[Erlangweb-users] [long] Re: demos

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 Michael P. and Erlang-Web folks,

   thank you for ErlangWeb and all your efforts.

 Follows is how I have set up a test "application"; I have a 
 question about it.  My goal is to only have a single "special"
 directory structure (you'll see below I have to make a symlink 
 between my special dir off of templates/ so it is replicated off 
 of docroot/).
 I would also like to be able for arbitrary *.html files to be able
 to execute <wpart .../> code.  QUESTIONS are repeated at the end
 after the explanation of my configuration.

 The application, wpart_gerl, displays thumbnails of images in a directory.
 From an html file, you can call, e.g. 

 <wpart:gerl type="thumbnails" start="3" max="7" dir="some/directory/"/>

 which in the above case would display 7 thumbnails starting at the 3rd
 image from directory "some/directory" (which has to be available off 
 of docroot/).  Though probably not needed for the following question,
 I have attached wpart_gerl.erl to this mail.

 So, on to my present configuration...

 no problems here,  I can call funs from wpart_gerl or app_two 
---
 erlangweb-1.1.1/lib/wpart_gerl-0.9/{ebin, src, &etc}
 erlangweb-1.1.1/lib/app_two-1.0/{ebin, src, &etc}
---

I have the following directories configured ...

---
 erlangweb-1.1.1/docroot/2008_motorcycle_trip/images
 erlangweb-1.1.1/templates/2008_motorcycle_trip -> ../docroot/2008_motorcycle_trip
---
 The template 2008_ ... directory is a symbolic link to the docroot directory.
 I apparently need it so I can display arbitrary image files rather than have
 to list each image filename in the dispatch.conf file.

 in the 2008_motorcycle_trip directory I have some *.html files, e.g. 2008_start.html 
---
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <title>Triumph road trip, start</title>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 </head>
 <body>
   <wpart:gerl type="thumbnails" start="1" max="1" dir="2008_motorcycle_trip/images/"/>
   <br/>
   <h4> <wpart:lookup key="remainder"/> pictures remaining </h4>
   <a href="p2">page two</a>
 </body>
 </html>
---
 The pertinent part is the <wpart:gerl .../> code and also the <a href="p2" ... code
 The subdirectory 2008_motorcycle_trip/images contains the images.

 dispatch.conf looks like
---
%%
%% remember to make the symlink
%% cd templates && /bin/ln -s ../docroot/2008_motorcycle_trip  2008_motorcycle_trip
%%
{static, "/start", "2008_motorcycle_trip/2008_start.html"}. 
{static, "/p2", "2008_motorcycle_trip/2008_page_two.html"}.
{static, "/p3", "2008_motorcycle_trip/2008_page_three.html"}.
          %% Finds files off templates/2008_motorcycle_trip directory,
          %% <wpart:gerl .../> code gets called and runs fine.

{static, "2008_motorcycle_trip/.*", enoent}.   
          %% Finds files off docroot/2008_motorcycle_trip directory, necessary
          %% for arbitrary images to show, sufficient for other *.html files to
          %% show though their <wpart:gerl ...> code never gets called.  So, if
          %% I want to run 2008_page_three.html from URL, the image would not show
%% this shows image: http://localhost:8080/2008_motorcycle_trip/images/2008_trip_pony_express_sign_with_triumph.jpg
%% though this: http://localhost:8080/2008_motorcycle_trip/2008_page_two.html
%% displays page but does not call the <wpart:gerl .../> code hence no image
---

 The embedded comments pretty much tell it all.  I need a {static, regexp, path}
 for every html file I want, otherwise the <wpart:gerl .../> code will not be called.
 I don't mean it won't run correctly, best I can tell it doesn't even get called.

 I apparently need the enoent entry so arbitrary images can be shown.  However, using 
 enoent means I need the directory available from docroot/.  I'd rather not have
 to replicate an existing directory (even though 'replicate' isn't quite true, it
 is only a symlink though I'd like to avoid that if possible).

 For the {static, "/start" ... /p2 /p3 } entries to work, I need the directory
 off of templates.  Doesn't matter if I preface the target path with "/" or not,
 I get error {{enoent, "/2008_motorcycle_trip/2008_start.html"  ... 
 if I remove the symlink from docroot/2008_motorcycle_trip to template/2008_mo ...

 And, in order to have the html files run their <wpart:gerl .../> code, I have to
 explicitly create a {static, "/whatever", "path/to/whatever.html"} entry for each
 and every page.  Otherwise the page will display but no thumbnails (of course,
 because <wpat:gerl.../> doesn't get to run.

****************
 QUESTIONS:

 1) I'm probably going to have a lot of pages so I would like to not have
    to enter each and every page name (or alias) in the  dispatch.conf
    file.
    Is it possible to run arbitrary *.html pages with embedded 
    <wpart:gerl .../> code?

    Arbitrary, as in "don't have to every html filename in the dispatch file".

 2) Is there some way to run the arbitrary html and display the images from
    a *single* "special" directory (structure) rather than having to replicate
    or copy structure off of templates/ and also docroot/  ?

****************

 Thanks for any clues on accomplishing what I describe above, or to confirm
 that I cannot do what I want and can then stop trying different things.

 ~Michael

On Sat, Nov 29, 2008 at 08:43:25AM +0000, Michal Ptaszek wrote:
> Hello,
> Demo service (to be more accurate - a few demo services) - building a web shop from scratch - will be, I hope, ready soon. It will contain the whole code written and explained almost line-by-line, so it should be very helpful for people, who has just started working with Erlang Web.
> It is great to know, that people are interested in EW :)
> 
> ----- "Francisco Benavides" <fra...@gm...> wrote:
> 
> > Hi,
> > 
> > I have read the tutorial, yet many things are unclear for me, being it
> > that I am new to Erlang and the way this Framework works. Can some one
> > provide a small but working demo/example, like a login/authentication
> > with forms and all? The tutorial is good in terms of looking in depth,
> > but I think that for new comers, like me, we need some thing more to
> > the point and complete, a working complete sample/code that we can
> > grab, compile and run as a reference.
> > 
> > Thank you so much for the support so far.
> > 
> > Have a nice weekend!
> > 
> > Rgs!/Fco
> 
> Best regards,
> -- 
> Michal Ptaszek
> www.erlang-consulting.com
> 
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-- 
Michael McDaniel
Portland, Oregon, USA
http://autosys.us