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I have a game where, based upon the visible tiles in the viewport, I need to retrieve data of items in the visible tiles. I am planning to use Javascript to AJAX request a batch based upon the visible tiles which contain image tags like Google Maps. The item information will be in JSON format.

What is the best approach to fetch the data? I currently have class I wrote in javascript which determines the visible columns/rows and offsets relative to the visible area shown. Each item is also user contributed and will be rendered in canvas or SVG layer .

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The "best" approach would probably be one that works. What problems are you having with your current one? – Nicol Bolas Mar 28 '12 at 5:35
This is what I got as a prototype. jsfiddle.net/mac1175/p2GqB/16 – mitch Mar 28 '12 at 10:13
@NicolBolas I am trying to incorporate DOM elements in order to have some kind of backwards compatibility with older browsers (I have messed a lot with Canvas and the implementations and their performance varies, especially with mobile devices). One of the problems after I fetch the data is figuring out the offset of my items relative to the container. – mitch Mar 28 '12 at 10:17
Question subject and body talk of completely different things. – Jari Komppa Jan 8 at 10:01
Following Jari Komppa's comment, i strongly suggest a clarification in both title and body. – Vincent Piel Feb 12 at 5:47

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I would really suggest using HTML5 for this. You can send AJAX requests using javascript, but have a much easier time displaying graphics, and making tile-based maps. It's very simple to learn once you're fluent with javascript.

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