Share on Google+Share on Google+

JavaScript onkeypress event

This page discusses - JavaScript onkeypress event

JavaScript onkeypress event


This section illustrates you the use of onkeypress event in JavaScript.

In the given example, we are going to show you how to restrict the user to enter any number into the input field. For this purpose, we have created a text field. On pressing the key to write the text on the textbox, you will see that it will take only characters, not the numbers. This is possible by using the onkeypress event. It occurs when a keyboard key is pressed or held down.

Here is the code:

<h2>Textbox showing onkeypress event</h2>
<script type="text/javascript">
function valid(e){
var num;
var chars;
var check;
num = e.keyCode;
else if(e.which){
num = e.which;
chars = String.fromCharCode(num);
check = /\d/;
return !check.test(chars);
Enter text: <input type="text" onkeypress="return valid(event)"/>

On pressing the key, only characters get inserted in the text field:

Download Source Code:




Posted on: April 18, 2011 If you enjoyed this post then why not add us on Google+? Add us to your Circles

Share this Tutorial Follow us on Twitter, or add us on Facebook or Google Plus to keep you updated with the recent trends of Java and other open source platforms.

Discuss: JavaScript onkeypress event  

Post your Comment

Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image