How to set asp.net hidden field in JavaScript and access the value in C# code behind - Stack Overflow

I'm trying to set hidden field value in JS which I think works fine with this approach:

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

   var latSW = bounds.getSouthWest().lat();
   $('#<%=hfLatSW.ClientID %>').value = latSW;

I am trying to access the value on asp button click in code behind gives me null value. What might be happening in the postback and why am I not able to access the value set by JavaScript?

I'm trying to set hidden field value in JS which I think works fine with this approach:

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

   var latSW = bounds.getSouthWest().lat();
   $('#<%=hfLatSW.ClientID %>').value = latSW;

I am trying to access the value on asp button click in code behind gives me null value. What might be happening in the postback and why am I not able to access the value set by JavaScript?

• c#
• javascript
• jquery
• html
• asp

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1 Answer 1

Sorted by: Reset to default 3

.value isn't a jQuery property. Use .val():

$('#<%=hfLatSW.ClientID %>').val(latSW);

Or without jQuery:

document.getElementById('<%=hfLatSW.ClientID %>').value = latSW;