Question

javascript object required, unknown name

Asked by: mattegol

I've been asked to add a option in a dropdownlist in a form applikation. The dropdownlist is populated with other control types like textbox, textarea, radio, checkbox, and so on.. the dropdownlist has autopostback="true" and the selected control should trigger dynamically and be visible on the page, you can choose textbox 10 times for example.

My problem is: I have added the new control in the dropdownlist and replicated it like the others are built but now when the autopostback triggers i get these javascript errors: object required and unknown name, I don't have any code to show because it is at work, I'm hoping you can give me some advise on what may cause this.

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Asked On: 2009-05-08 at 10:32:52ID24393205
Tags: asp.net
,; vb
,; javascript
Topics: VB Controls
,; Programming for ASP.NET
Participating Experts: 1
Points: 500
Comments: 19

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Answers

by: prairiedogPosted on 2009-05-08 at 11:57:14ID: 24339116

Please delete the duplicate question first.

by: mattegolPosted on 2009-05-08 at 12:08:52ID: 24339217

deleted!

by: prairiedogPosted on 2009-05-08 at 12:12:28ID: 24339256

Launch your app in FireFox, when the javascript error comes up, check the Error Console to see which line of code causes the error.

Without code, it is hard to debug.

by: mattegolPosted on 2009-05-08 at 12:17:12ID: 24339307

I tested it earlier in FireFox but no error was shown, the autopostback did not work though.

by: prairiedogPosted on 2009-05-08 at 12:21:59ID: 24339337

Hmm, strange.

You will need to post some code so we can understand your problem better.

by: mattegolPosted on 2009-05-08 at 12:47:09ID: 24339555

This is Page_Load section

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        '*********
        'first we check if the user is logged in. If not sent to LogIn page.
        'then we check that there is an eventid available. If not sent to register new event page.
        '****************
        Try
            If Session("Logged") = True Then
                'only proceed if event is not published
                If Session("EvPublished") <> "yes" Then
 
 
                    Dim strHeading As String
                    Dim lst As String = "" 'holds name of listbox to process
                    'strHeading = "Edit Reg Form"
                    'lblHeading.Text = strHeading
 
                    btnSave.Attributes.Add("onclick", "return ValErrorText();")
 
                    '******
                    'only show possibility of adding drop down options if that type of control is chosen
                    '******
                    dropoptions.Visible = False
                    radiooptions.Visible = False
                    regExpError.Visible = False
                    regExpMinMax.Visible = False
                    allocation.Visible = False
                    valrequired.Visible = True
                    reqErrorText.Visible = True
                    cctypelabel.Visible = False
                    ccNrLabel.Visible = False
                    ccDateLabel.Visible = False
                    ccCvcLabel.Visible = False
                    ccNrError.Visible = False
                    ccCVCError.Visible = False
                    chkShowCvC.Visible = False
                    txtarealabel.Visible = False
                    TextArea.Visible = False
                    help.Visible = True
                    frmlabel.Visible = True
                    frmEvalVal1Txt.visible = False
                    frmEvalVal2Txt.visible = False
                    frmEvalNrOptions.Visible = False
                        frmEvalQuestion.Visible = False
                        linkTextLabel.Visible = False
                        linkLabel.Visible = False
 
 
                    If Session("Eventid") > 0 Then
 
                        'check to see if a query string is coming in
                        'if so populate controls and put form in update mode
                        'this is fired from the dynamic edit buttons created on screen
                        If Not IsPostBack Then
                            If Request.QueryString.Count > 0 Then
                                Dim iControlid As Integer
 
                                iControlid = Request.QueryString("CID")
 
                                PopControls(iControlid)
                                ltlSaveFlag.Text = "Update"
                                ltlControlId.Text = iControlid
                                ddlControlType.Enabled = False
 
                            End If
                        End If
 
                        'build the preview at the bottom of page
                        BuildForm(Session("Eventid"), tdContainer, True, False)
 
 
                        If IsPostBack Then
 
                            Select Case ddlControlType.SelectedValue.ToUpper
 
                                Case "DROPDOWN"
 
                                    dropoptions.Visible = True
 
                                Case "RADIO"
                                    radiooptions.Visible = True
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
 
                                Case "CHECK"
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
 
                                Case "FIXED LENGTH", "MAX LENGTH"
                                    regExpError.Visible = True
                                    regExpMinMax.Visible = True
 
                                Case "NUMERIC"
                                    regExpError.Visible = True
 
                                Case "EMAIL"
                                    regExpError.Visible = True
 
                                Case "ALLOCATION"
                                    allocation.Visible = True
                                    regExpError.Visible = True
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
 
                                Case "SINGLEALLOCATION"
                                    allocation.Visible = True
                                    regExpError.Visible = True
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
 
                                Case "CREDITCARD"
 
                                    frmlabel.Visible = False
                                    cctypelabel.Visible = True
                                    ccNrLabel.Visible = True
                                    ccDateLabel.Visible = True
                                    ccCvcLabel.Visible = True
                                    ccNrError.Visible = True
                                    ccCVCError.Visible = True
                                    chkShowCvC.Visible = True
 
                                Case "SECTIONHEADER"
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
                                    help.Visible = False
 
                                Case "SUBSECTIONHEADER"
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
                                    help.Visible = False
 
                                Case "TEXTAREA"
                                    txtarealabel.Visible = True
                                    TextArea.Visible = True
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
                                    help.Visible = False
                                    frmlabel.Visible = False
 
                                Case "EVALUATION OPTIONS"
                                    radiooptions.Visible = False
                                    valrequired.Visible = False
                                    reqErrorText.Visible = False
                                    frmlabel.Visible = True
                                    frmEvalVal1Txt.Visible = True
                                    frmEvalVal2Txt.Visible = True
                                    frmEvalNrOptions.Visible = True
                                        frmEvalQuestion.Visible = True
 
                                    Case "LINK"
                                        'regExpError.Visible = True
                                        txtLinkText.Visible = True
                                        txtLink.Visible = True
                                        valrequired.Visible = False
                                        reqErrorText.Visible = False
                                        help.Visible = False
                                        frmlabel.Visible = False
 
                                End Select
 
 
                        End If

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Select all Open in new window

by: mattegolPosted on 2009-05-08 at 12:57:50ID: 24339661

controls

<tr>
		<td class="header" colSpan="2">Edit Form
		</td>
	</tr>
	<TR>
		<td colSpan="2"><IMG height="10" src="../../images/shim.gif"></td>
	</TR>
	<TR>
		<TD class="label" width="200"><asp:label id="Label1" runat="server">Choose Control Type:</asp:label></TD>
		<TD class="label" width="400"><asp:dropdownlist id="ddlControlType" runat="server" Width="300" AutoPostBack="True" CssClass="Companylist"></asp:dropdownlist></TD>
	</TR>
	<tr id="radiooptions" runat="server">
		<td class="label" vAlign="top" width="200"><asp:label id="Label7" runat="server">Enter Control Options:</asp:label></td>
		<td width="400"><asp:textbox id="txtradvalue1" runat="server"></asp:textbox>&nbsp;&nbsp;
			<asp:textbox id="txtradvalue2" runat="server"></asp:textbox></td>
	</tr>
	<tr id="dropoptions" runat="server">
		<td class="label" vAlign="top" width="200"><asp:label id="Label6" runat="server">Enter Control Options:</asp:label></td>
		<td width="400">
			<TABLE id="Table2" cellSpacing="1" cellPadding="1" width="400" border="0">
				<TR>
					<TD class="label" vAlign="top" width="270"><asp:textbox id="txtDropOption" runat="server"></asp:textbox>&nbsp;<A onclick="popListBox();" href="#"><IMG src="../../images/plus.gif" border="0"></A>
						&nbsp;<A onclick="DeleteListItem();" href="#"><IMG src="../../images/minus.gif" border="0"></A></TD>
					<TD class="label" width="170"><asp:listbox id="lstDropOption" runat="server" Width="170" CssClass="Companylist" SelectionMode="Multiple"></asp:listbox></TD>
				</TR>
			</TABLE>
		</td>
	</tr>
	<tr id="allocation" runat="server">
		<td>Enter Allocation Amt:</td>
		<td><asp:textbox id="txtAllocationAmt" runat="server" Width="50px"></asp:textbox></td>
	</tr>
	<TR id="regExpMinMax" runat="server">
		<TD class="label" vAlign="top" width="200">Enter Min/Max Value:</TD>
		<TD width="400"><asp:textbox id="txtMin" runat="server" Width="50px"></asp:textbox>&nbsp;
			<asp:textbox id="txtMax" runat="server" Width="50px"></asp:textbox></TD>
	</TR>
	<TR id="regExpError" runat="server">
		<TD class="label" vAlign="top" width="200">Enter Error Text.</TD>
		<TD width="400"><asp:textbox id="txtErrorText" runat="server" Width="300px" MaxLength="500"></asp:textbox></TD>
	</TR>
	<TR id="rptlabel" runat="server">
		<TD class="label" width="200"><asp:label id="Label5" runat="server">Enter Control Name:</asp:label></TD>
		<TD class="label" width="400"><asp:textbox id="txtCtlName" runat="server" Width="300" MaxLength="50"></asp:textbox></TD>
	</TR>
	<TR id="frmlabel" runat="server">
		<TD class="label" width="200"><asp:label id="Label2" runat="server">Enter Label Text:</asp:label></TD>
		<TD class="label" width="400"><asp:textbox id="txtControlLabel" runat="server" Width="300" MaxLength="500"></asp:textbox></TD>
	</TR>
	<!--Evaluation controls-->
	<TR id="frmEvalVal1Txt" runat="server">
		<TD class="label" width="200"><asp:label id="Label8" runat="server">Enter Left Text:</asp:label></TD>
		<TD class="label" width="400"><asp:textbox id="txtEvalVal1Txt" runat="server" Width="300" MaxLength="500"></asp:textbox></TD>
	</TR>
	<TR id="frmEvalVal2Txt" runat="server">
		<TD class="label" width="200"><asp:label id="Label9" runat="server">Enter Right Text:</asp:label></TD>
		<TD class="label" width="400"><asp:textbox id="txtEvalVal2Txt" runat="server" Width="300" MaxLength="500"></asp:textbox></TD>
	</TR>
	<TR id="frmEvalQuestion" runat="server">
		<TD class="label" width="200"><asp:label id="Label10" runat="server">Enter Question:</asp:label></TD>
		<TD class="label" width="400"><asp:textbox id="txtEvalQuestion" runat="server" Width="300" MaxLength="500"></asp:textbox></TD>
	</TR>
	<TR id="frmEvalNrOptions" runat="server">
		<TD class="label" vAlign="top" width="200">How many options?:(2-7):</TD>
		<TD width="400"><asp:textbox id="txtEvalOptions" runat="server" Width="50px"></asp:textbox></TD>
	</TR>
	<!--Credit Card Fields-->
	<tr id="cctypelabel" runat="server">
		<TD class="label" vAlign="top" width="200">Enter Type Label:</TD>
		<TD width="400"><asp:textbox id="txtCCtypeLabel" runat="server" Width="300px" MaxLength="500"></asp:textbox></TD>
	</tr>
	<tr id="ccNrLabel" runat="server">
		<TD class="label" vAlign="top" width="200">Enter Nr Label:</TD>
		<TD width="400"><asp:textbox id="txtCCnrLabel" runat="server" Width="300px" MaxLength="100"></asp:textbox></TD>
	</tr>
	<tr id="ccNrError" runat="server">
		<TD class="label" vAlign="top" width="200">Enter Nr Error:</TD>
		<TD width="400"><asp:textbox id="txtCCNrError" runat="server" Width="300px" MaxLength="100"></asp:textbox></TD>
	</tr>
	<tr id="ccDateLabel" runat="server">
		<TD class="label" vAlign="top" width="200">Enter Date Label:</TD>
		<TD width="400"><asp:textbox id="txtCCDateLabel" runat="server" Width="300px" MaxLength="100"></asp:textbox></TD>
	</tr>
	<tr id="chkShowCvC" runat="server">
		<TD class="label" vAlign="top" width="200">Show CVC?:</TD>
		<TD class="label" width="400"><asp:checkbox id="chkCVC" runat="server"></asp:checkbox></TD>
	</tr>
	<tr id="ccCvcLabel" runat="server">
		<TD class="label" vAlign="top" width="200">Enter CVC Label:</TD>
		<TD width="400"><asp:textbox id="txtCVCLabel" runat="server" Width="300px" MaxLength="100"></asp:textbox></TD>
	</tr>
	<tr id="ccCVCError" runat="server">
		<TD class="label" vAlign="top" width="200">Enter CVC Error:</TD>
		<TD width="400"><asp:textbox id="txtCCCvcError" runat="server" Width="300px" MaxLength="500"></asp:textbox></TD>
	</tr>
	<!--End of CreditCard Fields-->
	<!--Link Fields-->
	<tr id="linkTextLabel" runat="server">
		<TD class="label" vAlign="top" width="200">Link text:</TD>
		<TD width="400"><asp:textbox id="txtLinkText" runat="server" Width="300px" MaxLength="500"></asp:textbox></TD>
	</tr>
	<tr id="linkLabel" runat="server">
		<TD class="label" vAlign="top" width="200">Link:</TD>
		<TD width="400">
		    <asp:textbox id="txtLink" runat="server" Width="300px" MaxLength="500"></asp:textbox>
            <!--<asp:RegularExpressionValidator ID="RegularExpressionValidator1" ControlToValidate="txtLink" ValidationExpression="((https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\\\))+[\w\d:#@%/;$()~_?\+-=\\\.&]*)" runat="server" ErrorMessage="Ange en giltig adress" />-->
		</TD>
	</tr>
 
	<!--End of Link Fields-->
	<TR id="valrequired" runat="server">
		<TD class="label" width="200"><asp:label id="Label3" runat="server">Is it Required:</asp:label></TD>
		<TD class="label" width="400"><asp:radiobutton id="rbYes" runat="server" GroupName="grpYesNo" Text="Yes"></asp:radiobutton><asp:radiobutton id="rbNo" runat="server" GroupName="grpYesNo" Text="No"></asp:radiobutton></TD>
	</TR>
	<TR id="reqErrorText" runat="server">
		<TD class="label" width="200"><asp:label id="lblRequiredText" runat="server">Required Error Text:</asp:label></TD>
		<TD class="label" width="400"><asp:textbox id="txtReqError" runat="server" Width="300" MaxLength="500"></asp:textbox></TD>
	</TR>
	<TR id="help" runat="server">
		<TD class="label" vAlign="top" width="200"><asp:label id="Label4" runat="server">Help Text:</asp:label></TD>
		<TD class="label" width="400"><asp:textbox id="txtHelpText" runat="server" Width="300" MaxLength="100" TextMode="MultiLine"></asp:textbox></TD>
	</TR>
	<tr id="txtarealabel" runat="server">
		<td class="label" colSpan="2"><asp:label id="lblTxtArea" Runat="server">Text:</asp:label></td>
	</tr>
	<tr id="TextArea" runat="server">
		<td class="label" colSpan="2"><asp:textbox id="txtTextArea" runat="server" Width="500" MaxLength="2000" TextMode="MultiLine"
				height="85"></asp:textbox></td>
	</tr>
	<TR>
		<td style="HEIGHT: 5px" colSpan="2"><IMG height="5" src="../../images/shim.gif">&nbsp;<INPUT id="lblList" type="hidden" runat="server"></td>
	</TR>
	<TR>
		<TD align="center" colSpan="2"><asp:button id="btnSave" runat="server" Text="Save"></asp:button>&nbsp;&nbsp;
			<asp:literal id="ltlSaveFlag" runat="server" Visible="False"></asp:literal><asp:literal id="ltlControlId" runat="server" Visible="False"></asp:literal></TD>
	</TR>
	<TR>
		<td colSpan="2"><IMG height="15" src="../../images/shim.gif">&nbsp;</td>
	</TR>
	<tr>
		<td class="header" colSpan="2">View Results
		</td>
	</tr>
	<TR>
		<td colSpan="2"><IMG height="10" src="../../images/shim.gif"></td>
	</TR>
</TABLE>
<table id="tblFormResult" cellSpacing="1" cellPadding="1" width="600" border="0">
	<tr>
		<td id="tdContainer" runat="server"></td>
	</tr>
</table>

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Select all Open in new window

by: prairiedogPosted on 2009-05-08 at 13:00:36ID: 24339691

Strange, there is no JavaScript code in the code you provided. Do you have JavaScript code in ASPX file?

by: mattegolPosted on 2009-05-08 at 13:09:50ID: 24339783

the last code was from an user control

here is the aspx:

<%@ Register TagPrefix="uc1" TagName="ucMenu" Src="../EditControls/ucMenuEditEvent.ascx" %>
<%@ Register TagPrefix="uc1" TagName="ucEditForm" Src="../EditControls/ucEditForm.ascx" %>
<%@ Register TagPrefix="uc1" TagName="ucFooter" Src="../MainControls/ucFooter.ascx" %>
<%@ Register TagPrefix="uc1" TagName="ucHeader" Src="../MainControls/ucHeader.ascx" %>
<%@ Page Language="vb" AutoEventWireup="false" Inherits="RegisterForEvent.EditForm" CodeFile="EditForm.aspx.vb" %>
<HTML>
	<HEAD>
		<title>Edit Existing Event</title>
		<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
		<meta content="Visual Basic .NET 7.1" name="CODE_LANGUAGE">
		<meta content="JavaScript" name="vs_defaultClientScript">
		<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
		<LINK href="../../Styles.css" type="text/css" rel="stylesheet">
		<script language="javascript">
		
function popListBox(){
 
				var lBox=document.getElementById('ucEditForm:lstDropOption');
				var tBox = document.getElementById('ucEditForm:txtDropOption');
				var tValue = tBox.value
				var iIndex = lBox.options.length;
				if (tValue == "") {
				alert("You need to enter a value");
				}
				else
				lBox.options[iIndex]=new Option(tValue,iIndex+1);
				lBox.options[iIndex].value=tValue
				}
				
function popAllocationListBox(){
 
				var lBox=document.getElementById('ucEditForm:lstAllocation');
				var tAllBox = document.getElementById('ucEditForm:txtAllocationItem');
				var tAmtBox = document.getElementById('ucEditForm:txtAllocationAmt');
				var tAllValue = tAllBox.value
				var tAmtValue = tAmtBox.value
				
				
				var iIndex = lBox.options.length;
				if ((tAllValue == "")||(tAmtValue == "")) {
				alert("You need to enter an allocation Item and Amount");
				return false
				}
				else
				var lstValue = tAllBox.value + " " + "(" + tAmtBox.value + ")"
				lBox.options[iIndex]=new Option(lstValue,iIndex+1);
				lBox.options[iIndex].value=lstValue
				}
				
	function SelectAllItems(sList)
				{
		var el = document.getElementById(sList)
		var intCount=el.options.length;
		for(i = 0; i < intCount;i++)
		{
			el.options(i).selected=true;
		}
		}
		
	function DeleteListItem()
		{
				var lBox=document.getElementById('ucEditForm:lstDropOption');
				var iSelIndex =lBox.selectedIndex
				if(iSelIndex ==-1){
				alert("You need to selected an item to delete");
				return false
				}
				else
				lBox.remove(iSelIndex);
		}
		
function ValErrorText()
				{
				var op = document.getElementById("ucEditForm_rbYes")
				var tx = document.getElementById("ucEditForm_txtReqError")
					if(op.checked==true){
 
						if (tx.value.length < 1)
							{
							alert("You must add a validation error message.")
							return false;
							}
							else
							{
							
							return true;
							}
							}
				}
		</script>
	</HEAD>
	<body>
		<form id="Form1" method="post" onsubmit="SelectAllItems('ucEditForm:lstDropOption');"
			runat="server">
			<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="760" border="0">
				<TR>
					<TD colSpan="2"><uc1:ucheader id="ucHeader" runat="server"></uc1:ucheader></TD>
				</TR>
				<TR>
					<td colSpan="2"><IMG height="5" src="../../images/shim.gif"></td>
				</TR>
				<TR>
					<TD vAlign="top" width="160"><uc1:ucmenu id="ucMenu" runat="server"></uc1:ucmenu></TD>
					<td width="500"><uc1:uceditform id="ucEditForm" runat="server"></uc1:uceditform></td>
				</TR>
				<TR>
					<td colSpan="2"><IMG height="200" src="../../images/shim.gif"></td>
				</TR>
				<TR>
					<TD colSpan="2"><uc1:ucfooter id="ucFooter" runat="server"></uc1:ucfooter></TD>
				</TR>
			</TABLE>
		</form>
	</body>
</HTML>

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Select all Open in new window

by: prairiedogPosted on 2009-05-08 at 13:23:42ID: 24339893

Line 93 is calling the JavaScript function by passing in 'ucEditForm:lstDropOption', but if 'ucEditForm:lstDropOption' is invisible, then when you do getElementById, you will get the JavaScript error as you mentioned in your question.

by: mattegolPosted on 2009-05-08 at 13:30:16ID: 24339952

So the controls can't be Visible="false" is that what you are saying?

by: prairiedogPosted on 2009-05-08 at 13:34:22ID: 24339982

Yes, if Visible="False", then ASP.NET will not render it to browser, then JavaScript will not find it because it does not exist in the HTML. you can check it by viewing the Page Source in your browser.

by: mattegolPosted on 2009-05-08 at 13:39:24ID: 24340019

But it has been working fine before in .net 1.1. Is there a difference in the later versions?

by: prairiedogPosted on 2009-05-08 at 13:45:14ID: 24340066

It should not be different. I don't know why it worked before but not working now. Mayber there are some changes in your application? Still launch your app in FireFox, then click Tools->Error Console to see the JavaScript error. Click the link of the error will show you which line is causing the JavaScript error.

by: mattegolPosted on 2009-05-08 at 13:54:13ID: 24340146

I made some of the controls visible and then it worked, but now I just have to figure out how many of them can be invisible..

by: mattegolPosted on 2009-05-08 at 14:39:43ID: 24340524

If I just set lstDropOption to visible all of the others work too, I just can't figure out why it worked before? Thanks, I'm almost there and i appreciate your help

by: prairiedogPosted on 2009-05-08 at 14:45:30ID: 24340572

Yes, it is because there is only one place calls the JavaScript: Line 93, which is eventually looking for lstDropOption. It has nothing to do with other controls.

by: prairiedogPosted on 2009-05-08 at 14:55:14ID: 24340636

There is a trick for hiding the control. Instead of using Visible="False" to hide it, you can do this:

lstDropOption.Attributes.Add("style", "display:none;")

To make it visible again:

lstDropOption.Attributes.Add("style", "display:block;")

This way, ASP.NET will still render the control to browser, but the style will hide the cotnrol. Since it exists in HTML, it will not cause JavaScript error.

by: mattegolPosted on 2009-05-09 at 06:04:45ID: 31579554

Thank you prairiedog

20120131-EE-VQP-002

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javascript object required, unknown name

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