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Este ShareCode es un duplicado de e8ad69b231d9fd6cf8f15d494de7b965
1 2 3 var Ajax = function() {4     5     this._xhr = null;6     this.url = '';7     this.method = 'GET';8     this.async = true;9     this.retries = 3;10     this.timeout = 3000; // milliseconds11     this.data = null;12     this.aborted = false;13     this.callbacks = ({14         progress:null,15         done:null,16         error:null,17         presend:null18         });19         20 };21 22 Ajax.prototype.retry = function() {23     this.retries--;24     var that = this;25     26     // Abort current request if exists27     null === this._xhr || this._xhr.abort();28 29     var xhr = this._xhr = new XMLHttpRequest();30     xhr.open(this.method, this.url, this.async);31     xhr.onreadystatechange = function(event) {32         if (xhr.readyState == XMLHttpRequest.DONE && xhr.status != 0) {33             if (null != that.callbacks.done) {34                 that.callbacks.done(xhr);35             }36         }37     };38     xhr.onerror = function(event) {39         if (null != that.callbacks.error)40             that.callbacks.error({'number':3,'description':'Connection refused'});41     }42     if (null != this.callbacks.presend)43         this.callbacks.presend(that._xhr);44     xhr.send(this.data);45     46     setTimeout(function() {47         if (that.aborted) {48             // WAS ABORTED49         } else if (null !== that._xhr && that._xhr.readyState === XMLHttpRequest.DONE && that._xhr.status != 0) {50             // ALL OK51         } else if (that.retries<=0) {52             null === that._xhr || that._xhr.abort();53             if (null != that.callbacks.error)54                 that.callbacks.error({'number':1,'description':'Timeout'});55         } else {56             that.retry();57         }58     }, this.timeout);59 }60 61 Ajax.prototype.send = function(data) {62     var that = this;63     64     this.data = data;65     this.aborted = false;66     this.retry();67 };68 69 Ajax.prototype.abort = function() {70     this.aborted = true;71     null === this._xhr || this._xhr.abort();72     if (null != this.callbacks.error)73         this.callbacks.error({'number':2,'description':'Aborted'});74 };75 76 window.addEventListener('load', function(e){77     var a = new Ajax();78     a.url = 'http://www.treeweb.es/request2';79     a.callbacks.done = function(xhr) {80         logger.log(a);81     };82     a.callbacks.error = function(error) {83         logger.log(error);84     }85     a.callbacks.presend = function(xhr) {86         //logger.log(xhr);87     }88     a.send('');89     90     logger.show();91 }, true);92 93 94 95
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