ),
droppable2 = $( "#droppable2" ).droppable( config ),

droppableOffset = droppable1.offset(),
draggableOffset = draggable.offset(),
dx = droppableOffset.left - draggableOffset.left,
dy = droppableOffset.top - draggableOffset.top;

draggable.simulate( "drag", {
    dx: dx,
    dy: dy
});

该simulate函数在jquery.simulate.js中定义.简单来说,它将draggable移动到droppable上以触发drop事件.

总而言之,我们有以下片段.干杯.

$(function() {
  $("#draggable").draggable();
  $("#droppable").droppable({
    drop: function(event, ui) {
      console.log(event, ui);
      alert('dropped!');
    }
  });
});

function trigger_drop() {
  var draggable = $("#draggable").draggable(),
    droppable = $("#droppable").droppable(),

    droppableOffset = droppable.offset(),
    draggableOffset = draggable.offset(),
    dx = droppableOffset.left - draggableOffset.left,
    dy = droppableOffset.top - draggableOffset.top;

  draggable.simulate("drag", {
    dx: dx,
    dy: dy
  });
}

#draggable {
  width: 100px;
  height: 100px;
  padding: 0.5em;
  float: left;
  margin: 10px 10px 10px 0;
}
#droppable {
  width: 150px;
  height: 150px;
  padding: 0.5em;
  float: left;
  margin: 10px;
}
br {
  clear: both;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.3/themes/smoothness/jquery-ui.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.3/jquery-ui.min.js"></script>

<script src="https://rawgit.com/jquery/jquery-ui/1-11-stable/external/jquery-simulate/jquery.simulate.js"></script>


<div id="draggable" class="ui-widget-content">
  <p>Drag me to my target</p>
</div>

<div id="droppable" class="ui-widget-header">
  <p>Drop here</p>
</div>
<br>
<button onclick="trigger_drop()">trigger drop event</button>