HTML5 for Java Developers AJUG June 2011 v2

Burr Sutter Sr. Product Manager, JBoss

Wes Hales Sr. Engineer, JBoss June 20 2011

www.jboss.org/webinars [email protected]

Twitter: @burrsutter [email protected]

HTML5 for the Java Developer

Demo

UI Tier/Layer Innovates faster than other application tiers

Dozens of libs/frameworks always trying to outdo each other

The most dynamic & exciting place to focus on for Web-oriented Java developers

Involves some of the most challenging programming – cross-browser RIA support

It is a matter of taste – no obvious single winner (beyond Struts).

DB

UI

Web

Browser

HTML5 CSS3

JavaScript JSON

?

Stored Procedures

NoSQL Cloud-based

Services

and RDBMS

HTML HTML

+ AJAX

Struts

JSF1+Richfaces3* or

SpringMVC or

GWT

Stored Procedures

JSF2+RichFaces4* or

SpringMVC or GWT or

RESTful UI Engine

2002 2006 2012-13+

HTML + AJAX

Struts

Stored Procedures

2010 Mid-2011

HTML + AJAX

JSF2+Richfaces4* or

SpringMVC or

GWT

Stored Procedures

Mobile + Cloud

Impact?

Bus Logic

EJB2

Struts Action

Spring +

Hibernate

Spring or Seam2 +

Hibernate/JPA

EJB 3.1 or Spring +

Hibernate/JPA

JAX-RS? +

Hibernate & NoSQL

* Or IceFaces/Primefaces

JPA/Hibernate

JTA

Messaging

Jobs

Cache

Clustering

Spring

CDI*

Security

EJB

JSF2+RichFaces4

SpringMVC

RESTEasy

Adobe Flex

GWT

HTML5 via + REST & JSON + jQuery Mobile or + Sencha or + SproutCore

JBoss Focus for UI

RichFaces 3 – JSF 1 Components RichFaces 4 – JSF 2 Components

GWT at JBoss

Future Web = HTML5+REST

HTML5+CSS3+jQuery/EXT JS

? DB

JSON REST

Websocket

Cloud Service

NoSQL

SpringMVC RESTEasy

Play! Rails

jQuery + RESTEasy $(function() {

$("#listOfCustomObjects").click(function() { console.log("listOfCustomObjects clicked"); $.getJSON("collectionjson/customers", function(returnedCustomers) { console.log("returned are " + returnedCustomers); alert("returned: " + returnedCustomers); $.each(returnedCustomers, function(index, aCustomer) { console.log(aCustomer.firstName); console.log(aCustomer.lastName); console.log(aCustomer.state); console.log(aCustomer.status); }); });

});

@GET @Path("customers") @Produces("text/json") public List<Customer> getCustomers() { Customer myCustomer = new Customer(); myCustomer.setFirstName("Burr"); myCustomer.setLastName("Sutter"); myCustomer.setState("GA"); myCustomer.setStatus(1); myCustomer.setUserName("dude"); List<Customer> customers = new ArrayList<Customer>(); customers.add(myCustomer); System.out.println("getCustomers: " + customers); return customers; }

Demo: jQuery RESTEasy

What is HTML5?

* From HTML5Rocks.com

W3C – www.w3.org/TR/html5 WHAT - whatwg.org/html

Why the hype now?

•  Chrome Browser Happened •  WHAT Working Group – standard based on reality

www.whatwg.org •  iPhone vs Adobe (no Flash) •  Smartphones outship Desktops •  10s of millions of tablets sold •  Fading Internet Explorer - no longer controls 80+% of the market •  We are ready

http://www.w3counter.com/globalstats.php

HTML5 for Designers

•  <article>, <aside>, <footer> •  Hue/saturation/luminance •  @font-face •  Border-radius (rounded corners) •  Tranforms, transitions •  Canvas 2D & 3D •  Video •  Audio

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum id sapien at purus adipiscing tempus. Sed accumsan nisi sed leo convallis tristique. Praesent dignissim mi ac felis tempus accumsan faucibus urna porta. Nulla sit amet urna vel lectus dignissim semper. Lorem ipsum dolor sit amet, consectetur adipiscing elit.




Phasellus in faucibus tortor. Integer nec augue

mi. In elit mauris, vulputate quis viverra ut,

hendrerit nec elit. Maecenas vel turpis id augue fringilla ornare nec vel dui. In at mi at arcu cursus venenatis.

Nulla facilisi. Sed elementum scelerisque

ipsum, nec adipiscing leo feugiat ultrices.

<footer>

<header>

<nav>

<aside>

<article>

90s: <tr><th colspan=2><td> 00s: <div id=“article1” class=“article”> 10s: Above

HTML5 Canvas Games

HTML5 Canvas

HTML5 Video

HTML5 for Programmers

•  Web Sockets

•  Web Storage – localStorage, Web SQL Database*, IndexedDB

•  Web Workers

•  Form Fields type=email, date, range, search, tel, color, number

•  <meter>, <progress>

•  Application Cache – offline application components

•  Notifications

•  Geolocation

•  Device Orientation

•  Server Side Events

* Web SQL Database is no longer an active specification

What about browser support today?

•  Feature Detection with tools like Modernizr and other forms of browser testing

•  ChromeFrame •  html5boilerplate

9 4 10 5

HTML 5 Support for Desktop Browsers

Html5test.com or fmbip.com http://fmbip.com/litmus

Modernizr.com no longer displays this on the home page

* *

* *

*

*

iOS 4.3 iPad 2 iPod 4

*

*

*

*

Android

Android 2.3.3 Android 2.2.1

* *

* *

* *

Android 2.2.1 iPod 4 – iOS 4.3 VS

Html5test.com iOS 4.3 via iPad2

Android 2.2 via DroidX

HTML5 Forms

HTML5 Form Fields - html5test.com Android 2.2 via DroidX

iOS 4.3 via iPhone 3G

Application Cache

iOS 4.3 on iPhone 3G Android 2.2.1 Droid X

Websockets or SSE

Android 2.2.1 Droid X iOS 4.3 on iPhone 3G

Storage & Workers

iOS 4.3 on iPhone 3G

Android 2.2.1 Droid X

WebGL? http://learningwebgl.com/blog/?page_id=1217

http://learningwebgl.com/lessons/lesson09/index.html

WebGL Support

Android SDK 3 Emulator

Android 2.x

Tweetstream Demo

HTML5 Semantic Markup

•  You app lives or dies by the UI •  Using the correct tag to accurately describe markup •  Focus on machine readable meta-data •  <nav>,<footer>, <and others> "can be" styled for positioning or

clearfix but aren't intended to be aesthetically styled (eg. border, shadow, etc...)

Modernizr What is does...

• <html class="js canvas canvastext no-geolocation rgba hsla multiplebgs borderimage borderradius boxshadow opacity cssanimations csscolumns cssgradients cssreflections csstransforms csstransforms3d csstransitions video audio localstorage sessionstorage webworkers applicationcache fontface">

• Javascript Object: Modernizr (boolean values for each feature)

if (Modernizr.localstorage) { console.log(“localStorage is available – let’s cache”); } else { console.log(“no localStorage – retrieve from server”); }

Feature Detection Using CSS

•  Creating graceful fallbacks for all browsers •  Modernizr “Cascading” detection (see next slide) •  Other mechanisms like HTML5 shiv - Inserting HTML5

elements before body tag in IE document.createElement(“aside”)


“Cascading” the detection: #nice {

background: url(background-one.png) top left repeat-x;

background: url(background-one.png) top left repeat-x,

url(background-two.png) bottom left repeat-x;

}!!Using Modernizr: !#nice { background: url(background-one.png) top left repeat-x; } .multiplebgs #nice { background: url(background-one.png) top left repeat-x, url(background-two.png) bottom left repeat-x; } !

Modernizr

• What is does not do....Modernizr doesn’t actually magically enable these properties for browsers that don’t support them.

• polyfill (n): a JavaScript shim that replicates the standard API for older browsers

Modernizr Modernizr.load({test:Modernizr.geolocation, yep : 'geo.js', nope: 'geo-polyfill.js' });!

The All-In-One Entirely-Not-Alphabetical No-Bullshit Guide to HTML5 Fallbacks http://bit.ly/html5shims

Modernizr + Polyfills

Modernizr + Polyfills

IE6+ Firefox 3.6+ Safari 4+ Safari for iOS 4.2+ Chrome 11.0+ Opera 11+

Capable of supporting...

ChromeFrame •  No admin-rights needed (comes with MSI) •  Easy redirect with... http://www.google.com/chromeframe/?redirect=http://ur.site •  Enterprise Installation •  Early adopters include Yahoo, Wordpress.com, and several Google properties

html5boilerplate

•  An HTML5 project config tool for the front and back-end

•  Front end:CSS resets, cachebusting

•  Configures Modernizr, Initialzr (templates)

•  Optimizes and minifies *everything*

•  Back end:

•  htaccess - Apacheserver or (subsystem in JBoss AS7)

•  web.config – IIS

•  nginx.conf & mime.types - nginxlighttpd.conf - lighttpdnode.jsapp.yaml and gae.py - Google App Engine

HTML5 Today...

•  What's the best option?Modernizr + PolyfillsWell known, first to marketRedundant CSS will need to be re-written laterChromeFrame Good for the IE6 folkshtml5boilerplateNeeds more polish, but very cool conceptTried to retrofit into a Java EE app but was painful

Starting small...

• After you take the leap and start an HTML5 project:HTML5 Forms

• Web Storage /Offline Access

• Mobile Web


Specific feature added to XMLHttpRequest

var formData = new FormData(); formData.append("part_num", "123ABC"); formData.append("part_price", 7.95); formData.append("part_image", somefile) var xhr = new XMLHttpRequest(); xhr.open("POST", "http://some.url/"); xhr.send(formData); or modify an existing form...

new FormData(document.getElementById("foo"));!

Offline & Storage

What's available? •  Application Cache - Quickest way to get started.

•  Speeds up initial load

•  Allows users to read fairly static content (.html) offline

•  IndexedDB - is the replacement for WebSQL Database

•  Transactional with object stores, not tables

•  Used to store and index data on client side

•  Asynchronous API - non-blocking, data is delivered to callback function

•  WebStorage - key/value based storage (no TX)

•  localStorage - maintains data across restarts – writes to local disk

•  sessionStorage - related to users browsing session (think cookies)

•  Web SQL Database – RDBMS in the browser

Web SQL Database

http://www.w3.org/TR/webdatabase/

Offline & Storage (Basics)

Checking the users connectivity (e.g. online or offline)if (navigator.onLine) { alert('online') } else { alert('offline'); }!

Events...

window.addEventListener("offline", function(e) { alert("offline"); }, false); window.addEventListener("online", function(e) { alert("online"); }, false);!

Offline & Storage Application Cache Define in markup:

<html manifest="example.appcache">

File Structure:

CACHE MANIFEST index.html stylesheet.css images/logo.png scripts/main.js

Advanced usage:

# Resources that require the user to be online. NETWORK: login.php /myapi http://api.twitter.com

!

http://www.html5rocks.com/en/tutorials/appcache/beginner/

Offline & Storage IndexedDB Opening the database

var demo = {}; demo.indexedDB = {}; demo.indexedDB.db = null; demo.indexedDB.open = function() { var request = indexedDB.open("todos"); request.onsuccess = function(e) { demo.indexedDB.db = e.target.result; // Do some more stuff when opened }; request.onfailure = demo.indexedDB.onerror; };

Creating an object store

var store = db.createObjectStore("todo", {keyPath: "timeStamp"});

!

http://www.html5rocks.com/en/tutorials/indexeddb/todo/

Gotchas - http://www.davidflanagan.com/2011/01/indexeddb-statu.html

Offline & Storage localStorage if (Modernizr.localstorage) { console.log("see if we have a cached copy "); var fromStorage = localStorage.getItem("customers"); var listOCustomers = JSON.parse(fromStorage); if (listOCustomers == null) { console.log("customers are null, fetch from server"); $.getJSON("collectionjson/customers", function(listOCustomers) { console.log("returned are " + listOCustomers); localStorage.setItem("customers", JSON.stringify(listOCustomers)); }); } else { // listOCustomers not null console.log("not Null - cached copy"); } } else { alert("Modernizr no HTML5 localStorage."); }

Offline & Storage Web SQL Database var shortName = 'DEMODB'; var version = '1.0'; var displayName = 'DEMO Database'; var maxSize = 100000; DEMODB = openDatabase(shortName, version, displayName, maxSize);

!

http://www.html5rocks.com/en/tutorials/webdatabase/todo/

Offline & Storage Web SQL Database function createTables(){ DEMODB.transaction( function (transaction) { transaction.executeSql( 'CREATE TABLE IF NOT EXISTS page_settings(id INTEGER NOT NULL PRIMARY KEY, fname TEXT NOT NULL,bgcolor TEXT NOT NULL, font TEXT, favcar TEXT);',

[], nullDataHandler, errorHandler); } ); prePopulate(); }

Top 5 Best Practices

When working with HTML5....

1) Use client side DBs instead of server round trips

2) Use CSS transitions instead of javascript animations (Enable hardware acceleration) 3) Boost performance with javascript 1.6 (no more "for loops") 4) Use cache manifests for live sites, not just offline apps 5) HTML5 Form attributes and input styles

Demo: Websockets, HornetQ, TagCanvas

Alternatives Websockets

•  Meta-data Refresh •  AJAX Polling – Javascript in the browser, polling a

particular URL for updates every N seconds •  Long Polling (Comet) – two connections •  GWT has something “built-in” •  RichFaces 4 has a push component •  Errai for extending CDI to GWT-based clients •  Atmosphere

Demo: client-side web storage

Questions?

Additional Resources •  Html5rocks.com •  Modernizr.com •  Diveintohtml5.org •  www.hongkiat.com/blog/48-excellent-html5-demos/ •  www.chromeexperiments.com •  Html5demos.com •  Html5test.com

[email protected] Twitter: @burrsutter

[email protected] Twitter: @wesleyhales

-webkit-border-radius: 10px; -khtml-border-radius: 10px; -moz-border-radius: 10px; border-radius: 10px; border: 2px #0687FF; box-shadow: inset 0px 0px 50px #777; background: #0687FF; padding: 5px; color: #fff; cursor: pointer;

Custom CSS

jQuery Mobile (out of the box)

jQuery Mobile Examples

Documents

HTML5 for Java Developers AJUG June 2011 v2