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ns.xmlhttprequest.js
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ns.xmlhttprequest.js
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/**
* @projectDescription A set of reuseable cross-platform components
*
* @author Rob Griffiths <rob@bytespider.eu>
* @version 0.1
*/
var NS = NS || {};
var undefined = window.undefined;
var defined = window.defined ||
function(variable) {
return variable !== undefined;
};
/**
* Returns a XMLHttpRequest wrapper for the browsers native capabilities
*
* @constructor
* @classDescription Creates a W3C compatable XMLHttpRequest
*
* @param [{Object}] config
*
* @return {NS.XMLHttpRequest}
* @type {Object}
* @author Rob Griffiths
* @version 0.2
*/
NS.XMLHttpRequest = function NS_XMLHttpRequest(config) {
config = config || {};
// Private variables
var self = this;
var _ns = NS; /** @type {NS} */
var _nsmb = {}
try {
var _nsmb = NS.MessageBus.getInstance(); /** @type {NS.MessageBus} */
} catch (err) {}
var _proto = NS.XMLHttpRequest; /** @type {NS.XMLHttpRequest} */
var _xhr = _XHRFactory(); /** @type {XMLHttpRequest} */
var _headers = {};
// Public variables
this.url = config.url || '';
this.method = config.url || '';
this.async = defined(config.async) ? config.async : true;
this.user = config.user || null;
this.password = config.password || null;
this.proxy = config.proxy || '';
this.onreadystatechange = config.onreadystatechange || null;
this.status = 0;
this.statusText = '';
this.readyState = _proto.UNSENT;
this.responseText = '';
this.responseXML = '';
// Public methods
/**
*
* @memberOf NS.XMLHttpRequest
*
* @param {String} [method]
* @param {String} [url]
* @param {String} [async]
* @param {String} [user]
* @param {String} [password]
*/
this.open = function (method, url, async, user, password) {
this.url = url || this.url;
this.method = method || this.method;
this.async = defined(async) ? async : this.async;
this.user = user || this.user;
this.password = password || this.password;
var basicAuth = this.user && this.password;
if (basicAuth === true) {
_xhr.open(this.method, this.url, this.async, this.user, this.password);
} else {
_xhr.open(this.method, this.url, this.async);
}
this.readyState = _xhr.readyState;
return this; // allow chaining
};
/**
*
* @param {String} header
* @param {String} value
*
* @memberOf NS.XMLHttpRequest
*/
this.setRequestHeader = function (header, value) {
_headers[header] = value;
return this; // allow chaining
};
/**
* @return {Object}
* @type {Object}
*
* @memberOf NS.XMLHttpRequest
*/
this.getAllRequestHeaders = function () {
return _headers;
};
/**
*
* @param {Object|String} data
* @memberOf NS.XMLHttpRequest
*/
this.send = function (data) {
data = data || null;
if (this.readyState === _proto.UNSENT) {
// We'll assume that this was a configured request
this.open();
}
_xhr.onreadystatechange = _XHROnReadyStateChange;
_headers['Via'] = this.proxy;
for (var i in _headers) {
_xhr.setRequestHeader(i, _headers[i]);
}
return _xhr.send(data);
};
/**
* @memberOf NS.XMLHttpRequest
*/
this.abort = function () {
_xhr.abort();
this.readyState = _proto.OPENED;
try {
_nsmb.publish(topic + '.' + _proto.ABORTED, {});
} catch(err) {}
return this; // allow chaining
};
/**
* Simple wrapper for XMLHttpRequest's version
*
* @type {Object}
* @memberOf NS.XMLHttpRequest
*/
this.getAllResponseHeaders = function () {
return _xhr.getAllResponseHeaders();
};
/**
* Simple wrapper for XMLHttpRequest's version
*
* @param {String} header
* @type {String}
* @memberOf NS.XMLHttpRequest
*/
this.getResponseHeader = function (header) {
return _xhr.getResponseHeader(header);
};
this.toString = function (){
return 'NS.XMLHttpRequest';
};
function _XHRFactory() {
if (defined(window.XDomainRequest)) {
// IE proprietary but it's W3C compliant
return new window.XDomainRequest();
} else if (defined(window.XMLHttpRequest)) {
// W3C compliant
return new window.XMLHttpRequest();
} else {
// IE
try {
return new ActiveXObject('MSXML2.XMLHTTP');
} catch (err) {
try {
return new ActiveXObject('Microsoft.XMLHTTP');
} catch (err) {
throw 'NS.XMLHttpRequest: No compliant XMLHttpRequest object found';
}
}
}
}
function _XHROnReadyStateChange() {
// Copy XHR stuff over to us
self.status = this.status;
self.statusText = this.statusText;
self.readyState = this.readyState;
self.responseText = this.responseText || '';
self.responseXML = this.responseXML || '';
var response = {
'status': self.status + ' ' + self.statusText,
'data': {
'text': self.responseText,
'xml': self.responseXML
}
};
try {
_nsmb.publish(_proto.READY_STATE_CHANGE, response);
if (self.readyState == _proto.DONE) {
if (_xhr.status == 0 || _xhr.status == 200 || _xhr.status == 304) {
_nsmb.publish(_proto.SUCCESS, response);
} else {
_nsmb.publish(_proto.FAILURE, response);
}
}
} catch (err){};
if(self.onreadystatechange !== null){
self.onreadystatechange();
}
}
return this;
};
// Constants
// States
NS.XMLHttpRequest.UNSENT = 0;
NS.XMLHttpRequest.OPENED = 1;
NS.XMLHttpRequest.HEADERS_RECEIVED = 2;
NS.XMLHttpRequest.LOADING = 3;
NS.XMLHttpRequest.DONE = 4;
// Request methods
NS.XMLHttpRequest.GET = 'GET';
NS.XMLHttpRequest.POST = 'POST';
NS.XMLHttpRequest.PUT = 'PUT';
NS.XMLHttpRequest.UPDATE = 'UPDATE';
NS.XMLHttpRequest.DELETE = 'DELETE';
NS.XMLHttpRequest.OPTIONS = 'OPTIONS';
// Loose coupling flags
NS.XMLHttpRequest.READY_STATE_CHANGE = 'ready-state-change';
NS.XMLHttpRequest.SUCCESS = 'success';
NS.XMLHttpRequest.FAILURE = 'failure';
NS.XMLHttpRequest.ABORTED = 'aborted';