how to validate alphanumeric in javascript

Question

1.00/5 (1 vote)

See more:

I have a textbox and it need the user not allow to enter any specialcharecters He can enter

1. A-Z
2. a-z
3. 0-9
4. Space.

Posted 22-Aug-11 21:31pm

csaravanan28

Add a Solution

Comments

OriginalGriff 23-Aug-11 3:36am

Reason for my vote of one: too lazy to do basic research.

3 solutions

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)

OriginalGriff · Answer 1 · 2011-08-22T21:36:00

Solution 1

Google! A very simple search using "validate alphanumeric in javascript" copied from your question subject gave 1.3 million hits, most of then explaining exactly how to do it.

Please, try to do at least basic research your self in future...

Posted 22-Aug-11 21:36pm

OriginalGriff

CPallini · Answer 2 · 2011-08-22T21:45:00

Solution 2

It is time to learn both Javascript and regular expressions (and, in the spare time, have a look at the Q&A FAQ).

Posted 22-Aug-11 21:45pm

CPallini

Comments

Member 9435088 30-Oct-12 2:22am

DHARMENDRA HOW TO ALPHA BETHA VALIDATION URGENT

Uday P.Singh · Answer 3 · 2011-08-22T21:52:00

try this:

XML

<script type = "text/javascript">
function checkField(fieldname)
{
if (/[^0-9a-bA-B\s]/gi.test(fieldname.value))
{
alert ("Only alphanumeric characters and spaces are valid in this field");
fieldname.value = "";
fieldname.focus();
return false;
}
}
</script>

and call it like this:

HTML

<input type="text" name="name" id="name"  onblur="checkField(this)">