Object 在 JavaScript function 中未定义

Question

I have a function which should display a textbox based on an option selected in a dropdown list. I have writen this in javascript, also I am using usercontrols. here is the partical code of javascript function.

function showhideeffectivedate(objIncType)
{
    var inctype=objIncType.value;   

    if(inctype=='AMC'||inctype=='AMCW'||inctype=='CMC'||inctype=='CMCHF'||inctype=='CHF')
    {


        var Objtr_lbl_Healthy_Family_Member_Number = createObj("tr_lbl_Healthy_Family_Member_Number");

        if(IsValidObj(Objtr_lbl_Healthy_Family_Member_Number))
        {  

         if(inctype=='CHF')
         {

         HideAreaCrossBrowser('tr_lbl_Healthy_Family_Member_Number',false)
         }
           else
         HideAreaCrossBrowser('tr_lbl_Healthy_Family_Member_Number',true)
            healthyfamilyMemberCheck()            
        }



    }
    else
    {


    var Objtr_lbl_Healthy_Family_Member_Number = createObj('tr_lbl_Healthy_Family_Member_Number');

    if(IsValidObj(Objtr_lbl_Healthy_Family_Member_Number))
    {
        HideAreaCrossBrowser('tr_lbl_Healthy_Family_Member_Number',true)

    }

    }
}

the.ascx file code which contains the control/textbox:

                  <tr class="Content" id="tr_lbl_Healthy_Family_Member_Number">
                    <td valign="top" colspan="2">
                        <table cellspacing="0" border="0">
                            <tr>
                                <td class="Content" align="right" id="td_lbl_Healthy_Family_Member_Number" width="130px">
                                    <asp:Label ID="lbl_Healthy_Family_Member_Number" CssClass="Content" runat="server" Text="Healthy Family Member Number" />&nbsp;
                                </td>
                                <td class="Content" align="left" id="td_txt_Healthy_Family_Member_Number" width="185px">
                                    <%--<asp:HiddenField runat="server" Value="td_txt_Healthy_Family_Member_Number" ID="hdn_help_11999" />--%>
                                    <asp:TextBox ID="txt_Healthy_Family_Member_Number" CssClass="inputbox" onblur="" runat="server"
                                        Enabled="True" />
                                </td>
                            </tr>
                        </table>
                    </td>
                </tr>

I tried to debug this code. This code does not check for if condition of 'CHF'. It skips the entire loop and says that the variable 'Objtr_lbl_Healthy_Family_Member_Number' has no object/undefined?

Thanks for your help.

Answer 1

IsValidObj is attempting to access the variable Objtr_lbl_Healthy_Family_Member_Number which is undefined.

createObj is not returning an object.

Answer 2

My first guess, without seeing the createObj() function, is that

• since Objtr_lbl_Healthy_Family_Member_Number is not a valid HTML tag name, that element is not being created in the DOM
• so createObj() can't do anything (and won't return anything)
• so var Objtr_lbl_Healthy_Family_Member_Number is therefore undefined.