Prototype - 表單控制元件的 `getValue()` 方法

此方法返回表單控制元件的當前值。對於大多數控制元件，此方法返回字串，只有多選框會返回一個數組。此方法的全域性快捷鍵為 $F()。

語法

formElement.getValue();

返回值

返回字串或字串陣列。

示例

以下是展示控制元件如何接收焦點的示例：

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var value = $('age').getValue();
            alert("Returned value is : " + value );
         }
      </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>

輸出

prototype_form_management.htm

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