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README.md
phoenix-klxrb.pdf

README.md

Phonix Framework Demo

Start the project

$ mix phoenix.new my_app
* creating my_app/config/config.exs
* creating my_app/config/dev.exs
* creating my_app/config/prod.exs
* creating my_app/config/prod.secret.exs
* creating my_app/config/test.exs
* creating my_app/lib/my_app.ex
* creating my_app/lib/my_app/endpoint.ex
* creating my_app/test/views/error_view_test.exs
* creating my_app/test/support/conn_case.ex
* creating my_app/test/support/channel_case.ex
* creating my_app/test/test_helper.exs
* creating my_app/web/channels/user_socket.ex
* creating my_app/web/router.ex
* creating my_app/web/views/error_view.ex
* creating my_app/web/web.ex
* creating my_app/mix.exs
* creating my_app/README.md
* creating my_app/web/gettext.ex
* creating my_app/priv/gettext/errors.pot
* creating my_app/priv/gettext/en/LC_MESSAGES/errors.po
* creating my_app/web/views/error_helpers.ex
* creating my_app/lib/my_app/repo.ex
* creating my_app/test/support/model_case.ex
* creating my_app/priv/repo/seeds.exs
* creating my_app/.gitignore
* creating my_app/brunch-config.js
* creating my_app/package.json
* creating my_app/web/static/css/app.css
* creating my_app/web/static/js/app.js
* creating my_app/web/static/js/socket.js
* creating my_app/web/static/assets/robots.txt
* creating my_app/web/static/assets/images/phoenix.png
* creating my_app/web/static/assets/favicon.ico
* creating my_app/test/controllers/page_controller_test.exs
* creating my_app/test/views/layout_view_test.exs
* creating my_app/test/views/page_view_test.exs
* creating my_app/web/controllers/page_controller.ex
* creating my_app/web/templates/layout/app.html.eex
* creating my_app/web/templates/page/index.html.eex
* creating my_app/web/views/layout_view.ex
* creating my_app/web/views/page_view.ex

Fetch and install dependencies? [Yn] y
* running mix deps.get
* running npm install && node node_modules/brunch/bin/brunch build

We are all set! Run your Phoenix application:

    $ cd my_app
    $ mix phoenix.server

You can also run your app inside IEx (Interactive Elixir) as:

    $ iex -S mix phoenix.server

Before moving on, configure your database in config/dev.exs and run:

    $ mix ecto.create
$ cd my_app
$ mix ecto.create
The database for MyApp.Repo has been created.

Create Post scaffolding

$ cd my_app
$ mix phoenix.gen.html Post posts title:string body:string
* creating web/controllers/post_controller.ex
* creating web/templates/post/edit.html.eex
* creating web/templates/post/form.html.eex
* creating web/templates/post/index.html.eex
* creating web/templates/post/new.html.eex
* creating web/templates/post/show.html.eex
* creating web/views/post_view.ex
* creating test/controllers/post_controller_test.exs
* creating priv/repo/migrations/20160229151801_create_post.exs
* creating web/models/post.ex
* creating test/models/post_test.exs

Add the resource to your browser scope in web/router.ex:

    resources "/posts", PostController

Remember to update your repository by running migrations:

    $ mix ecto.migrate

Add resources "/posts", PostController to web/router.ex and run the migration:

$ mix ecto.migrate

23:22:35.058 [info]  == Running MyApp.Repo.Migrations.CreatePost.change/0 forward

23:22:35.059 [info]  create table posts

23:22:35.064 [info]  == Migrated in 0.0s

Let's make sure the test are passing:

mix test
................

Finished in 0.3 seconds (0.2s on load, 0.08s on tests)
16 tests, 0 failures

Randomized with seed 12674

And let's see if we can see the web application:

mix phoenix.server
[info] Running MyApp.Endpoint with Cowboy using http on port 4000
29 Feb 23:26:00 - info: compiled 5 files into 2 files, copied 3 in 610ms

Head to browser http://localhost:4000/posts

Spend some of your time to look at model and controller that phoenix is created for you

Look into Supervision tree

$ iex -S mix phoenix.server
iex> :observer.start

Channels

mix  phoenix.gen.channel Room rooms
* creating web/channels/room_channel.ex
* creating test/channels/room_channel_test.exs

Add the channel to your `web/channels/user_socket.ex` handler, for example:

    channel "rooms:lobby", MyApp.RoomChannel

Follow instruction and edit channel file web/channels/room_channel.ex to:

defmodule MyApp.RoomChannel do
  use MyApp.Web, :channel

  def join("rooms:lobby", payload, socket) do
    if authorized?(payload) do
      {:ok, socket}
    else
      {:error, %{reason: "unauthorized"}}
    end
  end

  def handle_in("new:msg", payload, socket) do
    broadcast socket, "new:msg", payload
    {:reply, {:ok, payload}, socket}
  end

  defp authorized?(_payload) do
    true
  end
end

Enable socket module in web/static/js/app.js and update the socket module web/static/js/socket.js:

import {Socket} from "phoenix"

let socket = new Socket("/socket", {params: {token: window.userToken}})

socket.connect()

let channel = socket.channel("rooms:lobby", {})
channel.join()
  .receive("ok", resp => {
      console.log("Joined successfully", resp)
  })
  .receive("error", resp => { console.log("Unable to join", resp) })

channel.on("new:msg", (resp) => {
    var html = `<i>${resp.user}</i>: ${resp.body}<br />`
    document.getElementById('chat').innerHTML = document.getElementById('chat').innerHTML + html
    console.log(resp)
})

let triggerBox = function() {
    var btn = document.getElementById('msg-snd')
    btn.onclick = function () {
       var msg = document.getElementById('msg-box');
       channel.push("new:msg", {"user": "web", body: msg.value})
       msg.value = ""
    }
}
document.addEventListener('DOMContentLoaded', triggerBox, false);
export default socket

Add chat elements to index page in web/templates/page/index.html.eex

<input type="text" id="msg-box"> <input id="msg-snd" type="button" value="send!"> <div id="chat">

Open separate browser and play with your chat server. There are libraries to work with Phonix for iOS and Android.