IndexedDb async example

example.js

var indexDB = {};
indexDB.db = null;
indexDB.logger = function(err){ console.log(err); };
indexDB.dbUpgradeneeded = function(storeNames, e) {
	storeNames.forEach(function(store) {
		e.currentTarget.result.createObjectStore(store, { keyPath: "id"});
	});
    this.db = e.target.result;
};
indexDB.performDbOpen = function(e){
    this.db = e.target.result;
    var afterPerformer = this.afterDbOpenPerformer;
    while(afterPerformer){ 
    	afterPerformer.perform();
    	afterPerformer = afterPerformer.next;
    }
};
indexDB.to_pending = function(f){
	lastPerformer = this.afterDbOpenPerformer;
	while(lastPerformer.next){ lastPerformer = lastPerformer.next }
	lastPerformer.next = { next: null, perform: f }
	// function(orig, pending){ orig(); pending(); }.bind(this, this.afterDbOpen.bind(this), f);
};
indexDB.afterDbOpenPerformer = { perform: function(){}, next: null };
indexDB.connect = (function(storeNames){
    /*index DB*/
    if (!window.webkitIndexedDB) {
        console.warn('IndexedDB not supported');
        return;
    }
    var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
    var connect = indexedDB.open('TizenUSS',1);
    connect.onerror = this.logger;
    connect.onsuccess = this.performDbOpen.bind(this);
    connect.onupgradeneeded = this.dbUpgradeneeded.bind(this, storeNames);
    return connect;
}).call(indexDB, ["listTraining","listOptions"]);
/*вставка или обновление в БД*/
indexDB.insert = function(value,storeName,onsuccess,onerror){
    if (!this.db){this.to_pending(this.insert.bind(this, value, storeName, onsuccess, onerror));return;}
    var request = this.db.transaction([storeName], "readwrite").objectStore(storeName).put(value);
    request.onerror = (onerror || this.logger).bind(null, request);
    request.onsuccess = (onsuccess || function(){}).bind(null, request);
};
/*получение по ключу*/
indexDB.get = function(storeName,f,value,onsuccess){
	if (!this.db){this.to_pending(this.get.bind(this, storeName, f, value, onsuccess));return;}
	this.db.transaction([storeName], "readonly").objectStore(storeName).get(value).onsuccess = function(event) {
	   f(event.target.result);
	};
};
/*получение по ключу*/
indexDB.getAll = function(storeName, onsuccess, onerror){
	if (!this.db){this.to_pending(this.getAll.bind(this, storeName, onsuccess, onerror));return;}
	// this.to_pending(this.getAll.bind(this, storeName, f, onsuccess))
    var request = this.db.transaction([storeName], "readonly").objectStore(storeName).getAll();
    request.onerror = (onerror || this.logger).bind(null, request);
    request.onsuccess = (onsuccess || function(){}).bind(null, request);
};