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Modern Web Applications


Of course we're using Geolocation!





What is a modern web application?

The Power Of The Cloud
Native & Desktop Richness
Modern Web Apps

Tight Focus

A great web application has a tight focus encouraging people to interact, engage, and accomplish something, rather than passively view content.

Provide Rich Visuals

A great web application provides rich visuals that will delight the eye without distracting the mind.

Great User Experiences

A great web application uses the latest web technologies enhance the user experience, so users can complete their work faster, easier and with confidence.

IO Reader

Demo [Source]

How do we do it?

MVC Frameworks - Prevent Spaghetti Code

MVC controller
view model

MVC frameworks

CSS frameworks

How do we create great user experiences?

Make it easy to try & use

Use responsive layout for different form factors

Media Queries for Style Sheets

<link rel="stylesheet" media="all" href="/static/css/base.min.css" />
<link rel="stylesheet" media="only screen and (max-width: 800px)" 
  href="/static/css/mobile.min.css" />

Testing CSS media queries in JavaScript with window.matchMedia()

if (window.matchMedia('only screen and (max-width: 480px)').matches) {
  // Asynchronously provide experience optimized for phone
} else if (window.matchMedia('only screen and (min-width: 481px) and ' +
                             '(max-width: 1024px)').matches) {
  // Asynchronously provide experience optimized for table or smaller screen
} else {
  // Asynchronously provide full screen experience

Allow for deep linking & single page navigation

function updateHash(push) {
  if (push) {
    var slideNo = curSlide + 1;
    var hash = '#' + slideNo;
    window.history.pushState(slideNo, 'Slide ' + slideNo, hash);
window.addEventListener('popstate', handlePopState, false);
function handlePopState(event) {
  if (event.state != null) {
    curSlide = event.state - 1;

Make uploading files easier

<input type="file" id="dir-select" webkitdirectory />
document.querySelector('#dir-select').onchange = function(e) {
  var out = [];
  for (var i = 0, f; f =[i]; ++i) {
  document.querySelector('output'),textContent = out.join('/n');

Use desktop file handling paradigms

<a href="src/star.mp3" draggable="true" class="dragout"
var files = document.querySelectorAll('.dragout');
for (var i = 0, file; file = files[i]; ++i) {
  file.addEventListener('dragstart', function(e) {
    e.dataTransfer.setData('DownloadURL', this.dataset.downloadurl);
  }, false);
Drag each of these files onto your desktop: 3D Glasses [PDF] Star [MP3]

( this feature is only available in Google Chrome )

Use Web Intents

Use desktop file handling paradigms

  addEventListener('drop', function(e) {
    var reader = new FileReader();
    reader.onload = function(evt) {
      document.querySelector('img').src =;
}, false);
Drop in images from your desktop

Save data to the local file system

window.requestFileSystem(TEMPORARY, 1048576, initFs, fsError);
function saveFile(arrayBuffer, filename, type, callback) {
  fs.root.getFile(filename, {create: true}, function(fileEntry) {
    fileEntry.createWriter(function(fileWriter) {
      var bb = new BlobBuilder();
    }, fsError);
  }, fsError);
Browse File System

Make it work offline

Application Cache to enable the application

<html manifest="cache.appcache">

Store data locally

window.requestFileSystem(PERSISTENT, 1048576, initFs, fsError);
var idbRequest ='Database Name');
localStorage["key"] = "value";

Track online and offline states

window.addEventListener('online', function(e) {
  // Re-sync data with server.
}, false);

Persist users data

var elems = document.querySelectorAll("textarea, input");
var len = elems.length;
for (var i = 0; i < len; i++) {
  var elem = elems[i];
  elem.addEventListener("input", function(item) {
    localStorage[formName + "-" +] = 
    var debug = document.getElementById("data-persistence-debug");
    debug.innerHTML = "Last auto-saved at: " + new Date();
  }, false);

LawnChair - simple json storage

Let the user tell you what they want

<input type="text" x-webkit-speech />
function startSearch(event) {
  if ( > 1) {
    var second =[1].utterance;
    document.getElementById("second_best").value = second;

Keep your user informed

function showNotifications(pic, title, text) {
  if (window.webkitNotifications.checkPermission() == 0) {
    var notificationWindow = 
      window.webkitNotifications.createNotification(pic, title, text);;
    // close notification automatically after a timeout    
    setTimeout(function(popup) { 
    }, 6000, notificationWindow);

Treat performance like a feature

Use Application Cache to provide local caching

<html manifest="cache.appcache">

Store data locally

window.requestFileSystem(PERSISTENT, 1048576, initFs, fsError);
var idbRequest ='Database Name');
localStorage["key"] = "value";

Use CSS3 transitions, transforms and animations

transition: all 1s ease-in-out;

Use WebWorkers for non-blocking JavaScript

var worker = new Worker('myworker.js');

More great tips at

How about older browsers?

HTML5 Cross Browser Polyfills

Chrome Frame

<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">

Other helpful libraries

HTML5 Boiler Plate, Modernizr, jQuery

Step 1. Build web app
Step 2. ???????
Step 3. Profit!
Make it easy for user to discover great apps, extensions, and themes
Make it easy for developers and brands to reach the 160+ million Chrome users
  • Multiple monetization models, including one-time, subscriptions and in-app payments
  • One-time $5 developer registration fee
  • No review or approval process
  • No restrictions on advertising
  • No restrictions on the platform

Available in 41 Languages

Play 23% more and spend 147% more
100% more engagement
Step 1. Create application manifest
Step 2. Upload manifest & graphics
Step 3. Publish



Chrome Web Store manifest file

{ "name": "My Chrome Web Store",
  "description": "Discover great apps, games, extensions and...",
  "version": "1.0", 
  "icons": {
    "16": "16.png",
    "128": "128.png"
  "app": {
    "urls": ["*://"],
    "launch": { 
      "web_url": ""
  "permissions": ["unlimitedStorage", "notifications"]


In App Payments

  • No per transaction fees
  • No monthly fees
  • No sign up fees
  • PCI compliance

One last thing...

Aim for a great experience, everything else will follow.


Developer Guides

Best Practices




The web is what you make of it.