How to suppress errors in the WebBrowser control

This article describes an All-In-One Code Framework sample that is available for download. This code sample demonstrates how to suppress errors in the WebBrowser control.


The following errors can be suppressed in the WebBrowser control by using the sample code:

• Just-In-Time debugger (JIT debugger) error.
• HTML element errors.
• Navigation errors. For example, "The page does not exist" (HTTP 404 error).
• Other errors. For example, you cannot use the clipboard in a JavaScript function because a permission is needed.

Difficulty level

Download information

To download this code sample, click one of the following links:
 

Technical overview

Suppress JIT debugger

The JIT debugger is disabled after you set the DisableJITDebugger value to yes in the following registry key:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

Note After you modify the registry key, you have to restart the application to enable or disable the JIT debugger. 

Suppress HTML element errors

You can register the Document.Window.Error event, and then handle it.

Suppress a navigation error

The DWebBrowserEvents2 interface designates an event sink interface. The event sink interface enables an application to receive event notifications from the underlying ActiveX control, such as the NavigateError event.

To suppress this error, you can set the cancel flag to TRUE.

Suppress other errors

If you want to suppress all errors, you can set the ScriptErrorsSuppressed property to TRUE. When the ScriptErrorsSuppressed property is set to TRUE, the WebBrowser control hides not only JavaScript errors, but all dialog boxes that originate from the underlying ActiveX control.


Occasionally, you might need to suppress JaveScript errors while displaying dialog boxes that are used for browser security settings and user logons. In this case, you can set the ScriptErrorsSuppressed property to FALSE and suppress JavaScript errors in a handler for the HtmlWindow.Error event.


Note For more information about how to create and deploy the sample application, see the Readme.txt file that is included in the download package.

Languages

This code sample is available in the following programming languages:

Language	Project Name
Visual C#	CSWebBrowserSuppressError
Visual Basic.NET	VBWebBrowserSuppressError

Prerequisites

This sample application was created using Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.

References

For more information about the DWebBrowserEvents2 interface, visit the following Microsoft Developer (MSDN) website:

General information about the DWebBrowserEvents2 interface

For more information about the WebBrowser.ScriptErrorsSuppressed property, visit the following MSDN website:

General information about the WebBrowser.ScriptErrorsSuppressed property

For more information about the WebBrowser.CreateSink method, visit the following MSDN website:

General information about the WebBrowser.CreateSink method

What is All-In-One Code Framework?
 

All-In-One Code Framework shows most Microsoft development techniques by using code samples in different programming languages. Each example is carefully selected, composed, and documented to show one common code scenario. For more information about All-In-One Code Framework, visit the following Microsoft website:

http://1code.codeplex.com

How to find more All-In-One Code Framework samples

To find more All-In-One Code Framework samples, search for "kbcodefx" together with related keywords on the Microsoft support Web site. Or, visit the following Microsoft website:

All-In-One Code Framework samples

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