An app in 3 days or: how I learned to stop worrying and love the Polymer toolbox

Think of your favourite app. It's probably meowni.ca/emojillate (who can blame you), but if it isn't (and we need to talk) it probably has one, if not all, of these things: a database; a potential for disaster, with many users looking at and clicking on the same data; offline support, and a responsive layout. While preferably being faster than the average bear. Recreating this from scratch might sound like a terrifying experience, but I'm going to show you how the polymer toolbox and a few other already-built elements can help you go from zero to hero and build a PWA in no time.

Video: (Polymer Summit): https://www.youtube.com/watch?v=6t2JRKTCYbI&list=PLNYkxOF6rcICc687SxHQRuo9TVNOJelSZ&index=26

Transcript

1. 3 DAYS
   A N A P P I N
   ( M O R E O R L E S S )
   

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2. @NOTWALDORF
   

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3. I’VE NEVER BUILT
   O K . R E A L TA L K
   AN APP
   

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4. IT’S GOT USERS THAT
   NEED AUTHENTICATION

   DATA IN IN THE
   RESPONSIVE UI OFFLINE
   ROUTES LANGUAGES
   

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5. IT’S GOT USERS THAT
   NEED AUTHENTICATION

   DATA IN IN THE
   RESPONSIVE UI OFFLINE
   ROUTES LANGUAGES
   

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6. IT’S GOT USERS THAT
   NEED AUTHENTICATION

   DATA IN THE
   RESPONSIVE UI OFFLINE
   ROUTES LANGUAGES
   

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7. IT’S GOT USERS THAT
   NEED AUTHENTICATION

   DATA IN THE
   OFFLINE RESPONSIVE UI
   ROUTES LANGUAGES
   

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8. IT’S GOT USERS THAT
   NEED AUTHENTICATION

   DATA IN THE
   OFFLINE RESPONSIVE UI
   ROUTES LANGUAGES
   

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9. IT’S GOT USERS THAT
   NEED AUTHENTICATION

   DATA IN THE
   OFFLINE RESPONSIVE UI
   ROUTES LANGUAGES
   

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10. IT’S GOT USERS THAT
    NEED AUTHENTICATION

    DATA IN THE
    OFFLINE RESPONSIVE UI
    ROUTES LANGUAGES
    

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11. SO LET’S BUILD
    THIS APP
    

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12. HTTPS://MOJIBRAG.FIREBASEAPP.COM
    

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13. DO LESS / BE LAZY
    B U T F O R L I K E , E V E RY T H I N G
    1
    

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14. (´ ̙ҹ).牐ӈὑ ~/Code ❥ mkdir app && cd app
    (´ ̙ҹ).牐ӈὑ ~/Code/app ❥ polymer init starter-kit
    

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17. localhost:8000/view2
    

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18. localhost:8000/view3
    

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21. AUTHENTICATION
    2
    

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22. USE FIREBASE
    W H E N I N D O U B T
    

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23. api-key=“…”
    database-url=“https://your-app.firebaseio.com"
    auth-domain=“your-app.firebaseapp.com"
    storage-bucket=“your-app.appspot.com”>
    
    user="{{user}}" provider=“google”>
    
    

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24. api-key=“…”
    database-url=“https://your-app.firebaseio.com"
    auth-domain=“your-app.firebaseapp.com"
    storage-bucket=“your-app.appspot.com”>
    
    user="{{user}}" provider=“google”>
    
    

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25. login: function() {
    this.$.auth.signInWithPopup();
    },
    logout: function() {
    this.$.auth.signOut();
    },
    attached: function() {
    firebase.auth().onAuthStateChanged(function(user){
    // you have a user!
    }
    }
    

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26. login: function() {
    this.$.auth.signInWithPopup();
    },
    logout: function() {
    this.$.auth.signOut();
    },
    attached: function() {
    firebase.auth().onAuthStateChanged(function(user){
    // you have a user!
    }
    }
    

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27. login: function() {
    this.$.auth.signInWithPopup();
    },
    logout: function() {
    this.$.auth.signOut();
    },
    attached: function() {
    this.$.auth.auth.onAuthStateChanged(function(user){
    // you have a user!
    }
    }
    

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28. “THE CLOUD”
    3
    

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29. JUST USE FIREBASE
    S E R I O U S LY.
    

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30. data="{{_fbPosts}}"
    path="/posts/{{ref}}">
    
    session="[[uid]]"
    key="/posts/{{ref}}"
    data="[[_fbPosts]]"
    persisted-data="{{posts}}">
    
    

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31. 
    

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32. 
    
    

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33. 
    
    

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34. path=“/posts/{{channelName}}“
    data="{{_liveData}}">
    
    session="[[uid]]"
    key="/posts/{{teamName}}"
    data="[[_fbPosts]]"
    persisted-data="{{posts}}">
    
    

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35. path=“/posts/{{channelName}}“
    data="{{_liveData}}">
    
    session=“[[user.uid]]”
    key="/posts/{{channelName}}"
    data="[[_fbPosts]]"
    persisted-data="{{posts}}">
    
    

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36. path=“/posts/{{channelName}}“
    data="{{_liveData}}">
    
    session=“[[user.uid]]"
    key="/posts/{{channelName}}"
    data="[[_liveData]]"
    persisted-data="{{posts}}">
    
    

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37. path=“/posts/{{channelName}}“
    data="{{_liveData}}">
    
    session=“[[user.uid]]"
    key="/posts/{{channelName}}"
    data="[[_liveData]]"
    persisted-data="{{posts}}">
    
    

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41. PUTTING IT
    TOGETHER
    V I E W S ’ N ’ D ATA
    4
    

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42. FEATURES
    T H I N K I N G A B O U T
    

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43. T R A N S L AT E S T O W E B C O M P O N E N T S
    FEATURES
    T H I N K I N G A B O U T
    

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48. 
    ✨
    

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50. 
    

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51. 
    

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52. 
    
    

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53. 
    
    
    

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54. 
    
    
    

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55. 
    
    
    
    

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56. PROPERTIES DOWN
    D ATA F L O W
    EVENTS UP
    

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57. 
    
    

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59. ACTIVE
    CHANNEL
    

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60. ACTIVE
    CHANNEL
    EVENT:
    POST !
    

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61. OFFLINE:
    FALSE
    EVENT:
    POST !
    

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62. OFFLINE:
    FALSE
    EVENT:
    POST !
    THIS.$.POST.HIDDEN
    

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63. WORK OFFLINE?
    B U T D O E S I T
    5
    

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64. SERVICE WORKER
    A L R E A DY D O N E
    

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65. CONDITIONAL UI
    Y O U M I G H T WA N T
    

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66. ready: function() {
    this.offline = navigator.onLine === false;
    window.addEventListener('online', function() {
    this.offline = false;
    }.bind(this));
    window.addEventListener('offline', function() {
    this.offline = true;
    }.bind(this));
    },
    

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67. ready: function() {
    this.offline = navigator.onLine === false;
    window.addEventListener('online', function() {
    this.offline = false;
    }.bind(this));
    window.addEventListener('offline', function() {
    this.offline = true;
    }.bind(this));
    },
    

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68. ready: function() {
    this.offline = navigator.onLine === false;
    window.addEventListener('online', function() {
    this.offline = false;
    }.bind(this));
    window.addEventListener('offline', function() {
    this.offline = true;
    }.bind(this));
    },
    

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69. ready: function() {
    this.offline = navigator.onLine === false;
    window.addEventListener('online', function() {
    this.offline = false;
    }.bind(this));
    window.addEventListener('offline', function() {
    this.offline = true;
    }.bind(this));
    },
    

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70. 
    Sign in
    
    

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73. M
    AKE IT
    FAST
    6
    

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74. D O L E S S . B E L A Z Y
    IRON-LIST
    

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75. IF YOU DON’T NEED IT
    DON’T IMPORT IT
    D O L E S S . B E L A Z Y
    

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76. importHref(
    fileName,
    successCallback,
    errorCallback)
    

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77. 
    
    
    
    
    

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78. 
    
    
    
    
    firebase.auth().onAuthStateChanged(function(user) {
    if (user) {
    this.importHref(‘humble-brag.html', function() {
    this.hideSigninUI();
    this.showMainApp();
    }, null, true);
    }
    }
    

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79. 
    
    
    
    
    firebase.auth().onAuthStateChanged(function(user) {
    if (user) {
    this.importHref(‘moji-feed.html’, function() {
    this.hideSigninUI();
    this.showMainApp();
    }, null, true);
    }
    }
    

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80. 
    
    
    
    
    firebase.auth().onAuthStateChanged(function(user) {
    if (user) {
    this.importHref(‘moji-feed.html’, function() {
    this.hideSigninUI();
    this.showMainApp();
    }, null, true);
    }
    }
    

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85. LIGHTHOUSE
    I S R E A A A A L LY AW E S O M E
    

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87. HOW PAUL LEWIS
    S T O RY T I M E
    RUINED MY DAY
    

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89. FAKE IT
    P R O T I P
    YOU MAKE IT
    W H I L E
    

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90. 
    
    
    Hi there!
    Loading..
    
    
    
    

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91. 
    
    
    Hi there!
    Loading..
    
    
    
    

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93. BEFORE CHANGE WITH CHANGE
    

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94. C’EST FACILE!
    I N T E R N AT I O N A L I Z AT I O N
    7
    

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95. 
    Sign out
    
    

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96. 
    [[localize(‘sign-out’)]]
    
    

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97. locales.json:
    {
    “en”: { “sign-out”: “Sign out” },
    “fr”: { “sign-out”: “Déconnexion” },
    “zh”: { “sign-out”: “蝐ڊ” }
    }
    

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98. locales.json:
    {
    “en”: { “sign-out”: “Sign out” },
    “fr”: { “sign-out”: “Déconnexion” },
    “zh”: { “sign-out”: “蝐ڊ” }
    }
    Polymer({
    behaviors: [Polymer.AppLocalizeBehavior],
    ready: {
    this.language = ‘en’;
    this.loadResources(‘locales.json’);
    }
    });
    

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99. locales.json:
    {
    “en”: { “sign-out”: “Sign out” },
    “fr”: { “sign-out”: “Déconnexion” },
    “zh”: { “sign-out”: “蝐ڊ” }
    }
    Polymer({
    behaviors: [Polymer.AppLocalizeBehavior],
    ready: {
    this.language = ‘en’;
    this.loadResources(‘locales.json’);
    }
    });
    

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100. locales.json:
     {
     “en”: { “sign-out”: “Sign out” },
     “fr”: { “sign-out”: “Déconnexion” },
     “zh”: { “sign-out”: “蝐ڊ” }
     }
     Polymer({
     behaviors: [Polymer.AppLocalizeBehavior],
     ready: {
     this.language = ‘en’;
     this.loadResources(‘locales.json’);
     }
     });
     

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101. locales.json:
     {
     “en”: { “sign-out”: “Sign out” },
     “fr”: { “sign-out”: “Déconnexion” },
     “zh”: { “sign-out”: “蝐ڊ” }
     }
     Polymer({
     behaviors: [Polymer.AppLocalizeBehavior],
     ready: {
     this.language = ‘en’;
     this.loadResources(‘locales.json’);
     }
     });
     

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105. ALL TOGETHER NOW
     

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106. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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107. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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108. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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109. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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110. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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111. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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112. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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113. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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114. POLYMER CLI APP-LAYOUT
     SERVICE-WORKER POLYFIRE
     PROPERTIES ⇣ EVENTS ⇡
     NAVIGATOR.ONLINE
     IRON-LIST LAZY LOADING
     APP-LOCALIZE-BEHAVIOUR
     

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115. @NOTWALDORF
     NOUN PROJECT ICONS: JAIME CARRION, RFLOR, STOCK IMAGE FOLIO, BERNAR NOVALYI
     h t t p s : // m o j i b r a g . f i r e b a s e a p p . c o m
     

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