to get javactript variable value in code behind

[Kasi Viswanathan]

Try this if(Request.querystring["Value"]!=null) { Idval=Request.querystring["Value"]; label1.Text=Idval; }

[Sandeep Akhare]

What if he wants the value in same page when postback occurs ?

Thanks and Regards Sandeep If If you look at what you do not have in life, you don't have anything, If you look at what you have in life, you have everything... "

[P_Elza]

This is the function in javascript function display() { var localpath1 = document.getElementById('lblerr'); lblerr.innerText = localpath; } it is diplaying the value on label. lblerr is the id of label. am calling this function on pageload but when i try to get the value using lblerr.text, it is showing null. y is it so? how to get value on the label

[P_Elza]

I tryed this but

Kasi Viswanathan wrote:

Request.querystring

is showing error. I couldent rectify this. th error is 'System.Web.HttpRequest' does not contain a definition for 'querystring'

[Sandeep Akhare]

i think this value that you are initialzing in javascript won't persist. Do one thing Add hidden variable runat server and assign value to that hidden varaible and use that hidden varaible at server side like this var label1=document.getElementById('hidden'); label1.value="Sandeep"; and at the server side just get the value from it hidden.Value that will return you string

Thanks and Regards Sandeep If If you look at what you do not have in life, you don't have anything, If you look at what you have in life, you have everything... "

[P_Elza]

i had tried this one also previously. error was occuring the error is

System.NullReferenceException:Object reference not set to an instance of an object

what is this? how to rectify this. am new to .net. thats y am asking all these questions. please dont feel bad.

[Sandeep Akhare]

It means that you are using the object whose instance is not creaetd yet It will also give the line number. check the line number Which version of ASP.nET are you using ? Please pest the code

Thanks and Regards Sandeep If If you look at what you do not have in life, you don't have anything, If you look at what you have in life, you have everything... "

[P_Elza]

on line number i have writen string val=txtHidden.Value.ToString(); eat is wrong in this? while debuging it is showing the value of txthiden as

txtHidden: : System.Web.UI.HtmlControls.HtmlInputHidden

am using .net 2003

[Sandeep Akhare]

OK don't add ToString(); just add string val=txtHidden.Value; And be sure that txtHidden is decalared in your application such as System.Web.UI.HtmlControls.HtmlInputHidden txtHidden;

Thanks and Regards Sandeep If If you look at what you do not have in life, you don't have anything, If you look at what you have in life, you have everything... "

[Christian Graus]

P_Elza wrote:

document.getElementById('lblerr');

If this works, odds are that lblerr is not a server control. A server control invariably has a longer client side Id than it's server side one.

Christian Graus - Microsoft MVP - C++ "also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

[P_Elza]

that all thing i have written and i have tried this as string val=txtHidden.Value; also befor. it ididnt work that time so i added it to string(); i dont know wat is wrong in my code and y it is not working. why it is taking txtHiddenas "undefined"? i have defined it previously na?

[Sandeep Akhare]

Check the id of the hidden control in aspx page and aspx.cs both should be identical. Could you post your whole page ?

Thanks and Regards Sandeep If If you look at what you do not have in life, you don't have anything, If you look at what you have in life, you have everything... "

[P_Elza]

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Text;
using System.IO;
using System.Data.SqlClient;

namespace Web
{
	
	public class _3B2Temp : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button btnclick;
		protected System.Web.UI.WebControls.Label lblmsg;
		protected System.Web.UI.WebControls.Label lblerr;
		protected System.Web.UI.HtmlControls.HtmlInputHidden txtHidden;
		
	
		private void Page_Load(object sender, System.EventArgs e)
		{	
			
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// 
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// 
		private void InitializeComponent()
		{    
			this.btnclick.Click += new System.EventHandler(this.btnclick_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void btnclick_Click(object sender, System.EventArgs e)
		{
			

				string val=txtHidden.Value;
		}
	}
}

hope this is enough

[P_Elza]

I tried this in private void Page_Load(object sender, System.EventArgs e) {} also.... please dont stop replaing in between.

[Sandeep Akhare]

Please be sure that txtHidden value is assigned in aspx Code looks right check my code this is javascript function function HideContent() { var hiddenVar=document.getElementById('hidden'); hiddenVar.value="Sandeep"; } And here is the .cs file code protected void Page_Load(object sender, EventArgs e) { Button1.Attributes.Add("onclick", "javascript:HideContent();"); } protected void Button1_Click(object sender, EventArgs e) { if (!String.IsNullOrEmpty(hidden.Value)) { TextBox1.Text = hidden.Value; } } It is working boss in my machine

Thanks and Regards Sandeep If If you look at what you do not have in life, you don't have anything, If you look at what you have in life, you have everything... "

[P_Elza]

Christian Graus wrote:

odds are that lblerr is not a server control

I didnt understand what u mean. I said this code is not working. and showing error

[P_Elza]

thank u boss its working now thanks a lot:):rose:

[Samariya prakash]

It may be get by two way 1. Make hidden field and assign your javascript values to that field using javascript. AND then used that hidden field in code behind. 2. Use cookies to get/set values from javascript and codebehind. B'cz as you may know cookies can be operate by javascript and codebehind both side. Prakash Samariya