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Микро обертка для выполенения XHR-запросов
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| /** | |
| * Микро обертка для выполенения XHR-запросов | |
| * @namepace window.xhr | |
| * @example | |
| * xhr.load('/path/to', {type: 'POST'}, function (err, xhr) { | |
| * // ... | |
| * }); | |
| */ | |
| (function (global) { | |
| 'use strict'; | |
| var _preload = {}; | |
| function noop() { | |
| } | |
| function newXHR(req) { | |
| try { | |
| req = new global.XMLHttpRequest(); | |
| } catch (err) { | |
| try { | |
| req = new global.ActiveXObject('Msxml2.XMLHTTP'); | |
| } catch (err) { | |
| try { | |
| req = new global.ActiveXObject('Microsoft.XMLHTTP'); | |
| } catch (err) { | |
| req = {readyState: 4, status: -1}; | |
| req.open = req.send = noop; | |
| } | |
| } | |
| } | |
| return req; | |
| } | |
| var xhr = { | |
| version: '0.5.0', | |
| /** | |
| * Вид запросов по умолчанию | |
| * @type {boolean} | |
| */ | |
| async: true, | |
| /** | |
| * Центральная обработка запросов | |
| * @type {Function} | |
| */ | |
| oncomplete: null, | |
| /** | |
| * Загрузить ресурс | |
| * @param {string} url | |
| * @param {Object|Function} [options] | |
| * @param {Function} [callback] | |
| */ | |
| load: function (url, options, callback) { | |
| if (typeof options === 'function') { | |
| callback = options; | |
| options = {}; | |
| } | |
| var req = newXHR(), | |
| async, | |
| startTime = new Date(), | |
| complete = function (err) { | |
| if (err || req.readyState === 4) { | |
| complete = noop; // затираем пустышкой | |
| err = err || (req.status !== 200 && req.status !== 201); | |
| req.duration = new Date() - startTime; | |
| req.onreadystatechange = null; | |
| callback && callback(err, req); | |
| xhr.oncomplete && xhr.oncomplete(err, req); | |
| } | |
| }; | |
| options = options || {}; | |
| async = options.async === void 0 ? this.async : options.async; | |
| req.url = url; | |
| req.onerror = function (evt) { | |
| req.onerror = null; | |
| complete(evt); | |
| }; | |
| try { | |
| req.open(options.type || 'GET', url, async); | |
| req.send(null); | |
| if (async) { | |
| req.onreadystatechange = function () { | |
| complete(); | |
| }; | |
| } | |
| else { | |
| complete(); | |
| } | |
| } catch (err) { | |
| complete(err); | |
| } | |
| }, | |
| /** | |
| * Загрузка ресурса с возможность повтора и eval для js | |
| * @param {string} url | |
| * @param {function} [oncomplete] | |
| * @param {number} [attempt] | |
| * @return {XMLHttpRequest} | |
| */ | |
| fetchResource: function (url, oncomplete, attempt) { | |
| var fetchResource = xhr.fetchResource; | |
| var filename = url.split('/').pop().replace(/(\.\w+)(\?.*)?$/, '$1'); | |
| attempt = attempt | 0; | |
| return xhr.load(url, function (err, xhr) { | |
| var evalTime = new Date(); | |
| xhr.error = err; | |
| xhr.attempt = attempt; | |
| xhr.filename = filename; | |
| xhr.filesize = (xhr.responseText || '').length; | |
| xhr.evalDuration = 0; | |
| try { | |
| // Eval source | |
| if (!err && /\.js$/.test(filename)) { | |
| eval.call(window, xhr.responseText + '\n//@ sourceURL=' + url); | |
| } | |
| } catch (error) { | |
| err = error; | |
| xhr.evalError = error; | |
| } finally { | |
| xhr.evalDuration = new Date() - evalTime; | |
| } | |
| if (err) { | |
| fetchResource.onerror && fetchResource.onerror(err, xhr); | |
| } | |
| if (err && (attempt < fetchResource.maxAttempts)) { | |
| // Retry | |
| attempt++; | |
| fetchResource.onretry && fetchResource.onretry(err, xhr); | |
| fetchResource(url, oncomplete, attempt); | |
| } | |
| else { | |
| oncomplete && oncomplete(err, xhr); | |
| fetchResource.oncomplete && fetchResource.oncomplete(err, xhr); | |
| } | |
| }); | |
| }, | |
| patchRequireJS: function (require) { | |
| require.load = function (context, moduleName, url) { | |
| xhr.fetchResource(url, function () { | |
| // todo: catch error; | |
| context.completeLoad(moduleName); | |
| }); | |
| }; | |
| }, | |
| preload: function (name, url, options) { | |
| if (_preload[name] === void 0) { | |
| _preload[name] = {fns: []}; | |
| } | |
| xhr.load(url, options, function (err, xhr) { | |
| var item = _preload[name]; | |
| item.err = err; | |
| item.xhr = xhr; | |
| item.fns && item.fns.forEach(function (fn) { | |
| fn(err, xhr); | |
| }); | |
| item.fns = null; | |
| }); | |
| }, | |
| wait: function (name, oncomplete) { | |
| var item = _preload[name]; | |
| if (item === void 0) { | |
| _preload[name] = {fns: [oncomplete]}; | |
| } else if (item.xhr === void 0) { | |
| _preload[name].fns.push(oncomplete); | |
| } else { | |
| oncomplete(item.err, item.xhr); | |
| } | |
| } | |
| }; | |
| /** | |
| * Последовательная загрузка ресурсов | |
| * @param {string[]} urls | |
| * @param {function} [oncomplete] | |
| */ | |
| xhr.fetchResource.series = function fetchResourceSeries(urls, oncomplete) { | |
| var queue = urls.slice(0); // clone | |
| (function _fetchNext() { | |
| var url = queue.shift(); | |
| if (url) { | |
| xhr.fetchResource(url, function (err) { | |
| if (err) { | |
| oncomplete(err); | |
| } else { | |
| _fetchNext(); | |
| } | |
| }); | |
| } else { | |
| oncomplete(); | |
| } | |
| })(); | |
| }; | |
| /** | |
| * Масимальное кол-во попыток при загрузке ресурсов | |
| * @type {number} | |
| */ | |
| xhr.fetchResource.maxAttempts = 2; | |
| // Export | |
| global['xhr'] = xhr; | |
| })(window); |
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| (function(l){function m(){}function p(a){try{a=new l.XMLHttpRequest}catch(c){try{a=new l.ActiveXObject("Msxml2.XMLHTTP")}catch(d){try{a=new l.ActiveXObject("Microsoft.XMLHTTP")}catch(b){a={readyState:4,status:-1},a.open=a.send=m}}}return a}var h={},g={version:"0.5.0",async:!0,oncomplete:null,load:function(a,c,d){"function"===typeof c&&(d=c,c={});var b=p(),k=new Date,e=function(a){if(a||4===b.readyState)e=m,a=a||200!==b.status&&201!==b.status,b.duration=new Date-k,b.onreadystatechange=null,d&&d(a, | |
| b),g.oncomplete&&g.oncomplete(a,b)};c=c||{};var f=void 0===c.async?this.async:c.async;b.url=a;b.onerror=function(a){b.onerror=null;e(a)};try{b.open(c.type||"GET",a,f),b.send(null),f?b.onreadystatechange=function(){e()}:e()}catch(q){e(q)}},fetchResource:function(a,c,d){var b=g.fetchResource,k=a.split("/").pop().replace(/(\.\w+)(\?.*)?$/,"$1");d|=0;return g.load(a,function(e,f){var g=new Date;f.error=e;f.attempt=d;f.filename=k;f.filesize=(f.responseText||"").length;f.evalDuration=0;try{!e&&/\.js$/.test(k)&& | |
| eval.call(window,f.responseText+"\n//@ sourceURL="+a)}catch(n){e=n,f.evalError=n}finally{f.evalDuration=new Date-g}e&&b.onerror&&b.onerror(e,f);e&&d<b.maxAttempts?(d++,b.onretry&&b.onretry(e,f),b(a,c,d)):(c&&c(e,f),b.oncomplete&&b.oncomplete(e,f))})},patchRequireJS:function(a){a.load=function(a,d,b){g.fetchResource(b,function(){a.completeLoad(d)})}},preload:function(a,c,d){void 0===h[a]&&(h[a]={fns:[]});g.load(c,d,function(b,c){var e=h[a];e.err=b;e.xhr=c;e.fns&&e.fns.forEach(function(a){a(b,c)}); | |
| e.fns=null})},wait:function(a,c){var d=h[a];void 0===d?h[a]={fns:[c]}:void 0===d.xhr?h[a].fns.push(c):c(d.err,d.xhr)}};g.fetchResource.series=function(a,c){var d=a.slice(0);(function k(){var a=d.shift();a?g.fetchResource(a,function(a){a?c(a):k()}):c()})()};g.fetchResource.maxAttempts=2;l.xhr=g})(window); |
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xhr.openможет бросить исключение. Нуженtry/catchдляreq.open(options.type || 'GET', url, async);