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Wednesday, September 7, 2011

How to raise client side (javascript) or server side (code behind) messages in asp.net


Use below code to raise messages from javascript and code behind.

.ASPX

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="RaisingMessages.aspx.cs"
    Inherits="RaisingMessages" %>

<!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>Validation</title>

    <script type="text/javascript">

        function ValidatePage() {
            var fName = document.getElementById("txtFirstName");
            var lName = document.getElementById("txtLastName");

            if (fName.value == "") {
                //client side alert message
                alert('First Name should not be empty');
                return false;
            }          
            return true;
        }
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <table>
        <tr>
            <td>
                <asp:Label ID="lblFirstName" runat="server" Text="First Name"></asp:Label>
            </td>
            <td>
                <asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblLastName" runat="server" Text="Last Name"></asp:Label>
            </td>
            <td>
                <asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <asp:Button ID="btnSubmit" runat="server" Text="Submit"
                    OnClientClick="return ValidatePage();" onclick="btnSubmit_Click" />
            </td>
        </tr>      
    </table>
    </form>
</body>
</html>

.ASPX.CS


using System;
using System.Web.UI;

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

    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        if (string.IsNullOrEmpty(txtLastName.Text.Trim()))
        {           
            string script = "alert('Last Name should not be empty')";
            Type csType = GetType();
            // Server side alert message
            ScriptManager.RegisterStartupScript(Page, csType, "popuscript", script, true);
            return;
        }
    }
}

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