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April 10, 2016 09:16
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/* | |
* Copyright 2012-2013 (c) Pierre Duquesne <stackp@online.fr> | |
* Licensed under the New BSD License. | |
* https://github.com/stackp/promisejs | |
*/ | |
(function(exports) { | |
function Promise() { | |
this._callbacks = []; | |
} | |
Promise.prototype.then = function(func, context) { | |
var p; | |
if (this._isdone) { | |
p = func.apply(context, this.result); | |
} else { | |
p = new Promise(); | |
this._callbacks.push(function () { | |
var res = func.apply(context, arguments); | |
if (res && typeof res.then === 'function') | |
res.then(p.done, p); | |
}); | |
} | |
return p; | |
}; | |
Promise.prototype.done = function() { | |
this.result = arguments; | |
this._isdone = true; | |
for (var i = 0; i < this._callbacks.length; i++) { | |
this._callbacks[i].apply(null, arguments); | |
} | |
this._callbacks = []; | |
}; | |
function join(promises) { | |
var p = new Promise(); | |
var results = []; | |
if (!promises || !promises.length) { | |
p.done(results); | |
return p; | |
} | |
var numdone = 0; | |
var total = promises.length; | |
function notifier(i) { | |
return function() { | |
numdone += 1; | |
results[i] = Array.prototype.slice.call(arguments); | |
if (numdone === total) { | |
p.done(results); | |
} | |
}; | |
} | |
for (var i = 0; i < total; i++) { | |
promises[i].then(notifier(i)); | |
} | |
return p; | |
} | |
function chain(funcs, args) { | |
var p = new Promise(); | |
if (funcs.length === 0) { | |
p.done.apply(p, args); | |
} else { | |
funcs[0].apply(null, args).then(function() { | |
funcs.splice(0, 1); | |
chain(funcs, arguments).then(function() { | |
p.done.apply(p, arguments); | |
}); | |
}); | |
} | |
return p; | |
} | |
/* | |
* AJAX requests | |
*/ | |
function _encode(data) { | |
var payload = ""; | |
if (typeof data === "string") { | |
payload = data; | |
} else { | |
var e = encodeURIComponent; | |
var params = []; | |
for (var k in data) { | |
if (data.hasOwnProperty(k)) { | |
params.push(e(k) + '=' + e(data[k])); | |
} | |
} | |
payload = params.join('&') | |
} | |
return payload; | |
} | |
function new_xhr() { | |
var xhr; | |
if (window.XMLHttpRequest) { | |
xhr = new XMLHttpRequest(); | |
} else if (window.ActiveXObject) { | |
try { | |
xhr = new ActiveXObject("Msxml2.XMLHTTP"); | |
} catch (e) { | |
xhr = new ActiveXObject("Microsoft.XMLHTTP"); | |
} | |
} | |
return xhr; | |
} | |
function ajax(method, url, data, headers) { | |
var p = new Promise(); | |
var xhr, payload; | |
data = data || {}; | |
headers = headers || {}; | |
try { | |
xhr = new_xhr(); | |
} catch (e) { | |
p.done(promise.ENOXHR, ""); | |
return p; | |
} | |
payload = _encode(data); | |
if (method === 'GET' && payload) { | |
url += '?' + payload; | |
payload = null; | |
} | |
xhr.open(method, url); | |
var content_type = 'application/x-www-form-urlencoded'; | |
for (var h in headers) { | |
if (headers.hasOwnProperty(h)) { | |
if (h.toLowerCase() === 'content-type') | |
content_type = headers[h]; | |
else | |
xhr.setRequestHeader(h, headers[h]); | |
} | |
} | |
xhr.setRequestHeader('Content-type', content_type); | |
function onTimeout() { | |
xhr.abort(); | |
p.done(promise.ETIMEOUT, "", xhr); | |
} | |
var timeout = promise.ajaxTimeout; | |
if (timeout) { | |
var tid = setTimeout(onTimeout, timeout); | |
} | |
xhr.onreadystatechange = function() { | |
if (timeout) { | |
clearTimeout(tid); | |
} | |
if (xhr.readyState === 4) { | |
var err = (!xhr.status || | |
(xhr.status < 200 || xhr.status >= 300) && | |
xhr.status !== 304); | |
p.done(err, xhr.responseText, xhr); | |
} | |
}; | |
xhr.send(payload); | |
return p; | |
} | |
function _ajaxer(method) { | |
return function(url, data, headers) { | |
return ajax(method, url, data, headers); | |
}; | |
} | |
var promise = { | |
Promise: Promise, | |
join: join, | |
chain: chain, | |
ajax: ajax, | |
get: _ajaxer('GET'), | |
post: _ajaxer('POST'), | |
put: _ajaxer('PUT'), | |
del: _ajaxer('DELETE'), | |
/* Error codes */ | |
ENOXHR: 1, | |
ETIMEOUT: 2, | |
/** | |
* Configuration parameter: time in milliseconds after which a | |
* pending AJAX request is considered unresponsive and is | |
* aborted. Useful to deal with bad connectivity (e.g. on a | |
* mobile network). A 0 value disables AJAX timeouts. | |
* | |
* Aborted requests resolve the promise with a ETIMEOUT error | |
* code. | |
*/ | |
ajaxTimeout: 0 | |
}; | |
if (typeof define === 'function' && define.amd) { | |
/* AMD support */ | |
define(function() { | |
return promise; | |
}); | |
} else { | |
exports.promise = promise; | |
} | |
})(this); |
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