HtmlWindow.Error Event

 

Occurs when script running inside of the window encounters a run-time error.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

Public Event Error As HtmlElementErrorEventHandler

HTML pages can contain script code, usually written in JScript or VBScript, that executes when a page is loaded. Error occurs whenever a script encounters a run-time error. Because script code is late-bound, which means that calls against the object are not resolved until run-time, errors can include everything from referencing a null object to calling an undefined property or method.

You can set the Handled property of HtmlElementErrorEventArgs to true in order to prevent the native error dialog box in Internet Explorer from displaying.

For more information about the difference between canceling event bubbling and canceling the default action on an event, see About the DHTML Object Model.

The following code example traps the error that results when a script on an HTML page attempts to access an object that is not defined in the document. The page must be fully loaded before the Error event handler is attached, otherwise the example will not work.

Dim WithEvents ScriptWindow As HtmlWindow

Private Sub SuppressScriptErrors()
    If (WebBrowser1.Document IsNot Nothing) Then
        ScriptWindow = WebBrowser1.Document.Window
    End If
End Sub

Private Sub ScriptWindow_Error(ByVal sender As Object, ByVal e As HtmlElementErrorEventArgs) Handles ScriptWindow.Error
    MessageBox.Show("Suppressed error!")
    e.Handled = True
End Sub

.NET Framework
Available since 2.0
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