Vanilla JS utils and example usage with the Brightcove API for IE 8 compatibility

Utils, Async handling and Brightcove

//borrowed this indexOf polyfill from MDN
if (!Array.prototype.indexOf){
	Array.prototype.indexOf = function(elt /*, from*/){
		var len = this.length >>> 0;
		var from = Number(arguments[1]) || 0;
		from = (from < 0) ? Math.ceil(from) : Math.floor(from);
		if (from < 0)
			from += len;
		for (; from < len; from++){
			if (from in this && this[from] === elt)
		    	return from;
		}
		return -1;
	};
}

var utils = (function(){
	return {
		ajaxGet: function(url, cb, passVar){
		    var request = new XMLHttpRequest();
		    request.open('GET', url, true);
		    request.onreadystatechange = function(){
		        if (this.readyState === 4) {
		            if (this.status >= 200 && this.status < 400)
		                cb(request.responseText, passVar);
		            else
		                console.log("Something went wrong with the XMLHttpRequest!\nERROR: " + this.status);
		        }
		    };
		    request.send();
		},
		addListener: function(obj, type, fn){
	  		if (obj.attachEvent){
	    		obj['e'+type+fn] = fn;
	    		obj[type+fn] = function(){
	    			obj['e'+type+fn](window.event);
	    		}
	    		obj.attachEvent('on'+type, obj[type+fn]);
	  		} else
	    		obj.addEventListener(type, fn, false);
		},
		containsAll: function(haystack, needles){ 	
			var i = needles.length;
	        while (i--){
	        	if (haystack.indexOf(needles[i]) === -1)
					return false;
			}
	  		return true;
		},
		/*getChildren: function(el){
		    var children = [], i = el.children.length;
		    while (i--){
		        if (el.children[i].nodeType != 8)
		            children.unshift(el.children[i]);
		    }
		    return children;
		},*/
		ready: function(fn){
		    if (document.readyState != 'loading')
		    	fn();
		    else if (document.addEventListener)
		    	document.addEventListener('DOMContentLoaded', fn);
		    else {
		        document.attachEvent('onreadystatechange', function() {
		            if (document.readyState != 'loading')
		            	fn();
		        });
		    }
		},
		wait: (function(originalArr, callback){
	  		var self = this;  	
	    	self.eventsArray = [];
	    	self.varObj = {};
	    	self.originalArr = originalArr;
	    	return function(variable, functionName){
	    		self.eventsArray.push(functionName);
	    		self.varObj[functionName] = variable;
		    	if (utils.containsAll(self.eventsArray, self.originalArr))
		    		callback(self.varObj);
	    	};
	    }),
	}
})();

var BCL = {
    onTemplateLoaded: function(id){
    	var api = brightcove.api,
    		modules = api.modules.APIModules;
        this.player = api.getExperience(id);
        this.exp = this.player.getModule(modules.EXPERIENCE);
   		this.con = this.player.getModule(modules.CONTENT);
    },
    onTemplateReady: function(){
        BCL.videoPlayer = BCL.player.getModule(brightcove.api.modules.APIModules.VIDEO_PLAYER);
		BCL.videoPlayer.getCurrentVideo(BCL.callbacks.temp);           
    },
	callbacks: {
		json: function(data){
		    var fake = document.createElement('div');
		    fake.innerHTML = data;
		    var json = JSON.parse(fake.getElementsByTagName('script')[0].innerHTML);
		    wait(json, "json");	    
		},
		ready: function(){	
			var links = document.getElementById("links");
    		wait(links, "ready");
		},
		temp: function(dto){
			wait(dto.id, "temp");
		},
		loadLinks: function(varObj){
			var linkData = varObj.json[varObj.temp],
	        	i = linkData && linkData.length,
	        	template = "";
		    while (i--)
		      	template += '<li><a href="' + linkData[i].href + '" target="_blank">' + linkData[i].text + '</a></li>';
		   	varObj.ready.innerHTML = template.length && template || "There are no links yet for this video";
		},
		executeAndListen: function(obj){
	    	BCL.callbacks.loadLinks(obj);
		    //add event listener to player for change event
		    utils.addListener(BCL.videoPlayer, brightcove.api.events.MediaEvent.CHANGE, BCL.callbacks.loadLinks(obj));
		}
	}
};

//call immediately
var wait = new utils.wait(["json", "ready", "temp"], BCL.callbacks.executeAndListen);
utils.ajaxGet("some/url/json.html", BCL.callbacks.json);
utils.ready(BCL.callbacks.ready);