Bigger cookie-like files for local data storage (browser "caching" of complex structures)

I am developing a browser based game, and I have a big map there. The terrain of the map is static. Therefore, I have some thousands of tiles that will not change (whether they represent a forest, a desert, whatever), just the players above it can change.

Hence, I wanted to store all my map in the player's computer. I am working with Ruby on Rails, and those map information are passed from the server to the javascript that runs on the user browser, in order to render a pretty map. But it makes me pretty sad to have a 200kb .html file, containing all those map related information.

What would be the simplest way to solve this issue? Cookies! Well. That's what I thought. A complete map information can get to almost 200kb (they are pretty big). A cookie can have at most 4kb.. I don't feel 开发者_开发问答that the right way to achieve my objective is to create tons of cookies, one for each row of the map, for instance. Is there any more elegant way to have this static information lie on the player's browser, without creating lots of cookies? A way to cache it on his browser? I mean.. I can cache a 400kb image, why can't I cache a 200kb map structure?

Thanks in advance! Fernando.

---

Well, HTML Local Storage gives you 5 MB (though data is stored *as strings*, so the actual amount of data you can fit in the container is likely a lot less than 5 MB.

This limit is oddly fluid. For one thing, it's just a recommended limit; and for another, i.e., Webkit-based browsers use UTF-16, which immediately cuts that in half (2.5 MB).

Browser support for Local Storage is good: IE, Firefox, Safari 4.0+, Chrome 4.0+, and Opera 10.5+. Both iPhone and Android are supported above versions 3.0 and 2.0. respectively.

Using Local Storage to preserve game state appears to be a proto-typical use case.

Finally, Paul Kinlan published an excellent step-by-step tutorial on HTML5Rocks, which i highly recommend (though it's a little more than a year old).

---

Have you considered storing it in a js file? Most browser will cache linked js files, allowing you to only serve it every once in a while. It would be very simple to deploy.