Storing nfc tag in client pc webpage

Rails
1

hi.

i’m new to ruby on rails. at the moment i’m developing web app with
acr122u and iso/iec 14443a card.
i want client pc to open web page, swipe cards, lookup tags which is
already in the database then bring back some data to the page.
i’d already tried gem nfc or nfc-eventd, both of them can read tags
continuously.
but how do i pass the tag to a page or look it up in database?

thanks

2

On 22 November 2014 06:22, Patrick Y. [email protected] wrote:

hi.

i’m new to ruby on rails. at the moment i’m developing web app with
acr122u and iso/iec 14443a card.
i want client pc to open web page, swipe cards, lookup tags which is
already in the database then bring back some data to the page.
i’d already tried gem nfc or nfc-eventd, both of them can read tags
continuously.
but how do i pass the tag to a page or look it up in database?

I don’t know about the tags but if you don’t know how to look things
up in a database then I suggest working right through a good rails
tutorial such as railstutorial.org (which is free to use online) which
will show you the basics of rails. Then when you have found how to
work the card reader you will know how to deal with it in rails.

Colin

3

maybe its too wide… let me simplify.
i have a ruby script that reads NFC tags:

require ‘nfc’

ctx = NFC::Context.new
dev = ctx.open nil

loop do

p dev.pool.to_s

end

par example the output in the terminal is ‘c2 f3 44 12’.

i also have a webform with a text field with label “id”.

how do i pass the output to id.text_field? or… is it possible?

4

On 27 November 2014 at 09:30, Patrick Y. [email protected] wrote:

p dev.pool.to_s

end

par example the output in the terminal is ‘c2 f3 44 12’.

i also have a webform with a text field with label “id”.

how do i pass the output to id.text_field? or… is it possible?

Are you asking how to run a ruby script from the web browser, where
the script directly accesses hardware on the computer?

Colin

5

that’s an alternative i thought before… but yes.

6

On 27 November 2014 at 10:12, Patrick Y. [email protected] wrote:

that’s an alternative i thought before… but yes.

Please quote the previous message when replying so that it is easier
to follow the thread. Someone seeing your reply will not know what
you it is that you are saying yes to. Thanks.

I believe it is normally not possible to access hardware from the
browser. Would you want a web page you visit messing with the
hardware on your PC.

One option for you is to write an app that runs on the PC that fetches
the data and posts it to the rails server directly. There may be
other alternatives.

I don’t understand what you mean when you say “that’s an alternative i
thought before”. Alternative to what?

Colin