www.moparscape.org/source/javascripts/jsonp.js

/*MooTools, My Object Oriented Javascript Tools. Copyright (c) 2006-2007 Valerio Proietti, <http://mad4milk.net>, MIT Style License.||Clientcide Copyright (c) 2006-2008, http://www.clientcide.com/wiki/cnet-libraries#license*/

MooTools.More={'version':'1.2.3.1'};var Log=new Class({log:function(){Log.logger.call(this,arguments)}});Log.logged=[];Log.logger=function(){if(window.console&&console.log)console.log.apply(console,arguments);else Log.logged.push(arguments)};Class.refactor=function(original,refactors){$each(refactors,function(item,name){var origin=original.prototype[name];if(origin&&(origin=origin._origin)&&typeof item=='function')original.implement(name,function(){var old=this.previous;this.previous=origin;var value=item.apply(this,arguments);this.previous=old;return value});else original.implement(name,item)});return original};Request.JSONP=new Class({Implements:[Chain,Events,Options,Log],options:{url:'',data:{},retries:0,timeout:0,link:'ignore',callbackKey:'callback',injectScript:document.head},initialize:function(options){this.setOptions(options);this.running=false;this.requests=0;this.triesRemaining=[]},check:function(){if(!this.running)return true;switch(this.options.link){case'cancel':this.cancel();return true;case'chain':this.chain(this.caller.bind(this,arguments));return false}return false},send:function(options){if(!$chk(arguments[1])&&!this.check(options))return this;var type=$type(options),old=this.options,index=$chk(arguments[1])?arguments[1]:this.requests++;if(type=='string'||type=='element')options={data:options};options=$extend({data:old.data,url:old.url},options);if(!$chk(this.triesRemaining[index]))this.triesRemaining[index]=this.options.retries;var remaining=this.triesRemaining[index];(function(){var script=this.getScript(options);this.log('JSONP retrieving script with url: '+script.get('src'));this.fireEvent('request',script);this.running=true;(function(){if(remaining){this.triesRemaining[index]=remaining-1;if(script){script.destroy();this.send(options,index);this.fireEvent('retry',this.triesRemaining[index])}}else if(script&&this.options.timeout){script.destroy();this.cancel();this.fireEvent('failure')}}).delay(this.options.timeout,this)}).delay(Browser.Engine.trident?50:0,this);return this},cancel:function(){if(!this.running)return this;this.running=false;this.fireEvent('cancel');return this},getScript:function(options){var index=Request.JSONP.counter,data;Request.JSONP.counter++;switch($type(options.data)){case'element':data=document.id(options.data).toQueryString();break;case'object':case'hash':data=Hash.toQueryString(options.data)}var src=options.url+(options.url.test('\\?')?'&':'?')+(options.callbackKey||this.options.callbackKey)+'=Request.JSONP.request_map.request_'+index+(data?'&'+data:'');if(src.length>2083)this.log('JSONP '+src+' will fail in Internet Explorer, which enforces a 2083 bytes length limit on URIs');var script=new Element('script',{type:'text/javascript',src:src});Request.JSONP.request_map['request_'+index]=function(data){this.success(data,script)}.bind(this);return script.inject(this.options.injectScript)},success:function(data,script){if(script)script.destroy();this.running=false;this.log('JSONP successfully retrieved: ',data);this.fireEvent('complete',[data]).fireEvent('success',[data]).callChain()}});Request.JSONP.counter=0;Request.JSONP.request_map={};var JsonP=Class.refactor(Request.JSONP,{initialize:function(){var params=Array.link(arguments,{url:String.type,options:Object.type});options=(params.options||{});options.url=options.url||params.url;if(options.callBackKey)options.callbackKey=options.callBackKey;this.previous(options)},getScript:function(options){var queryString=options.queryString||this.options.queryString;if(options.url&&queryString)options.url+=(options.url.indexOf("?")>=0?"&":"?")+queryString;var script=this.previous(options);if($chk(options.globalFunction)){window[options.globalFunction]=function(r){JsonP.requestors[index].handleResults(r)}}return script},request:function(url){this.send({url:url||this.options.url})}});