RadDateInput different browsers,different behavior

[Elliott]

in IE, Safari and Chrome, the delete and backspace keys can be used to clear out data, especially bad data
in Firefox and Opera those keys are disabled

<telerik:RadDateInput id="del1" DateFormat="d" Width="92px" Height="18px" Font-Size="X-Small" Font-Names="Verdana" BorderWidth="1px" runat="server" >
    <ClientEvents OnKeyPress="del_keypress" />
    <ClientEvents OnError="date_input_error" />
</telerik:RadDateInput>

the scripts

function del_keypress(sender, eventArgs) {
    var whichCode = eventArgs.get_keyCode();
    if ((whichCode != 13) && ((whichCode < 47) || (whichCode > 57)))
        eventArgs.set_cancel(true);
}

function date_input_error(sender,args) {
    alert("Invalid Delivery Date");
    sender.set_value('');
    sender.focus();
}

[Maria Ilieva]

Hi Marianne,

Please note that the mentioned functionalities are inbuilt and you could use Delete or BackSpace buttons to delete the needed content without adding the client code you are using. Could you please elaborate on what exactly you need to achieve with the client script you are implementing so we could provide proper solution for all browsers.

Greetings,
Maria Ilieva
the Telerik team

[Elliott]

I go into a web page with a few RadDateInput controls
I enter a date into one of them
I then try to erase the box with either the delete key or the backspace
IE, Safari and Chrome let me - in Firefox and Opera the textbox is locked

[Edward]

WIth "bad data", do you mean invalid date? This can be caused by a bug that is already fixed according to the release notes:
http://www.telerik.com/products/aspnet-ajax/whats-new/release-history/q2-2012-sp1-version-2012-2-724.aspx 

Fixed: Invalid value of RadDateInput is not properly cleared on the client when EnableSingleInputRendering="true"

What version do you use?