Sum textbox values using JavaScript

Last updated on December 3, 2021 by Mike Dalisay

A friend asked me how to sum textbox values using JavaScript? He wants to do this as he type the numbers.

Here’s a quick answer to that:

Give all your TextBoxes a class name and use the jQuery ‘keyup()’ and ‘each()’ methods to compute the sum.

HTML – a table where the product name and price TextBox is found.

<table>
    <tr>
        <td>Product Name</td>
        <td>Price</td>
    </tr>
     
    <tr>
        <td>MOBILE POWER BANK (2800MAH)</td>
        <td><input type='text' class='price' /></td>
    </tr>
     
    <tr>
        <td>DISNEY NECK REST PILLOW (CHIP)</td>
        <td><input type='text' class='price' /></td>
    </tr>
     
    <tr>
        <td></td>
        <td><input type='text' id='totalPrice' disabled /></td>
    </tr>
</table>

jQuery – methods we used include keyup, each and val. Read comments on code.

<script>
// we used jQuery 'keyup' to trigger the computation as the user type
$('.price').keyup(function () {
 
    // initialize the sum (total price) to zero
    var sum = 0;
     
    // we use jQuery each() to loop through all the textbox with 'price' class
    // and compute the sum for each loop
    $('.price').each(function() {
        sum += Number($(this).val());
    });
     
    // set the computed value to 'totalPrice' textbox
    $('#totalPrice').val(sum);
     
});
</script>

Complete Code:

<html>
    <head>
        <title>jQuery Sum Demo</title>
    </head>
<body>
 
<table>
    <tr>
        <td>Product Name</td>
        <td>Price</td>
    </tr>
     
    <tr>
        <td>MOBILE POWER BANK (2800MAH)</td>
        <td><input type='text' class='price' /></td>
    </tr>
     
    <tr>
        <td>DISNEY NECK REST PILLOW (CHIP)</td>
        <td><input type='text' class='price' /></td>
    </tr>
     
    <tr>
        <td></td>
        <td><input type='text' id='totalPrice' disabled /></td>
    </tr>
</table>
 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js "></script>
 
<script>
// we used jQuery 'keyup' to trigger the computation as the user type
$('.price').keyup(function () {
 
    // initialize the sum (total price) to zero
    var sum = 0;
     
    // we use jQuery each() to loop through all the textbox with 'price' class
    // and compute the sum for each loop
    $('.price').each(function() {
        sum += Number($(this).val());
    });
     
    // set the computed value to 'totalPrice' textbox
    $('#totalPrice').val(sum);
     
});
</script>
 
</body>
</html>

This post will be updated if any variation occurs. :)

Download Source Code
You can download all the code used in this tutorial for only $9.99 $5.55!
[purchase_link id=”12278″ text=”Download Now” style=”button” color=”green”]

Related Tutorials

We listed all our high quality full-stack web development tutorials here: Click here.

Thank you for learning from our post about Sum TextBox Values As You Type in jQuery.

Published
Categorized as jQuery

By Mike Dalisay

Hi, I'm Mike Dalisay, a coder and startup founder. Thank you for visiting codeofaninja.com! I'm also passionate about technology and enjoy sharing my experience and learnings online. Connect with me on Twitter, LinkedIn, Facebook, and Instagram.

Back to top