How to retrieve server side variables using JavaScript code

<asp:HiddenField ID="HiddenField1" runat="server" />    

public partial class LoginDemo : System.Web.UI.Page
{   
    private string str="hello";
    protected void Page_Load(object sender, EventArgs e)
    {
        HiddenField1.Value=str;
    }
}

Then you can access the control HiddenField1 using javascipt:

<script type="text/JavaScript">
Var tt=document.getElementByID(“HiddenField1”);
alert(tt.value);
</script>

  

Related posts:

http://forums.asp.net/p/1000655/1319119.aspx

Posted in: FAQ in Web Forms,Java Script