原型-Form.Element Focus() 方法

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此方法使元素获得键盘焦点。

语法

formElement.focus();

返回值

它返回一个 HTML 元素。

示例

下面是一个示例，展示一个控件如何接收焦点 −

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"> </script>
      
      <script>
         function showResult() {
            Form.Element.focus('age');
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      <br />

      <form id = "example" action = "#" onsubmit = "return false">
         <fieldset>
            <legend>User info</legend>
            <div>
               <label for = "username">Username:</label> 
               <input name = "username" id = "username" value = "Sai" type = "text">
            </div>
            <div>
               <label for = "age">Age:</label> 
               <input name = "age" id = "age" value = "23" size = "3" type = "text">
            </div>
            <div>
               <label for = "hobbies">Your hobbies :</label>
               <select name = "hobbies" id = "hobbies" multiple = "multiple">
                  <option>coding</option>
                  <option>swimming</option>
                  <option>hiking</option>
                  <option>drawing</option>
               </select>
            </div>
         </fieldset>
      </form>
      <br />
      
      <input type = "button" value = "Toggle" onclick = "showResult();"/>
   </body>
</html>

输出

prototype_form_management.htm
打印页面
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