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djax.js
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djax.js
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function ajax(opt, fn) {
if (typeof opt === "string") {
opt = { url: opt };
} else if (typeof opt !== "object" || !opt) {
throw new Error("Wrong arguments");
}
// Get the xhr object:
let xhr;
if (typeof opt.xhr === "function") {
xhr = opt.xhr();
} else if (ajax.XHR) {
xhr = new ajax.XHR();
} else {
throw new Error(
"XMLHttpRequest not found. You can specify which XMLHttpRequest " +
"you want to use by using `ajax({ xhr() { return myXhr; } })`."
);
}
// Callbacks:
let errors = [];
let successes = [];
// Check for given callbacks:
if (opt && fn) {
if (typeof fn === "function") successes.push(fn);
else if (Array.isArray(fn)) successes = successes.concat(fn);
}
if (typeof opt.success === "function") {
successes.push(opt.success);
} else if (Array.isArray(opt.success)) {
successes = successes.concat(opt.success);
}
if (typeof opt.error === "function") {
errors.push(opt.error);
} else if (Array.isArray(opt.error)) {
errors = errors.concat(opt.error);
}
// Other parameters:
let key;
let data;
let timer;
let conclude;
let textStatus;
let done = false;
let url = opt.url;
const type = opt.method || opt.type || "GET";
const dataType = opt.dataType || "json";
const contentType =
opt.contentType ||
(opt.contentType === false && opt.processData === false
? false
: "application/x-www-form-urlencoded");
if (!url || typeof url !== "string") {
throw new Error("Wrong arguments");
}
if (opt.data) {
if (typeof opt.data === "string" || !contentType) {
data = opt.data;
} else if (/json/.test(contentType)) {
data = JSON.stringify(opt.data);
} else {
data = [];
for (key in opt.data) {
if ({}.hasOwnProperty.call(opt.data, key)) {
data.push(
encodeURIComponent(key) + "=" + encodeURIComponent(opt.data[key])
);
}
}
data = data.join("&");
}
if (/GET|DELETE/i.test(type)) {
url += /\?/.test(url) ? "&" + data : "?" + data;
data = "";
}
}
xhr.onreadystatechange = () => {
if (+xhr.readyState === 4) {
done = true;
if (timer) clearTimeout(timer);
if (/^2/.test(xhr.status + "")) {
done = true;
textStatus = "success";
data = xhr.responseText;
if (/json/.test(dataType)) {
try {
data = data ? JSON.parse(data) : "";
} catch (e) {
data = data + "";
}
}
// Specific 204 HTTP status case:
if (+xhr.status === 204) {
textStatus = "nocontent";
data = undefined;
}
conclude = succ => succ.forEach(fnc => fnc(data, textStatus, xhr));
conclude(successes);
} else {
conclude = (_, errs) =>
errs.forEach(fnc =>
fnc(xhr, +xhr.status ? "error" : "abort", xhr.responseText)
);
conclude(null, errors);
}
}
};
// Check xhrFields
if (opt.xhrFields && typeof opt.xhrFields === "object") {
for (key in opt.xhrFields) {
if ({}.hasOwnProperty.call(opt.xhrFields, key)) {
xhr[key] = opt.xhrFields[key];
}
}
}
xhr.open(type, url, true);
if (contentType) {
xhr.setRequestHeader("Content-Type", contentType);
}
// Check custom headers:
if (opt.headers) {
for (key in opt.headers) {
if ({}.hasOwnProperty.call(opt.headers, key)) {
xhr.setRequestHeader(key, opt.headers[key]);
}
}
}
// Check the "beforeSend" callback:
if (
typeof opt.beforeSend === "function" &&
opt.beforeSend(xhr, opt) === false
) {
done = true;
conclude = (_, errs) =>
errs.forEach(fnc => fnc(xhr, "abort", xhr.responseText));
conclude(null, errors);
return xhr.abort();
}
// Check "timeout":
if (opt.timeout) {
timer = setTimeout(() => {
done = true;
xhr.onreadystatechange = () => {};
xhr.abort();
conclude = (_, errs) => errs.forEach(fnc => fnc(xhr, "timeout"));
conclude(null, errors);
}, opt.timeout);
}
// Send the AJAX call:
xhr.send(data);
// Promise:
xhr.done = function xhrDone(callback) {
if (typeof callback === "function") {
successes.push(callback);
} else if (Array.isArray(callback)) {
successes = successes.concat(callback);
} else {
throw new Error("Wrong arguments.");
}
// If the call has already been received:
if (done) {
if (typeof callback === "function") {
conclude([callback]);
} else if (Array.isArray(callback)) {
conclude(callback);
}
}
return this;
};
xhr.fail = function xhrFail(callback) {
if (typeof callback === "function") {
errors.push(callback);
} else if (Array.isArray(callback)) {
errors = errors.concat(callback);
} else {
throw new Error("Wrong arguments.");
}
// If the call has already been received:
if (done) {
if (typeof callback === "function") {
conclude(null, [callback]);
} else if (Array.isArray(callback)) {
conclude(null, callback);
}
}
return this;
};
xhr.then = function xhrThen(success, error) {
if (success) this.done(success);
if (error) this.fail(error);
// If the call has already been received:
if (done) {
if (!Array.isArray(success)) {
success = typeof success === "function" ? [success] : null;
}
if (!Array.isArray(error)) {
error = typeof error === "function" ? [error] : null;
}
conclude(success, error);
}
return this;
};
return xhr;
}
// Djax version:
ajax.version = "2.1.0";
// Check XMLHttpRequest presence:
if (typeof XMLHttpRequest !== "undefined") {
ajax.XHR = XMLHttpRequest;
}
export default ajax;
export const ajaxSettings = {
xhr() {
if (XMLHttpRequest) {
return new XMLHttpRequest();
}
return false;
}
};