Web Components: The Future of Web Applications

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Web Components: The Future of Web Applications Ire Aderinokun I/O Extended Lagos

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Hello! • Ire Aderinokun • Frontend Developer and User Interface Designer • Google Expert in Web Technologies • Writer, bitsofco.de • Software Developer at eyeo

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Building Applications on the Web is Hard

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Android

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iOS UITabBar UITabBarController

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Web

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This is because the Web is an open platform

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Building Blocks of the Web

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Early Websites

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Websites Today

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But Web Technologies are getting better

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The Solution is Web Components!

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Web Components are a set of new web platform features that let you create your own HTML elements

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Encapsulated & Reusable

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1B+ mobile devices natively support Web Components, right now!

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What is the Polymer Project?

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– The Polymer Team “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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The Polymer Project is a look into the future of web development

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1. Polymer Library

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The Polymer Library is a Javascript Library that helps you create custom reusable HTML elements, and use them to build performant, maintainable apps

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Why use the Polymer Library?

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Polymer 2.0 ! Improved Interoperability Data System Improvements Uses Native APIs Polymer CLI

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2. Elements

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3. PRPL

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4. App Toolbox

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Polymer App Toolbox is a collection of components, tools and templates for building Progressive Web Apps with Polymer

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Features • Component-based architecture using Polymer • Routing using the elements • Ofﬂine caching using Service Workers • Build tooling to support delivery over HTTP/1 or HTTP/2

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5. Tooling

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Polymer CLI

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Commands • polymer init • polymer serve • polymer lint • polymer test • polymer build • polymer analyze

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polymer init

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What can you actually do with Web Components?

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cheese.polymer-project.org

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How do Web Components work?

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4 Key Web Technologies HTML Imports Shadow DOM HTML Templates Custom Elements

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Custom Elements • An API for creating your own HTML elements by creating a Class that extends from HTMLElement • customElements.define()

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HTML Templates • A mechanism for deﬁning content that can be stored for subsequent use in a document •

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Shadow DOM • A mechanism for encapsulating a DOM and CSS, so that they can remain separate from the main document • document.body.attachShadow()

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HTML Imports • A way to package and share HTML ﬁles •

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A Simple Native Web Component

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Custom Elements API

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Base HTMLElement Class

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Shadow DOM

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How do Polymer Components Work?

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Import Polymer Library

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Custom Elements API

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HTML Template

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Data Binding

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Let’s Build a Web Component!

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Join In! 1. Install Polymer CLI • npm install -g polymer-cli 2. Create project directory • mkdir meme-maker && cd meme-maker 3. Create a new Polymer project • polymer init 4. or Clone the ﬁnal repository • bit.ly/meme-maker-polymer