Date guessing

[TriZetto]

Hello,
If I enter "30/22/09" into the first control in this demo, it gets updated to be "9/30/2022" rather than displaying an error indicating the date is invalid. If I enter "9", it gets changed to "8/9/2009". Is there a way to disable this and just show this as an invalid date?
Thanks
-marcos

[Daniel]

Hello TriZetto,

You can cancel the ValueChanging event when the value is not considered as a valid date:

<script type="text/javascript">
    function valueChanging(sender, args)
    {
        if (new Date(args.get_newValue()) == "NaN")
            args.set_cancel(true);
    }
</script>

<telerik:RadDatePicker ID="RadDatePicker1" runat="server">
    <DateInput>
        <ClientEvents OnValueChanging="valueChanging" />
    </DateInput>
</telerik:RadDatePicker>

Regards,
Daniel
the Telerik team

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[TriZetto]

Thank you for your reply, but this does not change the behavior of the control. It still changes
"30/22/09" to "9/30/2022"
"9" to "8/9/2009"
"a4" to "9/30/2022"

To me the input is all invalid given the current culture, but I do not see a way of indicating this to the user.  In you suggested solution,
new Date(args.get_newValue()) for any of these answers results in a valid date (today's date).

I suppose in this event handler I can try to match the string with a date regular expression. But I am wondering if there is an alternative.
Thanks
-marcos

[Daniel]

Hello TriZetto,

You can handle such data by overriding the built-in date parser engine:

<script type="text/javascript">
    Telerik.Web.UI.RadDateInput.prototype.parseDate = function(value, baseDate)
    {
        if (new Date(value) != "NaN")
            return value;
    }
</script>

<telerik:RadDatePicker ID="RadDatePicker1" runat="server">
    <DateInput>
        <ClientEvents />
    </DateInput>
</telerik:RadDatePicker>

I hope this helps.

Kind regards,
Daniel
the Telerik team

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[sara r]

hi
i have a similar issue. but adding this

<script type="text/javascript">

Telerik.Web.UI.RadDateInput.prototype.parseDate = function(value, baseDate)

{

if (new Date(value) != "NaN")

return value;

}

</script>

causes a js error.
It doesnt solve the issue.
In the textbox if i enter 1/5/19 it automatically fills 01/05/2019. when i clear that and tried to enter some other invald date, it gives me the previously populated date ie, 01/05/2019.
Please help