如何在wp7应用程序的文本框中提供占位符

Question

I am building an app for windows phone 7 where i have a textbox in which i want to place a placeholder.

My xaml is:

<TextBox Height="73" HorizontalAlignment="Left" Margin="18,45,0,0"  Name="name"  Text="Name" VerticalAlignment="Top" Width="419" />

Answer 1

If i am getting your question right and also if my knowledge serves me correctly then

There is no special property for placeholders or water mark in wp7 textboxes

How ever you can customize a textbox to fit in accordance to your needs.

Its just very simple

Taking your textbox which is

<TextBox Height="73" HorizontalAlignment="Left" Margin="18,45,0,0"  Name="name"  Text="Name" VerticalAlignment="Top" Width="419" />

and subscribing to its GotFocusEvent

<TextBox GotFocus="OnGotFocus" Height="73" HorizontalAlignment="Left" Margin="18,45,0,0"  Name="name"  Text="Name" VerticalAlignment="Top" Width="419" />

do this in the event handler

private void OnGotFocus(object sender, RoutedEventArgs e)
{
    if (name.Text.Equals("Name", StringComparison.OrdinalIgnoreCase))
    {
        name.Text = string.Empty;
    }  
}

This could imitate your requirement.

Hope this helps.

Answer 2

您应该尝试使用具有提示属性的Windows Phone工具包（ http://phone.codeplex.com/ ）中的PhoneTextBox。

Answer 3

You mean you have to place a cursor when App get's launched. If yes, then go for GotFocus event.

Try this :

<TextBox GotFocus="txt_OnGotFocus" Height="73" HorizontalAlignment="Left" Margin="18,45,0,0"  Name="name"  Text="Name" VerticalAlignment="Top" Width="419" />

Code behind

private void txt_OnGotFocus(object sender, RoutedEventArgs e)
{
   if(this.name.Text == "Name")
   {
       this.name.Text = string.Empty;
   }
}