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[Solved] Update custom filter on textchange

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GridView

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answered on 29 Jul 2010, 06:03 PM

Hello Berthold,

If you wish to make the RadGridView update while you are typing, you only need to set the UpdateSourceTrigger of the Binding in the ColumnHeader's TextBox to PropertyChanged like so:

<TextBox Grid.Column="0" Text="{Binding FilterDescriptor.Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch"/>

All the best,
Yavor Georgiev
the Telerik team

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answered on 30 Jul 2010, 09:20 AM

Hi Berthold,

Here is the source code for TextColumnHeader.xaml, with the small modification I told you about. You needn't modify anything else in the code to get this working. Just remember: you need to choose a filter first, only then will the GridView start searching when you type.

<local:ColumnFilterCell x:Class="Telerik.Windows.Controls.GridView.Filter.TextColumnHeader"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:telerikDrag="clr-namespace:Telerik.Windows.Controls.DragDrop;assembly=Telerik.Windows.Controls"

xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation"

xmlns:local="clr-namespace:Telerik.Windows.Controls.GridView.Filter">

<Border>

<Grid>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="*"/>

<ColumnDefinition Width="Auto"/>

</Grid.ColumnDefinitions>

<TextBox Grid.Column="0" Text="{Binding FilterDescriptor.Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Stretch"/>

<ContentControl Grid.Column="1" Content="{Binding FilterVisibility}">

<telerik:RadContextMenu.ContextMenu>

<telerik:RadContextMenu ItemsSource="{Binding FilterOperators}" EventName="MouseLeftButtonUp">

</telerik:RadContextMenu>

</telerik:RadContextMenu.ContextMenu>

</ContentControl>

</Grid>

</Border>

</local:ColumnFilterCell>

Greetings,
Yavor Georgiev
the Telerik team

answered on 30 Jul 2010, 10:22 AM

Hi Yavor,

thanks for your code, but the exception still occurred.

Even when I use your default project (ExampleCS_SL - downloaded a few days ago, Subproject: Gridview.Silverlight, Folder: CustomFilterRow) and add "UpdateSourceTrigger=PropertyChanged" to the Text-Binding the exception occurred when TextColumnHeader tries to initialize components

public TextColumnHeader()

{

InitializeComponent(); <-- Exception

}

At last I copied your whole xaml-code into this class - same behaviour.

Regards
Berthold

answered on 30 Jul 2010, 10:40 AM

Hello Berthold,

I apologize for misleading you, I was under the impression you were using WPF rather than Silverlight. In Silverlight, you need to handle the TextChanged event of the TextBox like so:

private void TextBox_TextChanged(object sender, System.Windows.Controls.TextChangedEventArgs e)

{

var box = sender as System.Windows.Controls.TextBox;

var expr = box.GetBindingExpression(System.Windows.Controls.TextBox.TextProperty);

expr.UpdateSource();

}

Regards,
Yavor Georgiev
the Telerik team