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Question

Silverlight 4 OOB application access HTML DOM of the page in WebBrowser control

Answer 1

A:

You can execute javascript functions inside the WebBrowser control using the InvokeScript method. Note that you can't make cross-domain calls.

Example:

Html page

<html ><head>
    <script type="text/javascript">
        function SetValues(val) {
            document.getElementById("q").value = val;
        }
    </script>
</head><body>
<input type="text" id="q" />
</body></html>

Xaml

 <Grid x:Name="LayoutRoot" Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="268*" />
            <ColumnDefinition Width="132*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="60" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <WebBrowser Name="webBrowser1" Grid.Row="1" Grid.ColumnSpan="2" />
        <Button Content="Search" Name="button1" Click="button1_Click" 
                Grid.Column="1" />
        <TextBox Name="textBox1" />
    </Grid>

code behind

public MainPage()
{
  InitializeComponent();
  webBrowser1.Navigate(new Uri("http://localhost:58976/HTMLPage1.htm"));        
}

private void button1_Click(object sender, RoutedEventArgs e)
{         
  webBrowser1.InvokeScript("SetValues",textBox1.Text);
}

Sorskoot 2010-04-21 07:35:21

Did you see the bit about "external website" in the question? If this doesn't work cross-domain then this doesn't work.

AnthonyWJones 2010-04-21 12:36:50

Answer 2

+2 A:

Quick answer: No.

Long Answer: The original intent for the OOTB + WebBrowserControl was to help customers bake in both Rich Text Format displays (Email, RSS etc) and at the same time provide the ability for printing support for large documents to occur (reports etc).

The same rules apply for iframe as you have with this Control (as far as I know there isn't any plans to change this).

The scenario you just mentioned made me a little nervous as I can see a few of the guys on the Silverlight team raising the issue around security - in that this can be used as a way to automate DOS attacks on websites etc via Silverlight as the unsuspecting payload (even with elevated trust users are often duped into installing things like this - its the reality sorry)..

- Scott Barnes / Former Silverlight Product Manager.

Scott Barnes 2010-04-25 12:28:00

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Silverlight 4 OOB application access HTML DOM of the page in WebBrowser control

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