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Negative sign at the end

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NumericUpDown
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Patrick
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Patrick asked on 30 Sep 2016, 08:30 AM

Hello,

is it possible to accept that the negative sign is put at the end of the number, when editing?

For example: typing "55-" will enter "-55" and will be formatted correctly when the cursor leaves the control.

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Nasko
Telerik team
answered on 03 Oct 2016, 07:10 AM
Hello Patrick,

The desired by you functionality is not supported by RadNumericUpDown with its current implementation.

What we could suggest you is to consider using RadMaskedNumericInput  - it places the sign as expected while typing a number. So, when "55" is entered and after that "-" the input will be formatted as expected.

Hope this helps.

Regards,
Nasko
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Patrick
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answered on 04 Oct 2016, 05:06 AM

Hello Nasko,

I've just tried the RadNumericUpDown control, but I have problems with it.

The XAML code I'm using is the following:

<tk:RadMaskedNumericInput Value="-12345.67"
                                                              FormatString="#,###.00"
                                                               IsClearButtonVisible="False"
                         Mask=""
                         SelectionOnFocus="DefaultSelectAll"
                                         SpinMode="None"
                                                              maskedInput:MaskedInputExtensions.AllowMinusOnNullValue="True" />

If the control contains already a negative value (say "-1"), I enter it with a tab (the text is selected) and type "-2", the control displays "2".
If it contains "1" at the beginning, doing the same thing shows "-2".
This is completely counter-intuitive and leads to errors when entering values: if the old and new value are negative, I must enter a "-", but only after the first digit; if the old value is positive and the new one is negative, I can enter a "-" anywhere; if the new value is positive, never enter the "-".

Is it a bug in the control or something wrong with with properties?

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Dinko
Telerik team
answered on 06 Oct 2016, 11:21 AM
Hello Patrick,

The minus sign on the keyboard toggles the value from negative to positive and vice versa, regarding the caret position. If you want to clear the mask when its value is select all and the minus key is pressed you can override the HandleSubtractkey method of RadMaskedNumericInput.
public class NumericInputMinusClearsSelection : RadMaskedNumericInput
    {
        protected override bool HandleSubstractKey()
        {
            // Show Negative symnbol when all is selected.
            if (!string.IsNullOrEmpty(this.Text) && this.Text.Length == this.SelectionLength)
            {
                if (this.ClearCommand != null)
                {
                    this.ClearCommand.Execute(null);               
                }
 
                this.ToggleNegativeSignKey();
                return true;
            }
 
            return base.HandleSubstractKey();
        }
    }

We have SDK example in our GitHub repository showing the mentioned above approach. Give this project a try and let us know if it works for you.

Regards,
Dinko
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Nasko
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Patrick
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Dinko
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