Get the Value of an asp:HiddenField using jQuery

Question

I have two pages. From the first page, I open a modal with a querystring that holds that value of a client name. I then use this to set a hiddenfield on the modal that opene

Answer 1

You forgot the # in your selector to select by ID:

var hv = $('#hidClientField').val();

Although asp.net generates ID based on the naming containers so you might end up with an ID like ctl1$hidClientField. You can then use the "attribute ends with" selector:

var hv = $('input[id$=hidClientField]').val();

Check the documentation about jQuery selectors

Answer 2

you can do in this way

var hval = $('#<%= hdMarkupPercentage.ClientID%>').val();

Answer 3

Use ID selector.

var hv = $('#hidClientName').val();

Or

var hv = $('#<%=hidClientName.ClientID%>').val();

Answer 4

Include ClientIDMode="Static" in your code.

var obj = $('#hidClientName').val(); <asp:HiddenField ID="hidClientName" ClientIDMode="Static" runat="server" />

Or

var obj = $('#<%=hidClientName.ClientID%>').val(); <asp:HiddenField ID="hidClientName" runat="server" />

Answer 5

Because jQuery knows nothing about asp:HiddenField. It looks in the HTML structure where you have <input type="hidden" name="ctl00$cph_main$HiddenFieldServerDateTime" id="ctl00_cph_main_HiddenFieldServerDateTime" .... So there's no input with ID= HiddenFieldServerDateTime. There are a few ways to overcome this:

• Use a css selector:

  <asp:HiddenField ID="HiddenFieldServerDateTime" 
                   runat="server" 
                   CssClass="SomeStyle" />
  

  with the following selector: var serverDateTime = $(".SomeStyle").val();

  CssClass is not an available class on the HiddenField class (and it doesn't have an Attributes collection, so you can't add it manually).

• Use ClientID property:

  var serverDateTime = $("#<%= HiddenFieldServerDateTime.ClientID %>").val();
  

• Wrap the hidden field in something you can select:

  <div class="date-time-wrap">
    <asp:HiddenField ID="..." runat="server" />
  </div>
  

   

  var serverDateTime = $('.date-time-wrap input[type=hidden]').val();
  

Answer 6

Try any of the following

1. If ASP.Net control and javascript both are on same page, then use

   var hv = $("#"+ '<%= hidClientField.ClientID %>').val();
   

2. If you want to access the control from some JS file, then

   // 'id$' will cause jQuery to search control whose ID ends with 'hidClientField'
   var hv = $('input[id$=hidClientField]').val();
   

3. You can use class name selector to achieve same. Check out this similar question.

In asp.net, controls id is mangled. Because of this your code is not working.

Hope this works for you.