enter only characters numbers and special char not allowed if entered should not display in text box

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Hello,
I am working on a project in which there is a application form in which I want to enter only characters(a-z,A-Z). Numbers and special characters are not allowed. White space is allowed.If number is entered it should not display in text-box so anyone can help me.??

Posted 1-Apr-13 22:05pm

rgboss

Updated 27-Apr-18 2:00am

v3

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Comments

OriginalGriff 2-Apr-13 4:14am

Is this web or Winforms? The solution is different depending on where you are trying to run.

rgboss 2-Apr-13 7:06am

It is a web form....

5 solutions

Solution 1

There are a number of ways to do this.
You can use regex patterns, validator controls or just plain key down handling to achieve these results.

Simple key event handling example -

C#

private void txtInputNo_KeyPress(object sender, KeyPressEventArgs e)
        {
            e.Handled = (char.IsCharacter(e.KeyChar) || char.IsSpecial(e.KeyChar);

        }

The IsCharacter and IsSpecial methods check if the input character is either of the two.

Posted 1-Apr-13 22:16pm

Abhinav S

Solution 2

You can use regular expression to validate the entered text in javascript.
Hope these links may help you
http://www.advanced-javascript-tutorial.com/RegularExpressions.cfm#.UVqS10O6a1s[^]

your regular expression can be like this
var reSSN = /^[A-Za-z0-9 ]$/;

Posted 1-Apr-13 22:17pm

Naz_Firdouse

Updated 1-Apr-13 22:19pm

v2

Solution 3

Try this

C#

<script type="text/javascript">
        function Validate(event) {
            var regex = new RegExp("^[0-9a-zA-Z]+$");
            var key = String.fromCharCode(event.charCode ? event.which : event.charCode);
            if (!regex.test(key)) {
                event.preventDefault();
                return false;
            }
        }       
    </script> 
<asp:textbox id="txtDemo" onkeypress="return Validate(event);" runat="server" xmlns:asp="#unknown" />

Posted 1-Apr-13 23:30pm

pradiprenushe

Solution 4

You can use FilteredTextBox extender is you are using ASP.net Webform application.

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/FilteredTextBox/FilteredTextBox.aspx[^]

Posted 1-Apr-13 23:39pm

vijay__p

Comments

rgboss 2-Apr-13 7:12am

Thanks Vijay...

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Rahul Rajat Singh · Accepted Answer · 2013-04-02T01:24:00

Solution 5

This article shows how this can be done. In fact there is a reusable js file that can be included and used with any project to achieve this and many other common validation and filtration scenarios.

A Tiny Javascript Framework for Common Validation Scenarios.[^]

Posted 2-Apr-13 1:24am

Rahul Rajat Singh

Comments

rgboss 4-Apr-13 1:33am

Thanks Rahul.It was really helpful.