如何从 asp.net 中的 java 脚本代码（客户端）访问隐藏字段值 c#

Question

I have defined hidden field in.aspx page(ui)

 <asp:HiddenField ID ="hdnExport" runat="server" />

Set the value in the following code (java script)

$(document).ready(function () {
            $("#btn_FinalConfirmOK").on("click", function (event) {
                alert("clicked");
                //document.getElementById("hdnExport").value = "yes";
                $('#hdnExport').val("yes");
               
                alert($('#hdnExport').val());

                document.getElementById('hdnExport').value = "yes";
                //alert("yes");
            });
        });

Then accessing hidden field value in aspx.cs code is given below,

string exportValue = Convert.ToString(hdnExport.Value);
        string exp = hdnExport.Value.ToString();
        var val = this.hdnExport.Value;
        string latitudeValue = Request.Form[hdnExport.Value];

Tried with different ways. but i didn't get value from hidden field. how to solve this issue

Answer 1

By default, the rendered id will differ from the ID specified within C# ( hdnExport ). Therefore, ( #hdnExport ) is likely an invalid selector thus no value is set.

Try setting ClientIDMode="Static" on the HiddenField :

 <asp:HiddenField ID ="hdnExport" ClientIDMode="Static" runat="server" />

This will ensure the hidden field is rendered with id as ID which would make #hdnExport valid.