vis-postmonger/postmonger.min.js

An ultra-lightweight Javascript utility for simplified cross-domain messaging.

/*
 * Postmonger.js   version 0.0.13
 * https://github.com/kevinparkerson/postmonger
 *
 * Copyright (c) 2012-2014 Kevin Parkerson
 * Available via the MIT or new BSD license.
 * Further details and documentation:
 * http://kevinparkerson.github.com/postmonger/
 *
 *///
(function(root,factory){if(typeof define==="function"&&define.amd){define("postmonger",[],function(){return factory(root)})}else{root.Postmonger=factory(root)}})(this,function(root){root=root||window;var exports=exports||undefined;var Postmonger;var previous=root.Postmonger;var _window=root.addEventListener||root.attachEvent?root:window;var Connection,Events,Session;if(typeof exports!=="undefined"){Postmonger=exports}else{Postmonger={}}Postmonger.noConflict=function(){root.Postmonger=previous;return this};Postmonger.version="0.0.13";Connection=Postmonger.Connection=function(options){options=typeof options==="object"?options:{};var connect=options.connect||_window.parent;var from=options.from||"*";var to=options.to||"*";var self=this;if(typeof connect==="string"){connect=document.getElementById(connect)}if(connect&&!connect.postMessage&&connect.jquery){connect=connect.get(0)}if(connect&&!connect.postMessage&&(connect.contentWindow||connect.contentDocument)){connect=connect.contentWindow||connect.contentDocument}if(!(connect&&connect.postMessage)){if(_window.console&&_window.console.warn){_window.console.warn(" Warning: Postmonger could not establish connection with ",options.connect)}return false}self.connect=connect;self.to=to;self.from=from;return self};Events=Postmonger.Events=function(){var eventSplitter=/\s+/;var self=this;self._callbacks={};self._has=function(obj,key){return Object.prototype.hasOwnProperty.call(obj,key)};self._keys=function(obj){if(Object.keys){return Object.keys(obj)}if(typeof obj!=="object"){throw new TypeError("Invalid object")}var keys=[];for(var key in obj){if(self._has(obj,key)){keys[keys.length]=key}}return keys};self.on=function(events,callback,context){var calls,event,node,tail,list;if(!callback){return self}events=events.split(eventSplitter);self._callbacks=self._callbacks||{};calls=self._callbacks;while(event=events.shift()){list=calls[event];node=list?list.tail:{};tail={};node.next=tail;node.context=context;node.callback=callback;calls[event]={tail:tail,next:list?list.next:node}}return self};self.off=function(events,callback,context){var calls=self._callbacks;var event,node,tail,cb,ctx;if(!calls){return}if(!(events||callback||context)){delete self._callbacks;return self}events=events?events.split(eventSplitter):self._keys(calls);while(event=events.shift()){node=calls[event];delete calls[event];if(!node||!(callback||context)){continue}tail=node.tail;while((node=node.next)!==tail){cb=node.callback;ctx=node.context;if((callback&&cb)!==callback||(context&&ctx)!==context){self.on(event,cb,ctx)}}}return self};self.trigger=function(events){var event,node,calls,tail,args,all,rest;if(!(calls=self._callbacks)){return self}all=calls.all;events=events.split(eventSplitter);rest=Array.prototype.slice.call(arguments,1);while(event=events.shift()){if(node=calls[event]){tail=node.tail;while((node=node.next)!==tail){node.callback.apply(node.context||self,rest)}}if(node=all){tail=node.tail;args=[event].concat(rest);while((node=node.next)!==tail){node.callback.apply(node.context||self,args)}}}return self};return self};Session=Postmonger.Session=function(){var args=arguments.length>0?Array.prototype.slice.call(arguments,0):[{}];var connections=[];var incoming=new Events;var outgoing=new Events;var self=this;var connection,i,j,l,ln,postMessageListener;self.on=incoming.on;self.off=incoming.off;self.trigger=outgoing.trigger;self.end=function(){incoming.off();outgoing.off();if(_window.removeEventListener){_window.removeEventListener("message",postMessageListener,false)}else if(_window.detachEvent){_window.detachEvent("onmessage",postMessageListener)}return self};for(i=0,l=args.length;i<l;i++){connection=new Connection(args[i]);if(connection){for(j=0,ln=connections.length;j<ln;j++){if(connections[j].connect===connection.connect&&connections[j].from===connection.from&&connections[j].to===connection.to){connection=null;break}}if(connection){connections.push(connection)}}}postMessageListener=function(event){var conn=null;var message=[];var data;var k,len;for(k=0,len=connections.length;k<len;k++){if(connections[k].connect===event.source){conn=connections[k];break}}if(!conn){return false}if(conn.from!=="*"&&conn.from!==event.origin){return false}try{data=JSON.parse(event.data);if(!data.e){return false}}catch(e){return false}message.push(data.e);delete data.e;for(k in data){message.push(data[k])}incoming["trigger"].apply(root,message)};if(_window.addEventListener){_window.addEventListener("message",postMessageListener,false)}else if(_window.attachEvent){_window.attachEvent("onmessage",postMessageListener)}else{if(_window.console&&_window.console.warn){_window.console.warn("WARNING: Postmonger could not listen for messages on window %o",_window)}return false}outgoing.on("all",function(){var args=Array.prototype.slice.call(arguments,0);var message={};var k,len;message.e=args[0];for(k=1,len=args.length;k<len;k++){message["a"+k]=args[k]}for(k=0,len=connections.length;k<len;k++){connections[k].connect.postMessage(JSON.stringify(message),connections[k].to)}});return self};return Postmonger});