HTML DOM ColumnGroup用法及代碼示例

HTML DOM中的ColumnGroup對象用於表示HTML <colgroup>元素。此標記用於設置或獲取<colgroup>元素的屬性。可以使用getElementById()方法進行訪問。

用法:

document.getElementById("ColGroup_ID");

此ColGroup_ID分配給HTML <colgroup>元素。

屬性值：

span:用於設置或返回span屬性的值。

示例1：使用document.getElementById(“myColGroup”).id返回“ColumnGroup id”；

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        HTML | DOM ColumnGroup Object 
    </title> 
</head> 
<style> 
    #myColGroup { 
        background:green; 
    } 
      
    table { 
        color:white; 
        margin-left:180px; 
        background:yellow; 
    } 
      
    #Geek_p { 
        color:green; 
        font-size:30px; 
    } 
      
    td { 
        padding:10px; 
    } 
</style> 
  
<body style="text-align:center;"> 
  
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
  
    <h2>HTML | DOM ColumnGroup Object</h2> 
    <table> 
        <colgroup id="myColGroup" span="2"> 
        </colgroup> 
        <tr> 
            <th>S.No</th> 
            <th>Title</th> 
            <th>Geek_id</th> 
        </tr> 
        <tr> 
            <td>Geek_1</td> 
            <td>GeekForGeeks</td> 
            <th>Geek_id_1</th> 
        </tr> 
        <tr> 
            <td>Geek_2</td> 
            <td>GeeksForGeeks</td> 
            <th>Geek_id_2</th> 
        </tr> 
    </table> 
    <br> 
    <button onclick="myGeeks()"> 
        Click 
    </button> 
    <h4> 
            <p id="Geek_p" style="color:green"></p> 
        </h4> 
    <script> 
        function myGeeks() { 
            // access ColumnGroup element 
            var x = document.getElementById("myColGroup").id; 
            document.getElementById("Geek_p").innerHTML = x; 
        } 
    </script> 
</body> 
  
</html>

輸出：

在單擊按鈕之前：
單擊按鈕後：

示例-2：使用document.getElementById(“myColGroup”).span從“colgroup id”返回span元素的數目；

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        HTML | DOM ColumnGroup Object 
    </title> 
</head> 
<style> 
    #myColGroup { 
        background:green; 
    } 
      
    table { 
        color:white; 
        margin-left:180px; 
        background:yellow; 
    } 
      
    #Geek_p { 
        color:green; 
        font-size:30px; 
    } 
      
    td { 
        padding:10px; 
    } 
</style> 
  
<body style="text-align:center;"> 
  
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
  
    <h2>HTML | DOM ColumnGroup Object</h2> 
    <table> 
        <colgroup id="myColGroup" span="2"> 
        </colgroup> 
        <tr> 
            <th>S.No</th> 
            <th>Title</th> 
            <th>Geek_id</th> 
        </tr> 
        <tr> 
            <td>Geek_1</td> 
            <td>GeekForGeeks</td> 
            <th>Geek_id_1</th> 
        </tr> 
        <tr> 
            <td>Geek_2</td> 
            <td>GeeksForGeeks</td> 
            <th>Geek_id_2</th> 
        </tr> 
    </table> 
    <br> 
    <button onclick="myGeeks()"> 
        Click 
    </button> 
    <h4> 
            <p id="Geek_p" style="color:green"></p> 
        </h4> 
    <script> 
        function myGeeks() { 
            // access ColumnGroup element 
            var x = document.getElementById("myColGroup").span; 
            document.getElementById("Geek_p").innerHTML = x; 
        } 
    </script> 
</body> 
  
</html>

輸出

在單擊按鈕之前：
單擊按鈕後：

支持的瀏覽器：

穀歌瀏覽器
火狐瀏覽器
Edge
Safari
Opera

相關用法

注：本文由純淨天空篩選整理自PranchalKatiyar大神的英文原創作品 HTML | DOM ColumnGroup Object。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。