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Building HTML5
Tablet Apps
for iOS and Android
MINNEWEBCON 2012
@skirchmeier
@mikebollinger
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HTML5 apps
kinda suck.
The elephant in the room:
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Native vs. HTML5
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Native
-- Expensive to develop
HTML5
+ Cheaper to develop
-- One platform at a time
+ Snappy
+ Refined (true native feel)
+ Full featured -- Limited features
-- Unrefined
-- Slower
+ All platforms at a time
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Reasons
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Money
1
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Time
2
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Audience
3
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Control
4
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Money
1
Time
2
Audience
3
Control
4
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5
Design Patterns
T A B L E T S
H A V E
F L E X I B L E
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Money
1
Time
2
Audience
3
Control
4
Flexible
Design
Patterns
5
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Change the
game.
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Examples
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Best Buy
http://bby-uv.appspot.com/
Financial Times
http://app.ft.com
Proof
http://proofwhisky.com
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Best Buy
http://bby-uv.appspot.com/
Financial Times
http://app.ft.com
Proof
http://proofwhisky.com
iOS Only >!
iOS Only >!
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Frameworks
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jQuery Mobile
jQTouch
Sencha Touch
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Native Wrappers
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PhoneGap
Titanium
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Our Custom App
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No content
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http://livefront.com/explore
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How do we build
this?
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Step 1:
Travel the world
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Step 2:
HTML
(sorry)
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...
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Techniques
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Transitions
Two ways to animate:
1. jQuery (.animate)
2. CSS (-webkit-transform)
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Transitions
Two ways to animate:
1. jQuery (.animate)
2. CSS (-webkit-transform)
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Transitions
What can we do with CSS?
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Transitions
-webkit-transform
translate
scale
skew
rotate
-webkit-animation
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Transitions
-webkit-transform
translate
scale
skew
rotate
-webkit-animation
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Transitions
...
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Transitions
-webkit-transform:
translate3d(100%, 0, 0);
div#splash div#content
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Transitions
-webkit-transform:
translate3d(100%, 0, 0);
div#splash div#content
-webkit-transition:
all 600ms ease-in-out;
-webkit-transform:
translate3d(0, 0, 0);
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Touch Events
How touch events work
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Touch Events
Touch Multi-Touch Gesture
iOS P P P
Android 2.3 P
Android 3 P P
Android 4 P P
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Touch Events
Touch Multi-Touch Gesture
iOS P P P
Android 2.3 P
Android 3 P P
Android 4 P P
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Touch Events
touchstart
touchmove
touchend
touchcancel
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Touch Events
slides.bind(touchstart, function (e) {
if (touchId !== null) {
e.stopPropagation();
e.preventDefault();
} else {
var touch = e.originalEvent.touches[0];
touchId = touch.identifier;
touchStart(touch.clientX);
}
});
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Touch Events
slides.bind(touchstart, function (e) {
if (touchId !== null) {
e.stopPropagation();
e.preventDefault();
} else {
var touch = e.originalEvent.touches[0];
touchId = touch.identifier;
touchStart(touch.clientX);
}
});
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Touch Events
slides.bind(touchstart, function (e) {
if (touchId !== null) {
e.stopPropagation();
e.preventDefault();
} else {
var touch = e.originalEvent.touches[0];
touchId = touch.identifier;
touchStart(touch.clientX);
}
});
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Touch Events
slides.bind(touchstart, function (e) {
if (touchId !== null) {
e.stopPropagation();
e.preventDefault();
} else {
var touch = e.originalEvent.touches[0];
touchId = touch.identifier;
touchStart(touch.clientX);
}
});
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Touch Events
slides.bind(touchmove, function (e) {
var touch = e.originalEvent.touches[0];
if (touch.identifier == touchId) {
touchMove(touch.clientX);
}
});
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Touch Events
slides.bind(touchend, function (e) {
var touch = e.originalEvent.changedTouches[0];
if (touch.identifier == touchId) {
touchEnd(touch.clientX);
}
});
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Touch Events
function touchEnd(x) {
...
if (Math.abs(deltaX) > threshold) {
swipe(direction);
} else if (Math.abs(deltaX) >
Config.slideshowSwipeDistanceThreshold &&
touchDuration <
Config.slideshowSwipeDurationThreshold) {
swipe(direction);
} else {
snapBack();
}
}
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Touch Events
function touchEnd(x) {
...
if (Math.abs(deltaX) > threshold) {
swipe(direction);
} else if (Math.abs(deltaX) >
Config.slideshowSwipeDistanceThreshold &&
touchDuration <
Config.slideshowSwipeDurationThreshold) {
swipe(direction);
} else {
snapBack();
}
}
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Touch Events
function touchEnd(x) {
...
if (Math.abs(deltaX) > threshold) {
swipe(direction);
} else if (Math.abs(deltaX) >
Config.slideshowSwipeDistanceThreshold &&
touchDuration <
Config.slideshowSwipeDurationThreshold) {
swipe(direction);
} else {
snapBack();
}
}
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Touch Events
function touchEnd(x) {
...
if (Math.abs(deltaX) > threshold) {
swipe(direction);
} else if (Math.abs(deltaX) >
Config.slideshowSwipeDistanceThreshold &&
touchDuration <
Config.slideshowSwipeDurationThreshold) {
swipe(direction);
} else {
snapBack();
}
}
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Touch Events
function touchEnd(x) {
...
if (Math.abs(deltaX) > threshold) {
swipe(direction);
} else if (Math.abs(deltaX) >
Config.slideshowSwipeDistanceThreshold &&
touchDuration <
Config.slideshowSwipeDurationThreshold) {
swipe(direction);
} else {
snapBack();
}
}
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Touch Events
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Touch Events
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Touch Events
div.slide div.slide
div.slide
div#slides-container
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Touch Events
div.slide div.slide
div.slide
div#slides-container
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Touch Events
Gotcha #1: Android browser
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Touch Events
Gotcha #1: Android browser
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Touch Events
Gotcha #1: Android browser
![]()
vs. background-image
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Touch Events
Gotcha #2: Mobile Safari Bounce
$(document).bind('touchmove’, function(event){
event.preventDefault();
});
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Touch Events
Gotcha #3: Testing on Desktop
var hasTouch = 'ontouchstart' in document.documentElement;
var touchstart = hasTouch ? 'touchstart' : 'mousedown';
var touchmove = hasTouch ? 'touchmove' : 'mousemove';
var touchend = hasTouch ? 'touchend' : 'mouseup';
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Touch Events
Gotcha #4: Click Events are Slow
Click Event vs. Touch Event
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Hardware (GPS)
JS - iOS JS - Android PhoneGap
Accelerometer P P
Compass P P
Gyroscope P P
Camera P
Contacts P
Local Storage P P P
Geolocation P P P
Notifications P
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Hardware (GPS)
JS - iOS JS - Android PhoneGap
Accelerometer P P
Compass P P
Gyroscope P P
Camera P
Contacts P
Local Storage P P P
Geolocation P P P
Notifications P
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Hardware (GPS)
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Hardware (GPS)
function displayCurrentLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(
function (position) {
var lat = position.coords.latitude;
var lng = position.coords.longitude;
...
// Display lat/lng
}
);
}
};
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Work Offline
Local Storage
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Work Offline
Gotcha: 5mb
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Work Offline
var hasLocalStorage = (function () {
try {
localStorage.setItem('test', 'test');
localStorage.removeItem('test');
return true;
} catch(e) {
return false;
}
})();
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Work Offline
var localStoragePhotoData = null;
if (hasLocalStorage) {
localStoragePhotoData = localStorage.getItem(key);
}
if (localStoragePhotoData === null) {
if (hasLocalStorage) {
// Save photo data to localStorage.
var photoDataString = JSON.stringify(PhotoData);
localStorage.setItem(key);
...
}
} else {
// Use photo data cached in localStorage.
var photoDataObject = JSON.parse(localStoragePhotoData);
...
}
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Work Offline
var localStoragePhotoData = null;
if (hasLocalStorage) {
localStoragePhotoData = localStorage.getItem(key);
}
if (localStoragePhotoData === null) {
if (hasLocalStorage) {
// Save photo data to localStorage.
var photoDataString = JSON.stringify(PhotoData);
localStorage.setItem(key);
...
}
} else {
// Use photo data cached in localStorage.
var photoDataObject = JSON.parse(localStoragePhotoData);
...
}
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Work Offline
var localStoragePhotoData = null;
if (hasLocalStorage) {
localStoragePhotoData = localStorage.getItem(key);
}
if (localStoragePhotoData === null) {
if (hasLocalStorage) {
// Save photo data to localStorage.
var photoDataString = JSON.stringify(PhotoData);
localStorage.setItem(key);
...
}
} else {
// Use photo data cached in localStorage.
var photoDataObject = JSON.parse(localStoragePhotoData);
...
}
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Work Offline
var localStoragePhotoData = null;
if (hasLocalStorage) {
localStoragePhotoData = localStorage.getItem(key);
}
if (localStoragePhotoData === null) {
if (hasLocalStorage) {
// Save photo data to localStorage.
var photoDataString = JSON.stringify(PhotoData);
localStorage.setItem(key);
...
}
} else {
// Use photo data cached in localStorage.
var photoDataObject = JSON.parse(localStoragePhotoData);
...
}
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Sizing
Support different screens
Handle rotation
Hide browser chrome
Disable zoom
Disable other browser features
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Sizing
Support different screens
Easier in HTML than native
% based layouts
background-size: cover;
Absolute positioning is often necessary
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Sizing
Handle rotation
$(window).resize(doSomething);
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Sizing
Handle rotation
$(window).resize(reposition);
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Sizing
Handle rotation
Gotcha: You get notification after rotation is
complete
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Sizing
Hide browser chrome
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Sizing
Disable zoom
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Sizing
Disable other browser features
/* turn off default press states */
-webkit-tap-highlight-color: transparent;
/* disable save image on long press */
-webkit-touch-callout: none;
/* disable selection copy/paste */
-webkit-user-select: none;
/* disable dragging images */
-webkit-user-drag: none;
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Distribution
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Distribution
Two ways to distribute:
1. Web only
Reminder to bookmark
2. App gallery
Custom native wrapper
Framework like PhoneGap
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Distribution
Two ways to distribute:
1. Web only
Reminder to bookmark
2. App gallery
Custom native wrapper
Framework like PhoneGap
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Distribution
https://github.com/cubiq/
add-to-homescreen
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Distribution
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Distribution
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Distribution
Home Screen Icon
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Distribution
144 x 144
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Distribution
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Transitions
Touch Events
Hardware (GPS)
Work Offline
Sizing
Distribution
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Go explore.
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Thanks!
MINNEWEBCON 2012
@skirchmeier
@mikebollinger
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APP:
http://livefront.com/explore
SOURCE CODE:
http://github.com/livefront/
minnewebcon2012-explore
SLIDES:
http://livefront.com/explore/slides.pdf