Sunday, January 12, 2014

How to avoid multiple button clicks while post back in ASP.NET

Many time we face the issue how to prevent user from clicking the same button before completing the post back.

A simple java script can be added for this. this will change the text of button and verify. A Dot Net 2.0 example given below

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="DropDownlist_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head id="Head1" runat="server">
    <form id="Form1" runat="server">
        <asp:Button ID="btnAction" runat="server" 
var res=this.value=='Processing...'?false:true;
 return res;
 Text="Do Action" Width="125px" />

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;
public partial class DropDownlist_Default : System.Web.UI.Page
    protected void ActionEvent(object sender, CommandEventArgs e)

The text of button is changed to 'Processing...' so that the user even knoWS something is going on and even if he clicks it will not post back as our client script returns false if the caption is 'Processing...'.


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