How to allow alphanumeric in txtbox using javascript in ASP.NET C#?

Question

1.00/5 (1 vote)

See more:

I have one textbox thats allow alphanumeric if user enters symbols show the alert message
'You have enter symbol do you want to continue'
 'yes/no
 
If click yes symbol is allowed.if click no symbol is not allowed.

What I have tried:

I have tried some javascript this script not allowed to enter symbols.

Posted 5-Jun-17 19:42pm

Raja Ganapathy

Updated 5-Jun-17 23:15pm

Add a Solution

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)

madhav_jain · Accepted Answer · 2017-06-05T23:15:00

User Below code

function AllowAlphaNumeric() {
           var bool = check(document.getElementById("textbox").value);
           if (bool)
           {
               var r = confirm("You have enter symbol do you want to continue");
               if (r == false) {
                   document.getElementById("TEXTBOX").value = "";
               }
           }
       }
       function check(string) {
           var format = /[!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?]/;

           if (format.test(string)) {
               return true;
           } else
               return false;
       }