JavaScript Get report parameters as URL string birt report parameters query string,ssrs report parameters query string

I have an application that serves SSRS reports. A given report is accessed in the following way:

https://reportserver.com/reportname

Upon clicking View Report, a postback is submitted to the report server with the user-defined parameters. I need to grab these user-defined parameters and parse them as a URL string.

Desired result: https://reportserver.com/reportname?param1=foo&param2=bar

I found this doc that gets me close to what I need. This method should allow me to grab all visible parameters and parse them myself, but I need hidden parameters as well.

How can I build this parameter string? We're using JavaScript/jQuery in the front end so it may be possible to grab this client-side before the POST, but I haven't found a way of doing this either.

Answer:1

I got it working. Fair warning: I'm new to ASP.NET so this is likely not an ideal solution.

I added an event handler to the report viewer control's code behind. This queries the execution log, grabbing the parameters selected most recently by the user. It is meant to be triggered when a button called "Save Report" is clicked. If you try to handle this with a Load or PreRender event handler it will fire before the row has a chance to insert into the database, giving you the result of the user's second most recent execution parameters.

Define the Button (.ascx file)

  <asp:LinkButton ID="SaveReportButton" runat="server" title="Save this Report"></asp:LinkButton>

Add event handler to code behind (.ascx.vb file)

Protected Sub SaveReportButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SaveReportButton.Click
  Dim conn As New SqlConnection(<connection string here>)
  Dim cmd As New SqlCommand("SELECT TOP 1 Parameters FROM [ReportServer].[dbo].[ExecutionLogStorage] WHERE <qualify on user, timestamp, etc. here>", conn)
  cmd.Parameters.AddWithValue(<query parameter here>)
  conn.Open()
  Dim result = cmd.ExecuteScalar()

  ' Prevents NullReferenceException from result.ToString() in case no result is found
  If (result IsNot Nothing)

    ' Redirect based on parameter string retrieved from log
    Response.Redirect(HttpContext.Current.Request.Url.AbsoluteUri & "?" & result.ToString())

  End If
  conn.Close()
End Sub

Call postback from JavaScript on button click

<li>
  <a target='_blank' href=\'javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(<reference SaveReportButton with appropriate arguments>)\' id="SaveReportButton" title="Save Report">
  Save Report
  </a>
</li>

Documentation on WebForm_DoPostBackWithOptions() and WebForm_PostBackOptions() is sparse, but a colleague has already done it this way so I followed suit for consistency's sake because it works.

Answer:2

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