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HTML | DOM ColumnGroup Object

  • Last Updated : 24 Nov, 2021

The ColumnGroup Object in HTML DOM is used to represent the HTML < colgroup > element. 
This tag is used to set or get the properties of <colgroup> element. It can be accessed by using getElementById() method.
Syntax: 
 

document.getElementById("ColGroup_ID");

This ColGroup_ID is assigned to HTML < colgroup > element.
Property Value: 
 

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  • span: Used to set or return the value of the span attribute.

Example-1: Returning “ColumnGroup id” using document.getElementById(“myColGroup”).id; 
 

html




<!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>

Output: 
 



  • Before clicking on the button: 
     

 

  • After clicking on the button: 
     

 

Example-2: Returning number of span element from “colgroup id” using document.getElementById(“myColGroup”).span; 
 

html




<!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>

Output 
 

  • Before clicking on the button: 
     

  • After clicking on the button: 
     

 

Supported Browsers: 
 

  • Google Chrome
  • Mozilla Firefox
  • Edge
  • Safari
  • Opera

 




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