ModalPopup, UpdatePanel, Javascript "Object expected" Error in Internet Explorer RRS feed

  • Question

  • User1120190316 posted

    New information! The problem I describe below occurs only with Microsoft Internet Explorer. All others that I tested behaved as they should. Even Microsoft Edge handled it just fine. A lot of people use IE, so perhaps somebody knows a way to deal with the following problem

    A page in my asp.net web app has a modal popup which contains a listbox that must be populated on the fly.  The page contains a treeview control; right clicking a node on the treeview calls up a context menu; and if the user clicks on "Add Pretask", the popup form appears, listing items which vary depending upon which node was clicked.  

    The listbox is contained within an UpdatePanel which was inserted so that the list could be populated without reposting the entire page.  I developed this popup, tested it, and it appeared to be working properly.  I was patting myself on the back for a job well done when I happened to press a key on the computer keyboard.  The app crashed with the following error message:  

    "Unhandled exception at line 1010, column 1 in http://localhost:55109/PPM/ScriptResource.axd?d=8GNeJYrV145FFZwe3zZTQTMdSqo5ZWiNHMcMCdX41b_dp65omt53usfcChKlDkhIbPdehfLSEKVkXbwQruOiDLDfxhVjDQZOQZDVfHxfkhrBY3rHZVHxg2I6VQGIFSKL2AhGUprc1gW7X0t1_Q79OAckMdH-JliDUkID4lzcsT8Bfkxn0&t=1e478eba

    0x800a138f - JavaScript runtime error: Object expected"

    I have been wrestling with this problem for days.  The popup will not tolerate any key strokes.  Thank you for any help you can offer.

    Here is the relevant markup:

         <a href="#" style="display:none;" onclick="javascript:return false" id="hidlinkAddPretask" 
        <cc1:ModalPopupExtender ID="mpePretask" runat="server"  PopupControlID="pnlPretask" TargetControlID="hidlinkAddPretask"
             CancelControlID="btnCancelPretask" ></cc1:ModalPopupExtender>
        <asp:Panel ID="pnlPretask" runat="server" CssClass="popupPanel" Width="40%">
            <!-- Panel within pnlPretask contains list of selected pretasks. -->
             <asp:panel runat="server" ID="pnlPretaskList" Visible="false">
                <asp:BulletedList ID="blPretasks" runat="server">
                    <asp:HiddenField runat="server" ID="hidPostTaskID" Visible="true" />
                    Before <b>"<asp:Label ID="lblAddPretask" runat="server"></asp:Label>"</b> can be completed, I must:
                    <br /><br />
            <asp:UpdatePanel ID="updPretask" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
                   <asp:ListBox ID="lboxPretask" runat="server" Width="80%" Height="200px"
                         ToolTip="Select one or more tasks that must be completed before..." AutoPostBack="false"
           <br /><br />
            <asp:UpdateProgress ID="UpdateProgress4" runat="server" DisplayAfter="0">
                    <img src="images/progress.gif" alt="" />&nbsp;Updating...</ProgressTemplate>
            <asp:Label runat="server" ID="lblErrPretask" Font-Bold="True" ForeColor="Red" />
            <br />
            <asp:Button ID="btnAddAnotherPretask" runat="server" Text="Save and Add Another" />
            <asp:Button ID="btnSavePretask" runat="server" Text="Save" />
            <asp:Button ID="btnCancelPretask" runat="server" Text="Cancel"   />

    The popup is called up from the server in vb:

                'Repopulate lboxPretask
                Dim ID As String = e.NodeClicked.Attributes("TaskID").ToString

    And the following routine populates the listbox:

    Private Sub PretaskSelectList(ByVal TaskID As Integer)
            'Populate drop down list lboxPretask with all Owner's undone, active tasks
            'that are not for TaskID is not a prerequisite.  
            Dim strConn As String = ConfigurationManager.ConnectionStrings("PPMConnectionString").ConnectionString
            Dim cnn As SqlConnection = New SqlConnection(strConn)
            'Get two result sets from uspPretaskPickList
            Dim sql As String = "execute dbo.uspPretaskPickList " & TaskID.ToString
            Dim cmd As SqlCommand = New SqlCommand(sql, cnn)
            'Result set #1 - Tasks from current Goal
            Dim rdr As SqlDataReader = cmd.ExecuteReader()
            Dim Itm As ListItem
            With lboxPretask
                .Enabled = True
                'Add a default item, #0
                Itm = New ListItem("ADD NEW TASK", "0")
                Itm.Attributes.Add("Style", "Font-Weight:Bold")
                'Insert a separator if data reader has any records
                Dim separator As New ListItem("-------------------------", "")
                separator.Attributes.Add("disabled", "true")
                If rdr.HasRows Then
                End If
                'Add each member of 1st result set, using lboxPretask.Items.Add(New ListItem(TaskName, TaskID))
                Do While rdr.Read
                    Itm = New ListItem(rdr("TaskName"), rdr("TaskID").ToString)
                    'Each item should be Bold. 
                    Itm.Attributes.Add("Style", "Font-Weight:Bold")
                'Add dividing line, Pretask.Items.Add("------------", "-1")
                separator.Attributes.Add("disabled", "true")
                'Results set #2 - Tasks from other or no goal
                'Add each member of 2nd result set, using lboxPretask.Items.Add(New ListItem(TaskName, TaskID))
                Do While rdr.Read
                    Itm = New ListItem(rdr("TaskName"), rdr("TaskID").ToString)
            End With
            rdr = Nothing
            cnn = Nothing
        End Sub

    Friday, April 3, 2020 12:08 PM

All replies

  • User-719153870 posted

    Hi Sheldon Penner,

    0x800a138f - JavaScript runtime error: Object expected

    The Object expected is usually a JS error, it happens when you attempted to invoke a method or property on an object of a type other than Object, or you passed an argument of a type other than Object when an Object was required.

    I could only share you some similar cases to help debug the code yourself since the code provided in your post is not enough to reproduce the issue.

    For example, in Object expected error in Internet Explorer, op makes his variable undefined when he call document.getElementById().

    And similar case in ERROR Object expected.

    Best Regard,

    Yang Shen

    Monday, April 6, 2020 6:38 AM