Introduction
I will explain How to use JavaScript by GetCallbackEventReference in asp.net.
Description
Examples of use Callback random numeric value that will set one up. When a user clicks a button on the program will send the form values from the random to show in the TextBox.
Example:
C#
I will explain How to use JavaScript by GetCallbackEventReference in asp.net.
Description
Examples of use Callback random numeric value that will set one up. When a user clicks a button on the program will send the form values from the random to show in the TextBox.
Example:
<%@ page language="C#" autoeventwireup="true" codefile="How-to-use-GetCallbackEventReference-c.aspx.cs"
inherits="How_to_use_Callback_c" %>
<!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>How to use GetCallbackEventReference</title>
<script type="text/javascript">
function GetNumber() {
UseCallback();
}
function GetRandomNumberFromServer(txtGetNumber, context) {
document.forms[0].txtGetNumber.value = txtGetNumber
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="Button1" type="button" value="Get Random Number" onclick="GetNumber()" />
<br />
<br />
<asp:textbox id="txtGetNumber" runat="server"></asp:textbox>
</div>
</form>
</body>
</html>
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C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
public partial class How_to_use_Callback_c : System.Web.UI.Page, System.Web.UI.ICallbackEventHandler
{
private string CallbackResult = null;
protected void Page_Load(object sender, EventArgs e)
{
string cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "GetRandomNumberFromServer", "context");
string cbScript = "function UseCallback(arg, context)" + "{" + cbReference + ";" + "}";
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "UseCallback", cbScript, true);
}
public void RaiseCallbackEvent(string eventArgument)
{
Random rnd = new Random();
CallbackResult = rnd.Next().ToString();
}
public string GetCallbackResult()
{
return CallbackResult;
}
}
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