xhr.js is a library(< 2Kb) to make AJAX/HTTP restful requests with XMLHttpRequest. It has similar API with Python-requests.

1. Install xhr.js

npm install xhr.js

2. import xhr.js

UMD import is supported, then get global object: XHR.

import XHR from 'xhr.js';

// or

var XHR = require("xhr.js");

or link with script in html files:

<script src="dist/xhr.min.js"></script>

3. use class XHR

var xhr = XHR(async); // default is async. you can set sync use  XHR(false)
xhr.on('success', function(result) {
	console.log('status:', result.status);
	console.log('statusText:', result.statusText);
	console.log('url:', result.url);
	console.log('responseType:', result.responseType);
	console.log('text:', result.text);
	console.log('headers:', result.headers);

	console.log('ok:', result.ok()); // get the json result.
	console.log('json:', result.json()); // get the json result.
	console.log('xml:', result.xml());
	console.log('blob:', result.blob());
});

xhr.get('package.json', {'a': 'b'});

Another post demo:

var xhr = XHR();
xhr.post('/post_url', {'a': 'b'}, function(r) {
	r = r.json(); // get the json result.
	// write your code
});

Upload file with FormData object:

var fd = new FormData(document.querySelector('#submit_form'));

var xhr = new XHR();
xhr.post('/submit/new', fd, function(r) {
    // request success
    r = r.json();
    console.log(r);
});

The API of xhr instance.

1. xhr.request(method, url, body, onsuccess, onfail): request the url, with the method.
2. xhr.on(event_key, event_func): bind the request result(ready, error, success, fail), with result instance as it input.
3. xhr.get(url, params, onsuccess, onfail): get request.
4. xhr.post(url, params, onsuccess, onfail): post request.
5. xhr.setRequestHeader(header_name, header_value): append a header.
6. xhr.setAsync(aysnc): set request async / sync.
7. xhr.url(): get the request url.
8. xhr.body(): get the request body.
9. xhr.abort(): abort request.
10. xhr.reset(): reset the xhr instance, such url, headers, body, events.

The evnet keys is for API on.

1. ready: when xhr is ready.
2. success: when status_code is 200.
3. fail: when status_code is not 200.

The api is for request callback function paramter result.

1. result.text: get all response text;
2. result.status: the server response code;
3. result.statusText: the server response code text, e.g. ok (status code is 200).
4. result.responseType: response type;
5. result.headers: get all the response headers object;
6. result.ok(): is request ok;
7. result.json(): get the json object of response text;
8. result.xml(): get the xml object of response text;
9. result.blob(): get the blob object of response text;

• request auth
• a http test chrome plugin, like postman.

MIT