Building large JS apps - Speaker Deck

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@maccman May 2012

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I am @maccman (not @mccman)

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I like CoffeeScript

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Building hardware

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Redundancy means decoupled components

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This talk isn’t really about Spine

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...or about Backbone

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It’s about mega.js

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Or base.js

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Or everythingbutthekitchensink.js

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Its about structure and building large apps

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CommonJS?

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1. Exposing properties

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2. Requiring modules

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module.exports = User; require('user');

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If you’re not using a module system, like CommonJS, you’re doing it wrong

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sprockets-commonjs

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program.module.js

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module.exports = function(){ alert('Long live the Programs!'); };

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this.require.define({"modules/program": function(exports, require, module){ module.exports = function(){ alert('Long live the Programs!'); }; }});

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this.require.define({"modules/program": function (exports, require, module) { module.exports = function () { alert('Long live the Programs!') } }})

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Program = require('modules/program')

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sprockets-source-url

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eval("..." + "\n//@ sourceURL=/application");

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Stylo

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styloapp.com

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github.com/maccman/stylo

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“The secret to building large apps is never build large apps. Break your app into small pieces. Then, assemble those testable, bite- sized pieces into your big application.” - Justin Meyer

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H e a d e r Stage Element Element Dimensions Background Border Border Radius Shadow Opacity Inspector

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Abstract components

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Treat them like open source libraries

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Color Picker Position Picker Context Menu

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Decoupled controllers

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Rules

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1. Controllers can be instantiated multiple times without adverse effects

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2. Controllers work without being attached to the DOM

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Initially stored state in the DOM

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Store state in the controllers, not the models, not the view

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Styles

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No IDs

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Separate stylesheets for each controller

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Clear over DRY

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#app .inspector .background { .edit { margin: 10px } .gradientPicker { margin: 0px 5px 5px 5px } &.disabled { .list { opacity: 0.6 } } }

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Module communication

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Expose a simple API and use events

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// Private

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PubSub

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// color_picker.js this.trigger('change');

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// background.js var colorPicker = new ColorPicker; colorPicker.bind('change', function(color){ // ... }); this.append(colorPicker);

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Children should’t know anything about their parents

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What I learnt

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Use the tools

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Awesome debugger

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Shortcuts

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Memory leaks

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display: none;

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Less DOM manipulation

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mousemove handlers need to be fast

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requestAnimationFrame()

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