RadComboBox Text Property Binding MVVM

[GVera]

Hi,

I am having a hard time figuring out how to make the Text property of the RadComboBox bind to a string property in my View Model.  I have a combo box that is Editable so that user can search for anything that starts with the values typed on the text box.  I want to get that value in the view model, use it as part of a LINQ query (sarts with), and fill a collection source to display on a view.

The problem:
------------------
The string property on my view model "SearchText" is returning null (never gets the value entered by user).  Sample code is below:

        private List<SupplierMaster> foundSuppliers;
        public List<SupplierMaster> FoundSuppliers
        {
            get { return foundSuppliers; }
            set { if (foundSuppliers == value) return; foundSuppliers = value; OnPropertyChanged("FoundSuppliers"); }
        }

        private string searchText;
        public string SearchText
        {
            get { return searchText; }
            set { if (searchText == value) return; searchText = value; OnPropertyChanged("SearchText"); }
        }

        private void Search()
        {
                FoundSuppliers = (from sm in SupplierMaster where sm.SupplierName.ToUpperInvariant().StartsWith(SearchText.ToUpperInvariant()) select sm).ToList();    //Here the SearchText property is always null **ISSUE**
                FoundSuppliers = FoundSuppliers.OrderBy(n => n.SupplierName).ToList();            }
        }


XAML:

                        <telerik:RadComboBox Height="23" Name="txtSearchBox" TabIndex="1" HorizontalAlignment="Left"
                                         Width="246" IsEnabled="True" VerticalAlignment="Top" IsEditable="True" IsTextSearchEnabled="True"
                                         IsTextSearchCaseSensitive="True"  Text="{Binding SearchText}"
                                         TextSearchMode="StartsWithCaseSensitive" Margin="0,3"
                                         ItemsSource="{Binding SupplierMaster}"
                                         DisplayMemberPath="SupplierName"
                                         SelectedValuePath="SupplierName"
                                         SelectedItem="{Binding SelectedSupplier}" EmptyText="Name starts with..."
                                         >
                            <telerik:RadComboBox.ItemsPanel>
                            <ItemsPanelTemplate>
                                <VirtualizingStackPanel />
                            </ItemsPanelTemplate>
                        </telerik:RadComboBox.ItemsPanel>
                    </telerik:RadComboBox>

Please advice if this is possible or if I am missing something.

Thanks,

Gabe.

[GVera]

HELLO !!   Anyone available to answer my question???

[Valeri Hristov]

Hello Gabriel,

You need to use TwoWay binding for the Text property of RadComboBox, as it binds OneWay by default.

Greetings,
Valeri Hristov
the Telerik team

[John]

I'm having the same issue but I have TwoWay binding enabled. My property is never updated. I've tried with different UpdateSourceTriggers to no avail. Any help would be greatly appreciated.

Regards,

John

<telerik:RadComboBox ItemsSource="{Binding FoundItems}"
                     EmptyText="{Binding EmptyText}"
                     TabIndex="0"
                     VerticalAlignment="Top"
                     Grid.Row="0"
                     IsReadOnly="False"
                     DisplayMemberPath="Name"
                     OpenDropDownOnFocus="True"
                     x:Name="searchCombo"
                     Height="30"
                     Text="{Binding SearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                     IsEditable="True"
                     IsTextSearchCaseSensitive="False">
    <telerik:RadComboBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel />
        </ItemsPanelTemplate>
    </telerik:RadComboBox.ItemsPanel>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="KeyDown">
            <i:InvokeCommandAction Command="{Binding BeginSearchCommand}"
                                   CommandParameter="{Binding ElementName=searchCombo, Path=SelectedItem}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</telerik:RadComboBox>

[John]

Nevermind. I'm an idiot. :)