Asp.net Not geting value from javascript function in c# variable

Question

this problem has wasted much of my time. I have written a javascript function and assigned value to asp hidden field but when i run my application i am not getting the value in c# variable please correct me if i am missing something. thanks in advance. here is my code javascript function:

function sureDelete() {
            if (confirm("DELETE USER?") == true) {              
                document.getElementById("hidden_yesno").setAttribute("Value", "1");
              //document.getElementById('deleteYesNo').value = 1;
            } else {                         
                document.getElementById("hidden_yesno").setAttribute("Value", "0");
               //document.getElementById('deleteYesNo').value = 0;
            }
            return true;
        }

my hidden field and click event

<asp:HiddenField ID="hidden_yesno" runat="server" />
<asp:ImageButton  runat="server" CssClass="pt-userDeactive help" CommandName="deleteuser"
CommandArgument='<%# Eval("user_id") %>' ImageUrl ="../TemplateS/assets/images/delete.png"
Width="25px" Height="25px" OnClick="Unnamed_Click" OnClientClick="return sureDelete()"/>

and following is the c# code

 protected void Unnamed_Click(object sender, ImageClickEventArgs e) {
            string flag = hidden_yesno.Value.ToString();
              //here i am getting the value as: ""            
            if (flag == "1") {
               //do something
            } else {
                //do nothing
            }          
        }

Mairaj Ahmad · Accepted Answer · 2016-12-16 10:02:57Z

5

You are using asp:HiddenFeild whose ID is changed by asp.net according to ContentPlaceHolder so it is not found by javascript/jquery.

Either you need exact ID of hidden feild or you can set ClientIDMode="static" which will make sure that ID is not changed.

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

answered Dec 16, 2016 at 10:02

Mairaj Ahmad

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