验证失败 ASP.NET - 显示的元素会更改可见性

我有一个客户端Javascript，我在 ASP.NET 页面中使用，用于设置数据列表中几个项目的可见性。基本上，当项目 1 可见时，项目 2 应该隐藏，反之亦然。此代码还启用/禁用某些必需 ASP.NET 字段验证程序，具体取决于客户端周围字段的可见性。

除非我有 ASP.NET 验证错误，否则代码工作正常。验证失败时，字段将重置为其默认可见性（隐藏）。

我已经排除了这是回发，因为出现问题时我的服务器端断点不会被命中。这似乎是客户端脚本的问题。

服务器端修复已出来，因为页面永远不会回发。我想知道如何从 Javascript 的角度来看做到这一点？有没有办法在验证脚本触发时触发自定义代码？

我想过使用 cookie，但我认为这对我没有帮助，除非我可以挂接到验证事件。

代码如下...

function handleDropDown(e, a, b, c, v1, v2, h1, h2) {
    var i = parseInt(c) + 2;
    var x = parseInt(c) + 3;
    if (e.value == "Yes") {
        document.getElementById(i).style.display = "inline";
        document.getElementById(i).style.visibility = "visible";
        document.getElementById(x).style.display = "none";
        document.getElementById(x).style.visibility = "hidden";
        document.getElementById(a).focus();
        //Enable validator if needed
        var oVal1 = document.getElementById(v1);
        var oVal2 = document.getElementById(v2);
        var oVis1 = document.getElementById(h1);
        var oVis2 = document.getElementById(h2);
        ValidatorEnable(oVal1, true);
        if (oVis1 != null) {
            oVis1.value = "true";
        }
        ValidatorEnable(oVal2, false);
        if (oVis2 != null) {
            oVis2.value = "false";
        }
       }
    else if (e.value == "No") {
        document.getElementById(x).style.display = "inline";
        document.getElementById(x).style.visibility = "visible";
        document.getElementById(i).style.display = "none";
        document.getElementById(i).style.visibility = "hidden";
        document.getElementById(b).focus();
        //Enable validator if needed
        var oVal1 = document.getElementById(v1);
        var oVal2 = document.getElementById(v2);
        var oVis1 = document.getElementById(h1);
        var oVis2 = document.getElementById(h2);
        ValidatorEnable(oVal1, false);
        if (oVis1 != null) {
            oVis1.value = "false";
        }
        ValidatorEnable(oVal2, true);
        if (oVis2 != null) {
            oVis2.value = "true";
        }
    }
}

ASPX 标记代码段：**

             <span id="spTxtAnswer" class="required" visible="false" runat="server">*</span>
                        <asp:TextBox ID="txtAnswer" Text='<%# Bind("Answer") %>' runat="server" 
                                   TextMode="MultiLine" Height="76px" MaxLength="2000" Width="370px" Visible="false"  >
                        </asp:TextBox>
                        <asp:RequiredFieldValidator ID="valTextBox" ErrorMessage="This question is required." Enabled="false"
                        Display="Static" ControlToValidate="txtAnswer" runat="server" ValidationGroup="Request" />
                        <asp:RequiredFieldValidator ID="valAnswer" ControlToValidate="txtAnswer" ErrorMessage="<br />Other description is required."
                        Display="Static" enabled="false" runat="server"  ValidationGroup="Request" />
                        <span id="spDdlAnswer" class="required" visible="false" runat="server">*</span>
                        <asp:DropDownList ID="ddlAnswer" Visible="false" runat="server" />
                        <asp:RequiredFieldValidator ID="valDropDown" ControlToValidate="ddlAnswer" Enabled="false"
                        ErrorMessage="This field is required." Display="Static" runat="server"
                         InitialValue="(Select)"  ValidationGroup="Request" />
                        <asp:HiddenField ID="hfQuestionID" Value='<%# Bind("QuestionID") %>' runat="server" />
                        <asp:HiddenField ID="hfAnswer" Value='<%# Bind("Answer") %>' runat="server" />
                        <asp:HiddenField ID="hfRequired" Value='<%# Bind("Required") %>' runat="server" />
                        <asp:HiddenField ID="hfVisible" Value="false" runat="server" />

隐藏代码片段：

TextBox tb1 = (TextBox)gridUserSupplierTypeQuestionsAndAnswers.Rows[rowIndex + 1].FindControl("txtAnswer");
            TextBox tb2 = (TextBox)gridUserSupplierTypeQuestionsAndAnswers.Rows[rowIndex + 2].FindControl("txtAnswer");
            RequiredFieldValidator rfv1 = (RequiredFieldValidator)gridUserSupplierTypeQuestionsAndAnswers.Rows[rowIndex + 1].FindControl("valTextBox");
            RequiredFieldValidator rfv2 = (RequiredFieldValidator)gridUserSupplierTypeQuestionsAndAnswers.Rows[rowIndex + 2].FindControl("valTextBox");
            HiddenField hf1 = (HiddenField)gridUserSupplierTypeQuestionsAndAnswers.Rows[rowIndex + 1].FindControl("hfVisible");
            HiddenField hf2 = (HiddenField)gridUserSupplierTypeQuestionsAndAnswers.Rows[rowIndex + 2].FindControl("hfVisible");
            ddl.Attributes.Add("onchange", "handleDropDown(this,'" + tb1.ClientID + "','" + tb2.ClientID + "','" + questionID + "','" + rfv1.ClientID + "','" + rfv2.ClientID + "'," + 
                "'" + hf1.ClientID + "','" + hf2.ClientID + "');");
            //When selected and viewing in edit mode, set the visibility during page load
            string script = "<script language='javascript'>";
            script += System.Environment.NewLine + "var el = document.getElementById('" + ddl.ClientID + "');";
            script += System.Environment.NewLine + "handleDropDown(el,'" + tb1.ClientID + "','" + tb2.ClientID + "','" + questionID + "','" + rfv1.ClientID + "','" + rfv2.ClientID + "');</script>";
            ClientScript.RegisterStartupScript(Page.GetType(),"startScript", script);

**