How do I keep a HtmlDocument event handler attached when Javascript changes the HtmlDocument

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VB

web_browser

HtmlDocument

Hello everyone,

I'm having trouble with the WebBroser control. I'm using it to display a webpage from our MES system. The application is used to integrate peripherals such as a scanner.

Currently we're supporting scanners through a COM port. We want to add support for USB scanners. USB scanners act like a keyboard in order to capture the data we must handle the KeyDown event in the HtmlDocument (it is alway's displayed).

I found some code in order to attach my event handler:

Private Sub NewBrowser_DocumentComplete(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles NewBrowser.DocumentCompleted

   Dim document As HtmlDocument = NewBrowser.Document
   AddHandler document.Body.KeyDown, New HtmlElementEventHandler(AddressOf USBscan_KeyPress)

End Sub

This works wonderfull, untill some Javascript code changes the contents of the web page. When this happens, the event handler is dropped and I don't receive the keyboard events.

Is there a way to change this behaviour? Can I use another event to keep my event handler attached?

Thanks in advance!


Kind regards,
Bob Stanneveld