Tôi đang phát triển một ứng dụng windows với điều khiển WebBrowser điều hướng đến một trang điểm chia sẻ.
Vấn đề của tôi là tôi gặp lỗi JavaScript.
Làm cách nào tôi có thể vô hiệu hóa lỗi JavaScript? Tôi không muốn chúng bật lên.
Câu trả lời:
webBrowser.ScriptErrorsSuppressed = true;Điều này vô hiệu hóa các lỗi tập lệnh và cũng vô hiệu hóa các cửa sổ khác .. chẳng hạn như cửa sổ đăng nhập NTLM hoặc cửa sổ chấp nhận chứng chỉ ứng dụng khách. Dưới đây sẽ chỉ loại bỏ các lỗi javascript.
// 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;
}Không có giải pháp nào ở trên phù hợp với kịch bản của tôi, việc xử lý các sự kiện .Navioned và .FileDownload có vẻ phù hợp nhưng việc truy cập thuộc tính WebBrowser.Document đã ném ra một ngoại lệ UnauthorizedAccessException gây ra bởi bảo mật tập lệnh khung chéo (nội dung web của chúng tôi chứa các khung - tất cả đều trên cùng một miền / địa chỉ nhưng các khung có lỗ hổng bảo mật riêng đang bị chặn).
Giải pháp hoạt động là ghi đè IOleCommandTarget và bắt các lệnh lỗi tập lệnh ở cấp đó. Đây là lớp con WebBrowser để đạt được điều này:
/// <summary>
/// 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
/// </summary>
public class WebBrowserEx : WebBrowser
{
#region Constructor
/// <summary>
/// Default constructor.
/// Initialise browser control and attach customer event handlers.
/// </summary>
public WebBrowserEx()
{
this.ScriptErrorsSuppressed = false;
}
#endregion
#region Overrides
/// <summary>
/// Override to allow custom script error handling.
/// </summary>
/// <returns></returns>
protected override WebBrowserSiteBase CreateWebBrowserSiteBase()
{
return new WebBrowserSiteEx(this);
}
#endregion
#region Inner Class [WebBrowserSiteEx]
/// <summary>
/// Sub-class to allow custom script error handling.
/// </summary>
protected class WebBrowserSiteEx : WebBrowserSite, NativeMethods.IOleCommandTarget
{
/// <summary>
/// Default constructor.
/// </summary>
public WebBrowserSiteEx(WebBrowserEx webBrowser) : base (webBrowser)
{
}
/// <summary>Queries the object for the status of one or more commands generated by user interface events.</summary>
/// <param name="pguidCmdGroup">The GUID of the command group.</param>
/// <param name="cCmds">The number of commands in <paramref name="prgCmds" />.</param>
/// <param name="prgCmds">An array of OLECMD structures that indicate the commands for which the caller needs status information. This method fills the <paramref name="cmdf" /> member of each structure with values taken from the OLECMDF enumeration.</param>
/// <param name="pCmdText">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.</param>
/// <returns>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 <paramref name="prgCmds" /> argument is null.
/// OLECMDERR_E_UNKNOWNGROUP The <paramref name="pguidCmdGroup" /> parameter is not null but does not specify a recognized command group.</returns>
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;
}
/// <summary>Executes the specified command.</summary>
/// <param name="pguidCmdGroup">The GUID of the command group.</param>
/// <param name="nCmdID">The command ID.</param>
/// <param name="nCmdexecopt">Specifies how the object should execute the command. Possible values are taken from the <see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDEXECOPT" /> and <see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDID_WINDOWSTATE_FLAG" /> enumerations.</param>
/// <param name="pvaIn">The input arguments of the command.</param>
/// <param name="pvaOut">The output arguments of the command.</param>
/// <returns>This method returns S_OK on success. Other possible return values include
/// OLECMDERR_E_UNKNOWNGROUP The <paramref name="pguidCmdGroup" /> parameter is not null but does not specify a recognized command group.
/// OLECMDERR_E_NOTSUPPORTED The <paramref name="nCmdID" /> parameter is not a valid command in the group identified by <paramref name="pguidCmdGroup" />.
/// OLECMDERR_E_DISABLED The command identified by <paramref name="nCmdID" /> is currently disabled and cannot be executed.
/// OLECMDERR_E_NOHELP The caller has asked for help on the command identified by <paramref name="nCmdID" />, but no help is available.
/// OLECMDERR_E_CANCELED The user canceled the execution of the command.</returns>
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
}~
/// <summary>
/// Native (unmanaged) methods, required for custom command handling for the WebBrowser control.
/// </summary>
public static class NativeMethods
{
/// From docobj.h
public const int OLECMDERR_E_UNKNOWNGROUP = -2147221244;
/// <summary>
/// From Microsoft.VisualStudio.OLE.Interop (Visual Studio 2010 SDK).
/// </summary>
public enum OLECMDID
{
/// <summary />
OLECMDID_OPEN = 1,
/// <summary />
OLECMDID_NEW,
/// <summary />
OLECMDID_SAVE,
/// <summary />
OLECMDID_SAVEAS,
/// <summary />
OLECMDID_SAVECOPYAS,
/// <summary />
OLECMDID_PRINT,
/// <summary />
OLECMDID_PRINTPREVIEW,
/// <summary />
OLECMDID_PAGESETUP,
/// <summary />
OLECMDID_SPELL,
/// <summary />
OLECMDID_PROPERTIES,
/// <summary />
OLECMDID_CUT,
/// <summary />
OLECMDID_COPY,
/// <summary />
OLECMDID_PASTE,
/// <summary />
OLECMDID_PASTESPECIAL,
/// <summary />
OLECMDID_UNDO,
/// <summary />
OLECMDID_REDO,
/// <summary />
OLECMDID_SELECTALL,
/// <summary />
OLECMDID_CLEARSELECTION,
/// <summary />
OLECMDID_ZOOM,
/// <summary />
OLECMDID_GETZOOMRANGE,
/// <summary />
OLECMDID_UPDATECOMMANDS,
/// <summary />
OLECMDID_REFRESH,
/// <summary />
OLECMDID_STOP,
/// <summary />
OLECMDID_HIDETOOLBARS,
/// <summary />
OLECMDID_SETPROGRESSMAX,
/// <summary />
OLECMDID_SETPROGRESSPOS,
/// <summary />
OLECMDID_SETPROGRESSTEXT,
/// <summary />
OLECMDID_SETTITLE,
/// <summary />
OLECMDID_SETDOWNLOADSTATE,
/// <summary />
OLECMDID_STOPDOWNLOAD,
/// <summary />
OLECMDID_ONTOOLBARACTIVATED,
/// <summary />
OLECMDID_FIND,
/// <summary />
OLECMDID_DELETE,
/// <summary />
OLECMDID_HTTPEQUIV,
/// <summary />
OLECMDID_HTTPEQUIV_DONE,
/// <summary />
OLECMDID_ENABLE_INTERACTION,
/// <summary />
OLECMDID_ONUNLOAD,
/// <summary />
OLECMDID_PROPERTYBAG2,
/// <summary />
OLECMDID_PREREFRESH,
/// <summary />
OLECMDID_SHOWSCRIPTERROR,
/// <summary />
OLECMDID_SHOWMESSAGE,
/// <summary />
OLECMDID_SHOWFIND,
/// <summary />
OLECMDID_SHOWPAGESETUP,
/// <summary />
OLECMDID_SHOWPRINT,
/// <summary />
OLECMDID_CLOSE,
/// <summary />
OLECMDID_ALLOWUILESSSAVEAS,
/// <summary />
OLECMDID_DONTDOWNLOADCSS,
/// <summary />
OLECMDID_UPDATEPAGESTATUS,
/// <summary />
OLECMDID_PRINT2,
/// <summary />
OLECMDID_PRINTPREVIEW2,
/// <summary />
OLECMDID_SETPRINTTEMPLATE,
/// <summary />
OLECMDID_GETPRINTTEMPLATE
}
/// <summary>
/// From Microsoft.VisualStudio.Shell (Visual Studio 2010 SDK).
/// </summary>
public const int S_OK = 0;
/// <summary>
/// OLE command structure.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public class OLECMD
{
/// <summary>
/// Command ID.
/// </summary>
[MarshalAs(UnmanagedType.U4)]
public int cmdID;
/// <summary>
/// Flags associated with cmdID.
/// </summary>
[MarshalAs(UnmanagedType.U4)]
public int cmdf;
}
/// <summary>
/// Enables the dispatching of commands between objects and containers.
/// </summary>
[ComVisible(true), Guid("B722BCCB-4E68-101B-A2BC-00AA00404770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[ComImport]
public interface IOleCommandTarget
{
/// <summary>Queries the object for the status of one or more commands generated by user interface events.</summary>
/// <param name="pguidCmdGroup">The GUID of the command group.</param>
/// <param name="cCmds">The number of commands in <paramref name="prgCmds" />.</param>
/// <param name="prgCmds">An array of <see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMD" /> structures that indicate the commands for which the caller needs status information.</param>
/// <param name="pCmdText">An <see cref="T:Microsoft.VisualStudio.OLE.Interop.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.</param>
/// <returns>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 <paramref name="prgCmds" /> argument is null.
/// OLECMDERR_E_UNKNOWNGROUPThe <paramref name="pguidCmdGroup" /> parameter is not null but does not specify a recognized command group.</returns>
[PreserveSig]
[return: MarshalAs(UnmanagedType.I4)]
int QueryStatus(ref Guid pguidCmdGroup, int cCmds, [In] [Out] NativeMethods.OLECMD prgCmds, [In] [Out] IntPtr pCmdText);
/// <summary>Executes the specified command.</summary>
/// <param name="pguidCmdGroup">The GUID of the command group.</param>
/// <param name="nCmdID">The command ID.</param>
/// <param name="nCmdexecopt">Specifies how the object should execute the command. Possible values are taken from the <see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDEXECOPT" /> and <see cref="T:Microsoft.VisualStudio.OLE.Interop.OLECMDID_WINDOWSTATE_FLAG" /> enumerations.</param>
/// <param name="pvaIn">The input arguments of the command.</param>
/// <param name="pvaOut">The output arguments of the command.</param>
/// <returns>This method returns S_OK on success. Other possible return values include
/// OLECMDERR_E_UNKNOWNGROUP The <paramref name="pguidCmdGroup" /> parameter is not null but does not specify a recognized command group.
/// OLECMDERR_E_NOTSUPPORTED The <paramref name="nCmdID" /> parameter is not a valid command in the group identified by <paramref name="pguidCmdGroup" />.
/// OLECMDERR_E_DISABLED The command identified by <paramref name="nCmdID" /> is currently disabled and cannot be executed.
/// OLECMDERR_E_NOHELP The caller has asked for help on the command identified by <paramref name="nCmdID" />, but no help is available.
/// OLECMDERR_E_CANCELED The user canceled the execution of the command.</returns>
[PreserveSig]
[return: MarshalAs(UnmanagedType.I4)]
int Exec(ref Guid pguidCmdGroup, int nCmdID, int nCmdexecopt, [MarshalAs(UnmanagedType.LPArray)] [In] object[] pvaIn, int pvaOut);
}
}embedtrên trang này - dev.windows.com/en-us/microsoft-edge/platform/faq/apps-engine )
axwebbrowser1.Silent = true;
Đây là một giải pháp thay thế:
class extendedWebBrowser : WebBrowser
{
/// <summary>
/// Default constructor which will make the browser to ignore all errors
/// </summary>
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 });
}
}
}Tôi vừa tìm thấy cái này:
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;
}ví dụ sử dụng để đặt webBrowser thành im lặng: TrySetSuppressScriptErrors (webBrowser, true)