Let's build some apps with Polymer!

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Let’s build some apps with Polymer! +Rob Dodson @rob_dodson

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Photos make for excellent segue slides Photo: goo.gl/lxSPr7 Time to tackle the next challenge We have a growing ecosystem

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Photo:

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Toolbar Content list Secondary toolbar Tabs Icon buttons

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It’s time for the web to have a mobile SDK

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Agenda Structure Transitions Offline Performance

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Structure

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A basic container for controls like tabs or buttons

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All Contacts

A basic container for controls like tabs or buttons

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The flex attribute tells a child to expand to fill its parent …

All Contacts

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An animating context menu, composed of other elements

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An animating context menu, composed of other elements

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Settings Help Feedback

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Settings Help Feedback

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A simple container with a header section and a content section …

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... The condenses attribute creates a nice cross-fade effect

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Drawer panel...

Main panel...

A responsive scaffold

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Drawer panel...

Main panel...

A responsive scaffold

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Drawer panel...

Main panel...

A responsive scaffold

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A virtualized, “infinite” list

this.$.list.data = [ {name: ‘Ada Blick’}, {name: ‘Addy Osmani’}, … ];

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#ProTip Use core-image to prevent stale images in your list

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#ProTip Set core-list’s scrollTarget to core-header-panel’s scroller

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… this.$.list.scrollTarget = this.$.hPanel.scroller; Bind core-list’s scrollTarget to core-header-panel’s scroller

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… Bind core-list’s scrollTarget to core-header-panel’s scroller

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Transitions

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A pluggable system for creating smooth transitions from one view to the next. … … … EXPERIMENTAL

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… …

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#ProTip Listen for core-animated-pages-transition-prepare and call measureHeaderHeight on your header panels

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That feels like a wart. Thoughtful Developer

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You’re right.

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Routing

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router.on(‘/some/route’, function() { pages.selected = 1; });

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router.on(‘/user/:id’, function(userId) { userPage.user = userId; pages.selected = 2; });

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#ProTip Lazy load elements with Polymer.import

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router.on('/some/route', function() { Polymer.import(['more-elements.html'], function () { pages.selected = 2; }); });

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github.com/erikringsmuth/app-router my-site.com/order/:id !

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Performance

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Performance Photo:

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index.html if ('registerElement' in document && 'createShadowRoot' in HTMLElement.prototype && 'import' in document.createElement('link') && 'content' in document.createElement('template')) { // We're using a browser with native WC support! } else { document.write( '<script src=“bower_components/webcomponentsjs/webcomponents.js"><\/script>' ); } !

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109 requests 943KB :(

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Vulcanize? Photo:

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Vulcanize $ vulcanize -o build.html index.html \ --csp --strip npm install -g vulcanize

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grunt-vulcanize

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gulp-vulcanize

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3 requests 114KB

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Offline

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// Install Service Worker if (navigator.serviceWorker) { navigator.serviceWorker.register('/worker.js').then(function(reg) { console.log('◕‿◕', reg); }, function(err) { console.log('ಠ_ಠ', err); }); } root scope

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self.addEventListener('install', function(event) { // pre cache a load of stuff: event.waitUntil( caches.open('myapp-static-v1').then(function(cache) { return cache.addAll([ '/', '/styles/main.css', '/scripts/app.js', ‘/elements/elements.critical.vulcanized.html’, ‘https://polymer-contacts.firebaseio.com/all.json' ]); }) ) }); worker.js

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self.addEventListener('fetch', function(event) { var requestURL = new URL(event.request.url); ! if (requestURL.hostname == 's3.amazonaws.com') { event.respondWith(s3Response(event.request)); } else { event.respondWith( caches.match(event.request).then(function(response) { return response || fetch(event.request); }) ); } }); worker.js

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Structure Transitions Performance Offline

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core-* and paper-* elements give your app structure Transitions Performance Offline

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Structure Move between states with animated pages and routing Performance Offline

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Structure Transitions Conditional polyfills. Vulcanize all the things. Lazy loading. Offline