Trigger in Ajax

Question

How can we use trigger in Ajax Updating panel control?

Satyapriya Nayak · Answer

Hi Deepak, The tag has two childtags - the ContentTemplate and the Triggers tags. The ContentTemplate tag is required, since it holds the content of the panel. The content can be anything that you would normally put on your page, from literal text to web controls. The Triggers tag allows you to define certain triggers which will make the panel update it's content Ex:- @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " Default.aspx.cs " Inherits = " _Default " %> DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" > html xmlns ="http://www.w3.org/1999/xhtml" > head runat ="server" > title > UpdatePanel title > head > body > form id ="form1" runat ="server" > asp:ScriptManager ID ="ScriptManager1" runat ="server" /> asp:UpdatePanel runat ="server" id ="UpdatePanel" updatemode ="Conditional" > Triggers > asp:AsyncPostBackTrigger controlid ="UpdateButton2" eventname ="Click" /> Triggers > ContentTemplate > asp:Label runat ="server" id ="DateTimeLabel1" /> asp:Button runat ="server" id ="UpdateButton1" onclick ="UpdateButton_Click" text ="Update" /> ContentTemplate > asp:UpdatePanel > asp:UpdatePanel runat ="server" id ="UpdatePanel1" updatemode ="Conditional" > ContentTemplate > asp:Label runat ="server" id ="DateTimeLabel2" /> asp:Button runat ="server" id ="UpdateButton2" onclick ="UpdateButton_Click" text ="Update" /> ContentTemplate > asp:UpdatePanel > form > body > html > protected void UpdateButton_Click( object sender, EventArgs e) { DateTimeLabel1.Text = DateTime.Now.ToString(); DateTimeLabel2.Text = DateTime.Now.ToString(); } Thanks