Java Reference
In-Depth Information
Exercise 1 Solution
function HttpRequest(sUrl, fpCallback)
{
this.url = sUrl;
this.callBack = fpCallback;
this.async = true;
this.request = this.createXmlHttpRequest();
}
HttpRequest.prototype.createXmlHttpRequest = function () {
if (window.XMLHttpRequest)
{
var oHttp = new XMLHttpRequest();
return oHttp;
}
else if (window.ActiveXObject)
{
var versions =
[
“MSXML2.XmlHttp.6.0”,
“MSXML2.XmlHttp.3.0”
];
for (var i = 0; i < versions.length; i++)
{
try
{
oHttp = new ActiveXObject(versions[i]);
return oHttp;
}
catch (error)
{
//do nothing here
}
}
}
return null;
}
HttpRequest.prototype.send = function()
{
this.request.open(“GET”, this.url, this.async);
if (this.async)
{
var tempRequest = this.request;
var fpCallback = this.callBack;
function request_readystatechange()
{
if (tempRequest.readyState == 4)
{
