Practical guide for front-end development for Django Devs

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

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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

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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
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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!
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33. CSS VS PREPROCESSORS

34. good parts - improve productivity - easy to work with

    modules - use of mixins, variables, selector inheritance and nesting
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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