Gettin an input from user on html

[Adam Lee]

Hello everyone, I am writing a small ruby script that lists all the
files in a directory in a server at my work.

I wanna make buttons which users can click to sort the files.

Being a complete newbie, I don't know how to approach this. I guess I
can use the Mechanize gem, but looks overkill for this simple purpose.

Basically I need a simple way to invoke an array.sort method over http.

Thanks

 

[Brian Candler]

Hello everyone, I am writing a small ruby script that lists all the
files in a directory in a server at my work.

Is this a script which is run from the command-line?

I wanna make buttons which users can click to sort the files.

The question is, where do you want the button to appear?

If you want the button to appear on the user's desktop or in a native UI
window, then you need to use a UI library. There are many to choose
from, but shoes is a good starting point: http://www.shoooes.net/

If you want the button to appear in the user's web browser (e.g.
Firefox, IE, Opera), then you need to write a web server which responds
with the HTML to display a button. Look at Sinatra, Camping, Rails, or
even CGI.

Being a complete newbie, I don't know how to approach this. I guess I
can use the Mechanize gem, but looks overkill for this simple purpose.

Basically I need a simple way to invoke an array.sort method over http.

It sounds like you may have got this all back-to-front.

There are two parties to HTTP: the client and the server. The client
makes a request to the server, e.g. to fetch a page, and the server
sends back the page. The client then does whatever it likes with the
result, such as displaying it on-screen.

An example of a HTTP client is Firefox. And example of a HTTP server is
Apache. You put the content in Apache, and you retrieve it using
Firefox.

The Mechanize gem is also a HTTP client: you use it to connect to
existing websites and fetch pages. Instead of rendering the results, it
parses (breaks down) what it retrieves so you can process it in whatever
way you like.

If you want to "make a button" as you say, in a user's web browser, then
you need the following to happen:

HTTP GET /
client ------------------> server
<------------------
HTML response

The HTML response would contain the tags to display the button, e.g.
<form action="/sort">
<input type="submit" value="sort"/>
</form>

Then when the user clicks on the button, another exchange takes place:

HTTP POST /sort
client ------------------> server
<------------------
HTML response

This HTML might contain a page with the filenames all nicely sorted.

I think that this is too general a question to take further here. I
suggest you buy yourself a good book on Web programming, or google
around for example Ruby code you can learn from.

There is detailled documentation on HTML at the w3.org site - click on
the 'HTML' link under 'A to Z', then 'HTML 4.01 tutorial'. Also,
detailed information is available under the 'What - HTML 4.01' link. For
example, everything you could possibly want to know about HTML forms
(including buttons) is at
http://www.w3.org/TR/html401/interact/forms.html

There are tons of other HTML and web programming tutorials out there
though. Google is your friend.

HTH,

Brian.

 

[Adam Lee]

That cleared up many things. Thanks a lot Brian!!!

 

[Adam Lee]

Ok my case is the last case: button appears on web browser.

Here is what has to happen: When user visits the page, he sees a list of
items that was generated by Ruby script. Now there is a Sort button and
when he clicks it it he now sees a list of sorted items.

The frameworks you have suggested like Rails seem to be too much for
this simple function.

I guess right now (after studying bit about the HTTP GET/POST you
mentioned) all I need to find out is how to trigger (invoke array.sort
call) a ruby script passing.

Thank for your help Brian.