带约束选项的拖放

描述

此选项用于限制可拖动的方向，无论是水平 还是垂直 。默认为 null，表示自由移动。

语法

以下是使用constraint 选项的简单语法。

new Draggable('element', {constraint:null, "horizontal" or "vertical"});

示例

实时演示 
<html>
   <head>
      <title>Draggables Elements</title>

      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      <script type = "text/javascript" src = "/javascript/scriptaculous.js"></script>

      <script type = "text/javascript">
         window.onload = function() {
            new Draggable('myimage', {constraint:"horizontal"});
         }
      </script>
   </head>
   
   <body>
      <p>Try to drag the following image and see the result and later
         change constraint to vertical and then repeat the exercise</p>

      <img id = "myimage" src = "/images/scriptaculous.gif"/>
   </body>
</html>

它将产生以下结果 −

scriptaculous_drag_drop.htm
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