How To Search In ComboBox With TextBox? - combobox

Question

I Have a ComboBox With 3 Items (Room,Class,HighSchool) And a TextBox.
I Want When i Write Room IN TextBox Immediately Combobox.
SelectedItem = Room

Answer 1

You'd be better off using a custom control. I use an intellisense text box that you bind to a list, when you start typing it will automatically select any item in the list with that character.
window xaml below;
<UserControl.Resources>
<Style x:Key="ListBoxItemStyle" TargetType="ListBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Border Name="_Border"
Padding="2"
SnapsToDevicePixels="true">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter TargetName="_Border" Property="Background" Value="Gray"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<Grid>
<TextBox Name="textbox" Grid.Column="1" Grid.Row="2" GotMouseCapture="textbox_GotMouseCapture"
GotFocus="textbox_GotFocus" PreviewKeyDown="textbox_PreviewKeyDown" TextChanged="textbox_TextChanged"
DataContext="{Binding ElementName=intelliWin}"
Text="{Binding Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Width="{Binding ElementName=intelliWin, Path=Width}" TextAlignment="Center" Height="20"/>
<Popup Name="popup" Height="Auto" Width="Auto" MinWidth="180" StaysOpen="False" Placement="Bottom"
PlacementTarget="{Binding ElementName=textbox}" HorizontalAlignment="Left">
<Popup.Style>
<Style TargetType="Popup">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="IsOpen" Value="False"/>
</Trigger>
</Style.Triggers>
</Style>
</Popup.Style>
<Grid>
<ListBox Name="listbox" ScrollViewer.HorizontalScrollBarVisibility="Hidden"
MouseUp="listbox_MouseUp" ItemContainerStyle="{StaticResource ListBoxItemStyle}">
</ListBox>
</Grid>
</Popup>
</Grid>
to use it in the window you need to do this
<local:IntellisenseStyleTextbox Grid.Column="1" Grid.Row="6" Text="{Binding YOUR LIST DATA, UpdateSourceTrigger=PropertyChanged}" x:Name="intelliseText" Width="200" HorizontalContentAlignment="Center"/>'
then add this to the .cs file
public partial class IntellisenseStyleTextbox : UserControl, INotifyPropertyChanged
{
public IntellisenseStyleTextbox()
{
InitializeComponent();
(this.Content as FrameworkElement).DataContext = this;
}
public List<string> PossibleItems { get; set; }
public event EventHandler ItemSelected;
protected void OnItemSelected(EventArgs e)
{
EventHandler handler = ItemSelected;
if (handler != null)
{
handler(this, e);
}
}
// Bindable Text property from http://blog.jerrynixon.com/2013/07/solved-two-way-binding-inside-user.html
public string Text
{
get
{
return (string)GetValue(TextProperty);
}
set
{
SetValueDp(TextProperty, value);
}
}
// Required to allow items to bind to Text property
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string),
typeof(IntellisenseStyleTextbox), null);
public event PropertyChangedEventHandler PropertyChanged;
void SetValueDp(DependencyProperty property, object value,
[System.Runtime.CompilerServices.CallerMemberName] string p = null)
{
SetValue(property, value);
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(p));
}
public List<string> GetDisplayedModelNames()
{
// Only display items that have the current text at the start of them
List<string> toDisplay = new List<string>();
string match = textbox.Text.ToLower();
foreach (string possibleItem in PossibleItems)
{
string lower = possibleItem.ToLower();
if (lower.Contains(match))
{
toDisplay.Add(possibleItem);
}
}
return toDisplay;
}
private void textbox_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
switch (e.Key)
{
// Up and down arrow keys move up and down list box
case Key.Down:
listbox.SelectedIndex++;
listbox.ScrollIntoView(listbox.SelectedItem);
break;
case Key.Up:
// Make sure item is always selected
if (listbox.SelectedIndex > 0)
{
listbox.SelectedIndex--;
listbox.ScrollIntoView(listbox.SelectedItem);
}
break;
// Enter key fills in OutputName with selected text
case Key.Enter:
SelectListBoxItem();
break;
case Key.Back:
popup.IsOpen = true;
break;
}
base.OnPreviewKeyDown(e);
}
private void SelectListBoxItem()
{
if (listbox.SelectedIndex < 0) return;
List<string> outputNames = GetDisplayedModelNames();
if (listbox.SelectedIndex < outputNames.Count)
{
this.Text = outputNames[listbox.SelectedIndex];
// Move caret to end of text
textbox.CaretIndex = this.Text.Count();
popup.IsOpen = false;
OnItemSelected(new EventArgs());
}
}
private void listbox_MouseUp(object sender, MouseButtonEventArgs e)
{
SelectListBoxItem();
}
private void textbox_GotMouseCapture(object sender, MouseEventArgs e)
{
OpenPopup();
}
private void textbox_GotFocus(object sender, RoutedEventArgs e)
{
OpenPopup();
}
private void OpenPopup()
{
listbox.ItemsSource = GetDisplayedModelNames();
popup.IsOpen = true;
}
private void textbox_TextChanged(object sender, TextChangedEventArgs e)
{
OnPropertyChanged(new DependencyPropertyChangedEventArgs(TextProperty, textbox.Text, textbox.Text));
// Update listbox with relevant names
if (PossibleItems == null) return;
listbox.ItemsSource = this.GetDisplayedModelNames();
}
}