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Making server side decision based on client side JavaScript

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14 Jan 2014CPOL 13.2K   9   4
Many of you might have come across the situation where you need to making server side discussion based on client side JavaScript confirm message

This articles was originally at wiki.asp.net but has now been given a new home on CodeProject. Editing rights for this article has been set at Bronze or above, so please go in and edit and update this article to keep it fresh and relevant.

Many of you might have come across the situation where you need to making server side discussion based on client side JavaScript confirm message value. Though this may sound very basic feature, surprisingly large developers struggle when implementing this. In this article, I will show you how to.
ASP
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="Server">

  <table style="margin-top:100px;">
    <tr style="padding-bottom:10px">
      <td>
        <asp:Label ID="lblitemName" Text="Item Value" runat="server">
        </asp:Label>
      </td>
      <td>
        <asp:TextBox ID="txtitemval" runat="server"> </asp:TextBox>
      </td>
    </tr>
  </table>

  <div style="padding-bottom:10px">
    <asp:Label ID="lblMsg" runat="server"></asp:Label>
  </div>

  <div style=" margin-bottom:100px; margin-left:120px">
    <asp:HiddenField ID="hdnField" runat="server" Value="false" />
    <asp:Button ID="btnSubmit" runat="server" Text="Check Val" OnClick="btnSubmits_Click" />
  </div>

</asp:Content>

And the code behind for this page is like

C#
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;
using System.Data.SqlClient;

public partial class Test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnSubmits_Click(object sender, EventArgs e)
    {
        string itemValue = Convert.ToString(txtitemval.Text);
        if (hdnField.Value == "false")
        {
            lblMsg.Visible = false;
            AddJavascriptCode(itemValue);
        }
        else if (hdnField.Value == "true")
        {
            lblMsg.Visible = true;
            lblMsg.Text = string.Format("You have entered {0}", itemValue);
            hdnField.Value = "false";
        }
    }

    private void AddJavascriptCode(string itemValue)
    {
        string script = @"< script language=""JavaScript"" type=""text/javascript"">
window.onload=function()
{
var IsConfirm = 1;
objField = document.getElementById('" + hdnField.ClientID + @"');
objSubmit = document.getElementById('" + btnSubmit.ClientID + @"');
IsConfirm = newConfirm('Test','You have entered " + itemValue + @" value. Are you sure you want to go next page?',1,1,0);
if(IsConfirm == true)
{
objField.value = 'true';
objSubmit.click();
}
else
{
objField.value = 'false';
}
}
function newConfirm(title,mess,icon,defbut,mods)
{
if (document.all)
{
retVal = confirm(mess);
retVal = (retVal==1)
}
else
{
retVal = confirm(mess);
}
return retVal;
}
</script>";
        Page.ClientScript.RegisterStartupScript(this.GetType(), "Test", script);
    }
}

See the Result below

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
United States United States
The ASP.NET Wiki was started by Scott Hanselman in February of 2008. The idea is that folks spend a lot of time trolling the blogs, googlinglive-searching for answers to common "How To" questions. There's piles of fantastic community-created and MSFT-created content out there, but if it's not found by a search engine and the right combination of keywords, it's often lost.

The ASP.NET Wiki articles moved to CodeProject in October 2013 and will live on, loved, protected and updated by the community.
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Comments and Discussions

 
GeneralBad Code! Pin
Nitij1-May-14 21:40
professionalNitij1-May-14 21:40 
GeneralMy vote of 3 Pin
BH TAN15-Jan-14 22:12
professionalBH TAN15-Jan-14 22:12 
GeneralMy vote of 1 Pin
Adam R Harris14-Jan-14 7:31
Adam R Harris14-Jan-14 7:31 
QuestionYUCK! Pin
Adam R Harris14-Jan-14 7:30
Adam R Harris14-Jan-14 7:30 

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