In WP7 TextBox.Focus() does not work when WebBrowser control is present on page

问题

I need to set focus on the textbox. The problem is when a WebBrowser control is present on the page, the SIP is displayed as if textbox is selected, but cursor is not visible in textbox and the input does not go to the textbox.

If I comment the WebBrowser control out, then the behavior is as expected - cursor is blinking in the TextBox when page is loaded.

Here is the XAML:

<phone:PhoneApplicationPage 
x:Class="WP7Sample.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
Loaded="MainPageLoaded">

<StackPanel x:Name="LayoutRoot">
    <TextBox x:Name="txt"/>
    <phone:WebBrowser/>
</StackPanel>

</phone:PhoneApplicationPage>

And the codebehind:

void MainPageLoaded(object sender, RoutedEventArgs e)
{
    txt.Focus();
}

I have tried the different workarounds, but no luck. Namely I have tried to call SetFocus from the Load, NavigatedTo etc events. I have also tried to set focus to some other control and then back to the textbox, no luck either.

Could someone provide a workaround for this problem?

BTW, the problem is reproduced on the emulator, on HTC Mozart and Trophy devices all with NoDo update installed.

回答1:

step 1 : Bind loaded event with respective textbox where u want to set focus

<StackPanel x:Name="ContentPanel" Margin="2,0,2,0">
  <TextBox x:Name="SearchTextBox" Height="90" VerticalAlignment="Top" 
           Loaded="SearchTextBox_Loaded"
           KeyDown="SearchTextBox_KeyDown"/>
</StackPanel>

step- 2: Now set Focus in when this event occurs

private void SearchTextBox_Loaded(object sender, RoutedEventArgs e)  
{  
    (sender as TextBox).Focus();  
}

回答2:

Try using the txt.Focus() call twice. I found this looking for a solution on how to set focus on a ListBox. I ended up trying to call the Control.Focus() function twice to set the focus (firing 3 GotFocus events) and it seemed to work.

回答3:

This is a dirty workaround, but you could do this. On startup have the WebBrowser component absent from the page. Then, have the TextBox control wired to a LostFocus event. Something like this:

txt.LostFocus += new RoutedEventHandler(txt_LostFocus);

When it loses focus, you can safely add a WebBrowser control to the page:

void txt_LostFocus(object sender, RoutedEventArgs e)
{
    LayoutRoot.Children.Add(new WebBrowser());
}

This won't let you re-focus programmaticlly later, as the WebBrowser will be inhibiting it, but it is a way to do it at startup.

回答4:

Try handling something in the GotFocus event. Maybe txt.SelectionStart = txt.Text.Length; It works for me.

回答5:

As we have provided a hack for the case for pre-Mango versions of WP7, I had not checked the scenario beforehand. The good news, guys!

In WP7 Mango the problem does not exist!

来源：https://stackoverflow.com/questions/5947580/in-wp7-textbox-focus-does-not-work-when-webbrowser-control-is-present-on-page

标签

windows-phone-7

textbox

focus

browser