HTML Label htmlFor用法及代码示例

DOM标签htmlFor属性用于设置或返回<label>元素的for属性的值。 For属性定义将标记哪个表单元素。

用法:

它用于返回htmlFor属性：
```
labelObject.htmlFor
```
它用于设置htmlFor属性：
```
labelObject.htmlFor = id
```

属性值：

id:它定义了应标记元素的id属性。

返回值：它返回一个字符串值，该值表示将被标记的元素的ID。

示例1：演示如何返回属性的HTML程序。

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM Label htmlFor Property 
  </title> 
  
    <style> 
        body { 
            font-size:20px; 
        } 
    </style> 
</head> 
  
<body style="text-align:center"> 
  
    <h1 style="color:green">GeeksforGeeks 
  </h1> 
    <h2>DOM Label htmlfor Property</h2> 
  
    <form> 
  
        <!-- Starts label tag from here -->
        <label for="student" 
               id="GFG"> 
            Student 
        </label> 
        <input type="radio" 
               name="Occupation" 
               id="student" 
               value="student"> 
        <br> 
  
        <label for="business"> 
            Business 
        </label> 
        <input type="radio" 
               name="Occupation" 
               id="business"
               value="business"> 
        <br> 
  
        <label for="other"> 
            Other 
        </label> 
        <!-- Ends label tags here -->
  
        <input type="radio" 
               name="Occupation" 
               id="other" 
               value="other"> 
    </form> 
    <br> 
    <button onclick="myGeeks()">Submit 
  </button> 
    
    <p id="sudo"></p> 
    <script> 
        function myGeeks() { 
            
            // Return htmlfor property. 
            var g =  
            document.getElementById("GFG").htmlFor; 
            document.getElementById("sudo").innerHTML =  
              g; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

单击按钮后：

示例2：演示如何设置htmlFor属性的HTML程序。

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM Label htmlFor Property 
  </title> 
  
    <style> 
        body { 
            font-size:20px; 
        } 
    </style> 
</head> 
  
<body style="text-align:center"> 
  
    <h1 style="color:green">GeeksforGeeks 
  </h1> 
    
    <h2>DOM Label htmlfor Property</h2> 
  
    <form> 
  
        <!-- Starts label tag from here -->
        <label for="student" 
               id="GFG"> 
            Student 
        </label> 
        <input type="radio" 
               name="Occupation" 
               id="student" 
               value="student"> 
        <br> 
  
        <label for="business"> 
            Business 
        </label> 
        <input type="radio"
               name="Occupation" 
               id="business" 
               value="business"> 
        <br> 
  
        <label for="other"> 
            Other 
        </label> 
        <!-- Ends label tags here -->
  
        <input type="radio" 
               name="Occupation"
               id="other"
               value="other"> 
    </form> 
    <br> 
    <button onclick="myGeeks()">Submit 
  </button> 
    
    <p id="sudo"></p> 
    <script> 
        function myGeeks() { 
            
            // Set htmlfor property. 
            var g =  
           document.getElementById("GFG").htmlFor =  
                "Employes" 
            document.getElementById("sudo").innerHTML =  
          "The value of the For attribute was " 
            "changed from student to " + g; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

单击按钮后：

支持的浏览器：下面列出了DOM标签htmlFor Property支持的浏览器：

谷歌浏览器
IE浏览器
Firefox
Opera
Safari

相关用法

注：本文由纯净天空筛选整理自ManasChhabra2大神的英文原创作品 HTML | DOM Label htmlFor Property。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。