How to Append Header to a HTML Table in JavaScript ?
Last Updated :
01 Feb, 2024
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JavaScript allows us to dynamically modify the structure of a table based on user interaction or other dynamic events. Here we will use JavaScript to dynamically create a Header row and then append it to the HTML table.
Approach
In this approach, we are using create elements along with DOM manipulation. we will follow these steps:
- Create the HTML table: Set up the basic HTML structure with a table containing existing headers and rows. Add a button element with a unique ID to trigger the header appending functionality.
- Include the Styling: Optionally, apply CSS styles for better presentation. In this example, we have added simple styling to the table and button.
- Set Up JavaScript Event Handling: Use JavaScript to get the table element by its ID. Add an event listener to the button to respond to clicks by DOM manipulation.
- Define the JavaScript Logic for Appending Headers: Inside the event listener function we will use these-
- Create a new header row (
trelement). - Create individual header cells (
thelements) with desired text content. - Append the header cells to the header row.
- Append the new header row to the
theadsection of the table.
- Create a new header row (
Example: This example shows the implementation of the above-explained approach.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content=
"width=device-width">
<title>Header Appended in
HTML table using JS</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
height: 100%;
width: 100%;
}
table,
td,
th {
border: 2px solid black;
padding: 5px;
font-size: 15px;
font-weight: 800;
font-family: sans-serif;
}
#appendHeaderButton {
margin: 5px 80px;
background-color: #dfdfdf;
padding: 10px 20px;
border-radius: 16px;
font-size: 10px;
font-weight: 600;
}
</style>
</head>
<body>
<table id="myTable">
<thead>
<tr>
<th>I Column</th>
<th>II Column</th>
<th>III Column</th>
</tr>
</thead>
<tbody>
<tr>
<td>cell (1,1)</td>
<td>cell (1,2)</td>
<td>cell (1,3)</td>
</tr>
<tr>
<td>cell (2,1)</td>
<td>cell (2,2)</td>
<td>cell (2,3)</td>
</tr>
<tr>
<td>cell (3,1)</td>
<td>cell (3,2)</td>
<td>cell (3,3)</td>
</tr>
</tbody>
</table>
<!-- Add a button with an ID for JavaScript to reference -->
<button id="appendHeaderButton">Append Header</button>
<script>
//Get the table by its ID
var table = document.getElementById("myTable");
// Add an event listener to the button
document.getElementById("appendHeaderButton")
.addEventListener("click", function () {
// new header row creation
let headerRow = document.createElement("tr");
let headerCell1 = document.createElement("th");
headerCell1.textContent = "New Header I";
let headerCell2 = document.createElement("th");
headerCell2.textContent = "New Header II";
let headercell3 = document.createElement("th");
headercell3.textContent = "New Header III";
// Add header cells to the header row
headerRow.appendChild(headerCell1);
headerRow.appendChild(headerCell2);
headerRow.appendChild(headercell3);
// Append the new header row to the table.
table.getElementsByTagName("thead")[0]
.appendChild(headerRow);
});
</script>
</body>
</html>
Output:
