HTML Label htmlFor用法及代碼示例

DOM標簽htmlFor屬性用於設置或返回<label>元素的for屬性的值。 For屬性定義將標記哪個表單元素。

用法:

它用於返回htmlFor屬性：
```
labelObject.htmlFor
```
它用於設置htmlFor屬性：
```
labelObject.htmlFor = id
```

屬性值：

id:它定義了應標記元素的id屬性。

返回值：它返回一個字符串值，該值表示將被標記的元素的ID。

示例1：演示如何返回屬性的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>

輸出：

在單擊按鈕之前：

單擊按鈕後：

示例2：演示如何設置htmlFor屬性的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>

輸出：

在單擊按鈕之前：

單擊按鈕後：

支持的瀏覽器：下麵列出了DOM標簽htmlFor Property支持的瀏覽器：

穀歌瀏覽器
IE瀏覽器
Firefox
Opera
Safari

相關用法

注：本文由純淨天空篩選整理自ManasChhabra2大神的英文原創作品 HTML | DOM Label htmlFor Property。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。