HTML | DOM Column Object

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

document.getElementById("Col_ID");

This Col_ID is assigned to HTML < col > element.
Property Values:

span: Used to set or return span attribute.

Example-1: Returning “col id” using document.getElementById(“myCol”).id;

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        HTML | DOM Column Object
    </title>
</head>
<style>
    #myCol {
        background: green;
    }
     
    table {
        color: white;
        margin-left: 150px;
    }
     
    #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 Column Object</h2>
    <table>
        <colgroup>
            <col id="myCol" span="2">
                <col style="background-color:green">
        </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() {
            // Get the Id of Column Element
            var x = document.getElementById(
                "myCol").id;
            document.getElementById(
                "Geek_p").innerHTML = x;
        }
    </script>
</body>
 
</html>

Output

Before click on the button:

After click on the button:

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

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        HTML | DOM Column Object
    </title>
</head>
<style>
    #myCol {
        background: green;
    }
     
    table {
        color: white;
        margin-left: 150px;
    }
     
    #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 Column Object</h2>
    <table>
        <colgroup>
            <col id="myCol" span="2">
                <col style="background-color:green">
        </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() {
            // return the value of span attribute of Column element
            var x = document.getElementById(
                "myCol").span;
            document.getElementById(
                "Geek_p").innerHTML = x;
        }
    </script>
</body>
 
</html>