How to access hidden Field Value present inside update panel using javascript ?

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Hi Experts,

I have a hidden field like this

ASP.NET

<div class="col-xs-12 pull-right" style="text-align: right;">
                                       <asp:UpdatePanel ID="udpAjaxTimer" runat="server">
                                           <ContentTemplate>
                                               <asp:Label ID="Label1" runat="server" Text="TimeLeft:" Font-Size="10pt"></asp:Label>
                                               <asp:Label ID="Label2" runat="server" Text="" Font-Bold="true" Font-Size="10pt"></asp:Label>
                                                <asp:HiddenField ID="hdnUsedTime" runat="server" />
                                           </ContentTemplate>
                                           <Triggers>
                                               <asp:AsyncPostBackTrigger ControlID="Timer1" />
                                           </Triggers>
                                       </asp:UpdatePanel>
                                       <asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="Timer1_Tick">
                                       </asp:Timer>
                                   </div>

Now i want to access the value of that hidden field using java script
can any one please tell me how to solve this?

thanks in advance
(Keerthi Kumar)

Posted 28-Apr-15 20:44pm

Keerthi Kumar(Andar)

Updated 28-Apr-15 20:59pm

KaushalJB

v3

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KaushalJB 29-Apr-15 3:01am

How are you assigning value to hdnUsedTime ? and after accessing the value what operation you need to perform ?

Keerthi Kumar(Andar) 29-Apr-15 3:04am

am assigning the value through c# code behind. after accessing that i want to pass that value to ajax method call
var hdnValue = $("input[id$='hdnUsedTime']").val();
this is giving Undefined

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Kornfeld Eliyahu Peter · Answer 1 · 2015-04-28T21:15:00

As long as you can uniquely identify an element - you can access it (the fact that it is a hidden field is irrelevant, as it is only for the visual part is hidden, but still there in the DOM)...
ASP.NET HiddenField renders to a HTML element of input with type set to hidden...The only problem is that the id can be extended by the ASP.NET rendering engine...Learn about it here[^]...

Now the way to get the generated id from client side code is using inline server tags...

Plain JS

JavaScript

var el = document.getElementById('<%= hdnUsedTime.ClientID %>');

JQuery