Disable JavaScript error in WebBrowser control

Question

I am developing a windows application with a WebBrowser control that navigates to a sharepoint site  My problem is that i am getting JavaScript error   How can i disable the JavaScript error  I don t want them to pop up

User · Answer

I just found this     private static bool TrySetSuppressScriptErrors WebBrowser webBrowser  bool value                FieldInfo field   typeof WebBrowser  GetField   axIWebBrowser2   BindingFlags Instance   BindingFlags NonPublic           if  field    null                        object axIWebBrowser2   field GetValue webBrowser               if  axIWebBrowser2    null                                axIWebBrowser2 GetType   InvokeMember  Silent   BindingFlags SetProperty  null  axIWebBrowser2  new object     value                     return true                                   return false          usage example to set webBrowser to silent   TrySetSuppressScriptErrors webBrowser true

User · Answer

This disables the script errors and also disables other windows   such as the NTLM login window or the client certificate accept window   The below will suppress only javascript errors       Hides script errors without hiding other dialog boxes  private void SuppressScriptErrorsOnly WebBrowser browser           Ensure that ScriptErrorsSuppressed is set to false      browser ScriptErrorsSuppressed   false          Handle DocumentCompleted to gain access to the Document object      browser DocumentCompleted            new WebBrowserDocumentCompletedEventHandler              browser DocumentCompleted      private void browser DocumentCompleted object sender       WebBrowserDocumentCompletedEventArgs e          WebBrowser sender  Document Window Error             new HtmlElementErrorEventHandler Window Error      private void Window Error object sender       HtmlElementErrorEventArgs e           Ignore the error and suppress the error dialog box       e Handled   true

User · Answer

webBrowser ScriptErrorsSuppressed   true

User · Answer

None of the above solutions were suitable for my scenario  handling  Navigated and  FileDownload events seemed like a good fit but accessing the WebBrowser Document property threw an UnauthorizedAccessException which is caused by cross frame scripting security  our web content contains frames - all on the same domain address but frames have their own security holes that are being blocked    The solution that worked was to override IOleCommandTarget and to catch the script error commands at that level  Here s the WebBrowser sub-class to achieve this        lt summary gt      Subclassed WebBrowser that suppresses error pop-ups           Notes      ScriptErrorsSuppressed property is not used because this actually suppresses  all  pop-ups           More info at      http   stackoverflow com questions 2476360 disable-javascript-error-in-webbrowser-control      lt  summary gt  public class WebBrowserEx   WebBrowser        region Constructor           lt summary gt          Default constructor          Initialise browser control and attach customer event handlers           lt  summary gt      public WebBrowserEx                 this ScriptErrorsSuppressed   false              endregion       region Overrides           lt summary gt          Override to allow custom script error handling           lt  summary gt           lt returns gt  lt  returns gt      protected override WebBrowserSiteBase CreateWebBrowserSiteBase                 return new WebBrowserSiteEx this               endregion       region Inner Class  WebBrowserSiteEx            lt summary gt          Sub-class to allow custom script error handling           lt  summary gt      protected class WebBrowserSiteEx   WebBrowserSite  NativeMethods IOleCommandTarget                    lt summary gt              Default constructor               lt  summary gt          public WebBrowserSiteEx WebBrowserEx webBrowser    base  webBrowser                                       lt summary gt Queries the object for the status of one or more commands generated by user interface events  lt  summary gt               lt param name  pguidCmdGroup  gt The GUID of the command group  lt  param gt               lt param name  cCmds  gt The number of commands in  lt paramref name  prgCmds    gt   lt  param gt               lt param name  prgCmds  gt An array of OLECMD structures that indicate the commands for which the caller needs status information  This method fills the  lt paramref name  cmdf    gt  member of each structure with values taken from the OLECMDF enumeration  lt  param gt               lt param name  pCmdText  gt An OLECMDTEXT structure in which to return name and or status information of a single command  This parameter can be null to indicate that the caller does not need this information  lt  param gt               lt returns gt This method returns S OK on success  Other possible return values include the following              E FAIL The operation failed              E UNEXPECTED An unexpected error has occurred              E POINTER The  lt paramref name  prgCmds    gt  argument is null              OLECMDERR E UNKNOWNGROUP The  lt paramref name  pguidCmdGroup    gt  parameter is not null but does not specify a recognized command group  lt  returns gt          public int QueryStatus ref Guid pguidCmdGroup  int cCmds  NativeMethods OLECMD prgCmds  IntPtr pCmdText                        if  int NativeMethods OLECMDID OLECMDID SHOWSCRIPTERROR    prgCmds cmdID                     Do nothing  suppress script errors                  return NativeMethods S OK                                Indicate that command is unknown  The command will then be handled by another IOleCommandTarget              return NativeMethods OLECMDERR E UNKNOWNGROUP                          lt summary gt Executes the specified command  lt  summary gt               lt param name  pguidCmdGroup  gt The GUID of the command group  lt  param gt               lt param name  nCmdID  gt The command ID  lt  param gt               lt param name  nCmdexecopt  gt Specifies how the object should execute the command  Possible values are taken from the  lt see cref  T Microsoft VisualStudio OLE Interop OLECMDEXECOPT    gt  and  lt see cref  T Microsoft VisualStudio OLE Interop OLECMDID WINDOWSTATE FLAG    gt  enumerations  lt  param gt               lt param name  pvaIn  gt The input arguments of the command  lt  param gt               lt param name  pvaOut  gt The output arguments of the command  lt  param gt               lt returns gt This method returns S OK on success  Other possible return values include              OLECMDERR E UNKNOWNGROUP The  lt paramref name  pguidCmdGroup    gt  parameter is not null but does not specify a recognized command group              OLECMDERR E NOTSUPPORTED The  lt paramref name  nCmdID    gt  parameter is not a valid command in the group identified by  lt paramref name  pguidCmdGroup    gt               OLECMDERR E DISABLED The command identified by  lt paramref name  nCmdID    gt  is currently disabled and cannot be executed              OLECMDERR E NOHELP The caller has asked for help on the command identified by  lt paramref name  nCmdID    gt   but no help is available              OLECMDERR E CANCELED The user canceled the execution of the command  lt  returns gt          public int Exec ref Guid pguidCmdGroup  int nCmdID  int nCmdexecopt  object   pvaIn  int pvaOut                        if  int NativeMethods OLECMDID OLECMDID SHOWSCRIPTERROR    nCmdID                     Do nothing  suppress script errors                  return NativeMethods S OK                                Indicate that command is unknown  The command will then be handled by another IOleCommandTarget              return NativeMethods OLECMDERR E UNKNOWNGROUP                        endregion             lt summary gt      Native  unmanaged  methods  required for custom command handling for the WebBrowser control       lt  summary gt  public static class NativeMethods           From docobj h     public const int OLECMDERR E UNKNOWNGROUP   -2147221244            lt summary gt          From Microsoft VisualStudio OLE Interop  Visual Studio 2010 SDK            lt  summary gt      public enum OLECMDID                    lt summary   gt          OLECMDID OPEN   1               lt summary   gt          OLECMDID NEW               lt summary   gt          OLECMDID SAVE               lt summary   gt          OLECMDID SAVEAS               lt summary   gt          OLECMDID SAVECOPYAS               lt summary   gt          OLECMDID PRINT               lt summary   gt          OLECMDID PRINTPREVIEW               lt summary   gt          OLECMDID PAGESETUP               lt summary   gt          OLECMDID SPELL               lt summary   gt          OLECMDID PROPERTIES               lt summary   gt          OLECMDID CUT               lt summary   gt          OLECMDID COPY               lt summary   gt          OLECMDID PASTE               lt summary   gt          OLECMDID PASTESPECIAL               lt summary   gt          OLECMDID UNDO               lt summary   gt          OLECMDID REDO               lt summary   gt          OLECMDID SELECTALL               lt summary   gt          OLECMDID CLEARSELECTION               lt summary   gt          OLECMDID ZOOM               lt summary   gt          OLECMDID GETZOOMRANGE               lt summary   gt          OLECMDID UPDATECOMMANDS               lt summary   gt          OLECMDID REFRESH               lt summary   gt          OLECMDID STOP               lt summary   gt          OLECMDID HIDETOOLBARS               lt summary   gt          OLECMDID SETPROGRESSMAX               lt summary   gt          OLECMDID SETPROGRESSPOS               lt summary   gt          OLECMDID SETPROGRESSTEXT               lt summary   gt          OLECMDID SETTITLE               lt summary   gt          OLECMDID SETDOWNLOADSTATE               lt summary   gt          OLECMDID STOPDOWNLOAD               lt summary   gt          OLECMDID ONTOOLBARACTIVATED               lt summary   gt          OLECMDID FIND               lt summary   gt          OLECMDID DELETE               lt summary   gt          OLECMDID HTTPEQUIV               lt summary   gt          OLECMDID HTTPEQUIV DONE               lt summary   gt          OLECMDID ENABLE INTERACTION               lt summary   gt          OLECMDID ONUNLOAD               lt summary   gt          OLECMDID PROPERTYBAG2               lt summary   gt          OLECMDID PREREFRESH               lt summary   gt          OLECMDID SHOWSCRIPTERROR               lt summary   gt          OLECMDID SHOWMESSAGE               lt summary   gt          OLECMDID SHOWFIND               lt summary   gt          OLECMDID SHOWPAGESETUP               lt summary   gt          OLECMDID SHOWPRINT               lt summary   gt          OLECMDID CLOSE               lt summary   gt          OLECMDID ALLOWUILESSSAVEAS               lt summary   gt          OLECMDID DONTDOWNLOADCSS               lt summary   gt          OLECMDID UPDATEPAGESTATUS               lt summary   gt          OLECMDID PRINT2               lt summary   gt          OLECMDID PRINTPREVIEW2               lt summary   gt          OLECMDID SETPRINTTEMPLATE               lt summary   gt          OLECMDID GETPRINTTEMPLATE                 lt summary gt          From Microsoft VisualStudio Shell  Visual Studio 2010 SDK            lt  summary gt      public const int S OK   0            lt summary gt          OLE command structure           lt  summary gt       StructLayout LayoutKind Sequential       public class OLECMD                    lt summary gt              Command ID               lt  summary gt           MarshalAs UnmanagedType U4           public int cmdID               lt summary gt              Flags associated with cmdID               lt  summary gt           MarshalAs UnmanagedType U4           public int cmdf                  lt summary gt          Enables the dispatching of commands between objects and containers           lt  summary gt       ComVisible true   Guid  B722BCCB-4E68-101B-A2BC-00AA00404770    InterfaceType ComInterfaceType InterfaceIsIUnknown        ComImport      public interface IOleCommandTarget                    lt summary gt Queries the object for the status of one or more commands generated by user interface events  lt  summary gt               lt param name  pguidCmdGroup  gt The GUID of the command group  lt  param gt               lt param name  cCmds  gt The number of commands in  lt paramref name  prgCmds    gt   lt  param gt               lt param name  prgCmds  gt An array of  lt see cref  T Microsoft VisualStudio OLE Interop OLECMD    gt  structures that indicate the commands for which the caller needs status information  lt  param gt               lt param name  pCmdText  gt An  lt see cref  T Microsoft VisualStudio OLE Interop OLECMDTEXT    gt  structure in which to return name and or status information of a single command  This parameter can be null to indicate that the caller does not need this information  lt  param gt               lt returns gt This method returns S OK on success  Other possible return values include the following              E FAIL The operation failed              E UNEXPECTED An unexpected error has occurred              E POINTER The  lt paramref name  prgCmds    gt  argument is null              OLECMDERR E UNKNOWNGROUPThe  lt paramref name  pguidCmdGroup    gt  parameter is not null but does not specify a recognized command group  lt  returns gt           PreserveSig           return  MarshalAs UnmanagedType I4           int QueryStatus ref Guid pguidCmdGroup  int cCmds   In   Out  NativeMethods OLECMD prgCmds   In   Out  IntPtr pCmdText                 lt summary gt Executes the specified command  lt  summary gt               lt param name  pguidCmdGroup  gt The GUID of the command group  lt  param gt               lt param name  nCmdID  gt The command ID  lt  param gt               lt param name  nCmdexecopt  gt Specifies how the object should execute the command  Possible values are taken from the  lt see cref  T Microsoft VisualStudio OLE Interop OLECMDEXECOPT    gt  and  lt see cref  T Microsoft VisualStudio OLE Interop OLECMDID WINDOWSTATE FLAG    gt  enumerations  lt  param gt               lt param name  pvaIn  gt The input arguments of the command  lt  param gt               lt param name  pvaOut  gt The output arguments of the command  lt  param gt               lt returns gt This method returns S OK on success  Other possible return values include              OLECMDERR E UNKNOWNGROUP The  lt paramref name  pguidCmdGroup    gt  parameter is not null but does not specify a recognized command group              OLECMDERR E NOTSUPPORTED The  lt paramref name  nCmdID    gt  parameter is not a valid command in the group identified by  lt paramref name  pguidCmdGroup    gt               OLECMDERR E DISABLED The command identified by  lt paramref name  nCmdID    gt  is currently disabled and cannot be executed              OLECMDERR E NOHELP The caller has asked for help on the command identified by  lt paramref name  nCmdID    gt   but no help is available              OLECMDERR E CANCELED The user canceled the execution of the command  lt  returns gt           PreserveSig           return  MarshalAs UnmanagedType I4           int Exec ref Guid pguidCmdGroup  int nCmdID  int nCmdexecopt   MarshalAs UnmanagedType LPArray    In  object   pvaIn  int pvaOut

User · Answer

Here is an alternative solution   class extendedWebBrowser   WebBrowser            lt summary gt          Default constructor which will make the browser to ignore all errors          lt  summary gt      public extendedWebBrowser                 this ScriptErrorsSuppressed   true           FieldInfo field   typeof WebBrowser  GetField   axIWebBrowser2   BindingFlags Instance   BindingFlags NonPublic           if  field    null                         object axIWebBrowser2   field GetValue this                axIWebBrowser2 GetType   InvokeMember  Silent   BindingFlags SetProperty  null  axIWebBrowser2  new object     true

User · Answer

axwebbrowser1 Silent   true

[c#] Disable JavaScript error in WebBrowser control

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