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POusing Silverlight 3's HtmlPage.Window.Navigate method to reuse an already open browser window
 

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  1. POusing Silverlight 3's HtmlPage.Window.Navigate method to reuse an already open browser window
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    <p>I want to use an external browser window to implement a preview functionality in a silverlight application. There is a list of items and whenever the user clicks one of these items, it's opened in a separate browser window (the content is a pdf document, which is why it is handled ouside of the SL app).</p> <p>Now, to achieve this, I simply use </p> <pre><code>HtmlPage.Window.Navigate(new Uri("http://www.bing.com"), "_blank"); </code></pre> <p>which works fine.</p> <p>Now my client doesn't like the fact that every click opens up a new browser window. He would like to see the browser window reused every time an item is clicked. So I went out and tried implementing this:</p> <p><b>Option 1</b> - Use the overload of the Navigate method, like so:</p> <pre><code>HtmlPage.Window.Navigate(new Uri("http://www.bing.com"), "foo"); </code></pre> <p>I was assuming that the window would be reused when the same target parameter value (foo) would be used in subsequent calls.<br> This does not work. I get a new window every time.</p> <p><b>Option 2</b> - Use the PopupWindow method on the HtmlPage</p> <pre><code>HtmlPage.PopupWindow(new Uri("http://www.bing.com"), "blah", new HtmlPopupWindowOptions()); </code></pre> <p>This does not work. I get a new window every time.</p> <p><b>Option 3</b> - Get a handle to the opened window and reuse that in subsequent calls</p> <pre><code>private HtmlWindow window; private void navigationButton_Click(object sender, RoutedEventArgs e) { if (window == null) window = HtmlPage.Window.Navigate(new Uri("http://www.bing.com"), "blah"); else window.Navigate(new Uri("http://www.bing.com"), "blah"); if (window == null) MessageBox.Show("it's null"); } </code></pre> <p>This does not work. I tried the same for the PopupWindow() method and the window is null every time, so a new window is opened on every click. I have checked both the EnableHtmlAccess and the IsPopupWindowAllowed properties, and they return true, <a href="http://msdn.microsoft.com/en-us/library/system.windows.browser.htmlpage.popupwindow%28VS.95%29.aspx" rel="nofollow noreferrer">as they should</a>.</p> <p><b>Option 4</b> - Use Eval method to execute some custom javascript</p> <pre><code>private const string javascript = @"var popup = window.open('', 'blah') ; if(popup.location != 'http://www.bing.com' ){ popup.location = 'http://www.bing.com'; } popup.focus();"; private void navigationButton_Click(object sender, RoutedEventArgs e) { HtmlPage.Window.Eval(javascript); } </code></pre> <p>This does not work. I get a new window every time.</p> <p><b>option 5</b> - Use CreateInstance to run some custom javascript on the page</p> <pre><code>private void navigationButton_Click(object sender, RoutedEventArgs e) { HtmlPage.Window.CreateInstance("thisIsPlainHell"); } </code></pre> <p>and in my aspx I have</p> <pre><code>function thisIsPlainHell() { var popup = window.open('http://www.bing.com', 'blah'); } </code></pre> <p>This doesn't work. I get a new window every time.</p> <p>Am I doing something wrong? I'm definitely no javascript expert, so I'm hoping it's something obvious I'm missing here.</p> <p>Cheers, Phil</p>
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