Created
July 26, 2012 15:17
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Javascript wrapper for cross domain requests.
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var XReq = function(params) { | |
this.init(params); | |
this.perform(); | |
} | |
XReq.prototype = { | |
'init': function(params) { | |
var members = { | |
'url':null, | |
'error':function(xhr, error, message) { | |
console.error([error, message]); | |
}, | |
'success':function(data) { | |
console.log(["No success handler for url " + that.url]); | |
}, | |
'dataType':'text', | |
'async':true, | |
'data':{}, | |
'type':'GET', | |
'xd':false | |
}; | |
this._aborted = false; | |
for (var i in members) { if (members.hasOwnProperty(i)) { | |
if (params[i] != undefined) { | |
this[i] = params[i]; | |
} else if (members[i] == null) { | |
console.error("Parameter " + i + " is required"); | |
} else { | |
this[i] = members[i]; | |
} | |
}} | |
if (this.url.match(CDN_DOMAIN)) { | |
this.xd = true; | |
} | |
if (! window.XDomainRequest) { | |
this.xd = false; | |
} | |
var that = this; | |
if (this.xd) { | |
this.xr = new XDomainRequest(); | |
} else { | |
this.xr = new XMLHttpRequest(); | |
} | |
}, | |
'perform':function() { | |
var query = '', send = ''; | |
var first = true; | |
for (var i in this.data) { if (this.data.hasOwnProperty(i)) { | |
query += (first?'':'&') + encodeURIComponent(i) +'='+encodeURIComponent(this.data[i]); | |
first = false; | |
}}; | |
if (this.type == 'GET') { | |
if (query.length) { query = '?' + query; } | |
this.xr.open(this.type, this.url+query, this.async); | |
} else { | |
this.xr.open(this.type, this.url, this.async); | |
this.xr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); | |
this.xr.setRequestHeader("Content-length", this.data.length); | |
this.xr.setRequestHeader("Connection", "close"); | |
send = query; | |
} | |
var that = this; | |
this.xr.onerror = function() { that.error(that.xr, 'Could not load URL '+that.url, that.xr.responseText); }; | |
if (this.xd) { | |
this.xr.onload = function() { | |
that.on_success(); | |
} | |
} | |
this.xr.onreadystatechange = function() { | |
var state = that.xr.readyState; | |
if (state == 0 || that._aborted) { | |
that.on_abort(); | |
} else if (state == 4) /** complete **/ { | |
try { | |
that.on_success(); | |
} catch (ex) { | |
that.error(that.xr, 'error', ex); | |
} | |
} | |
}; | |
try { | |
this.xr.send(send); | |
} catch (ex) { | |
that.error(that.xr, "Error making request ("+that.url+")", that.xr.responseText); | |
} | |
}, | |
'on_abort':function() { | |
this.error(this.xr, 'abort', ''); | |
}, | |
'on_success':function() { | |
if (this.dataType == 'xml') { this.success(this.xr.responseXML); } | |
else if (this.dataType == 'json') { | |
var text = this.xr.responseText; | |
var json = !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(text.replace(/"(\\.|[^"\\])*"/g, ''))) && eval('(' + text + ')'); | |
this.success(json); | |
} else { | |
this.success(this.xr.responseText); | |
} | |
}, | |
'abort' : function() { this._aborted = true; this.xr.abort(); } | |
} |
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added abort handling.