https://hannahimlach.com/_jsapps/api/_cargo/_core/CargoXHR.js

1Cargo.utils = Cargo.utils || {};
2
3/**
4 *	Cargo.Core.CargoXHR wraps the native XMLHttpRequest with some extra features like retry.
5 *
6 *  Kinda implements the jQuery (http://api.jquery.com/jquery.ajax/) ajax options.
7 *
8 * @author Aart Röst / Cargo Collective
9 * 
10 */
11
12Cargo.utils.CargoXHR = function(options){
13
14	var self = this;
15
16	$.extend(this.options = {}, this.defaultOptions, options);
17
18	if(this.options.context === undefined){
19		this.options.context = this;
20	}
21
22	if(this.options.url === undefined){
23		throw 'no URL given, define "url" in the contructor\'s options object';
24	}
25
26	this.retries = 0;
27
28	this.xhr = new XMLHttpRequest();
29
30	this.xhr.addEventListener("abort", function(){
31		self.options.abort.apply(self.options.context, arguments);
32	}, false);
33	
34	this.xhr.addEventListener("error", function(){
35		self.options.error.apply(self.options.context, arguments);
36	}, false);
37	
38	this.xhr.addEventListener("load", function(){
39		self.options.success.apply(self.options.context, arguments);
40	}, false);
41
42	this.xhr.addEventListener("loadend", function(){
43		self.options.always.apply(self.options.context, arguments);
44	}, false);
45
46	this.xhr.upload.addEventListener("progress", function(e){
47		self.options.progress.apply(self.options.context, arguments);
48	}, false);
49
50	this.send();
51
52}
53
54Cargo.utils.CargoXHR.prototype.send = function(){
55
56	this.xhr.open(this.options.type, this.options.url, this.options.async);
57
58	for(var key in this.options.headers){
59		this.xhr.setRequestHeader(key, this.options.headers[key]);
60	}
61	
62	this.xhr.responseType = this.options.dataType;
63
64	this.options.beforeSend.call(this, this.xhr);
65
66	this.xhr.send(this.options.data);
67
68}
69
70Cargo.utils.CargoXHR.prototype.retry = function(){
71
72	if(this.retries++ < this.options.maxRetries){
73
74		Cargo.utils.CargoXHR.prototype.send.apply(this, arguments);
75
76	} else {
77		
78		this.abort();
79		return false;
80
81	}
82
83}
84
85Cargo.utils.CargoXHR.prototype.abort = function(){
86
87	if(typeof this.xhr === 'object'){
88		this.xhr.abort();
89	}
90
91}
92
93Cargo.utils.CargoXHR.prototype.defaultOptions = {
94	async: true,
95	beforeSend: function(XHR){
96
97	},
98	always: function(e){
99
100	},
101	success: function(e){
102
103	},
104	progress: function(e){
105
106	},
107	error: function(e) {
108
109	},
110	abort: function(e) {
111
112	},
113	type: 'GET',
114	url: undefined,
115	dataType: 'text',
116	headers: {},
117	data: null,
118	context: undefined,
119	maxRetries: 5
120}