ajax 載入小案例
阿新 • • 發佈:2018-12-31
<%@ page language="java" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript" src="./load.js"></script>
</head>
<body>
<form action="" enctype="application/x-www-form-urlencoded" >
<div id="divcheck"></div>
<input type="button" name="ok" id="ok" value="測試載入">
</form>
</body>
</html>
function ajaxFunction(){
var xmlHttp;
try{ // Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e){
try{// Internet Explorer
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){}
}
}
return xmlHttp;
}
//當頁面載入完畢之後,執行以下程式碼
window.onload = function (){
document.getElementById("ok").onclick = function(){
var xhr = ajaxFunction();
xhr.onreadystatechange = function(){
if(xhr.readyState==1){
document.getElementById("divcheck").innerHTML = "<img src='loading33.gif'></img> 正在連線";
document.getElementById("divcheck").innerHTML = "<img src='loading33.gif'></img> 正在連線";
alert("xxx");
}else if(xhr.readyState==2){
document.getElementById("divcheck").innerHTML = "<img src='loading33.gif'></img> 正在載入";
alert("xxx");
}else if(xhr.readyState==3){
document.getElementById("divcheck").innerHTML = "<img src='loading33.gif'></img> 正在處理";
alert("xxx");
}else if(xhr.readyState==4){
document.getElementById("divcheck").innerHTML = "顯示視訊頁面";
}else{
document.getElementById("divcheck").innerHTML = "視訊頁面載入失敗";
}
}
xhr.open("POST","../LoadServlet?timeStamp="+new Date().getTime(),true);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.send(null);
}
}
package com.cc.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoadServlet extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
}
}