How to restrict the special characters being entered in text

Question

Hi How to restrict the special characters being entered in textbox (ASP.Net C#.Net jQuery). My Current Validation is working as expected [when user types in textbox] but the problem is it’s getting failed when user Copy Special Characters (#{}|) and Paste into the textbox then it’s not working. How can I prevent the user to Type/Copy Paste Special Characters into my Textbox ? Please assist me. Thanks.

Puneet Kankar · Answer

try this code and you also validate on button click event. $('input').on('keypress' function (event) { var regex = new RegExp(^[a-zA-Z0-9]+$); var key = String.fromCharCode(!event.charCode ? event.which : event.charCode); if (!regex.test(key)) { event.preventDefault(); return false; } });

issacpal · Answer

Easy way to restrict : $(function(){ $( #TextboxID ).bind( 'paste'function() { setTimeout(function() { //get the value of the input text var data= $( '#textInput' ).val() ; //replace the special characters to '' var dataFull = data.replace(/[^\w\s]/gi ''); //set the new value of the input text without special characters $( '#textInput' ).val(dataFull); }); }); }); or Follow this: function isNumber(evt) { evt = (evt) ? evt : window.event; var charCode = (evt.which) ? evt.which : evt.keyCode; if (charCode > 31 && (charCode 57)) { return false; } return true; } function filterInput() { var filtered = []; setTimeout(function(){ var data = document.querySelector('#mobile').value.split(''); for (var i = 0; i if (data[i] != ' ' && !isNaN(data[i])) { filtered.push(data[i]); } } document.querySelector('#mobile').value = filtered.join(''); } 100) }

Luqman Moideen · Answer

You can prevent it by using jquery $(document).ready(function () { $('#idOfTxtBox').bind(cut copy paste function (e) { e.preventDefault(); }); });

Midhun T P · Answer

Hi If you want to restrict pasting on your textbox you can write onpaste=return false on your textbox. Else if you want to remove only special characters from pasted text then please refer below thread - https://stackoverflow.com/questions/16782734/how-to-disable-special-characters-from-paste-in-a-textbox

Bryian Tan · Answer

If you post some code it could be helpful. I suspect something wrong with the client side validation maybe the code is using onKeyUp OnKeyDown or something to trigger the event. Here is a simple example that work with copy paste. http://jsfiddle.net/akhildave/Ry64u/2/