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export default function requestJson(method: string, url: string, params: object, successCallback, failureCallback) {
method = method.toUpperCase()
let body = null
if (method === 'GET') {
url = injectQueryStringParams(url, params)
} else {
body = encodeParams(params)
}
let xhr = new XMLHttpRequest()
xhr.open(method, url, true)
if (method !== 'GET') {
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded')
}
xhr.onload = function() {
if (xhr.status >= 200 && xhr.status < 400) {
try {
let res = JSON.parse(xhr.responseText)
successCallback(res, xhr)
} catch (err) {
failureCallback('Failure parsing JSON', xhr)
}
} else {
failureCallback('Request failed', xhr)
}
}
xhr.onerror = function() {
failureCallback('Request failed', xhr)
}
xhr.send(body)
}
function injectQueryStringParams(url: string, params) {
return url +
(url.indexOf('?') === -1 ? '?' : '&') +
encodeParams(params)
}
function encodeParams(params) {
let parts = []
for (let key in params) {
parts.push(encodeURIComponent(key) + '=' + encodeURIComponent(params[key]))
}
return parts.join('&')
}