Set list of invalid characters

[Jacky Chau]

Is it possible to assign a list of invalid characters to a RadInput so the user can't even enter them into the textbox?

[Konstantin Petkov]

Hi Jacky,

The requested functionality is not provided by the control out-of-the-box but you can achieve that though the client-side OnKeyPress event.

I hope this helps!

Greetings,
Konstantin Petkov
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center

[tomekm]

It prevents me from using backspace or tab key on that field? Is there any work-around?

[Shinu]

Hello Rychu,

I also experienced same problem when I use Mozilla FireFox, its working fine in all the other browsers. A workaround for this would be check for the key code of Tab key and backspace as shown in the following approach. Give a try with this and see if it helps.

JavaScript:

<script type="text/javascript">
    function OnKeyPress(sender, eventArgs) {
        var c = eventArgs.get_keyCharacter();
        var re = /^[a-zA-Z]$/;
        var check = c.match(re);
        if (check != null || eventArgs.get_keyCode() == 8 || eventArgs.get_keyCode() == 9) {
            eventArgs.set_cancel(false);
        }
        else {
            eventArgs.set_cancel(true);
        }
    }
</script>

-Shinu.