Simple wrapper for localStorage, needs underscore.js

Storage.js

// needs underscore.js

Storage = function(key, defaults)
{
	this.key = key;
	this.defaults = defaults;
	this.data = {};
};

Storage.prototype.load = function(what)
{
	if(typeof(localStorage) != 'undefined'){
		var s = localStorage.getItem(this.key);

		if(s !== null){
			try{
				this.data = JSON.parse(s);
				this.data = _.defaults(this.data, this.defaults);
			}catch(e){
				this.data = s;
			}

			if(typeof what !== "undefined" && (typeof this.data === "object"))
				return this.data[what];
			else
				return this.data;
		}else{
			return this.defaults;
		}
	}
	return null;
};

Storage.prototype.save = function(data)
{
	if(typeof(localStorage) != 'undefined'){
		if(typeof data === "string"){
			localStorage.setItem(this.key, data);
		}else if(typeof data === "object"){
			data = _.defaults(data, this.defaults);
			localStorage.setItem(this.key, JSON.stringify(data));
		}
	}

	return data;
};


// Usage

var storage = new Storage('app-settings-or-something', {activeTab: '', url: 'http://localhost'});

storage.save({activeTab: '#theme-settings'});

storage.load(); // {activeTab: '#theme-settings', url: 'http://localhost'}

storage.load('activeTab'); // #theme-settings


var storage2 = new Storage('simple-string', '#my-element-id');
storage2.save('#my-another-element-id');
storage2.load(); // #my-another-element-id