CODEWITHSUNDEEP
wpfxaml
Yuval Peretz
Yuval Peretz

Reputation: 27

How can I make a Button stay disable conected to Textblock in XAML?

I have a TextBox that i want it to control a Button. that as long as nothing writen in the TextBox the Button will be dissabled.

Upvotes: 1

Views: 35

Answers (2)

d.moncada
d.moncada

Reputation: 17402

You can accomplish this all in XAML using a Style DataTrigger.

<TextBlock x:Name="myTextBlock" />
<Button>
    <Button.Style>
        <Style TargetType="Button">
            <Setter Property="IsEnabled" Value="True"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding Text.Length, ElementName=myTextBlock}" Value="0">
                    <Setter Property="IsEnabled" Value="False"/>
                </DataTrigger>
            </Style.Troggers>
        </Style>
    </Button.Style>
</Button>

Upvotes: 2

frenk91
frenk91

Reputation: 929

you have to use data binding and a converter

<TextBlock x:Name="textBlock" />
<Button IsEnabled="{Binding ElementName=textBlock, Path=Text, Converter={StaticResource TextToBoolConverter}}" />

and the converter looks like this:

 public class TextToBoolConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, string language)
        {
            var text = value as string;

            if (text.Length > 0)
            {
                return true;
            }

            return false;
        }

        public object ConvertBack(object value, Type targetType, object parameter, string language)
        {
            return value;
        }
    }

and this goes in your page:

<Page.Resources>
        <local:TextToBoolConverter x:Name="TextToBoolConverter" />
</Page.Resources>

Upvotes: 0

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