jqGrid loadonce doesn't work with asp.net

Question

Does anyone know how to solve this nasty issue with asp.net+asmx+jqGrid sorting. Because, in order to call pagemethods or asmx web services from jqGrid, it needs to be hacke

Answer 1

I eventually gave up on JSON (with ASP.NET) and just used XML. Then everything just works. Make sure the return type from your asmx is XmlDocument

A good summary of everything you need to do to make it work (on the client side at least) can be found on the the JQGrid wiki

Look at their sample XML and make sure what your service returns a buffer (best to validate with Fiddler) that follows the same schema.

UPDATE - Some Code samples

Here is the client side script to create the grid

     var mygrid = $("#list").jqGrid({
      url: '../../webServices/callsGridService.asmx/getCallsGridDataXML?nd=' + new Date().getTime(),
      datatype: 'xml',
      mtype: 'POST',
      contentType: "text/xml",
      colNames: ['Call ID', 'Date / Time', 'Duration'],
      colModel: [
      { name: 'callId', index: 'callId', align: "right", key: true },
  { name: 'callTime', index: 'callTime', sorttype: 'date' },
      { name: 'duration', index: 'duration', align: "right" }
    ],
      pager: $('#pager'),
      rowNum: 10,
      rowList: [10, 25, 50, 100],
      sortname: 'callTime',
      viewrecords: true,
      sortorder: "desc",
      height: "100%",
      multiselect: true,
      rownumbers: true,
      gridview: true,
      autowidth: true,
      caption: "Calls"
    })

And here is the service code (VB.NET):

  Public Function getCallsGridDataXML() As XmlDocument
    Dim xmlRet As New XmlDocument
    Dim ret As New StringBuilder

    m_pageNum = CInt(HttpContext.Current.Request.Form.Item("page"))
    If m_pageNum = Nothing OrElse m_pageNum = 0 Then
      m_pageNum = 1
    End If
    m_pageSize = CInt(HttpContext.Current.Request.Form.Item("rows"))
    If m_pageSize = Nothing OrElse m_pageSize = 0 Then
      m_pageSize = 10
    End If
    m_sortItem = CStr(HttpContext.Current.Request.Form.Item("sidx"))
    m_sortOrder = CStr(HttpContext.Current.Request.Form.Item("sord"))

    Dim dt As DataTable
    dt = Session(SESSION_CALLS_GRID_DATA)

    Dim myView As DataView = dt.DefaultView
    If m_sortItem IsNot Nothing AndAlso m_sortOrder IsNot Nothing Then
      myView.Sort = m_sortItem & " " & m_sortOrder
    End If

    ret.Append("")
    ret.Append("")
    ret.Append("" & m_pageNum & "")
    ret.Append("" & Math.Floor(dt.Rows.Count / m_pageSize) & "")
    ret.Append("" & dt.Rows.Count & "")

    For i As Integer = (m_pageNum - 1) * m_pageSize To Math.Min(dt.Rows.Count - 1, m_pageNum * m_pageSize - 1)
      ret.Append("")
      Dim cellCount As Integer = 0

      ret.Append("" & Server.HtmlEncode(myView(i)("callId")) & "")
      ret.Append("" & Server.HtmlEncode(myView(i)("callTime")) & "")
      ret.Append("" & Server.HtmlEncode(myView(i)("duration")) & "")

      ret.Append("")
    Next

    ret.Append("")
    xmlRet.LoadXml(ret.ToString)
    Return xmlRet
   End Function

You can see I'm building the XML as a string and then loading it into the XMLDocumennt. I can't say I know this is the best way. You could build the XML DOM directly on the document.