don't allow user to write special characters in RadTextBox

[Mohammed]

Hi,
how can I disable the user to write special characters in RadTextBox ? 
I'm also using the EmptyMessage property.

I want something like ajax toolkit filter extender 

[Mohammed]

Hi my friends,
i found a solution for my case and would like to share it with you : 

<telerik:RadTextBox ID="rtxtSerialNo" runat="server" MaxLength="40" Width="198px"
SelectionOnFocus="SelectAll" >
         <ClientEvents OnKeyPress="OnKeyPressSerialText"/>
</telerik:RadTextBox>


function OnKeyPressSerialText(sender, eventArgs) {
            var char = eventArgs.get_keyCharacter();
	    //will allow just letters, numbers and "-" letter 
            var exp = /[^a-zA-Z0-9-]/g;
            if (exp.test(char)) {
                eventArgs.set_cancel(true);
            }
        }

[Mayur]

Hi Mohammed,

I used your solution it works. But in firefox browser when i try to edit the text using back button or delete button, the editing does not happen. Instead i have to select and over write.

any suggestions ?

[Princy]

Hi Manoj,

Modify the code as follows to achieve your scenario.

Javascript:

<script type="text/javascript">
function OnKeyPressSerialText(sender, eventArgs)
 {
  var code = eventArgs.get_keyCode();
  if (code == 8 || code == 46 || (36 < code <41)) // Checking whether the key pressed is backspace, Delete or One of the Arrow Keys.
  {
   return;
  }
  var char = eventArgs.get_keyCharacter();
  //will allow just letters, numbers and "-" letter
  var exp = /[^a-zA-Z0-9-]/g;
  if (exp.test(char))
  {
      eventArgs.set_cancel(true);
  }
 }
</script>

Hope this helps.

Thanks,
Princy.

[Mohammed]

Thanks Princy,

[Wayne]

Sorry I could not get this to work. Not calling the JS script. Is this also out of date as you don't have OnKeyPress its now ClientEvents-OnKeyPress.

Can you show this sample again with one aspx file and one js file.

Thank you

 

[Eyup]

Hello Wayne,

Please try changing the if condition as follows:

if (code == 8 || code == 46 || (36 < code && code < 41))

I am also sending a sample working web site as requested.

Regards,
Eyup
Progress Telerik

[Majeed]

Hi Mohammed,

this is not secured validation because If we disable the javascript from client browser than it will allow to enter restricted characetr in textbox

[Majeed]

Hello Eyup,

I am facing some problem like Using Javascript for validation to restrict some special characters but one of our end user entered special characters by stopping/disabled the javascript from client browser.

kindly suggest me any better solution.

 

Thanks,

Majeed Khan

[Eyup]

Hi Majeed,

Generally, for numeric input we suggest that RadNumericTextBox is used:
https://demos.telerik.com/aspnet-ajax/numerictextbox/overview/defaultcs.aspx

As for restricting some special symbols with RadTextBox, you can use javascript as with regular asp:TextBox. If this is not applicable for a specific user, I'm afraid this is not specifically related to Telerik and you can check discussions over the net for regular asp:TextBoxes or inputs on this matter and once you manage to achieve that, then you can use a similar logic for the RadTextBox as well.

Regards,
Eyup
Progress Telerik