HTML DOM Legend用法及代码示例

DOM图例对象用于表示HTML <legend>元素。图例元素由getElementById()访问。

属性：

Form:它用于返回包含图例元素的表单的引用。

用法:

document.getElementById("ID">);

其中“id”是分配给“legend”标签的ID。

示例1：

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM Legend Object</title> 
    <style> 
        form { 
            width:50%; 
        } 
          
        label { 
            display:inline-block; 
            float:left; 
            clear:left; 
            width:90px; 
            margin:5px; 
            text-align:left; 
        } 
          
        input[type="text"] { 
            width:250px; 
            margin:5px 0px; 
        } 
          
        .gfg { 
            font-size:40px; 
            color:green; 
            font-weight:bold; 
        } 
    </style> 
</head> 
  
<body> 
    <div class="gfg">GeeksforGeeks</div> 
    <h2>DOM Legend object</h2> 
    <form> 
        <fieldset> 
            <!-- Assigning legend id -->
            <legend id="GFG">STUDENT::</legend> 
            <label>Name:</label> 
            <input type="text"> 
            <br> 
            <label>Email:</label> 
            <input type="text"> 
            <br> 
            <label>Date of birth:</label> 
            <input type="text"> 
            <br> 
            <label>Address:</label> 
            <input type="text"> 
            <br> 
            <label>Enroll No:</label> 
            <input type="text"> 
        </fieldset> 
    </form> 
    <br> 
    <button onclick="myGeeks()">Submit</button> 
    <script> 
        function myGeeks() { 
            
            // Accessing legend tag 
            var g = document.getElementById("GFG"); 
            g.style.color = "coral"; 
            g.style.fontSize = "20px"; 
        } 
    </script> 
</body> 
  
</html>

输出：

在单击按钮之前：

单击按钮后：

示例-2：可以使用document.createElement方法创建图例对象。

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM Legend Object</title> 
    <style> 
        form { 
            width:50%; 
        } 
          
        label { 
            display:inline-block; 
            float:left; 
            clear:left; 
            width:90px; 
            margin:5px; 
            text-align:left; 
        } 
          
        input[type="text"] { 
            width:250px; 
            margin:5px 0px; 
        } 
          
        .gfg { 
            font-size:40px; 
            color:green; 
            font-weight:bold; 
        } 
    </style> 
</head> 
  
<body> 
    <div class="gfg">GeeksforGeeks</div> 
    <h2>DOM Legend object</h2> 
    <form> 
        <fieldset id="GFG"> 
  
            <label>Name:</label> 
            <input type="text"> 
            <br> 
            <label>Email:</label> 
            <input type="text"> 
            <br> 
            <label>Date of birth:</label> 
            <input type="text"> 
            <br> 
            <label>Address:</label> 
            <input type="text"> 
            <br> 
            <label>Enroll No:</label> 
            <input type="text"> 
        </fieldset> 
    </form> 
    <br> 
    <button onclick="myGeeks()">Submit</button> 
    <script> 
        function myGeeks() { 
            // Legend object created  
            var g = document.createElement("LEGEND"); 
            var f = document.createTextNode("STUDENT:"); 
            g.appendChild(f); 
            document.getElementById("GFG").appendChild(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 Legend Object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 Legend Object。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。