How to select all the current text on focus in Xamarin ComboBox?
You can select all the text on focus in Xamarin ComboBox by using custom renderer.
Refer to this Getting started documentation to create a simple ComboBox sample and configure it.
Step 1: Create a custom ComboBox class as follows.
public class CustomComboBox : SfComboBox
{
}
Step 2: Create Custom renderer for the ComboBox class in each platform and invoke the focus event to select all text as the following code snippets.
CustomRenderer - Android:
[assembly: ExportRenderer(typeof(CustomComboBox), typeof(CustomComboBoxRenderer))]
namespace CustomRenderer.Android
{
class CustomComboBoxRenderer : SfComboBoxRenderer
{
. . .
protected override void OnElementChanged(ElementChangedEventArgs<Syncfusion.XForms.ComboBox.SfComboBox> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
if (Control != null)
{
Control.GetAutoEditText().SetSelectAllOnFocus(true);
Control.FocusChanged += Control_FocusChanged;
}
}
}
private void Control_FocusChanged(object sender, FocusChangedEventArgs e)
{
if (e.HasFocus)
{
Control.GetAutoEditText().SetSelectAllOnFocus(true);
}
}
. . .
}
}
CustomRenderer - iOS:
[assembly: ExportRenderer (typeof(CustomComboBox), typeof(CustomComboBoxRenderer))]
namespace CustomRenderer.iOS
{
public class CustomComboBoxRenderer : SfComboBoxRenderer
{
. . .
protected override void OnElementChanged(ElementChangedEventArgs<Syncfusion.XForms.ComboBox.SfComboBox> e)
{
base.OnElementChanged(e);
if (Control != null)
{
if (Control != null)
{
Control.FocusChanged += Control_FocusChanged;
}
}
}
private void Control_FocusChanged(object sender, Syncfusion.iOS.ComboBox.FocusEventArgs e)
{
if (e.HasFocus)
{
Control.TextField.SelectAll(null);
}
}
. . .
}
}
CustomRenderer - UWP:
[assembly: ExportRenderer(typeof(CustomComboBox), typeof(CustomComboBoxRenderer))]
namespace CustomRenderer.UWP
{
public class CustomComboBoxRenderer : SfComboBoxRenderer
{
. . .
protected override void OnElementChanged(ElementChangedEventArgs<Syncfusion.XForms.ComboBox.SfComboBox> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.GotFocus += Control_GotFocus;
}
}
private void Control_GotFocus(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
Control.SelectAll();
}
. . .
}
}
Step 3: Initialize the CustomComboBox and set required properties in XAML page as like below code snippet
<local:CustomComboBox x:Name="comboBox"
ComboBoxMode="Suggest"
DataSource="{Binding EmployeeCollection}"
DisplayMemberPath="Name"
HeightRequest="40"
IsEditableMode="True" />
Output:
Sample link:
Conclusion
I hope you enjoyed learning about how to select all the current text on focus in Xamarin ComboBox.
You can refer to our Xamarin.Forms ComboBox feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.
For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.
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