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A Front End Developer at Concrete
Felipe Sousa
✈
Felipe Sousa
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progressive web apps
@felipz_sousa
done right.
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progressive web apps
done right.
@felipz_sousa
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* mobile first
* mobile friendly
* responsivity
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why experience is
important?!
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Experience
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progressive web apps
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Fast
Engaging
Interactive
*
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Fast
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Load instantly even in
uncertain network
conditions.
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Interactive
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Respond quickly to user
interactions with silky smooth
animations and no slow scrolling.
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Engaging
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Feel like a natural app on the
device, with an immersive user
experience.
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•Icons/Splashscreen
•Instalable
•Push Notifications
•Lightweight
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PROGRESSIVE WEB APPS
IS ABOUT PROVIDE A
BETTER EXPERIENCE TO
YOUR USER.
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Web Manifest
Engaging
Interactive
Fast
Service Worker
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Service Workers
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offline
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Application Cache
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...
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CACHE MANIFEST
# files
index.html
cache.html
style.css
image1.png
# Use from network if available
NETWORK:
network.html
# Fallback content
FALLBACK:
fallback.html
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A service worker is a script that your
browser runs in the background, separate
from the web page, enabling features that do
not require a web page or user interaction.
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* HTTPS is a requirement.
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Background Sync / Push API
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•Install
•Register
•Cache Control/Strategies
•Update Cache
•Listen Fetch Events
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if ('serviceWorker' in navigator) {
window.addEventListener('load', function() {
navigator.serviceWorker.register(‘/sw.js')
.then(function(registration) {})
.catch(function(err) {});
});
}
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var CACHE_NAME = ‘CACHE_NAME_EXAMPLE_2’;
var urlsToCache = [
'/',
‘/style.css’,
‘/script.js’,
‘/imagem.png'
];
self.addEventListener('install', function(event) {
event.waitUntil(
caches.open(CACHE_NAME)
.then(function(cache) {
return cache.addAll(urlsToCache);
})
);
});
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event: fetch
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self.addEventListener('fetch', function (event) {
event.respondWith(
caches.match(event.request)
.then(response => {
if(response) return response;
return fetch(event.request);
})
)
});
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var CACHE_NAME = ‘CACHE_NAME_EXAMPLE_2’;
var urlsToCache = [
'/',
‘/style.css’,
‘/script.js’,
‘/imagem.png'
];
self.addEventListener('install', function(event) {
event.waitUntil(
caches.open(CACHE_NAME)
.then(cache => cache.addAll(urlsToCache));
);
});
self.addEventListener('fetch', function (event) {
event.respondWith(
caches.match(event.request)
.then(function(response) => {
if(response) return response;
return fetch(event.request);
})
)
});
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Caching strategies
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•Cache and Update
•Cache Only
•Cache, update and refresh
•Embedded fallback
•Network or cache
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•Cache and Update
•Cache Only
•Cache, update and refresh
•Embedded fallback
•Network or cache
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self.addEventListener('fetch', function(evt) {
evt.respondWith(fromCache(evt.request));
evt.waitUntil(
update(evt.request)
.then(refresh)
);
});
function refresh(response) {
return self.clients.matchAll().then(function (clients) {
clients.forEach(function (client) {
var message = {
type: 'refresh',
url: response.url,
eTag: response.headers.get('ETag')
};
client.postMessage(JSON.stringify(message));
});
});
}
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Web Manifest
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index.html
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The web application manifest is a JSON file
that lets you control how the web
application or website is displayed to the
user in areas that are typically expected to
see native applications.
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My Page
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{
"short_name": “Application Name”,
"name": “Application Full Name",
"icons": [
{
"src": "launcher−icon−4x.png",
"sizes": "192x192",
"type": "image/png"
}
],
"start_url": "/index.html",
"display": “standalone",
"theme_color": "#77D48A",
"background_color": "#E4B0AC"
}
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{
"short_name": “Application Name”,
"name": “Application Full Name",
"icons": [
{
"src": "launcher−icon−4x.png",
"sizes": "192x192",
"type": "image/png"
}
],
"start_url": "/index.html",
"display": “standalone",
"theme_color": "#77D48A",
"background_color": "#E4B0AC"
}
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{
"short_name": “Application Name”,
"name": “Application Full Name",
"icons": [
{
"src": "launcher−icon−4x.png",
"sizes": "192x192",
"type": "image/png"
}
],
"start_url": "/index.html",
"display": “standalone",
"theme_color": "#77D48A",
"background_color": "#E4B0AC"
}
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{
"short_name": “Application Name”,
"name": “Application Full Name",
"icons": [
{
"src": "launcher−icon−4x.png",
"sizes": "192x192",
"type": "image/png"
}
],
"start_url": “/index.html?app=true”,
"display": “standalone",
"theme_color": "#77D48A",
"background_color": "#E4B0AC"
}
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{
"short_name": “Application Name”,
"name": “Application Full Name",
"icons": [
{
"src": "launcher−icon−4x.png",
"sizes": "192x192",
"type": "image/png"
}
],
"start_url": “/index.html?app=true”,
"display": “standalone",
"theme_color": "#77D48A",
"background_color": "#E4B0AC"
}
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{
"short_name": “Application Name”,
"name": “Application Full Name",
"icons": [
{
"src": "launcher−icon−4x.png",
"sizes": "192x192",
"type": "image/png"
}
],
"start_url": “/index.html?app=true”,
"display": “standalone",
"theme_color": "#77D48A",
"background_color": "#E4B0AC"
}
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• Have a registered service worker on your site.
• Have a manifest file with the basics properties.
• Be displayed by HTTPS.
• Be visited at least twice, with at least five minutes between visits.
Banner - Add to Home Screen
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2/2
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Fast
Engaging
Interactive
*
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•Accessibility
•Performance
•HTML Semantic
•Responsivity
•Push Notifications
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Progressive Web Apps
are extensible!
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/felipesousa
@felipz_sousa
felipesousa.space
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Thank’s!
Obrigado!
Gracias!