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//
// AJAX
//
(function() {
var defaultOpts = {
json: true
};
function createXMLHttpRequest() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
}
var xhr;
try {
xhr = new ActiveXObject('Msxml2.XMLHTTP');
} catch (e) {
try {
xhr = new ActiveXObject('Microsoft.XMLHTTP');
} catch (e) {}
}
if (!xhr) {
console.error('Your browser doesn\'t support XMLHttpRequest.');
}
return xhr;
}
function request(method, url, data, optarg1, optarg2) {
data = data || null;
var opts, callback;
if (optarg2 !== undefined) {
opts = optarg1;
callback = optarg2;
} else {
callback = optarg1;
}
opts = opts || {};
if (typeof callback != 'function') {
throw new Error('callback must be a function');
}
if (!url) {
throw new Error('no url specified');
}
switch (method) {
case 'GET':
if (isObject(data)) {
for (var k in data) {
if (data.hasOwnProperty(k)) {
url += (url.indexOf('?') == -1 ? '?' : '&')+encodeURIComponent(k)+'='+encodeURIComponent(data[k])
}
}
}
break;
case 'POST':
if (isObject(data)) {
var sdata = [];
for (var k in data) {
if (data.hasOwnProperty(k)) {
sdata.push(encodeURIComponent(k)+'='+encodeURIComponent(data[k]));
}
}
data = sdata.join('&');
}
break;
}
opts = Object.assign({}, defaultOpts, opts);
var xhr = createXMLHttpRequest();
xhr.open(method, url);
xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
if (method == 'POST') {
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
}
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
if ('status' in xhr && !/^2|1223/.test(xhr.status)) {
throw new Error('http code '+xhr.status)
}
if (opts.json) {
var resp = JSON.parse(xhr.responseText)
if (!isObject(resp)) {
throw new Error('ajax: object expected')
}
if (resp.error) {
throw new Error(resp.error)
}
callback(null, resp.response);
} else {
callback(null, xhr.responseText);
}
}
};
xhr.onerror = function(e) {
callback(e);
};
xhr.send(method == 'GET' ? null : data);
return xhr;
}
window.ajax = {
get: request.bind(request, 'GET'),
post: request.bind(request, 'POST')
}
})();
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