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Ajax to achieve page timing refresh without brushing the screen

Source: Internet
Author: User
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The main page (page requiring refresh) requires the system time to be refreshed every minute

<body onload="makeRequest("getSystemTime.jsp")"> //创建httpRequest对象
<form name="dateForm">
<table>
<td colspan="2" align="center">
　　　　 <div id="sysTimeShow"></div> //显示平台系统时间
　　　　</td>
</table></form>
</body>
getSystemTime.jsp　　 //获得系统的当前时间，也就是输出结果的页面
<%@ page language="java"　%>
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.util.Date"%>
<%@ page import="java.sql.Timestamp"%>
<%@ page import="java.io.IOException"%>
<%
Date d = new Date();
Timestamp ts = new Timestamp(d.getTime());
String result = ts.toString().substring(0,16);
out.write(result,0,result.length());
%>

Ajax.js

function makerequest (URL) {
Http_request = false;
if (window. XMLHttpRequest) {
Http_request = new XMLHttpRequest ();
if (Http_request.overridemimetype) {
Http_request.overridemimetype (' Text/xml ');
}
else if (window. ActiveXObject) {
try{
Http_request = new ActiveXObject ("Msxml2.xmlhttp");
catch (e) {
try {
Http_request = new ActiveXObject ("Microsoft.XMLHTTP");
catch (e) {
}
}
}
if (!http_request) {
Alert ("Your browser does not support the current operation, please use IE 5.0 version!");
return false;
}
The method that defines the page invocation init, not init ();
Http_request.onreadystatechange = init;
Http_request.open (' Get ', url, true);
Prohibit IE caching
Http_request.setrequestheader ("If-modified-since", "0");
Send data
Http_request.send (NULL);
Refresh page every 60 seconds
settimeout ("MakeRequest" (' +url+ ")", 60000);
}
function init () {
if (http_request.readystate = = 4) {
if (http_request.status = 0 | | http_request.status = = 200) {
var result = Http_request.responsetext;
if (result== "") {
result = "System time acquisition Failure";
}
document.getElementById ("Systimeshow"). Innerhtml= "Platform system time:" +result;
else {//http_request.status!= 200
Alert ("Request failed!");
}
}
}

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Related Keywords:
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