当使用嵌套的 droppable 时 — 例如,您可以有一个树形的可编辑的目录结构,带有文件夹和文档节点 — greedy 选项设置为 true 来防止当 draggable 被放置在子节点(droppable)上时的事件传播。

请拖拽我到目标

外部 droppable

内部 droppable(不带有 greedy)

外部 droppable

内部 droppable(带有 greedy)

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery UI 放置(Droppable) - 防止传播</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
  <script src="//code.jquery.com/jquery-1.9.1.js"></script>
  <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
  <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css">
  <style>
  #draggable { width: 100px; height: 40px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
  #droppable, #droppable2 { width: 230px; height: 120px; padding: 0.5em; float: left; margin: 10px; }
  #droppable-inner, #droppable2-inner { width: 170px; height: 60px; padding: 0.5em; float: left; margin: 10px; }
  </style>
  <script>
  $(function() {
    $( "#draggable" ).draggable();
 
    $( "#droppable, #droppable-inner" ).droppable({
      activeClass: "ui-state-hover",
      hoverClass: "ui-state-active",
      drop: function( event, ui ) {
        $( this )
          .addClass( "ui-state-highlight" )
          .find( "> p" )
            .html( "Dropped!" );
        return false;
      }
    });
 
    $( "#droppable2, #droppable2-inner" ).droppable({
      greedy: true,
      activeClass: "ui-state-hover",
      hoverClass: "ui-state-active",
      drop: function( event, ui ) {
        $( this )
          .addClass( "ui-state-highlight" )
          .find( "> p" )
            .html( "Dropped!" );
      }
    });
  });
  </script>
</head>
<body>
 
<div id="draggable" class="ui-widget-content">
  <p>请拖拽我到目标</p>
</div>
 
<div id="droppable" class="ui-widget-header">
  <p>外部 droppable</p>
  <div id="droppable-inner" class="ui-widget-header">
    <p>内部 droppable(不带有 greedy)</p>
  </div>
</div>
 
<div id="droppable2" class="ui-widget-header">
  <p>外部 droppable</p>
  <div id="droppable2-inner" class="ui-widget-header">
    <p>内部 droppable(带有 greedy)</p>
  </div>
</div>
 
 
</body>
</html>