拖放（Drag & Drop）

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2023-12-01

拖放功能是为使开发人员的任务变得简单而添加的强大功能之一。实际上，拖动操作是某个UI元素上的单击手势，同时按住鼠标按钮并移动鼠标。在拖动操作后释放鼠标按钮时发生放下操作。

语法 (Syntax)

将拖放类添加到可拖动目标。

var dd = Ext.create('Ext.dd.DD', el, 'imagesDDGroup', {
   isTarget: false
});

将拖放目标类添加到可拖放目标。

var mainTarget = Ext.create('Ext.dd.DDTarget', 'mainRoom', 'imagesDDGroup', {
   ignoreSelf: false
});

例子 (Example)

以下是一个简单的例子。

<!DOCTYPE html>
<html>
   <head>
      <link href = "https://cdnjs.cloudflare.com/ajax/libs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css" 
         rel = "stylesheet" />
      <script type = "text/javascript" 
         src = "https://cdnjs.cloudflare.com/ajax/libs/extjs/6.0.0/ext-all.js"></script>
      <script type = "text/javascript">
         Ext.application ({
            launch: function() {
               var images = Ext.get('images').select('img');
               Ext.each(images.elements, function(el) {
                  var dd = Ext.create('Ext.dd.DD', el, 'imagesDDGroup', {
                     isTarget: false
                  });
               });
            }
         }); 
         var mainTarget = Ext.create('Ext.dd.DDTarget', 'mainRoom', 'imagesDDGroup', {
            ignoreSelf: false
         });
      </script>
      <style>
         #content {
            width:600px;
            height:400px;
            padding:10px;
            border:1px solid #000;
         }
         #images {
            float:left;
            width:40%;
            height:100%;
            border:1px solid Black;
            background-color:rgba(222, 222, 222, 1.0);
         }
         #mainRoom {
            float:left;
            width:55%;
            height:100%;
            margin-left:15px;
            border:1px solid Black;
            background-color:rgba(222, 222, 222, 1.0);
         }
         .image {   
            width:64px;
            height:64px;
            margin:10px;
            cursor:pointer;
            border:1px solid Black;
            display: inline-block;
         }
      </style>
   </head>
   <body>
      <div id = "content">   
         <div id = "images"> 
            <img src = "/extjs/images/1.jpg" class = "image" />
            <img src = "/extjs/images/2.jpg" class = "image" />
            <img src = "/extjs/images/3.jpg" class = "image" />
            <img src = "/extjs/images/4.jpg" class = "image" />
            <img src = "/extjs/images/5.jpg" class = "image" />
            <img src = "/extjs/images/6.jpg" class = "image" />
            <img src = "/extjs/images/7.jpg" class = "image" />
            <img src = "/extjs/images/8.jpg" class = "image" />
         </div>
         <div id = "mainRoom"></div>
      </div>
   </body>
</html>

借助Extjs中的拖放功能，我们可以将数据从网格移动到网格，将网格移动到网格中。以下是在网格和表单之间移动数据的示例。

拖放 - 网格到网格

拖放 - 网格到表格