ASP check request method

How do i check if my form has been submitted in class开发者_StackOverflow中文版ic ASP?

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First, you can check, if Request.ServerVariables("REQUEST_METHOD")= "POST". That is, assuming, you use POST method to submit the form, the initial load will have GET method, the subsequent submits will be POST.

You can also add a hidden field in your form, if that variable is set in POST data (Request.Form object), you will know it is a postback, otherwise it is the first load.

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Function IsPostBack()
  IsPostBack = false    
  If Request.ServerVariables("REQUEST_METHOD") <> "POST" Then
    Exit Function       
  End If
  Dim referer: referer = Request.ServerVariables("HTTP_REFERER")
  Dim current: current = Request.ServerVariables("HTTP_ORIGIN") & Request.ServerVariables("SCRIPT_NAME")
  Dim i: i = InStr(1, referer, "?", 1)
  If i > 1 Then
    referer  = Left(referer, i - 1)
  End If
  IsPostBack = LCase(current) = LCase(referer)
End Function