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AJAX object
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(function (global) { | |
// Set up a namespace for our utility | |
var ajaxUtils = {}; | |
// Returns an HTTP request object | |
function getRequestObject() { | |
if (global.XMLHttpRequest) { | |
return (new XMLHttpRequest()); | |
} | |
else if (global.ActiveXObject) { | |
// For very old IE browsers (optional) | |
return (new ActiveXObject("Microsoft.XMLHTTP")); | |
} | |
else { | |
global.alert("Ajax is not supported!"); | |
return(null); | |
} | |
} | |
// Makes an Ajax GET request to 'requestUrl' | |
ajaxUtils.sendGetRequest = | |
function(requestUrl, responseHandler) { | |
var request = getRequestObject(); | |
request.onreadystatechange = | |
function() { | |
handleResponse(request, responseHandler); | |
}; | |
request.open("GET", requestUrl, true); | |
request.send(null); // for POST only | |
}; | |
// Only calls user provided 'responseHandler' | |
// function if response is ready | |
// and not an error | |
function handleResponse(request, | |
responseHandler) { | |
if ((request.readyState == 4) && | |
(request.status == 200)) { | |
responseHandler(request); | |
} | |
} | |
// Expose utility to the global object | |
global.$ajaxUtils = ajaxUtils; | |
})(window); |
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