JavaScript函数中未定义的对象

问题描述

| 我有一个功能，该功能应基于下拉列表中选择的选项显示文本框。我已经用javascript写过，也正在使用usercontrols。这是javascript函数的特殊代码。

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)

    }

    }
}

.ascx文件代码，其中包含控件/文本框：

                  <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>

我试图调试此代码。此代码不检查\'CHF \'的条件。它跳过了整个循环，并说变量\'Objtr_lbl_Healthy_Family_Member_Number \'没有对象/未定义？ 谢谢你的帮助。     

解决方法

IsValidObj试图访问未定义的变量Objtr_lbl_Healthy_Family_Member_Number。 createObj不返回对象。     ,我的第一个猜测是，没有看到

createObj()

函数，是 由于“ 3”不是有效的HTML标记名称，因此未在DOM中创建该元素 所以

createObj()

什么也做不了（也不会返回任何东西） 因此

var Objtr_lbl_Healthy_Family_Member_Number

是不确定的。