CODEWITHSUNDEEP
c#wpfmvvmtextboxmultibinding
theAlse
theAlse

Reputation: 5747

Triggering a command from a textbox when enter is pressed?

Let me start by saying that I am new to MVVM, so please bare with be, if the question is unclear let me know and I will try to clarify.

I have correctly implemented a button in XAML with multibinding, the code is as follows:

<Button x:Name="licenceFilterSet" Content="Search License" Command="{Binding licenseSearchCommand}" Click="licenceFilterButtonClick" HorizontalAlignment="Right" Width="94">
    <Button.Resources>
        <local:SearchFilterConverter x:Key="SearchFilterConverter" />
    </Button.Resources>
    <Button.CommandParameter>
        <MultiBinding Converter="{StaticResource SearchFilterConverter}">
            <Binding Path="Text" ElementName="filterLicenseTextBox" />
            <Binding Path="IsChecked" ElementName="regularExpressionCheckBox" />
        </MultiBinding>
    </Button.CommandParameter>
</Button>

(the value of a textbox and a checkbox is sent to be proceed).

Now I would like to add the exact same feature to the textBox, where the user can directly press ENTER in the textBox and perform the same operation.

I tried the following code, but it seems that each character is now sent to the command, but I only want the command to be sent when the user presses ENTER. What should I change?

<TextBox Name="filterLicenseTextBox">
        <TextBox.Resources>
            <local:SearchFilterConverter x:Key="SearchFilterConverter" />
        </TextBox.Resources>

        <TextBox.Text>
            <MultiBinding Converter="{StaticResource SearchFilterConverter}">
                <Binding Path="Text" ElementName="filterLicenseTextBox" Mode="OneWay"/>
                <Binding Path="IsChecked" ElementName="regularExpressionCheckBox" Mode="OneWay"/>
            </MultiBinding>
        </TextBox.Text>
        <TextBox.InputBindings>
            <KeyBinding Key="Enter" Command="{Binding licenseSearchCommand}">
            </KeyBinding>
        </TextBox.InputBindings>
</TextBox>

Upvotes: 0

Views: 1402

Answers (1)

Noctis
Noctis

Reputation: 11763

The short answer would be:

use the IsDefault on the button:

<Button IsDefault="true" 
   Click= "licenceFilterButtonClick"
   Content="Search License" ... />

Now theEnter key is bound to this button Click, and if you hit Enter on any place in the window with the button, it'll work.

The (bit) long answer would be:

Have a look at this article, it explains the why (creating a default button), and you can use the cancel as well, once you understand how they work :)

Upvotes: 3

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