c# - Allow System.Windows.Forms.WebBrowser to run javascript

Question

Seriously - read the question all the way through before attempting to answer it. "Use a different browser" doesn't answer this question.

The question is this: How do I get a System.Windows.Forms.WebBrowser control to display a web page that has Javascript embedded in it when I have no control over the incoming page? I've already seen people suggest adding registry values for IE emulation (Allowing javascript to run on a windows form web browser) and altering the script settings in Internet Options/Security.

I've done that already.

So, here's the test - use a System.Windows.Forms.WebBrowser control to access www.hulu.com.

And we're still getting this.

Any other ideas?

Answer 1

Set the property ScriptErrorsSuppressed of the WebBrowser control to true to suppress the JavaScript error message.

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In order to allow the code on hulu.com to execute, you must run the Webbrowser control in a mode such that it runs with newer version features. This can only be done by setting registry entries.

See this question and the answers for details.

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To specify: I have a demo application to open the hulu website with the embedded WebBrowser control named WindowsFormsApplication5.exe.

Without registry changes, I see a note by Hulu that JavaScript support is not enabled. When sniffing the network transfer with Fiddler, I see that the following request is sent to the Hulu server:

GET http://www.hulu.com/ HTTP/1.1
Accept: image/gif, image/jpeg, image/pjpeg, application/x-ms-application, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*
Accept-Language: de-DE,de;q=0.5
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729; Creative AutoUpdate v1.41.09)
Host: www.hulu.com
Connection: Keep-Alive
Pragma: no-cache

Note the version number "7.0" in the User-Agent string.

I now add a registry key of type REG_DWORD with name "WindowsFormsApplication5.exe" and value 0x00002af9 (11001) in HKEY_CURRENT_USERSOFTWAREMicrosoftInternet ExplorerMainFeatureControlFEATURE_BROWSER_EMULATION.

As a result, the Hulu Website is successfully displayed in my demo application and I see the following request being sent via Fiddler:

GET http://www.hulu.com/ HTTP/1.1
Accept: image/gif, image/jpeg, image/pjpeg, application/x-ms-application, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*
Referer: http://www.hulu.com/
Accept-Language: de-DE,de;q=0.5
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; Trident/7.0; rv:11.0) like Gecko
Host: www.hulu.com
Connection: Keep-Alive

Notice the different User-Agent string after the registry changes.

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