вс 03 мая 2020, tags: ErlangN2OTutorial

Re-posting from 2014-09-25

N2O template (Nitrogen) basically is a bunch of Erlang records compiled into HTML code. You can read more about templates at https://synrc.com/apps/n2o/doc/web/ page. Here we want to show how all steps of the page creation. It will be done in several steps:

• Create a view
• Add a route to the routes.erl file

Let's create a view

$ touch apps/web/src/n2o_page.erl

Open file in an editor and add required functions

$ vim apps/web/src/n2o_page.erl

-module(n2o_page).                       % module name
-export([main/0]).                       % function extraction
-include_lib("n2o/include/wf.hrl").      % include wf.hrl header file

main() ->                                % definition of default called function
  #panel{body = <<"Hello records template!">>}.

Our first simplest view is ready. On the next step we should add the view to the routes.

Open routes.erl file and map path to the view

$ vim apps/web/src/routes.erl

route(<<"/n2o_page">>) -> n2o_page;  % n2o_page view will be rendered by /n2o_page url
route(_)               -> index.     % default view. '_' is matching any url

Ready. Let's compile the project and open in browser http://localhost:8002/n2o_page url.

$ ./rebar compile
$ erl -name "web@$(hostname)" -pa deps/*/ebin -pa apps/*/ebin -boot start_sasl -s web_app start