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I’m from Brazil!
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the most famous
client-side
projects
are fated
to die
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so you think
everything will
become “native"
one day?
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what the
major web
companies
have been
working on?
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how do you
create a
“component”
nowadays?
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1. Never create! Just use a jQuery plugin
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2. Copy and paste someone’s code
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3. And hope it works
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eduardolundgren.github.io/video-camera-element
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// content goes here
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// content goes here
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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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lifecycle
• createdCallback()
• enteredDocumentCallback()
• leftDocumentCallback()
• attributeChangedCallback()
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how to use it?
Polymer(‘html5-la', {
where: ‘Santa Monica’,
created: function() {
// do something
}
});
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lifecycle
• created()
• enteredView()
• leftView()
• attributeChanged()
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Templates
are reusable
blocks of
code
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Templates
are reusable
blocks of
code
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attempt #1
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<img src="logo.png">
attempt #2
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how to create it?
![]()
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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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Shadow DOM
hides the
implementation
details
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what about
?
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what’s a
made of?
or password, textarea, date?
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how to use it?
Foo
var elem = document.querySelector(‘#elem'); var elemShadowDOM = elem.createShadowRoot(); ! elemShadowDOM.innerHTML = 'Bar
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markup, style &
script encapsulated
Foo
var elem = document.querySelector(‘#elem'); var elemShadowDOM = elem.createShadowRoot(); ! elemShadowDOM.innerHTML = ‘Bar
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how to use it?
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where can I
find them?
NPM? Bower?
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zenorocha.github.io/twitter-button
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eduardolundgren.github.io/google-maps-element
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eduardolundgren.github.io/video-camera-element
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eduardolundgren.github.io/video-tracking-element
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in other words…
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encapsulation
and code reuse
for real
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the best
way to
predict the
future is
to create it
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thanks!
zenorocha.com