Assigning C# variable value using javascript variable in code behind

Question

I am trying to access the script variable pic and assign it to another variable in C#, say hidden field hdn. The script below is also placed on the same code behind page for some reason. I can directly access the hidden field here. But how do I assign it value from the script variable?

 <script type=\"text/javascript\">
   $(document).ready(function() {
     $.get('<%=completeURL%>', 
     function(d) {
       $(d).find('entry').each(function(){
         var $entry = $(this);
         var pic = $entry.find('content').attr('src');
         alert(pic);
       });
     });
   });
 </script>

MichaC · Accepted Answer · 2013-09-24 09:34:49Z

1

There is no way to assign a C# variable by javascript. You have to send that value from the client (where you JavaScript is running) to the Server, and assign it. This is so called ajax request, just google it and you'll find millions of good examples of how to achieve that.

answered Sep 24, 2013 at 9:34

MichaC

13.7k2 gold badges49 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

user2408588 · Accepted Answer · 2013-09-24 09:37:57Z

1

create a hidden filed and then set the value from javascript

 <asp:hiddenfield id="hf_MyValue"
          value="whatever" 
          runat="server"/>

How To Set value in javascript

//get value from hidden filed
var test= document.getElementById('<%= hf_MyValue.ClientID %>');
//set value in hidden filed
document.getElementById('<%= hfBrand.ClientID %>').value = "True";

answered Sep 24, 2013 at 9:37

user2408588

2 Comments

ankita alung Over a year ago

This is what I need help for. I've already created one such field but the question is how to assign it the value from script now?

Moo-Juice Over a year ago

@ankitaalung, $('#yourcontrolId').val(pic);

Alvin Jones · Accepted Answer · 2013-09-24 09:42:09Z

0

Create a hidden variable like this,

<input type="hidden" id="hdnVariable" runat="server" />

Now try this code

<script type=\"text/javascript\">
   $(document).ready(function() {
     $.get('<%=completeURL%>', 
     function(d) {
       $(d).find('entry').each(function(){
         var $entry = $(this);
         var pic = $entry.find('content').attr('src');
         //assign value to server side hidden variable
         $("#<%=hdnVariable.ClientID%>").val(pic);
       });
     });
   });
 </script>

Now you can access this hidden field from C# code like this

string pic=hdnVariable.Value;

answered Sep 24, 2013 at 9:42

Alvin Jones

112 bronze badges

3 Comments

ankita alung Over a year ago

Makes sense to me, let me try it first.

ankita alung Over a year ago

it's still giving me empty string after debugging it.

Alvin Jones Over a year ago

in what event are you trying to get this value, can you post the full code you are using ?, both cs and asp.net if possible

Collectives™ on Stack Overflow

Assigning C# variable value using javascript variable in code behind

3 Answers 3

Comments

2 Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

2 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related