使用回调技术实现局部刷新
使用回调技术实现局部刷新,它只要是实现了ICallbackEventHandler这个接口,使用接口中的RaiseCallbackEvent
事件和GetCallbackResult()方法,最后用javaScript脚本来调用
以下是前台Default.aspx.cs代码:
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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/// <summary>
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/// 功能:利用ICallbackEventHandler回调事件接口实现一个局部
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/// 刷新
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///
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/// 时间:二00八年二月二十日
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///
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/// 作者:曹代明
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/// </summary>
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public partial class February_AJAX_Default : System.Web.UI.Page,ICallbackEventHandler
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{
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private string _data;
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protected void Page_Load(object sender, EventArgs e)
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{
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}
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ICallbackEventHandler 成员
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}
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以下是后台Default.aspx代码:
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="February_AJAX_Default" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>无标题页</title>
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<script type="text/javascript">
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function FillData()
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{
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var city=document.getElementById("TextBox1").value;
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<% =this.ClientScript.GetCallbackEventReference(this,"city","FillDll",null) %>;
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}
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function FillDll(strcity)
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{
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document.getElementById("DropDownList1").options.length=0;
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var indexofcity;
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var city;
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//切割传递来的字符串
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while(strcity.length>0)
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{
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//判断是否是最后一个字符串
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indexofcity=strcity.indexOf(",");
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if(indexofcity >0)
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{
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city=strcity.substring(0,indexofcity);
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strcity=strcity.substring(indexofcity+1);
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//填充下拉框
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document.getElementById("DropDownList1").add(new Option(city,city));
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}
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else
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{
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// 如果是最后一个字符串
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document.getElementById("DropDownList1").add(new Option(strcity,strcity));
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break;
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}
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};
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}
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</script>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<table style="width: 504px; height: 151px">
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<tr>
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<td colspan="2" style="font-weight: bold; color: #3300ff; text-align: center">
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使用回调技术实现局部刷新</td>
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</tr>
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<tr>
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<td style="width: 135px">
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输入城市名称</td>
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<td style="width: 3px">
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<asp:TextBox ID="TextBox1" runat="server" Width="233px"></asp:TextBox></td>
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</tr>
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<tr>
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<td style="width: 135px">
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</td>
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<td style="width: 3px">
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<input id="Button1" style="width: 131px" type="button" value="查询" onclick="FillData()"/></td>
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</tr>
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<tr>
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<td style="width: 135px">
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选择区域列表</td>
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<td style="width: 3px">
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<asp:DropDownList ID="DropDownList1" runat="server" Width="237px">
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</asp:DropDownList></td>
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</tr>
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</table>
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</div>
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</form>
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</body>
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</html>
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