Practical guide for front-end development for Django Devs

Good tips for front-end development for Django Apps

Transcript

1. davidson fellipe front-end engineer at globo.com PRACTICAL GUIDE FOR FRONT-END DEVELOPMENT FOR DJANGO DEVS
2. - HTML ~ 2001 - front-end engineer - globo.com ~ 2010 - more about me at fellipe.com me
3. globo.com - 35 multidisciplinary teams using agile methodologies - large open source community - projects at opensource.globo.com
4. globo.com - 3 multidisciplinary teams - all engineers code for client side sports at globo.com
5. https://www.!ickr.com/photos/frontendbr/1691161875/sizes/o/ WHY FRONT-END?
6. 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
7. USER EXPERIENCE OPTIMIZED
8. 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?
9. CODE NEEDS TO WORK IN DIFFERENT ENVIRONMENTS
10. MULTIPLE BROWSERS MULTIPLE VERSIONS MULTIPLE RESOLUTIONS MULTIPLE DEVICES
11. 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...
12. http://i1-news.softpedia-static.com/images/news2/Three-of-the-Windows-Users-Fears-and-Misconceptions-About-Linux-427770-2.jpg
13. http://i1-news.softpedia-static.com/images/news2/Three-of-the-Windows-Users-Fears-and-Misconceptions-About-Linux-427770-2.jpg
14. IT’S MUCH MORE THAN CONVERT JPG TO HTML
16. http:globoesporte.com
17. - 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?
18. + combining elements
20. MAKE APPS!
21. 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
23. our requirements - DRY - components - fonts and icons - similar interactions across site - possibility of themes - low speci"city of CSS
24. thinking in components <header class="geui-title"> <h1 class="geui-title-label"> Normal <span class="geui-title-bold">Bold</span> </h1> <a href="#" class="geui-title-more geui-color-default">read more</a> <span class="geui-title-bar geui-color-default"></span> </header> HTML
25. 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
26. how blocks work? {% extends "core/delivery.html" %} {% block css_delivery %} {{ block.super }} <link type="text/css" rel="stylesheet" media="screen" href="poll/css/delivery.css"> {% endblock %} delivery.html TEMPLATE app core TEMPLATE app poll
27. DO MORE TEMPLATE TAGS
28. 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)
29. dropdown.html <div class="geui-dropdown"> <span class="geui-dropdown-title">{{dropdown.title}}</span> <ul class="geui-dropdown-list"> {% for item in dropdown.itens %} <li class="geui-dropdown-list-item"> <a href="{{item.link}}" class="geui-dropdown-list-link" title="{{item.label}}" {% for meta in item.meta %} data-{{meta.label}}="{{meta.valor}}" {% endfor %}>{{item.label}}</a> </li> {% endfor %} </ul> </div> iterations
30. DO YOU WANT TO CREATE A UI LIB? NO, I DON’T!
33. CSS VS PREPROCESSORS
34. good parts - improve productivity - easy to work with modules - use of mixins, variables, selector inheritance and nesting
39. BAD PRACTICES WITH CSS, CAN BE MADE
40. doing evil with scss! .great-grandfather { .grandfather { .father { #wtf { color: #f60; } } } } .great-grandfather .grandfather .father #wtf { color: #f60; } /* why high specificity id? */ SCSS CSS
41. AUTOMATING TASKS
42. let’s use Grunt?
43. grunt.js - low learning curve - large number of plugins - huge open source community
44. I’ve got to con"gure node.js?
45. $ 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
46. tasks - test runners - preprocessors - js / css lint - create sprites - concatenation
47. 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
48. 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
49. LET'S CREATE A CODING STANDARD?
50. standards - quotes, braces, semicolons - Space vs Tab - Single quote vs double quotes - nomenclatures for functions, Object Literal, conditional statement...
51. https://github.com/rwaldron/idiomatic.js/
52. https://github.com/airbnb/javascript
53. http://csslint.net/
54. PERFORMANCE
55. #everybodyloves
56. http://www.broofa.com/Tools/JSLitmus/
57. http://pitomba.org/
58. https://github.com/django-compressor/django-compressor
59. https://github.com/davidsonfellipe/keepfast/
60. http://browserdiet.com/
61. What impact performance? - low conversions - low engagement - high rejection rates
62. - fellipe.com/talks - github.com/davidsonfellipe - twitter.com/davidsonfellipe thankyou