Count Number of Rows in Table using JavaScript

In this tutorial we will see how to Count Number of Rows in Table using JavaScript. The JavaScript .rows property and JavaScript String length Property is used for this.

HTML Code

HTML Code is given below, This code contains simple HTML Table with 4 Rows.

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initialscale=1.0">
<title>Count Number of Rows in Table using JavaScript</title>
</head>
<body>
<table id="table1" border="1">
<tr>
<th>Name</th>
<th>Used For</th>
</tr>
<tr><td>HTML</td><td>Front End</td></tr>
<tr><td>CSS</td><td>Front End</td></tr>
<tr><td>PHP</td><td>Back End</td></tr>
</table>
</body>
</html>

JavaScript .rows property

The JavaScript .rows property returns the collection of all rows or all tr elements present inside the selected table.

The rows property is read only property and it is supported by all major browsers.

JavaScript String length Property

The JavaScript String length Property is used to get the length of the string. In this example it will return the number of rows that are returned by rows property.

The JavaScript String length Property is supported by all major browsers.

JavaScript Code

In this example, table is selected using getElementById method and then the number of rows present in the table is obtained using rows property. The .length property is used to count these number of rows. The answer is then displayed using alert function.

Take a look at the code given below.

<script>
var a = document.getElementById("table1");
var rows = a.rows.length;
alert("Number of Rows are: "+ rows);
</script>

Demo

Video Tutorial

Watch video tutorial on how to Count Number of Rows in Table using JavaScript.

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