By 06/02/2014 15 Comments

How To Allow Only Alphanumeric Characters in an ASP.NET TextBox using jQuery

Only alphanumeric characters are allowed

  • We create a website which lets users to subscribe for news letters by entering their valid emails
  • We do not want any invalid symbol / character (e.g $*&()>?@|/\) entered by visitors in textbox
  • It can be easily achieved in using JQuery

The code shown bellow matches a regular expression /[^a-zA-Z0-9 ]/g that finds all characters that are not alphabets or numbers. If the user enters  a character that  is not an  alphabet or  number, the character is immediately replaced with an empty string.

Jquery Code snippet

<script type="text/javascript" src="Scripts/jquery-1.8.2.js"></script> <!--- import jquery library --->
        $(document).ready(function() { // method called, when document loaded by browser

            $('[id$="TT_TextBox1"]').bind('keyup blur', function() { // TT_TextBox1 called an method bind(), bind() method attaches one or more event handler for it, here bind() function attaches 2 event handlers keyup and blur, also pass un unknown function which will be called when these events will be fired

                if (this.value.match(/[^a-zA-Z0-9 ]/g)) { // check if user enter invalid characters
                    this.value = this.value.replace(/[^a-zA-Z0-9 ]/g, ''); // if true, replace those invalid characters into an space (specifies as a second argument from replace method)



ASP.NET Code snippet

<!--- Following code renders textbox and label control on browser --->

<asp:Label runat="server" Text="Try entering Non alphanumeric char"></asp:Label>

        <asp:TextBox ID="TT_TextBox1" runat="server" Text="" />

Posted in: ASP.NET, jQuery

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