Re: Listbox itemtemplate binding - WPF Discussion Boards

22-Oct-15 23:07

I want my button to be enable only when one item in listbox is checked else disable the button. how to achieve this? Any help please

<ListBox Name="listBoxDraftVersions" Height="200" Width="250" Margin="3" ItemsSource="{Binding DraftList}">
<ListBox.ItemTemplate>
<DataTemplate>
<Border x:Name="TheBorder" BorderBrush="Gray" BorderThickness="1" Padding="4" CornerRadius="4" Margin="2">
<CheckBox Name="radioButZone" Content="{Binding DraftName}" IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}, Path=IsSelected}"></CheckBox>
<Border.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="AliceBlue" Offset="0.15" />
<GradientStop Color="White" Offset="0.85" />
<GradientStop Color="Lavender" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

<Button Content="Load" IsDefault="True" x:Name="btnLoad" Style="{StaticResource MetroButton}" Click="btnLoad_Click" />

i tried
IsEnabled="{Binding ElementName=listBoxDraftVersions, Path=IsSelected}" not working

Gerry Schmitz23-Oct-15 7:55

Gerry Schmitz

23-Oct-15 7:55

Add a DataTrigger to your Button; e.g.

XML

<Button Content="Load"
                 IsDefault="True"
                 x:Name="btnLoad"
                 Click="btnLoad_Click">
            <Button.Style>
               <Style TargetType="Button">
                  <Style.Triggers>
                     <DataTrigger Binding="{Binding ElementName=listBoxDraftVersions, Path=SelectedItems.Count}"
                                  Value="0">
                        <Setter Property="IsEnabled"
                                Value="False" />
                     </DataTrigger>
                  </Style.Triggers>
               </Style>
            </Button.Style>
         </Button>

Saurabh18cs23-Oct-15 16:19

23-Oct-15 16:19

Hi Gerry,

Thanks for your quick reply , same thing is happening if i use
IsEnabled="{Binding ElementName=listBoxDraftVersions, Path=SelectedItems.Count}" on button.

But i want button to be enabled when only 1 checkboox is checked else it should be diabled if >1 and <1

Thanks and Regards

Gerry Schmitz23-Oct-15 17:21

Gerry Schmitz

23-Oct-15 17:21

"IsEnabled" is a bool; simply trying to bind it to SelectedItems.Count (an int) is not going work.

You might be able to use a "converter" in there ...

(Or just change the trigger to "enable" the button if the "count" is 1; using a default of "not enabled").

Saurabh18cs23-Oct-15 20:19

23-Oct-15 20:19

Hi Gregg,

In that case i am not able to select multiple checkboxes. i want to select multiple checkboxes also but using this cannnot select multiple only one is getting checked at one time.

Thanks

WPF ListBoxItem Quick Question

Gerry Schmitz24-Oct-15 5:35

Gerry Schmitz

24-Oct-15 5:35

To select multiple items, the "SelectionMode" for the ListBox should be set to "Multiple".

If you are going to ignore the "built-in" selection logic of the ListBox and associated items, then you will have to use your own custom code.

Your approach is wrong.

Your are using checkboxes to "select" items in a listbox; instead, you should simply use the checkbox to "display" the "selected" status of a given item and use the built-in selection logic as it was intended.

(Gary, Larry, Gerald, George and now Gregg ... My level of visibility is now tracking in the minus range).

Kevin Marois16-Oct-15 8:17

Kevin Marois

16-Oct-15 8:17

I'm trying to bind the ListBoxItem's IsSelected property to a property called 'IsItemSelected' on my base entity.

 <Style x:Key="listBoxItemContainerStyle"
           TargetType="ListBoxItem">

<pre>
    <Setter Property="IsSelected" Value="{Binding IsItemSelected}"/>

This isn't working. The selected item's IsItemSelected property is not being set.

What am I missing here?

Thanks

If it's not broken, fix it until it is

Re: WPF ListBoxItem Quick Question

J. Calhoun2-Nov-15 6:22

J. Calhoun

2-Nov-15 6:22

A couple of ideas, first what is the listbox items source? Make sure that the object in the items source should have a boolean property "IsItemSelected" and that would be the property that you bind the value to, not the view model.

I made a sample object that had two properties, string Name and bool IsItemSelected

I added that to an observable collection (yourList) and then I define the ListBox and the container style as such

HTML

<ListBox ItemSource="{Binding yourList}" DisplayMemberPath="Name">
    <ListBox.ItemContainerStyle>
        <Style TargetType="{x:Type ListBoxItem}">
            <Setter Property="IsSelected" 
                Value="{Binding IsItemSelected}"/>

If this is not working then the fault might be in your view model, things to make sure are are you implementing INotifyPropertyChanged? Is your event set up correctly? If this is still not working and you would like to post your view model I would be happy to help.

Cheers!

SelectionChanged event is not working

Ashfaque Hussain15-Oct-15 1:52

Re: SelectionChanged event is not working

15-Oct-15 1:52

I have one datagrid, inside that datagrid have taken one combobox. I am trying to create the SelectionChanged event for this combobox but its not working. Below is the code:

XML

<DataGridTemplateColumn.CellTemplate>
   <DataTemplate>
       <Grid>
            <StackPanel Orientation="Horizontal">
               <cc:MyComboBox Name="ddlDepositMode" Width="150"  ItemsSource="{Binding DataContext.ModeCollection, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" DisplayMemberPath="ModeName"  SelectedValuePath="ModeId" IsSynchronizedWithCurrentItem="False"  SelectedValue="{Binding Path=ModeId,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" SelectedItem="{Binding Path=ModeName, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Padding="3,0,0,0">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="SelectionChanged">
                            <i:InvokeCommandAction Command="{Binding DataConext.ModeTypeCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" />
                        </i:EventTrigger>
                     </i:Interaction.Triggers>
               </cc:MyComboBox>
            </StackPanel>
        </Grid>
   </DataTemplate>
</DataGridTemplateColumn.CellTemplate>

Richard Deeming15-Oct-15 2:48

Richard Deeming

15-Oct-15 2:48

Ashfaque Hussain wrote:
DataConext.ModeTypeCommand

Shouldn't that be DataContext.ModeTypeCommand?

If it still doesn't work, check the Output window in Visual Studio for binding errors.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Checkbox IsChecked property is not binding

Ashfaque Hussain14-Oct-15 2:01

14-Oct-15 2:01

I have taken checkbox on the header of the DataGrid, but Boolean property of IsChecked is binding.

XML

<DataGridTemplateColumn.HeaderTemplate>
                                           <DataTemplate>
                                               <StackPanel>
                                                   <!--<cc:MyLabel Content="{Binding Source={StaticResource localisation}, Mode=OneWay, Path=.[Resource.SELECT]}"></cc:MyLabel>-->
                                                   <cc:MyCheckBox Width="30" IsChecked="{Binding Path=MyViewModel.IsAllSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ></cc:MyCheckBox>
                                               </StackPanel>
                                           </DataTemplate>
                                       </DataGridTemplateColumn.HeaderTemplate>

Richard Deeming14-Oct-15 2:31

Richard Deeming

14-Oct-15 2:31

Check the output window in Visual Studio for binding errors.

The Path=MyViewModel.IsAllSelected doesn't look right. Does the DataContext for the grid's parent really have a property called MyViewModel? Are you sure it shouldn't just be Path=IsAllSelected?

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Ashfaque Hussain14-Oct-15 19:32

14-Oct-15 19:32

I have tried with all the possibilities for the Path property:
Path=DataContext.IsAllSelected
Path=IsAllSelected
Path=MyViewModel.IsAllSelected

none of these are working

Meshack Musundi14-Oct-15 23:54

Meshack Musundi

14-Oct-15 23:54

Try doing it like this,

XML

...
   <cc:MyCheckBox Width="30" IsChecked="{Binding Path=IsAllSelected, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}">
...

"As beings of finite lifespan, our contributions to the sum of human knowledge is one of the greatest endeavors we can undertake and one of the defining characteristics of humanity itself"

Ashfaque Hussain15-Oct-15 1:56

15-Oct-15 1:56

Thanks Meshack, but this approach is not working

Meshack Musundi15-Oct-15 3:10

Meshack Musundi

15-Oct-15 3:10

I overlooked something. It should be DataContext.IsAllSelected. This should work,

XML

<cc:MyCheckBox Width="30" IsChecked="{Binding Path=DataContext.IsAllSelected, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}">

"As beings of finite lifespan, our contributions to the sum of human knowledge is one of the greatest endeavors we can undertake and one of the defining characteristics of humanity itself"

WPF Binding Issue

Saurabh18cs12-Oct-15 17:55