前端之家收集整理的这篇文章主要介绍了
Ajax从某个页面读取数据，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
在某个页面中存储下面的一些json数据：@H_403_1@
{
"programmers": [
{ "firstName": "Brett","lastName":"McLaughlin","email": "brett@newInstance.com" },{ "firstName": "Jason","lastName":"Hunter","email": "jason@servlets.com" },{ "firstName": "Elliotte","lastName":"Harold","email": "elharo@macfaq.com" }
],"authors": [
{ "firstName": "Isaac","lastName": "Asimov","genre": "science fiction" },{ "firstName": "Tad","lastName": "Williams","genre": "fantasy" },{ "firstName": "Frank","lastName": "Peretti","genre": "christian fiction" }
],"musicians": [
{ "firstName": "Eric","lastName": "Clapton","instrument": "guitar" },{ "firstName": "Sergei","lastName": "Rachmaninoff","instrument": "piano" }
]
}
@H_
403_1@ 利用原生Ajax发送请求
获取上个
页面中的数据，并写入本
页面中：
@H_
403_1@
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<head>
<Meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>People at Clearleft</title>
<script type="text/javascript">
var httpRequest;
//创建异步请求
function creatXMLHttpRequest(){
if(window.XMLHttpRequest){
httpRequest= new XMLHttpRequest();
}
else{
if(window.ActiveXObject){
try{
httpRequest = new ActiveXObject("Msxm12.XMLHTTP");
}catch(e){
try {
httpRequest= new ActiveXObject("Microsoft.XMLHTTP");
}catch(e){}
}
}
}
}
//ajax 回调函数
function callback(){
if (httpRequest.readyState==4){
if(httpRequest.status==200){
/*主要操作*/
var xmldata=httpRequest.responseText;
/*将数据转为json格式*/
var json = eval("("+xmldata+")");
/*给页面中的文本框内容赋值*/
document.getElementById("i").value=json.programmers[0].firstName;
//document.getElementById("str").innerHTML=json;
//document.getElementById("str").innerHTML=xmldata;
}
}
}
function getdata(){
creatXMLHttpRequest();
httpRequest.onreadystatechange=callback;
httpRequest.open("GET","json.txt",true);
httpRequest.send(null);
}
</script>
</head>
<body>
<div id="str" style="display:none"></div>
<input id="i" type="text" value="">
<input type="button" value="find data" onclick="getdata()"/>
</body>
</html>
