1

I have one TextBox. On clicking it, all the contents of the TextBox should be selected. What is the solution for this? The code I have tried is:

<TextBox Name="questionTitle_textBox" Text="Question title" PreviewMouseDown="questionTitle_textBox_PreviewMouseDown"/>

The function questionTitle_textBox_PreviewMouseDown is defined as

private void questionTitle_textBox_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
        questionTitle_textBox.SelectAll();
}
amit jha
  • 398
  • 2
  • 6
  • 22

2 Answers2

2

This works

<TextBox Name="questionTitle_textBox" Text="Question title" GotFocus="questionTitle_textBox_GotFocus" PreviewMouseLeftButtonDown="questionTitle_textBox_PreviewMouseLeftButtonDown"/>

and in code behind

private void questionTitle_textBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    TextBox tb = (sender as TextBox);
    if (tb != null)
    {
        if (!tb.IsFocused)
        {
            e.Handled = true;
            tb.Focus();
        }
    }
}

private void questionTitle_textBox_GotFocus(object sender, RoutedEventArgs e)
{
    TextBox tb = (sender as TextBox);
    if (tb != null)
    {
        tb.SelectAll();
    }
}
amit jha
  • 398
  • 2
  • 6
  • 22
Dinesh balan
  • 495
  • 4
  • 15
1

You can try to add a trigger to your TextBox

<TextBox Name="questionTitle_textBox" Text="Question title" >
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="GotFocus">
            <local:SelectAllAction />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</TextBox>

Add SelectAllAction.cs to your project:

namespace YourNameSpace
{
    public class SelectAllAction : TriggerAction<TextBox>
    {
        protected override void Invoke(object parameter)
        {
            if(this.AssociatedObject != null)
            {
                this.AssociatedObject.SelectAll();
            }
        }
    }
}

You also need to add two namepsaces to your XAML to use the trigger. The name of my project was WpfApplication1, so you will probably need to change that:

xmlns:local ="clr-namespace:YourNameSpace" 
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
Stian Sandve
  • 520
  • 4
  • 13
  • Its not working. Same results what I got in the original post. – amit jha Jul 08 '15 at 12:43
  • Its still not working. Same results what I got in the original post. Is it working for you? – amit jha Jul 09 '15 at 06:14
  • Moreover, in Designer/XAML view, it is giving `Invalid Markup`. Although it builds, I have to comment `` to see the Designer/XAML View. – amit jha Jul 09 '15 at 06:31
  • I suspect that you have a mismatch between the namespace you specify in XAML and the one you have specified for the `SelectAllAction` class. Make sure to replace "YourNameSpace" with whatever your namespace is both in XAML and the code behind. Please let me know if it works. – Stian Sandve Jul 09 '15 at 08:03