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<html>
<head>
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/sky.css">
<link rel="stylesheet" href="css/custom.css">
<link rel="stylesheet" href="lib/css/zenburn.css">
<link href='https://fonts.googleapis.com/css?family=Indie+Flower|Chelsea+Market' rel='stylesheet' type='text/css'>
</head>
<body>
<div class="reveal">
<div class="slides">
<section data-markdown>
## Javascript!
-Rob Clayburn
</section>
<section>
<h2>About me</h2>
<img src="images/rob.jpg#thirty" class="fragment" data-fragment-index="4">
<ul style="float:right;width:50%" >
<li class="fragment" data-fragment-index="1">Rob Clayburn</li>
<li class="fragment" data-fragment-index="2">Creator of Fabrik</li>
<li class="fragment" data-fragment-index="3">Part of the JED development team</li>
<li class="fragment" data-fragment-index="4">Partial to dressing up as a daffodil</li>
</ul>
</section>
<section data-markdown>
## So what should I expect in this talk anyway?
- A brief look at JavaScript's history
- Joomla and JavaScript
- What might be missing?
- Whisper, a potential solution
</section>
<section data-markdown>
<script type="text/template">
### A brief history of JavaScript
* 1995 First release from Netscape
* 1997 DHTML with Internet Explorer 4
* 2004 Gmail deployed using Ajax
* 2005 Joomla released
* 2006 jQuery & XMLHttpRequest object W3C draft spec released
* 2008 Joomla 1.5
* 2009 JavaScript ES5
* 2010 Angular.js
* *20012 Joomla 2.5 & Joomla 3*
* 2013 React.js
* 2014 Flux
* 2015 Redux & JavaScript ES6
</script>
</section>
<section data-markdown>
<script type="text/template">
## Joomla and JavaScript
* Joomla 1.x the wild west of JavaScript<!-- .element: class="fragment" data-fragment-index="2" -->
* Joomla 1.5 => 2.5 and Mootools<!-- .element: class="fragment" data-fragment-index="3" -->
* Joomla 3+ and jQuery / Bootstrap2<!-- .element: class="fragment" data-fragment-index="4" -->
* Joomla 4+ and jQuery / Bootstrap4?<!-- .element: class="fragment" data-fragment-index="5" -->
</script>
</section>
<section data-markdown>
</section>
<section data-markdown>
<script type="text/template">
### So what does a JavaScript heavy project look like anyway?
* Fabrik<!-- .element: class="fragment" data-fragment-index="1" -->
* 26.5% JavaScript<!-- .element: class="fragment" data-fragment-index="2" -->
* 612 files<!-- .element: class="fragment" data-fragment-index="3" -->
* 372 000 lines of code<!-- .element: class="fragment" data-fragment-index="4" -->
</script>
</section>
<section data-markdown data-background="#ff0000" data-background-transition="fade">
<script type="text/template">
</script>
</section>
<section data-markdown>
<script type="text/template">
## Potential issues...
* Multiple versions of libraries loaded (jQuery, requireJs)
* jQuery not in no-conflict-mode
* AJAX calls can potentially load a new version of jQuery
* Templates do their own thing UIKit, Bootstrap3, Bootstrap4 etc
* Rewriting code to keep up with latest libraries, or load multiple libraries
</script>
</section>
<section data-markdown data-background-transition="convex">
<script type="text/template">
### So how do I feel as a Joomla & JavaScript developer?
 <!-- .element: class="fragment" data-fragment-index="1" -->
</script>
</section>
<section data-markdown data-background="#7E904C" >
<script type="text/template">
</script>
</section>
<section data-markdown>
<script type="text/template">
## What might we be missing?
* Dependency management<!-- .element: class="fragment" data-fragment-index="1" -->
* Declarative "data first" approach<!-- .element: class="fragment" data-fragment-index="2" -->
* Cross component/module communication<!-- .element: class="fragment" data-fragment-index="3" -->
* View layers separated from the data layer<!-- .element: class="fragment" data-fragment-index="4" -->
</script>
</section>
<section data-markdown>
<script type="text/template">
## Dependency management
- **AMD**
- Asynchronous Module Definition
- **CommonJS**
- **ES6 Modules**
- requires ES6 => ES5 compilation
</script>
</section>
<section>
<h2>Data first approach - Immutable</h2>
<blockquote class="fragment" data-fragment-index="1" >The last thing you wanted any programmer to do is
<strong>mess with internal state</strong> even if presented figuratively
<cite>Alan Kay - creator of Smalltalk</cite></blockquote>
</section>
<section>
<h3>Mutable objects</h3>
<pre><code data-trim data-noescape class="js">
var map1 = {a:1, b:2, c:3};
var map2 = map1;
map2.b = 2;
assert(map1.equals(map2) === true);
var map3 = map1;
map3.b = 50;
assert(map1.equals(map3) === true);
</code></pre>
<div class="fragment" data-fragment-index="1">
<h3>Immutable objects</h3>
<pre><code data-trim data-noescape>
var map1 = Immutable.Map({a:1, b:2, c:3});
var map2 = map1.set('b', 2);
assert(map1.equals(map2) === true);
var map3 = map1.set('b', 50);
assert(map1.equals(map3) === false);
</code></pre>
</div>
</section>
<section>
<h3>Data first approach - Redux</h3>
<img src="images/redux.jpg#half" />
<ul style="display: inline;
width: 43%;
float: right;">
<li class="fragment" data-fragment-index="1">The user triggers actions</li>
<li class="fragment" data-fragment-index="2">Optional middle ware is run, e.g. logging</li>
<li class="fragment" data-fragment-index="3">A series of reducers return new instances of the stores state</li>
<li class="fragment" data-fragment-index="4">Reducers are pure functions</li>
<li class="fragment" data-fragment-index="5">View provider rendered on state change</li>
</ul>
</section>
<section data-markdown>
<script type="text/template">
## Whisper
https://github.com/Fabrik/whisper
- Small system plugin 14kb Js
- Implements Redux, exposing 4 methods
- addReducer()<!-- .element: class="fragment" data-fragment-index="1" -->
- dispatch()<!-- .element: class="fragment" data-fragment-index="2" -->
- getState()<!-- .element: class="fragment" data-fragment-index="3" -->
- subscribe()<!-- .element: class="fragment" data-fragment-index="4" -->
- Available to any components/module via<!-- .element: class="fragment" data-fragment-index="5" -->
- Joomla.whisper.trigger('whisper.method', args)<!-- .element: class="fragment" data-fragment-index="5" -->
</script>
</section>
<section data-markdown>
## Cross component communication
</section>
<section>
<h3>Dispatch an Action</h3>
<pre><code>
addButton
.addEventListener('click', function () {
// Our action we want to dispatch
var action = {
type: 'COM_TODO.ADD',
text: input.value
}
$w.trigger('whisper.dispatch', {action: action})
});</code></pre>
</section>
<section>
<h3>Reducer run</h3>
<pre><code class="js">
var reducer = function (state = {todos: []}, action) {
var helper = $w.reducerHelper;
if (!action || !action.type) {
return state;
}
switch (action.type) {
case 'COM_TODO.ADD':
var todo = {
id : new Date().getTime(),
text : action.text
};
return Object.assign({}, state, {
todos: helper.add(state.todos, todo)
});
default:
return state
}
};
$w.trigger('whisper.addReducer', {name: 'com_todo', reducer: reducer});
</code></pre>
</section>
<section>
<h3>View updated</h3>
<pre><code>
var render = function () {
$w.trigger('whisper.getState', function (state) {
var i, li,
todos = state.com_todo.todos;
// Clear out the list
list.innerHTML = '';
// Loop over the todos and add each item
for (i = 0; i < todos.length; i++) {
li = document.createElement('li');
li.setAttribute('data-id', todos[i].id);
li.innerHTML = todos[i].text;
list.appendChild(li);
}
// Reset the input to ''
input.value = '';
})
}
// Update the page with the state
render();
// Subscribe to state changes
// each time the state is changed render() is run
$w.trigger('whisper.subscribe', render);
</code></pre>
</section>
<section>
<h3>Module - observe state changes</h3>
<pre><code class="js">
(function ($w) {
$w.ready(function () {
//Update the UI based on the current state
var render = function () {
$w.trigger('whisper.getState', function (state) {
var valueEl = document.querySelector('*[data-total-todos]');
valueEl.innerHTML = state.com_todo.todos.length.toString();
})
};
render(); // Initial render
$w.trigger('whisper.subscribe', render) // Subscribe to state changes
})
})(Joomla.whisper);
</code></pre>
</section>
<section>
<h3>Whisper.js</h3>
<pre><code>/*jslint esversion: 6 */
// Import the required modules
import {createStore} from 'redux';
import {configureStore, injectAsyncReducer} from './store';
// Create a Redux store holding the state of your app.
let store = configureStore({});
/**
* Add a reducer function to the whisper framework
* Reducers respond to actions and update the application's state.
* @param {event} event
*/
const addReducer = (event) => {
const d = event.detail;
injectAsyncReducer(store, d.name, d.reducer);
// Optional function that can be run once the
// reducer has been added to Whisper
if (d.onAdd !== undefined) {
d.onAdd();
}
};
/**
* Dispatch an action to the store
* Actions are payloads of information that send data from your
* application to Whisper's store.
* They are the only source of information for the store
* @param {event} event
*/
const dispatch = (event) => {
const d = event.detail;
store.dispatch(d.action);
};
/**
* Get the current state
* @param {event} event
* @returns {S}
*/
const getState = (event) => {
// d will be the callback function that was passed in the event
const d = event.detail;
return d(store.getState());
};
/**
* Subscribe a function which is run when the store's state
* changes. This function handles updating the view
* @param {event} event
*/
const subscribe = (event) => {
const d = event.detail;
store.subscribe(d);
};
// Watch for any custom events (fired by components/modules etc)
document.addEventListener('whisper.addReducer', addReducer);
document.addEventListener('whisper.dispatch', dispatch);
document.addEventListener('whisper.getState', getState);
document.addEventListener('whisper.subscribe', subscribe);
</code></pre>
</section>
<section>
<h3>Gulp build script</h3>
<pre><code>var gulp = require('gulp'),
browserify = require('browserify'),
babelify = require('babelify'),
source = require('vinyl-source-stream'),
uglify = require('gulp-uglify'),
buffer = require('vinyl-buffer');
gulp.task('watch', function () {
gulp.watch('./src/*.js', ['dist']);
});
/**
* First runs scripts and then browserifies
* them and converts them from es6 to es2015 js code
*/
gulp.task('dist', function () {
process.env.NODE_ENV = 'production';
browserify(
{
entries : './src/app.js',
extensions: ['.js'],
debug : true
}
)
.transform(babelify, {presets: ['es2015', 'stage-2']})
.bundle()
.pipe(source('whisper.js'))
.pipe(buffer())
.pipe(uglify())
.pipe(gulp.dest('./'));
});
gulp.task('default', ['dist'], function () {
});</code></pre>
</section>
<section>
<h3>What would all that actually look like?</h3>
<embed src="images/2016-05-18_1555.swf" style="width:100%;height: 100%"></embed>
</section>
<section data-markdown>
<script type="text/template">
</script>
</section>
<section data-markdown>
## What next?
- Aysnc actions to query database
- IndexDb support for hot-loading application state
- Use selectors to compute derived data
- Core component reducers
</section>
<section data-markdown>
## Summary
- Whisper.js - small js library to manage one way data flow
- Sample code for component/module communication
- Opt-in, and hands off view rendering to component
</section>
<section data-markdown>
## Thanks! Any questions??
- https://github.com/Fabrik/whisper
- https://github.com/Fabrik/joomla-and-beyond-2016
- https://github.com/reactjs/redux
- https://egghead.io/series/getting-started-with-redux
</section>
</div>
</div>
<script src="js/reveal.js"></script>
<script src="plugin/markdown/marked.js"></script>
<script src="plugin/markdown/markdown.js"></script>
<script src="plugin/highlight/highlight.js"></script>
<script src="lib/js/head.min.js"></script>
<script>
Reveal.initialize({
history : true,
dependencies: [
// Syntax highlight for <code> elements
{
src: 'plugin/highlight/highlight.js', async: true, callback: function () {
hljs.initHighlightingOnLoad();
}
}
]
});
</script>
</body>
</html>