How to set value =0 when clear value of RadMaskCurrencyInput ?

[Umbala]

Hi telerik team!
How to set value =0 when clear value of RadMaskCurrencyInput ? (now it return nothing)
cases : 
    click button clear value : resolved
    Hold back key : ?
    Hold delete key: ?
thanks!

[Alex Fidanov]

Hello Umbala,

You can handle the ValueChanged event and set the value to zero, if the new value is null:

private void RadMaskedNumericInput_ValueChanged(object sender, Telerik.Windows.RadRoutedEventArgs e)
{
    if ((sender as RadMaskedNumericInput).Value == null)
    {
        (sender as RadMaskedNumericInput).Value = 0;
    }
}

Kind regards,
Alex Fidanov
the Telerik team

[Umbala]

thanks to Alex Fidanov  but I want when hold back key or hold delete key, value display in RadMaskCurrencyInput = 0 instead of displaying nothing

[Umbala]

???

[Tina Stancheva]

Hello Umbala,

Unfortunately the MaskedInput controls don't support this scenario. I logged this issue in our PITS under the name MaskedInput: When holding the Backspace and Delete keys, the Value property doesn't match the Text property and the item will be available for tracking in approximately 24hours. I also updated your Telerik account accordingly.

In the meantime you can try a couple of workarounds. You can handle the MaskedCurrencyInput.KeyUp() event and reset the control's Value whenever it is null or 0:

void currencyInput_KeyUp(object sender, KeyEventArgs e)
{
    RadMaskedCurrencyInput rmci = sender as RadMaskedCurrencyInput;
    if (e.Key == Key.Delete || e.Key == Key.Back)
    {
        if (rmci.Value == 0 || rmci.Value == null)
        {
            rmci.Value = null;
            rmci.Value = 0;
        }
    }
}

Or you can handle the MaskedCurrencyInput.ValueChanged() event to reset the control's Value again in case it is null or 0. But you will need to reset it in a Dispatcher:

private void RadMaskedCurrencyInput_ValueChanged(object sender, Telerik.Windows.RadRoutedEventArgs e)
{
    this.Dispatcher.BeginInvoke(new Action(() =>
    {
        if ((sender as RadMaskedCurrencyInput).Value == null)
        {
            (sender as RadMaskedCurrencyInput).Value = 0;
        }
    }));

}

All the best,
Tina Stancheva
the Telerik team

[CHRISTIAN]

i´ve implemented the suggested solution in the second post on a numericinput control.
but the control doesn´t fire the valuechanged event if the clear-button is clicked multiple times.
so the value still can get null. also my validation doesn´t work then.
any solution for that??

[CHRISTIAN]

*harrumph

[Alex Fidanov]

Hi CHRISTIAN,

The ValueChanged event will only fire when there is a change in the value. When you press it multiple times, the value does not change and stays null. What you can do, is to create your own Clear command and assign it to the control:

maskedInput.ClearCommand = new DelegateCommand((p) =>
{
    maskedInput.Value = null;
});

Greetings,
Alex Fidanov
the Telerik team

[federico]

as is done to clear the negative? if -1.0 then 0.0  (not -0.00)

 

[Milena]

Hi Federico,

To achieve the described behavior you can set AllowMinusOnZeroValue property of the Mask to False: 

<telerik:RadMaskedNumericInput
          maskedInput:MaskedInputExtensions.AllowMinusOnZeroValue="False"   />

You can find more information in this help article.

If the suggested approach does not work for you, could you please elaborate a bit more on your scenario by sending us a sample project or a code-snippet with the declaration of your MaskedInput. There are many combination, so for us is important to know: 
- do you use RadMaskedNumeric or RadMaskedCurrenctInput;
- the value the Mask property (which Mask token, it is bound or not);
- have you implement some of the suggested approaches here (on KeyUp, ValueChanged, ClearCommand).

Thank you in advance for you cooperation.

Regards,
Milena
Telerik