Javascript function call from ASP .NET Hyperlink NavigateURL property

I have a ASP table that I create dynamically on the page load event. In that event, I populate the ASP table with titles and then a ASP .NET Hyperlink control that points to a .ashx page to serve up a file for the client to download.

For particular files (image files), I'd like to kick off a javascript function to open a new window with that file displayed in it. I have all the code to do this, but I can't get my Javascript function to work in the hyperlink NavigateURL property. I'm very new to Javascript, so I'm not sure what I'm missing. Can I do what I'm trying to? Can I not use the table control?

ASP code behind

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim iWineID As Integer

    If Not Integer.TryParse(Request.Params("WineID"), iWineID) Then Throw New InvalidOperationException("Invalid request")
    Me.lblWineName.Text = Utils.GetWineName(iWineID)
    Dim dtDocs开发者_如何学C As New dsDocs.docsDataTable

    Using taDocs As New dsDocsTableAdapters.docsTableAdapter
        dtDocs = taDocs.GetDataByProdIDOrWineID((Utils.GetProducerIDByWineID(iWineID)), True, iWineID)
    End Using

    If dtDocs.Rows.Count = 0 Then
        Me.lblDocsFound.Text = "No documents available for this wine."
    Else
        Me.NumberDocs(dtDocs)

        For Each drDoc As dsDocs.docsRow In dtDocs
            Dim myRow As New TableRow
            Dim myTitleCell As New TableCell
            Dim myDLCell As New TableCell
            Dim myHL As New HyperLink
            Select Case drDoc.doc_type_id
                'window.open('preview.aspx?WineID=' + nWineID', 'height=' + nWindowHeight + ',width=' + nWindowWidth + ',status=no,toolbar=no,menubar=no,location=no,scrollbars=' + bScrollbars + ',resizable=' + bScrollbars + ',titlebar=no');
                Case Constants.DocType.BottleShot, Constants.DocType.Label, Constants.DocType.Logo
                    myHL.NavigateUrl = "javascript:OpenPrev('" & drDoc.doc_id & "');return false;" '"javascript:window.open('~/Home/docpreview.aspx?DocID=" & drDoc.doc_id '& "','_blank', 'height=600, width=600,status=no,toolbar=no,menubar=no,location=no,scrollbars=no,resizable=no,titlebar=no'"
                    '"~/Home/docpreview.aspx?DocID=" & drDoc.doc_id
                    myHL.Text = "View"
                Case Else
                    myHL.NavigateUrl = "~/Home/docs.ashx?DocID=" & drDoc.doc_id
                    myHL.Text = "Download"
            End Select

            myTitleCell.Text = StrConv(drDoc.doc_type_name, VbStrConv.ProperCase)
            myDLCell.Controls.Add(myHL)
            myRow.Cells.Add(myTitleCell)
            myRow.Cells.Add(myDLCell)
            Me.tableDocs.Rows.Add(myRow)
        Next
    End If
End Sub

Javascript

function OpenPrev(DocID){

var objWin
var myURL

alert("GO!");
myURL='~/Home/docpreview.aspx?DocID=' + DocID;
objWin=window.open(myURL, 'Doc View', 'width=600,height=600,resizable=no,scrollbars=yes,toolbar=no');
}

You need to first resolve the URL.

Try changing any place where you set the NavigateURL like:

myHL.NavigateUrl = "~/Home/docs.ashx?DocID=" & drDoc.doc_id

To:

myHL.NavigateUrl = HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Authority + HttpContext.Current.Request.ApplicationPath + "Home/docs.ashx?DocID=" & drDoc.doc_id

@JoeEnos - That's definitely part of it. Try using something like 'http://www.google.com' as myURL and see. what happens.

And view the source of the HTML page and see what the generated hyperlinks look like. The href attribute will probably look wrong.