此次的Demo是一个页面,页面上有两行字,然后后面用AJAX,使用一个下拉框去替换第一行文字[/code]
第一个是被替换的网页
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<!DOCTYPE html>
< html >
< head >
< meta charset = "utf-8" />
< title ></ title >
< script type = "text/javascript" >
var xmlHttpRequest;
function createXmlHttpRequest() {
if (window.ActiveXObject) {
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");//IE浏览器
} else {
xmlHttpRequest = new window.XMLHttpRequest();//谷歌等浏览器
}
}
function sendRequest() {
createXmlHttpRequest();//获取对象
xmlHttpRequest.onreadystatechange = function () {
if (xmlHttpRequest.readyState == 4) {
if (xmlHttpRequest.status == 200) {
document.getElementById("divContent").innerHTML = xmlHttpRequest.responseText;
}
}
};
xmlHttpRequest.open("POST", "DeptHandler.ashx", true);
xmlHttpRequest.send(null);
}
</ script >
<!--<script type="text/javascript">
var xmlHttpRequest;
function createXMLHttpRequest() {
if (window.ActiveXObject) {
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");//IE浏览器
} else {
xmlHttpRequest = new window.XMLHttpRequest();//谷歌等浏览器
}
}
//请求数据
function sendRequest() {
createXMLHttpRequest();
xmlHttpRequest.onreadystatechange = function () {
if (xmlHttpRequest.readState == 4) {
if (xmlHttpRequest.status == 200) {
document.getElementById("divContent").innerHTML = xmlHttpRequest.responseText;
}
}
}
xmlHttpRequest.open("POST", "DeptHandler.ashx", true);
xmlHttpRequest.send(null);
}
</script>-->
</ head >
< body >
< div >
< div id = "divContent" >
< p style = "color:red" >这里显示部门信息</ p >
</ div >
< script type = "text/javascript" >sendRequest()</ script >
< div >
< p style = "color:red" >这里显示部门信息结束了</ p >
</ div >
</ div >
</ body >
</ html >
|
第二个是一个类
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WebApplication2
{
public class Dept
{
public int Id { get ; set ; }
public string DeptName { get ; set ; }
}
}
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然后是一个一般处理程序
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Web;
namespace WebApplication2
{
/// <summary>
/// DeptHandler 的摘要说明
/// </summary>
public class DeptHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
//这里的AJAX进行了三秒的延迟
Thread.Sleep(3000);
List<Dept> depts = new List<Dept>
{
new Dept(){Id=1,DeptName= "财务部" },
new Dept(){Id=2,DeptName= "研发部" },
new Dept(){Id=3,DeptName= "市场部" }
};
StringBuilder sb = new StringBuilder();
sb.AppendLine( "<select>" );
foreach (var item in depts)
{
sb.AppendLine($ "<option id = {item.Id}>{item.DeptName}</option>" );
}
sb.AppendLine( "</select>" );
context.Response.ContentType = "text/plain" ;
context.Response.Write(sb);
}
public bool IsReusable
{
get
{
return false ;
}
}
}
}
|
效果图
AJAX有三秒的延迟加载
前三秒
后三秒
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原文链接:https://blog.csdn.net/a1439775520/article/details/105867099