java script for textbox in asp.net

Question

1.33/5 (3 votes)

See more:

Javascript

Hi Sir

how to write regular expression for text box should not accept spaces and should not accept alpha....

Posted 7-Aug-12 2:48am

skpraveenkumar

Add a Solution

Comments

Sergey Alexandrovich Kryukov 7-Aug-12 12:26pm

Did you simply read Regex reference or tutorial? The problem is too simple.
--SA

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2012-08-07T06:32:00

You can make a Regular Expression for that of course, and that is very simple, but in your particular case, very simple one, it's much better to filter out unwanted keystrokes while the user types the text.

This is a simple code sample:
Here is how to filter out:

HTML

<html>
   <head>
      <script type="text/javascript"><!--
         function filterDigits(eventInstance) { 
            eventInstance = eventInstance || window.event;
                key = eventInstance.keyCode || eventInstance.which;
            if ((47 < key) && (key < 58) || key = 45 || key == 8) {
               return true;
            } else {
                    if (eventInstance.preventDefault) eventInstance.preventDefault();
                    eventInstance.returnValue = false;
                    return false;
            } //if
         } //filterDigits
      --></script>
   </head>
<body">

<input type="text" onkeypress="filterDigits(event)"/>

</body>
</html>

Pay attention for the character #8. This is a backspace, which you should allow for input specifically. You can modify this code to allow characters of your choice.

—SA