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AJAX with memoization
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// | |
// Author: Dustin Diaz | |
// http://dustindiaz.com/faster-ajax/ | |
// | |
var asyncRequest = function() { | |
function handleReadyState(o, callback, fallback) { | |
if (!o || o.readyState != 4) return; | |
if (o.status == 200) { | |
if (callback) { | |
callback(o); | |
} | |
} else if (fallback) { | |
fallback(o); | |
} | |
} | |
var getXHR = function() { | |
var http; | |
try { | |
http = new XMLHttpRequest; | |
getXHR = function() { | |
return new XMLHttpRequest; | |
}; | |
} | |
catch(e) { | |
var msxml = [ | |
'MSXML2.XMLHTTP.3.0', | |
'MSXML2.XMLHTTP', | |
'Microsoft.XMLHTTP' | |
]; | |
for (var i=0, len = msxml.length; i < len; ++i) { | |
try { | |
http = new ActiveXObject(msxml[i]); | |
getXHR = function() { | |
return new ActiveXObject(msxml[i]); | |
}; | |
break; | |
} | |
catch(e) {} | |
} | |
} | |
return http; | |
}; | |
return function(method, uri, postData, callback, fallback) { | |
var http = getXHR(); | |
http.open(method, uri, true); | |
http.onreadystatechange = function() { | |
handleReadyState(http, callback, fallback); | |
}; | |
http.send(postData || null); | |
return http; | |
}; | |
}(); |
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