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Criando aplicações
componentizadas com
Polymer
#cejs17
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Felipe Sousa
Front End Developer
GDG Fortaleza
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Aplicação
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O que é o Polymer?
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Polymer is a JavaScript library
that helps you create custom
reusable HTML elements, and
use them to build performant,
maintainable apps.
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O que de ‘novo’ ele traz?
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Our mission is to make life
better for users and developers,
by helping developers unlock
the web platform’s full
potential and by spurring the
web platform to evolve and
improve.
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#USETHEPLATFORM
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Web Components
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Shadow-dom
Method of establishing and maintaining functional
boundaries between DOM subtrees and how these
subtrees interact with each other within a
document tree.
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Isolated DOM
Scoped CSS
Simplifies CSS
Productivity
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const header = document.createElement('header');
const shadowRoot = header.attachShadow({mode: 'open'});
shadowRoot.innerHTML = '
Hello Shadow DOM
';Slide 17
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Custom Elements
Method for create and use new types of DOM
elements in a document.
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Create Scope
Atributes
Life-cycles Callbacks
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class FlagIcon extends HTMLElement {
constructor() {
super();
this._countryCode = null;
}
static get observedAttributes() { return ["country"]; }
attributeChangedCallback(name, oldValue, newValue) {
this._countryCode = newValue;
this._updateRendering();
}
get country() { return this._countryCode; }
set country(v) { this.setAttribute("country", v); }
_updateRendering() { /* update the flag icon */ }
}
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customElements.define("flag-icon", FlagIcon);
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extends HTMLElement {
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class PlasticButton extends HTMLButtonElement {
constructor() {
super();
this.addEventListener("click", () => {
// do something
});
}
}
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customElements.define("plastic-button", PlasticButton, {
extends: "button"
});
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Click Me!
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Imports
Include and reuse HTML documents in
other HTML documents.
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Templates
Method for declaring inert DOM subtrees in HTML and
manipulating them to instantiate document fragments
with identical contents
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Cool, but…
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Custom Elements v1
Shadow DOM v1
ES6
2
1
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:host { … }
Hello! I’m a personal component!
Polymer({ is: “my-personal-component” });Slide 35
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:host { … }
Hello! I’m a personal component!
Polymer({ is: “my-personal-component” }); ImportsSlide 36
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:host { … }
Hello! I’m a personal component!
Polymer({ is: “my-personal-component” }); Custom ElementsSlide 37
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:host { … }
Hello! I’m a personal component!
Polymer({ is: “my-personal-component” }); TemplatesSlide 38
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:host { … }
Hello! I’m a personal component!
Polymer({ is: “my-personal-component” }); Component!Slide 39
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:host { … }
Hello! I’m a component!
Component! - Polymer 2.0 class DomElement extends Polymer.Element { static get is() { return “my-personal-component”; } } customElements.define(DomElement.is, DomElement);Slide 40
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Everything is a
component!
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Widgets!
Web-components pode ser a solução
perfeita para widgets.
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Aplicações?
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• UI
• Properties, variables
• Binds
• Events/Listeners
• Routes
• Requests
• Performance
• Accessibility
• Tests
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Progressive Web Apps?!
• Offline App
• Instalable web app
• …
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UI Definition
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HTML e CSS
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Document Title
window.Polymer = { dom: 'shadow' }
polyfill
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:host { /*your css here*/ }
Polymer({
is: "my-component"
});
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Material Design Concept
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Paper Elements
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ITEM ONE
ITEM TWO
ITEM THREE
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App Layout
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Header
Toolbar
Icons
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Drawer
Menu
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Properties, Binds
and Methods
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:host { /*your css here*/ }
Polymer({
is: "my-component",
properties: {
propertie_name: {
type: property_type,
value: property_value
}
}
});
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:host { /*your css here*/ }
[[property_name]]
Polymer({ is: "my-component", properties: { propertie_name: { type: property_type, value: property_value } } });Slide 66
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:host { /*your css here*/ }
{{property_name}}
Polymer({ is: "my-component", properties: { propertie_name: { type: property_type, value: property_value } } });Slide 67
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:host { /*your css here*/ }
{{property_name}}
Polymer({ is: "my-component", properties: { propertie_name: { type: property_type, value: property_value } } });Slide 68
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:host { /*your css here*/ }
Click here
Polymer({
is: "my-component",
my_method: function () {
// do something
}
});
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Life-cycle Events
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- created
- ready
- attached
- detached
- attributeChanged
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Data flow, Custom
Events and Listeners.
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events
properties
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:host { display: block; }
Polymer({
is: "my-component",
properties: {
name_property: {
type: String,
value: "CEJS"
}
}
});
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:host { display: block; }
[[name]]
// “CEJS” Polymer({ is: "my-second-component", properties: { name: { type: String, value: "" } } });Slide 75
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this.fire("custom_event", {
// content event
})
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:host { display: block; }
click here
Polymer({
is: "my-component",
my_method: function () {
this.fire("custom_event", {
// your data here
})
}
});
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:host { display: block; }
Polymer({
is: "my-component",
listeners: {
"custom_event": "listen_custom_event"
},
listen_custom_event: function (e) {
console.log(e.detail); // contain detail os method.
}
});
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Route
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/home /about
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1. Captura do estado/url
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URL BAR
YOUR APP
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http://url.com/#/home
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App location Response
Padrão da rota
Dados da Rota
Dados da Sub-rota
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/home/list
{{_data}} = “home”
{{_tail}} = “list”
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/home/list/all
{{_data}} = “home”
{{_tail}} = “/list/all
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2. Show/hide Component
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Drawer
Menu
pages content
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<404—app name="404">404-app>
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Request
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R.E.Q.U.E.S.T via HTML!
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[[planet.name]]
[[planet.description]]
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Utils
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[[alias.name]]
[[alias.age]]Slide 105
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// your conditional true here
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Example
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> polymer-cli
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webcomponents.org
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speakerdeck.com/felipesousa
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github.com/felipesousa
twitter.com/felipz_sousa
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THANK`S!
#usetheplatform