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N2O templates. Nitrogen

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 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

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