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POcontextmenu in webbrowser Windows Phone 7
 

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    <p>i successfully added a contextmenu to my webbrowser with this javascript code:</p> <pre><code>public void AttachContextMenu() { try { if ((App.Current as App).Browser.IsScriptEnabled) { (App.Current as App).Browser.InvokeScript("execScript", "function FindParentLink(item) \r\n{\r\n\tif (!item.parentNode)\r\n\t\treturn null;\r\n\tif (item.tagName.toLowerCase() == 'a') \r\n\t{\r\n\t\treturn item;\r\n\t} \r\n\telse \r\n\t{\r\n\t\treturn FindParentLink(item.parentNode);\r\n\t}\r\n}\r\n\r\nfunction FindParentImage(item) \r\n{\r\n\tif (!item.parentNode)\r\n\t\treturn null;\r\n\tif (item.tagName.toLowerCase() == 'img') \r\n\t{\r\n\t\treturn item;\r\n\t} \r\n\telse \r\n\t{\r\n\t\treturn FindParentImage(item.parentNode);\r\n\t}\r\n}\r\n\r\nfunction HandleContextMenu() \r\n{\r\n\tvar linkItem = FindParentLink(event.srcElement);\r\n var imageItem = FindParentImage(event.srcElement);\r\n var notifyOutput = '';\r\n if (linkItem != null) if (linkItem.href != null) notifyOutput += linkItem.href;\r\n if (imageItem != null) if (imageItem.src != null) notifyOutput += imageItem.src;\r\n if (notifyOutput != '')\r\n window.external.notify(notifyOutput);\r\n else\r\n\t\twindow.external.notify('NOTLINKIMG');\r\n}"); (App.Current as App).Browser.InvokeScript("execScript", "document.oncontextmenu = HandleContextMenu;"); } } catch { } } </code></pre> <p>this method is used everytime the browser navigated. So, the scriptnotify code, which will be used when the user holds a link :</p> <pre><code> if (e.Value.ToString() != null &amp;&amp; IsValidUri(e.Value.ToString())) { ContextMenu cm = new ContextMenu(); MenuItem menuItem0 = new MenuItem() { Header = "X", Tag = e.Value }; menuItem0.Click += new RoutedEventHandler(X_Click); MenuItem menuItem1 = new MenuItem() { Header = "Y", Tag = e.Value }; menuItem1.Click += new RoutedEventHandler(Y_Click); MenuItem menuItem2 = new MenuItem() { Header = "Z", Tag = e.Value }; menuItem2.Click += new RoutedEventHandler(Z_Click); cm.Items.Add(menuItem0); cm.Items.Add(menuItem1); cm.Items.Add(menuItem2); ContextMenuService.SetContextMenu(Browser, cm); cm.IsZoomEnabled = false; cm.VerticalOffset = mouseClickPosition.Y; cm.IsOpen = true; } </code></pre> <p>so far, i hope i made everything right. now, it randomly works. nearly 50% of tries cause a error, Visual studio navigates to a blue-white frame named "No source available" and throws a NullReferenceException.</p> <p>Where should this be solved? already set a try-catch block around the hole 2 method, no change :/</p> <p>hope you have some ideas</p> <p>greets roqstr</p>
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