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davidson fellipe front-end engineer at globo.com PRACTICAL GUIDE FOR FRONT-END DEVELOPMENT FOR DJANGO DEVS

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- HTML ~ 2001 - front-end engineer - globo.com ~ 2010 - more about me at fellipe.com me

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globo.com - 35 multidisciplinary teams using agile methodologies - large open source community - projects at opensource.globo.com

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globo.com - 3 multidisciplinary teams - all engineers code for client side sports at globo.com

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https://www.!ickr.com/photos/frontendbr/1691161875/sizes/o/ WHY FRONT-END?

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94% of load time is related to client side (globoesporte.com/copa) http://gtmetrix.com/har.html?inputUrl=http://gtmetrix.com/reports/globoesporte.globo.com/7eqNM2Z1/net.harp&expand=true&validate=false

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USER EXPERIENCE OPTIMIZED

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http://www.reddit.com/r/javascript/comments/14zwpv/why_are_front_end_developers_so_high_in_demand_at/ WHY ARE FRONT END DEVELOPERS SO HIGH IN DEMAND AT STARTUPS IF FRONT END DEVELOPMENT IS RELATIVELY EASIER THAN OTHER FIELDS OF ENGINEERING?

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CODE NEEDS TO WORK IN DIFFERENT ENVIRONMENTS

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MULTIPLE BROWSERS MULTIPLE VERSIONS MULTIPLE RESOLUTIONS MULTIPLE DEVICES

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HTML, CSS, JAVASCRIPT, FEATURE DETECTION, REPAINT, REFLOW, PRE-PROCESSORS, HTTP, CSRF, ANIMATIONS TIME FUNCTIONS, SVG, CANVAS, LOCALSTORAGE, WEBCOMPONENTS, XSS, WEBSOCKETS, SHADOW DOM, GRIDS SYSTEMS, SCHEMA.ORG, SEO... AND WHY NOT? DEPENDENCY MANAGEMENT, MVC FRAMEWORKS, TESTING, CODE QUALITY ANALYZERS, TASK RUNNERS, PERFORMANCE...

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http://i1-news.softpedia-static.com/images/news2/Three-of-the-Windows-Users-Fears-and-Misconceptions-About-Linux-427770-2.jpg

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http://i1-news.softpedia-static.com/images/news2/Three-of-the-Windows-Users-Fears-and-Misconceptions-About-Linux-427770-2.jpg

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IT’S MUCH MORE THAN CONVERT JPG TO HTML

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http:globoesporte.com

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- how load the shields? - how to create this tabs? - what happens when a team is loaded? - how to request a new soccer team? - where to use WAI-ARIA?

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+ combining elements

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MAKE APPS!

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app example - division of responsibilities - unit tests for each app - management and setup of dependencies using pypi - is difficult to separate when the apps are already in production together app product core app news app polls requirements.txt

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our requirements - DRY - components - fonts and icons - similar interactions across site - possibility of themes - low speci"city of CSS

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thinking in components

Normal Bold

read more HTML

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organizing your app (ge)davidson ➜ .../ge_ui/static (master) $ tree |-fonts |---icons |---opensans |-img |---ge_ui |-----placeholder |-----sprites |-js |---ge_ui |---vendor |-scss |---ge_ui |---vendor TERMINAL

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how blocks work? {% extends "core/delivery.html" %} {% block css_delivery %} {{ block.super }} {% endblock %} delivery.html TEMPLATE app core TEMPLATE app poll

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DO MORE TEMPLATE TAGS

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template tag # -*- coding: utf-8 -*- from django.template import Library register = Library() @register.inclusion_tag('components/dropdown.html') def ge_ui_dropdown(dropdown): return {'dropdown': dropdown} ge_ui_dropdown.is_safe = True register.filter(ge_ui_dropdown)

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dropdown.html
{{dropdown.title}}
    {% for item in dropdown.itens %}
  • {{item.label}}
    • {% endfor %}
iterations

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DO YOU WANT TO CREATE A UI LIB? NO, I DON’T!

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CSS VS PREPROCESSORS

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good parts - improve productivity - easy to work with modules - use of mixins, variables, selector inheritance and nesting

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BAD PRACTICES WITH CSS, CAN BE MADE

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doing evil with scss! .great-grandfather { .grandfather { .father { #wtf { color: #f60; } } } } .great-grandfather .grandfather .father #wtf { color: #f60; } /* why high specificity id? */ SCSS CSS

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AUTOMATING TASKS

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let’s use Grunt?

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grunt.js - low learning curve - large number of plugins - huge open source community

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I’ve got to con"gure node.js?

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$ make grunt-con"g grunt-config: @if [ ! $$(which node) ]; then echo "✖ installing node..."; brew install node; else echo "node ✔"; fi @if [ ! $$(which npm) ]; then echo '✖ installing npm...'; sudo curl https://npmjs.org/install.sh -k | sh; else echo "npm ✔"; fi @if [ ! $$(which grunt) ]; then echo '✖ installing grunt...'; sudo npm install -g grunt-cli; else echo "grunt ✔"; fi @sudo npm i --save-dev MAKEFILE grunt-config: @if [ ! $$(which node) ]; then echo "✖ installing node..."; brew install node; else echo "node ✔"; fi @if [ ! $$(which npm) ]; then echo '✖ installing npm...'; sudo curl https://npmjs.org/install.sh -k | sh; else echo "npm ✔"; fi @if [ ! $$(which grunt) ]; then echo '✖ installing grunt...'; sudo npm install -g grunt-cli; else echo "grunt ✔"; fi @sudo npm i --save-dev MAKE

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tasks - test runners - preprocessors - js / css lint - create sprites - concatenation

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package .json { "name": "poll", "version": "0.0.1", "devDependencies": { "grunt": "~0.4.2", "grunt-contrib-jshint": "~0.6.5", "grunt-contrib-uglify": "~0.2.7", "grunt-contrib-watch": "~0.5.3", "load-grunt-tasks": "~0.2.0", "grunt-contrib-compass": "~0.6.0", "grunt-contrib-concat": "~0.3.0", "grunt-contrib-clean": "~0.5.0", "grunt-contrib-copy": "~0.4.1", "grunt-shell": "~0.6.1" } } JS

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Grunt"le .js module.exports = function(grunt) { grunt.initConfig({ pkg: grunt.file .readJSON('package.json'), pathBase: 'poll/static/poll/', pathSrc: '<%= pathBase %>src/', pathBuild: '<%= pathBase %>build/', compass: {}, uglify: {}, clean: {}, concat: {}, copy: {}, shell: {} }); require('load-grunt-tasks')(grunt); grunt.registerTask('build', ['compass:min','concat','clean','copy', 'uglify','shell']); }; JS

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LET'S CREATE A CODING STANDARD?

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standards - quotes, braces, semicolons - Space vs Tab - Single quote vs double quotes - nomenclatures for functions, Object Literal, conditional statement...

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https://github.com/rwaldron/idiomatic.js/

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https://github.com/airbnb/javascript

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http://csslint.net/

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PERFORMANCE

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#everybodyloves

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http://www.broofa.com/Tools/JSLitmus/

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http://pitomba.org/

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https://github.com/django-compressor/django-compressor

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https://github.com/davidsonfellipe/keepfast/

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http://browserdiet.com/

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What impact performance? - low conversions - low engagement - high rejection rates

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- fellipe.com/talks - github.com/davidsonfellipe - twitter.com/davidsonfellipe thankyou