Anhang's Contemplations

Not sure why expiration isn’t built into the HTML5 specs for LocalStorage, but I put together this little snippet today.

It uses Modernizr (http://www.modernizr.com/) to check for LocalStorage support.

AZHU.storage = {
	save : function(key, jsonData, expirationMin){
		if (!Modernizr.localstorage){return false;}
		var expirationMS = expirationMin * 60 * 1000;
		var record = {value: JSON.stringify(jsonData), timestamp: new Date().getTime() + expirationMS}
		localStorage.setItem(key, JSON.stringify(record));
		return jsonData;
	},
	load : function(key){
		if (!Modernizr.localstorage){return false;}
		var record = JSON.parse(localStorage.getItem(key));
		if (!record){return false;}
		return (new Date().getTime() < record.timestamp && JSON.parse(record.value));
	}
}

Gist: https://gist.github.com/1096149