我正在为 JavaScript 编写代码。在其中我正在尝试使用 AJAX 检查远程 asp.net 页面(aspx)连接。但我还想检查这个调用将只持续 2 分钟和 10 秒时间的条件间隔。不是那样,而是像我在想的那个逻辑, If flag=true if seconds < 120 setInterval("GetFeed()", 2000);
任何人都可以请帮助我。
这是我的连接检查代码,
var learnerUniqueID1;
var flag='true';
function fnCheckConnectivity(coursId)
{
//here will the remote page url
var url = 'http://<%=System.Web.HttpContext.Current.Request.UrlReferrer.Host+System.Web.HttpContext.Current.Request.ApplicationPath%>/TestConn.aspx';
//alert(url);
if (window.XMLHttpRequest) {
learnerUniqueID1 = new XMLHttpRequest();
}
else if (window.ActiveXObject) {
learnerUniqueID1 = new ActiveXObject("Microsoft.XMLHTTP");
}
else
{
alert("Your browser does not support XMLHTTP!");
}
learnerUniqueID1.open("POST", url, true);
learnerUniqueID1.onreadystatechange = callbackZone;
learnerUniqueID1.send(null);
}
function callbackZone()
{
if (learnerUniqueID1.readyState == 4)
{
if (learnerUniqueID1.status == 200)
{
//update the HTML DOM based on whether or not message is valid
parseMessageZone();
}
else
{
flag='false';
alert('We have detected a break in your web connection, \n please login again to continue with your session');
}
}
}
function parseMessageZone()
{
var result = learnerUniqueID1.responseText;
}
function makePayment(obj)
{
try
{
var Id = obj.attributes["rel"].value
//alert(Id);
var res=confirm('Want to Continue.');
if(res == true)
{
startRequest(Id);
//return true;
}
else
{
return false;
}
}
catch(Error)
{
}
}
function startRequest(Id)
{
var milliseconds = 10000;
currentDate = new Date();
// start request
pollRequest(milliseconds, false, currentDate, 120000,Id);
}
function pollRequest(milliseconds, finshed, date, timeout,Id)
{
if((new Date()).getTime() > date.getTime()+timeout)
{
// 2-minute timeout passed
return;
}
if(!finished){
setTimeout(function(){
if(//check backend to see if finished) //which method will go here
{
fnCheckConnectivity(coursId);
pollRequest(milliseconds, true, date, timeout,Id);
}
else{
pollRequest(milliseconds, false, date, timeout,Id)
}
}, milliseconds);
return;
}
// when code reaches here, request has finished
}