Can i get value from javascript in C# code behind

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1.00/5 (1 vote)

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hello.. i'm junior in ASP.NET.

i want to ask,, if i create function with return value in a javascript(example return value of a string), can i get a value from code behind with C#?

please your advice and fewer or more samples.

Thank you..

Posted 20-Jul-11 17:38pm

Ade.Ruyani.Z

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5 solutions

Solution 6

code returns country code, but how to receive javascript values in Asp.net(C#) variable ?

i have taken a hidden field which control id is - hidcountry, but control id does not receive values.
please help me.

-------------------------------
step 1
using function

function setvalue()
{
debugger;
var hfValue = document.write(geoip_country_code());
alert(hfValue)
document.getElementById('hidcountry').value=hfValue.value;
return true;
}

--------------------------------------------

step 2

var hfValue = document.write(geoip_country_code());
alert(hfValue)
document.getElementById('hidcountry').value=hfValue.value;
return true;

Posted 24-Jan-14 12:22pm

VPJ

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CHill60 25-Jan-14 12:14pm

Posting a question as a solution to someone elses post will not get you much help. Use the "Ask a question" link to post your own question and use "pre" tags to format your code when you do so

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Tajuddin_HYD · Accepted Answer · 2011-07-20T20:13:00

Add this in ur design page:

XML

<asp:HiddenField ID="hdnResultValue" Value="0" runat="server" />
        <asp:Button ID="Button1" runat="server"  OnClientClick="returnString();"
            Text="Button" onclick="Button1_Click" />

script for this:

XML

<script language="javascript" type="text/javascript">
       function returnString() {
           debugger;
           document.getElementById("hdnResultValue").value = "Tajuddin";
       }
   </script>

Now get the value of hiddenfield in code behind wherever u want like below:

string codeBehindValue = hdnResultValue.Value;

Tajuddin_HYD · Accepted Answer · 2011-07-20T18:24:00

Solution 2

XML

Hi,
Here is the solution for your question , yeah u can get the value from code behind of js function,

see the following example:

javascript function which returns string

<script language="javascript" type="text/javascript">
function returnString() {
debugger;
var val = 'Name:Tajuddin';
return val;
}
</script>

C# Code to get the return value of the above function:

ClientScript.RegisterClientScriptBlock(this.GetType(), "alertScript", "<script language=javascript>var a=returnString();alert(a);</script>");

Posted 20-Jul-11 18:24pm

Tajuddin_HYD

Comments

shefeekcm 21-Jul-11 0:42am

what is the use of "debugger" here...?

Tajuddin_HYD 21-Jul-11 0:57am

Hi,by using debugger we can debugg script code line by line

Ade.Ruyani.Z 21-Jul-11 0:50am

thank you tajudin,, can i ask something??

what function "debugger;"? if i disable that script is not working?

second, how i can get value and put in variable from code behind?

example i want to put the value in string result = "..."

thank you for your help..

Tajuddin_HYD 21-Jul-11 0:56am

Hi, debugger used in javascript by using this we can debugg script line by line

Tajuddin_HYD 21-Jul-11 0:58am

Hi aruza here is no matter of debugger it is just used to debug the script code line by line thats it

Ade.Ruyani.Z 21-Jul-11 1:04am

oww... maybe I am wrong in carry out the code,, sorry for that.

oh ya tajudin,, can i get value and put in variable from code behind?

example i want to put the value in string result = "..."?

sorry if i ask many question? ^_^

Tajuddin_HYD 21-Jul-11 2:11am

Hi aruza sorry for delay....
i got what exactly u want to do,
Take one hidden field and assign the result in js function and get it in code behind page
i will post one more example code go through that

Bassem Yehia Salama 21-Jan-15 9:03am

can you plz submit the code to assign the value to code behind var

Member 8106781 23-Jul-11 10:36am

ok tajuddin,, it's ok.

thanks for your help code and explanation.

RaisKazi · Accepted Answer · 2011-07-20T18:18:00

Solution 1

Yes you can do this by using Ajax. Have a look at below link.

Simplifying Asp.Net Core Ajax[^]

Posted 20-Jul-11 18:18pm

RaisKazi

Comments

Ade.Ruyani.Z 21-Jul-11 0:52am

Thank you raiskazi..

this article help my comprehension,,

RaisKazi 21-Jul-11 4:39am

Perfect !

Muthu Nadar · Accepted Answer · 2011-07-21T00:21:00

Yes you can...

Check the below code

Designer

<<pre lang="xml">%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript">
        function setvalue()
        {
            debugger;
            var hfValue = document.getElementById('HiddenField1');
            hfValue.value = 'Hieeee...';
            return true;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:HiddenField ID="HiddenField1" runat="server" Value="Hie.." />
        <asp:Button ID="Button1" runat="server" Text="Show HiddenValue" OnClientClick="return setvalue();" OnClick="Button1_Click" />
        <asp:Label ID="Label1" runat="server"></asp:Label></div>
    </form>
</body>
</html>

Code behind

<pre lang="cs">using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = HiddenField1.Value;
    }
}

Can i get value from javascript in C# code behind

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