我一直在使用一个计时器,只是在一个特定的内容元素的变化观察。
Private AJAXTimer As New Timer
Private Sub WaitHandler1(ByVal sender As Object, ByVal e As System.EventArgs)
'Confirm that your AJAX operation has completed.
Dim ProgressBar = Browser1.Document.All("progressBar")
If ProgressBar Is Nothing Then Exit Sub
If ProgressBar.Style.ToLower.Contains("display: none") Then
'Stop listening for ticks
AJAXTimer.Stop()
'Clear the handler for the tick event so you can reuse the timer.
RemoveHandler AJAXTimer.Tick, AddressOf CoveragesWait
'Do what you need to do to the page here...
'If you will wait for another AJAX event, then set a
'new handler for your Timer. If you are navigating the
'page, add a handler to WebBrowser.DocumentComplete
End If
Exit Sub
Private Function InvokeMember(ByVal FieldName As String, ByVal methodName As String) As Boolean
Dim Field = Browser1.Document.GetElementById(FieldName)
If Field Is Nothing Then Return False
Field.InvokeMember(methodName)
Return True
End Function
我的AJAX命令通常如下所示:
AddHandler AJAXTimer.Tick, AddressOf WaitHandler1
InvokeMember("ContinueButton", "click")
AJAXTimer.Start
AddHandler Browser1.DocumentComplete, AddressOf AddSocialDocComp
Browser1.Navigate(NextURL) 'or InvokeMember("ControlName", "click") if working on a form.
