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A future called Web Components

Zeno Rocha
December 17, 2013

A future called Web Components

HTML5 LA

Zeno Rocha

December 17, 2013
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  1. View Slide

  2. I’m from Brazil!

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  10. the most famous
    client-side
    projects
    are fated
    to die

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  14. so you think
    everything will
    become “native"
    one day?

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  15. what the
    major web
    companies
    have been
    working on?

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  29. how do you
    create a

    “component”
    nowadays?

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  30. 1. Never create! Just use a jQuery plugin

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  31. 2. Copy and paste someone’s code

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  32. 3. And hope it works

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  35. eduardolundgren.github.io/video-camera-element

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  38. attributes="where">
    // content goes here


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  39. // content goes here

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  41. using JS

    var proto = Object.create(HTMLElement.prototype);
    proto.createdCallback = function() {
    this.textContent = ‘HTML5 LA!';
    };

    document.register(‘html5-la', {
    prototype: proto
    });

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  42. lifecycle
    • createdCallback()
    • enteredDocumentCallback()
    • leftDocumentCallback()
    • attributeChangedCallback()

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  45. how to use it?

    <br/>Polymer(‘html5-la', {<br/>where: ‘Santa Monica’,<br/>created: function() {<br/>// do something <br/> <br/> <br/> <br/> <br/> }<br/>}); <br/> <br/> <br/> <br/>

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  46. lifecycle
    • created()
    • enteredView()
    • leftView()
    • attributeChanged()

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  48. Templates
    are reusable
    blocks of
    code

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  49. Templates
    are reusable
    blocks of
    code

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  52. attempt #1



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  53. <br/><img src="logo.png"><br/>
    attempt #2

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  55. how to create it?



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  56. how to use it?
    // 1. Access template’s content

    var t = document.querySelector('#myTemplate').content;
    // 2. Manipulate internal element
    t.querySelector('img').src = 'logo.png';
    // 3. Clone and append in the DOM
    document.body.appendChild(t.cloneNode(true));

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  58. Shadow DOM
    hides the
    implementation
    details

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  59. what about
    ?

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  60. what’s a


    made of?
    or password, textarea, date?

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  61. how to use it?
    Foo

    var elem = document.querySelector(‘#elem');
    var elemShadowDOM = elem.createShadowRoot();
    !
    elemShadowDOM.innerHTML = 'Bar';

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  62. markup, style &
    script encapsulated
    Foo

    var elem = document.querySelector(‘#elem');
    var elemShadowDOM = elem.createShadowRoot();
    !
    elemShadowDOM.innerHTML = ‘Bar’ +
    ‘h1 { color: red; }’;

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  66. how to use it?

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  71. where can I

    find them?
    NPM? Bower?

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  75. zenorocha.github.io/twitter-button

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  76. eduardolundgren.github.io/google-maps-element

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  77. eduardolundgren.github.io/video-camera-element

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  78. eduardolundgren.github.io/video-tracking-element

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  79. in other words…

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  80. encapsulation
    and code reuse
    for real

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  81. the best
    way to
    predict the
    future is
    to create it

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  83. thanks!
    zenorocha.com

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