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    <p>I guess what you want to change in your CSS / html , are states. Like if a lamp is on/off? Then you need to save each state in a mySQL DB and just grab the data for each user. If you want it to look like realtime for online users, then use js(ajax) to sync data regularly.</p> <p>Alternative way without a DB would be with files.</p> <p>If you don't wanna use mysql for this, you can use files. I suggest using ini files. For more on <a href="https://stackoverflow.com/questions/5695145/how-to-read-and-write-to-an-ini-file-with-php">how to read/write ini files, you can visit this question.</a> It's super simple and you'll be able to have each variable in a nifty array. </p> <p>What you need: A bit of PHP, a little bit of jQuery (or js), understanding of GET variables</p> <p>I suggest you create 3 files.</p> <blockquote> <p><strong>index.php</strong> :<br> Your main page which is the client. Pulls info using get variables. You can use jQuery.get() for this.</p> <p><strong>getstate.php</strong> :<br> This is the file which will read the ini file and give you back the states for each device. Read them with jQuery.get() from index.php .</p> <p><strong>savestate.php</strong>:<br> This is the file which you'll send the new states to from index.php Example request: <a href="http://address.goes.here/savestate.php?bedroomlight=1&amp;garagelight=0" rel="nofollow noreferrer">http://address.goes.here/savestate.php?bedroomlight=1&amp;garagelight=0</a></p> </blockquote> <p>Whats even more interesting is that ini files can be written/read easily by many programming languages so you can manipulate the data using your Raspberry Pi easily. (say someone turns of a light, a script polling state could change the ini file)</p>
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    1. POHow to modify and save html/css in server-side?
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    1. COExactly, I want to change the states. Can I do this with only javascript?
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    2. COShort answer no. You need to save states serverside, which JS cannot do. With PHP, JS, and files though you can. Check my revised answer above.
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    3. COCome to think of it, you don't necessarily need ini files to do this. A simple text file with comma separated values would do. Guess .ini is neater/cooler to use. :P
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