[Swansea Hackspace] Raspberry Pi - kiosk mode

[Emyr Morris]

yessss.... ajax - I was hoping to avoid ajax

Just as I pushed the send button on my initial email JS and AJAX came to my
mind.

the project started off easy, I was going to just supply JPEGs on a memory
stick plugged into the tellies

Then he said about turning things on and off... changing prices on a weekly
basis, and then wanting it controlled from his ipad

that is when it became a client server setup

that was the point I should have jacked the price up significantly to push
him back to keeping it simple, but I am a sucker for a challenge.

It is all databased so AJAX isn't a problem

I have really optimised all the files so a refresh isn't at all bad, the
nice HD background is the slowest thing loading.

what is scary though is if it loses connection to the server and the
customers don't have a menu to look at. There a JS solution would be much
better as it could cache data until it gets a new connection

I had thought of doing a cron job to detect if it had lost the server
connection, and if so it would simply pipe a pre-defined screen capture to
/dev/fb0



On 23 January 2015 at 21:41, Justin Mitchell <justin at discordia.org.uk>
wrote:

> On Fri, 2015-01-23 at 20:28 +0000, Emyr Morris wrote:
>
> > I was hoping to have something monitor chromium and if it detected
> > that the browser had frozen / stopped responding or hadn't refreshed
> > for a certain period of time, it would close the browser and re-open
> > it
> >
> >
> > I thought I had found an example a few months ago and bookmarked it,
> > but I can not for the life of me find the example again.
> >
> >
> > for example, I have a web page that is refreshed every 5 mins, if
> > chromium has not refreshed in 10 mins it needs to be restarted.
> >
> >
> > currently I am using a very simple
> > <meta http-equiv="refresh" content="120">
> > to reload the page,
> > I would value advice. Thanks
>
> If there is a webserver on the pi have some javascript polling a simple
> cgi script (a bash script would do) via ajax, so it isnt disturbing the
> main page.
>
> its easy enough to check that a process is still running from a shell
> script, but thats no indication that the page involved is still
> running/reloading.
>
> Whilst there may be some cache and status files that belong to the
> browser, i dont imagine that it would be a terribly reliable indication
> of anything.
>
> as an aside, those kind of page reloads are awefully klunky and
> disruptive, if you need any guidance on ajax, jquery, and other more
> modern stuff I or one of the others will gladly help i'm sure.
>
>
>
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>



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