简单callback实现注解

最新推荐文章于 2024-12-05 15:35:07 发布

原创最新推荐文章于 2024-12-05 15:35:07 发布 · 1k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#callback #textbox #javascript #string #function #server

本文介绍了一个ASP.NET页面中实现客户端与服务器间回调事件的例子。通过注册JavaScript函数与按钮点击事件相结合，实现了数据从客户端到服务器的传递，并返回处理后的结果到客户端进行显示。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default24.aspx.cs" Inherits="Default24" %>
<!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 id="Head1" runat="server">
    <title>无标题页</title>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <input id="mybutton" type="button" value="button" runat="server"/></div>
    </form>
</body>
</html>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
public partial class Default24 : System.Web.UI.Page, System.Web.UI.ICallbackEventHandler
{
    string strCallback;

    protected void Page_Load(object sender, EventArgs e)
    {
        ClientScriptManager cm = Page.ClientScript;
        string callserverjs = "function ReceiveServerData(arg, context){document.getElementById('TextBox1').value = '# ' + arg + ' @ ' + context;}";
        //regist javascript function.This function is used to change data between client and server by argument.
        cm.RegisterClientScriptBlock(this.GetType(), "CallServer", callserverjs,true);
        //Add callback event reference to the javascript function.
        //GetCallbackEventReference(control,the argument passed from client to server,javascript function,initial value passed to the client)
        string cbReference=cm.GetCallbackEventReference(this, "'myargument'", "ReceiveServerData", "'mycontext'");

        mybutton.Attributes["onclick"] = cbReference;


    }

    public void RaiseCallbackEvent(String eventArgument)
    {
        //pass the argument from client to server
        strCallback = eventArgument;
    }

    public string GetCallbackResult()
    {
        //return the value to client argument.You can do service function here and return value to the client argument.
        return strCallback + " " + DateTime.Now.ToString("hh:mm:ss");
    }
}