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<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=792, user-scalable=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Getting touchy - everything you (n)ever wanted to know about touch and pointer events / Patrick H. Lauke</title>
<link rel="stylesheet" href="shower/themes/redux/styles/screen.css">
<link rel="stylesheet" href="shower/themes/redux/styles/overrides.css">
<link rel="stylesheet" href="highlight/styles/sunburst.css">
<style>
#yougotthetouch.slide { background-color: #000; }
</style>
<script src="highlight/highlight.pack.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
</head>
<body class="shower list">
<header class="caption">
<h1>Getting touchy</h1>
<p>Everything you (n)ever wanted to know about <strong>touch and pointer</strong> events</p>
</header>
<!-- -->
<section class="slide cover title" id="Cover"><div>
<div class="titlestrap">
<h2>Getting <strong>touchy</strong></h2>
<p>Everything you (n)ever wanted to know about <strong>touch and pointer</strong> events</p>
</div>
<p class="info">Patrick H. Lauke / Last major changes: 2 May 2022</p>
<img src="pictures/backgrounds/background-cover.jpg" alt="" class="cover">
</div></section>
<!-- -->
<section class="slide listing"><div>
<h2>about me...</h2>
<ul>
<li>community group co-chair and co-editor <a target="_blank" rel="noopener" href="https://w3c.github.io/touch-events/">Touch Events Level 2</a></li>
<li>working group chair and co-editor <a target="_blank" rel="noopener" href="https://w3c.github.io/pointerevents/">Pointer Events Level 3</a></li>
</ul>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/github-patrickhlauke-getting-touchy.png" alt="">
<p><a target="_blank" rel="noopener" href="https://github.com/patrickhlauke/getting-touchy-presentation">github.com/patrickhlauke/getting-touchy-presentation</a></p>
<p>"evergreen" expanded version of this presentation<br><small>(and branches for specific conferences)</small></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/patrickhlauke.github.io.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/">patrickhlauke.github.io/touch</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/backgrounds/photo-device-testing.jpg" alt="Large number of mobile phone/tablet test devices">
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/patrickhlauke-github-touch-results.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/results/">Touch/pointer events test results</a></p>
</div></section>
<!-- -->
<section class="slide cover impact"><div>
<div><p>my JavaScript sucks...<br><small>(but will hopefully convey the right concepts)</small></p></div>
<img src="pictures/backgrounds/background-danger-415-volts.jpg" class="cover" alt="">
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>“how can I make my website<br>work on <strong>touch devices</strong>?”</p>
</div>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>you <strong>don't</strong> need <strong>touch events</strong><br>browsers <strong>emulate</strong> regular <strong>mouse events</strong></p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-mouse-before.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_mouse-only.html">patrickhlauke.github.io/touch/tests/event-listener_mouse-only.html</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-mouse-after.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_mouse-only.html">patrickhlauke.github.io/touch/tests/event-listener_mouse-only.html</a></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>compatibility mouse events</h2>
<pre><code class="json">(mouseenter) > mouseover > mousemove* > mousedown >
(focus) > mouseup > click</code></pre>
<p><small>* only a single “sacrificial” <code>mousemove</code> event fired</small></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>on first tap</h2>
<pre><code class="json">(mouseenter) > mouseover > mousemove >
mousedown > (focus) > mouseup > click</code></pre>
<h2>subsequent taps</h2>
<pre><code class="json">mousemove > mousedown > mouseup > click</code></pre>
<h2>tapping away</h2>
<pre><code class="json">(mouseout) > (blur)</code></pre>
<p><small><code>focus</code>/<code>blur</code> only on focusable elements; subtle differences between browsers</small><br>
<a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/results/#mobile-tablet-touchscreen-events">Mobile/tablet touchscreen activation/tap event order</a></p>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>emulation works,<br>but is <strong>limiting</strong>/<strong>problematic</strong></p>
</div>
</div></section>
<!-- -->
<section class="slide statement listing"><div>
<div>
<ol>
<li>delayed event dispatch</li>
<li>mousemove doesn't track</li>
</ol>
</div>
</div></section>
<!-- -->
<section class="slide statement listing"><div>
<div>
<ol>
<li><strong>delayed event dispatch</strong></li>
<li>mousemove doesn't track</li>
</ol>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-show-delay-before.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_show-delay.html">patrickhlauke.github.io/touch/tests/event-listener_show-delay.html</a></p>
<p><small>less of a problem in modern browsers, but for <strong>iOS < 9.3 or older Androids</strong> still relevant</small></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-show-delay-after.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_show-delay.html">patrickhlauke.github.io/touch/tests/event-listener_show-delay.html</a></p>
</div></section>
<!-- -->
<section class="slide statement listing"><div>
<div>
<ol>
<li>delayed event dispatch</li>
<li><strong>mousemove doesn't track</strong></li>
</ol>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/win8/chrome-particle-party.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/particle/2">patrickhlauke.github.io/touch/particle/2</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/android/chrome-particle-party-mouse-only.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/particle/2">patrickhlauke.github.io/touch/particle/2</a></p>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>“we need to go deeper...”</p>
</div>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<h2>touch events</h2>
<p>introduced by Apple, adopted in Chrome/Firefox/Opera</p>
<p><small>(and belatedly IE/Edge – more on that later)</small></p>
<p><a target="_blank" rel="noopener" href="https://www.w3.org/TR/touch-events">www.w3.org/TR/touch-events</a></p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/caniuse-touch-events-current.png" alt="">
<p><a target="_blank" rel="noopener" href="https://caniuse.com/#search=touch%20events">caniuse.com: Can I use <strong>touch events</strong>?</a></p>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p><code class="json">touchstart<br>
touchmove<br>
touchend<br>
touchcancel</code></p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-all-no-timings-before.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_all-no-timings.html">patrickhlauke.github.io/touch/tests/event-listener_all-no-timings.html</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-all-no-timings-after.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_all-no-timings.html">patrickhlauke.github.io/touch/tests/event-listener_all-no-timings.html</a></p>
<p><small><del><a target="_blank" rel="noopener" href="https://bugs.webkit.org/show_bug.cgi?id=128534">Bug 128534 - 'mouseenter' mouse compat event not fired...</a></del></small></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>events fired on tap</h2>
<pre><code class="json">touchstart > [touchmove]+ > touchend >
(mouseenter) > mouseover > mousemove > mousedown >
(focus) > mouseup > click</code></pre>
<p><small>(mouse events only fired for single-finger tap)</small></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>on first tap</h2>
<pre><code class="json">touchstart > [touchmove]+ > touchend >
(mouseenter) > mouseover > mousemove > mousedown >
(focus) > mouseup > click</code></pre>
<h2>subsequent taps</h2>
<pre><code class="json">touchstart > [touchmove]+ > touchend >
mousemove > mousedown > mouseup > click</code></pre>
<h2>tapping away</h2>
<pre><code class="json">mouseout > (mouseleave) > (blur)</code></pre>
</div></section>
<!-- -->
<section class="slide listing"><div>
<ul>
<li>too many <code>touchmove</code> events prevent mouse compatibility events after <code>touchend</code> (not considered a "clean" tap)</li>
<li>too many <code>touchmove</code> events on activatable elements can lead to <code>touchcancel</code> (in old Chrome/Browser versions)</li>
<li>not all browsers consistently send <code>touchmove</code></li>
<li>differences in <code>focus</code> / <code>blur</code> and some mouse compatibility events (e.g. <code>mouseenter</code> / <code>mouseleave</code>)</li>
<li>some events may only fire when tapping away to another focusable element (e.g. <code>blur</code>)
</ul>
<p>some browsers outright weird...</p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>Browser/Android 4.3</h2>
<pre><code class="json"><mark>mouseover</mark> > <mark>mousemove</mark> > touchstart > touchend >
mousedown > mouseup > click</code></pre>
<h2>Browser/Blackberry PlayBook 2.0</h2>
<pre><code class="json">touchstart > <mark>mouseover</mark> > <mark>mousemove</mark> > <mark>mousedown</mark> >
touchend > mouseup > click</code></pre>
<h2>UC Browser 10.8/Android 6</h2>
<pre><code class="json"><mark>mouseover</mark> > <mark>mousemove</mark> > touchstart > (touchmove)+ > touchend >
mousedown > focus > mouseup > click</code></pre>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/patrickhlauke-github-touch-results.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/results/">Touch/pointer events test results</a></p>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p><strong>shouldn't</strong> affect your code, unless you're expecting a very <strong>specific sequence</strong>...</p>
</div>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p><code><interlude ></code></p>
<p>simple <strong>feature detection</strong> for touch events</p>
</div>
</div></section>
<!-- -->
<section class="slide code"><div>
<pre><code class="js">/* feature detection for touch events */
if (<mark>'ontouchstart' in window</mark>) {
/* some clever stuff here */
}
/* older browsers have flaky support so more
hacky tests needed...use <mark>Modernizr.touch</mark> or similar */</code></pre>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/touch-detect-chrome-mobile.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/touch-feature-detect.html">patrickhlauke.github.io/touch/tests/touch-feature-detect.html</a></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<pre><code class="js">/* conditional "touch OR mouse/keyboard" event binding */
<mark>if ('ontouchstart' in window)</mark> {
// set up event listeners for touch
...
} <mark>else</mark> {
// set up event listeners for mouse/keyboard
...
}
</code></pre>
</div></section>
<!-- -->
<section class="slide cover impact"><div>
<div><p>don't make it touch-exclusive</p></div>
<img src="pictures/backgrounds/background-danger-415-volts.jpg" class="cover" alt="">
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>hybrid devices<br>touch <strong>+</strong> mouse <strong>+</strong> keyboard</p>
</div>
</div></section>
<!-- -->
<section class="slide singlepicture"><div>
<div>
<img src="pictures/backgrounds/windows-2-in-1-touch-laptop.jpg" alt="Windows 2-in-1 touchscreen laptop/tablet devices">
</div>
</div></section>
<!-- -->
<section class="slide singlepicture"><div>
<div>
<img src="pictures/backgrounds/window-touch-desktop.jpg" alt="All-in-one windows desktop device with touchscreen">
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/twitter-patrickhlauke-flickr-touch.png" alt="Tweet: a quick video showing the issue of naive 'if touch events then simply assume touch only' in flickr">
<p><a target="_blank" rel="noopener" href="https://twitter.com/patrick_h_lauke/status/717781821468098562">@patrick_h_lauke showing a naive "touch or mouse" issue on Flickr</a><br><small>(which has since been fixed)</small></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/bugzilla-sites-with-touch.png" alt="Bugzilla">
<p><a target="_blank" rel="noopener" href="https://bugzilla.mozilla.org/show_bug.cgi?id=888304">Bug 888304 - touch-events on Firefox-desktop should be disabled until we can support them...</a>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/chromium-issue392584-enable-touchevent-api-all-the-time.png" alt="">
<p><a target="_blank" rel="noopener" href="https://bugs.chromium.org/p/chromium/issues/detail?id=392584">Issue 392584: TouchEvent API should be enabled consistently</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/touch-detect-chrome-firefox-edge-desktop.png" alt="">
<p>Chrome now returns <code>window.TouchEvent</code> on non-touch devices</p>
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/touch-feature-detect.html">patrickhlauke.github.io/touch/tests/touch-feature-detect.html</a></p>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>even on <strong>"mobile"</strong> we can have multiple inputs...</p>
</div>
</div></section>
<!-- -->
<section class="slide singlepicture"><div>
<div>
<img src="pictures/htc-hero-android-2.1/photo-htc-hero-product-shot.jpg" alt="HTC Hero touchscreen phone with built-in trackball">
</div>
</div></section>
<!-- -->
<section class="slide singlepicture"><div>
<div>
<img src="pictures/backgrounds/htc-wildfire-mouse.jpg" alt="">
<p>HTC Wildfire with optical trackball sends mouse events...</p>
</div>
</div>
</section>
<!-- -->
<section class="slide singlepicture"><div>
<div>
<img src="pictures/android/photo-android-laptops.jpg" alt="Android tablet-based laptops">
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<div>
<img src="pictures/backgrounds/windows-continuum.jpg" alt="Windows 10 Mobile phone using 'Continuum' - with a connected screen, mouse and keyboard">
<p><a target="_blank" rel="noopener" href="https://www.microsoft.com/en-us/windows/Continuum">Windows 10 "Continuum"</a> <small>(mobile device acting as desktop)</small></p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<div>
<img src="pictures/backgrounds/samsung-dex.jpg" alt="Samsung Galaxy S8 plugged into a DeX Station - with a connected screen, mouse and keyboard">
<p><a target="_blank" rel="noopener" href="http://www.samsung.com/global/galaxy/apps/samsung-dex/">Samsung DeX</a> <small>(mobile device acting as desktop)</small></p>
<p><small><a target="_blank" rel="noopener" href="https://medium.com/samsung-internet-dev/samsung-dex-brings-a-new-dimension-to-the-mobile-web-f80d7edcab29">Samsung DeX brings a new Dimension to the Mobile Web</a></small></p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/backgrounds/photo-android-mouse.jpg" alt="">
<p>Android + mouse – <strong>like touch</strong> (mouse emulating touch)</p>
<p><code class="json">touchstart > touchend > mouseover > mousemove >
mousedown > (focus) > mouseup > click</code></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/backgrounds/photo-android-chrome59-mouse.jpg" alt="">
<p>Android + Chrome 58 + mouse – <strong>like desktop</strong></p>
<p>mouse events (+ pointer events) + <code>click</code></p>
<p><a target="_blank" rel="noopener" href="https://groups.google.com/a/chromium.org/forum/m/#!msg/blink-dev/cNaFvMaYtNA/41Bstx8oAwAJ">blink-dev: mouse on Android stops firing TouchEvents</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/backgrounds/photo-playbook-mouse.jpg" alt="">
<p>Blackberry PlayBook 2.0 + mouse – <strong>like desktop</strong></p>
<p><code class="json">mouseover > mousedown > (mousemove)+ > mouseup > click</code></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/backgrounds/photo-blackberry-leap-mouse.jpg" alt="">
<p>Blackberry Leap (BBOS 10.1) + mouse – <strong>like desktop</strong></p>
<p><code class="json">mouseover > mousedown > (mousemove)+ > mouseup > click</code></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/backgrounds/photo-android-keyboard.jpg" alt="">
<p>Android + keyboard – <strong>like desktop</strong></p>
<p><code class="json">focus / click / blur</code></p>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p>iOS keyboard by default only works in same situations as on-screen keyboard<br>
<small>(e.g. text inputs, URL entry)</small></p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios13/ios-accessibility-keyboard.jpg" alt="">
<p>iOS13+ enable full keyboard access (equivalent to desktop keyboard support)</p>
<p><code>Settings > Accessibility > Keyboard > Full Keyboard Access</code></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios13/ios13-keyboard-button-events.png" alt="">
<p>iOS + keyboard – keyboard, touch, pointer, and mouse events</p>
<p><small><code class="json">focus > pointerover > pointerenter > touchstart > mouseover > mouseenter > gotpointercapture > pointerup > lostpointercapture > mouseout > mouseleave > pointerout > pointerleave > touchend > mousedown > mouseup > click</code></small></p>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p>mobile Assistive Technologies<br>
<small>(e.g. screen readers on touchscreen devices)</small></p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/voiceover-event-listener-all-no-timings-after.png" alt="">
<p>iOS + VoiceOver (with/without keyboard) – <strong>similar to touch</strong></p>
<p><code class="json">focus / touchstart > touchend > (mouseenter) > mouseover > mousemove > mousedown > blur > mouseup > click</code></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/android/android4.3-chrome-talkback-activate.png" alt="">
<p>Android 4.3/Chrome + TalkBack – <strong>keyboard/mouse hybrid</strong></p>
<p><code class="json">focus / blur > mousedown > mouseup > click > focus</code></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/android/android6.1-chrome-talkback-activate.png" alt="">
<p>Android 6.1/Chrome + TalkBack – <strong>like touch</strong></p>
<p><code class="json">touchstart > touchend > mouseover > mouseenter > mousemove > mousedown > focus > mouseup > click</code></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/android/android6.1-firefox-talkback-activate.png" alt="">
<p>Android 6.1/Firefox + TalkBack – <strong>similar to touch</strong></p>
<p><code class="json">touchstart > mousedown > focus > <strong>touchend</strong> > mouseup > click</code></p>
</div></section>
<!-- -->
<section class="slide listing"><div>
<h2>further scenarios?</h2>
<ul>
<li>desktop with external touchscreen</li>
<li>touchscreen laptop with non-touch second screen</li>
<li>touchscreen laptop with trackpad/mouse</li>
<li>...and other permutations?</li>
</ul>
</div></section>
<!-- -->
<section class="slide listing"><div>
<h2>note on trackpad gestures</h2>
<ul>
<li>trackpads that allow multi-finger gestures (e.g. recent MacBooks, Magic Mouse/Trackpad, Windows precision trackpad, ASUS Smart Gesture, Wacom Intuos Pro gestures etc) <strong>don't fire touch events</strong> / expose touch points</li>
<li>these gestures are handled directly by the OS/driver and don't reach the browser as raw touches</li>
<li>Wacom Intuos Pro touch input exposed as mouse to OS</li>
<li>OS X/Safari 9.1+ does fire <a target="_blank" rel="noopener" href="https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html#//apple_ref/doc/uid/TP40006511-SW23">Apple's proprietary <code>gesture*</code> events</a> (for pinch-to-zoom, rotation)</li>
</ul>
</div></section>
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<section class="slide impact"><div>
<div>
<p>no way to detect these cases...</p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/github-modernizr-detects-touch-events-not-touch-screens.png" alt="">
<p><a target="_blank" rel="noopener" href="https://github.com/modernizr/modernizr/issues/548"><code>Modernizr.touch</code> detects touch events not touch devices</a>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/github-modernizr-detecting-a-mouse-user.png" alt="">
<p><a target="_blank" rel="noopener" href="https://github.com/Modernizr/Modernizr/issues/869">Modernizr: Detecting a mouse user</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/stucox-you-cant-detect-a-touchscreen.png" alt="">
<p><a target="_blank" rel="noopener" href="http://www.stucox.com/blog/you-cant-detect-a-touchscreen/">Stu Cox: You can't detect a touchscreen</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/hacks-mozilla-detecting-touch-why-not-how.png" alt="">
<p><a target="_blank" rel="noopener" href="https://hacks.mozilla.org/2013/04/detecting-touch-its-the-why-not-the-how/">hacks.mozilla.org - Detecting touch [...]</a></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<pre><code class="js">/* feature detection for touch events */
if ('ontouchstart' in window) {
<mark> /* browser supports touch events but user is
not necessarily using touch (exclusively) */</mark>
<mark> /* it could be a mobile, tablet, desktop, fridge ... */</mark>
}
</code></pre>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>touch <strong>or</strong> mouse <strong>or</strong> keyboard</p>
</div>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>touch <strong>and</strong> mouse <strong>and</strong> keyboard</p>
</div>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p>what about<br><strong>CSS4 Media Queries</strong>?</p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/w3c-media-queries-level4.png" alt="">
<p><a target="_blank" rel="noopener" href="https://drafts.csswg.org/mediaqueries-4/">W3C Media Queries Level 4 (Editor's Draft)</a></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>Interaction Media Features</h2>
<p><code>pointer</code> / <code>hover</code> relate to “primary” pointing device<br><code>any-pointer</code> / <code>any-hover</code> relate to all pointing devices</p>
<pre><code class="css">
/* the <mark><strong>primary input</strong></mark> is ... */
@media (pointer: fine) { /* a mouse, stylus, ... */ }
@media (pointer: coarse) { /* a touchscreen, ... */ }
@media (pointer: none) { /* not a pointer (e.g. d-pad) */ }
@media (hover: hover) { /* hover-capable */ }
@media (hover: none) { /* not hover-capable */ }
</code></pre>
<p><small><a target="_blank" rel="noopener" href="https://lists.w3.org/Archives/Public/www-style/2016Feb/0041.html"><code>hover: on-demand</code> / <code>any-hover: on-demand</code> removed in recent drafts</a></small></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>Interaction Media Features</h2>
<p><code>pointer</code> / <code>hover</code> relate to “primary” pointing device<br><code>any-pointer</code> / <code>any-hover</code> relate to all pointing devices</p>
<pre><code class="css">
/* across <mark><strong>all detected pointing devices</strong></mark> at least one is ... */
@media (any-pointer: fine) { /* a mouse, stylus, ... */ }
@media (any-pointer: coarse) { /* a touchscreen, ... */ }
@media (any-pointer: none) { /* <mark><strong>none of them</strong></mark> are pointers */ }
@media (any-hover: hover) { /* hover-capable */ }
@media (any-hover: none) { /* <mark><strong>none of them</strong></mark> are hover-capable */ }
</code></pre>
<p><small><a target="_blank" rel="noopener" href="https://lists.w3.org/Archives/Public/www-style/2016Feb/0041.html"><code>hover: on-demand</code> / <code>any-hover: on-demand</code> removed in recent drafts</a></small></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/caniuse-interaction-media-features.png" alt="">
<p><a target="_blank" rel="noopener" href="https://caniuse.com/#search=interaction%20media%20features">caniuse.com: Can I use <strong>interaction media features</strong>?</a></p>
<p><a target="_blank" rel="noopener" href="https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries#-moz-touch-enabled"><code>-moz-touch-enabled</code> in Firefox</a></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>Media Features and JavaScript</h2>
<pre><code class="js">
if (window.matchMedia("(any-pointer:coarse)").matches) { ... }
/* listen for dynamic changes */
window.matchMedia("(any-pointer:coarse)")↵
.onchange = function(e) { ... }
window.matchMedia("(any-pointer:coarse)")↵
.addEventListener("change", function(e) { ... } , false }
window.matchMedia("(any-pointer:coarse)")↵
.removeEventListener("change", function(e) { ... } , false }
</code></pre>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/caniuse-matchmedia.png" alt="">
<p><a target="_blank" rel="noopener" href="https://caniuse.com/#search=matchMedia">caniuse.com: Can I use <strong><code>matchMedia</code></strong>?</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/css-tricks-interaction-media-features.png" alt="">
<p><a target="_blank" rel="noopener" href="https://css-tricks.com/interaction-media-features-and-their-potential-for-incorrect-assumptions/">CSS-Tricks - Interaction Media Features and their potential (for incorrect assumptions)</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/css4-interaction-media-features-phone-mouse.png" alt="CSS4 Interaction Media Features tests on a touchscreen phone, with and without a paired bluetooth mouse - primary input remains touchscreen (so pointer:coarse and hover:on-demand), but additional capabilities of mouse are detected (any-pointer:fine and hover:hover also evaluated to true)">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/pointer-hover-any-pointer-any-hover/">patrickhlauke.github.io/touch/pointer-hover-any-pointer-any-hover</a></p>
<p><small>primary input is unchanged (and Chrome/Android required full restart – <a href="https://bugs.chromium.org/p/chromium/issues/detail?id=442418">Issue 442418</a>)</small></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<pre><code class="css">/* Naive uses of Interaction Media Features */
@media (pointer: fine) {
/* primary input has fine pointer precision...
so make all buttons/controls small? */
}
@media (hover: hover) {
/* primary input has hover...so we can rely on it? */
}
/* pointer and hover only check "primary" input, but
what if there's a secondary input that lacks capabilities? */</code></pre>
</div></section>
<!-- -->
<section class="slide code"><div>
<pre><code class="css">/* Better uses of Interaction Media Features */
@media (any-pointer: coarse) {
/* at least one input has coarse pointer precision...
provide larger buttons/controls for touch */
}
/* test for *any* "least capable" inputs (primary or not) */
<del>@media (any-hover: none) {</del>
<del>/* at least one input lacks hover capability...</del>
<del>don't rely on it or avoid altogether */</del>
<del>}</del>
</code></pre>
<p><small>Limitation: <a target="_blank" rel="noopener" href="https://github.com/w3c/csswg-drafts/issues/841">[mediaqueries-4] any-hover can't be used to detect mixed hover and non-hover capable pointers</a>. Also, <code>pointer</code>/<code>hover</code>/<code>any-pointer</code>/<code>any-hover</code> don't cover non-pointer inputs (e.g. keyboards) – <strong>always assume non-hover-capable inputs</strong></small></p>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p>detect which input the users is using <strong>right now</strong>...</p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/github-what-input.png" alt="">
<p><a target="_blank" rel="noopener" href="https://github.com/ten1seven/what-input">GitHub: ten1seven / what-input</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/sites/what-input-demo.png" alt="">
<p><a target="_blank" rel="noopener" href="http://ten1seven.github.io/what-input/">Demo: What Input?</a></p>
</div></section>
<!-- -->
<section class="slide singlepicture"><div>
<div>
<img src="pictures/win10/office-2013-mouse-touch-switch.png" alt="Office 2013 in Windows offers a 'Touch/Mouse mode' switch - shown by default on touch-capable devices, but can be accessed even on mouse-only devices; switching to touch mode increases spacing and touch target of all ribbon controls">
<p>if in doubt, offer a way to switch interfaces...<br>or just <strong>always use a touch-optimised interface</strong></p>
</div>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p><code></ interlude ></code></p>
</div>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>touch events<br><strong>vs</strong><br><strong>limitations</strong>/<strong>problems</strong></p>
</div>
</div></section>
<!-- -->
<section class="slide statement listing"><div>
<div>
<ol>
<li>delayed event dispatch</li>
<li>mousemove doesn't track</li>
</ol>
</div>
</div></section>
<!-- -->
<section class="slide statement listing"><div>
<div>
<ol>
<li><strong>delayed event dispatch</strong></li>
<li>mousemove doesn't track</li>
</ol>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-show-delay-after.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_show-delay.html">patrickhlauke.github.io/touch/tests/event-listener_show-delay.html</a></p>
<p><small>less of a problem in modern browsers, but for <strong>iOS < 9.3 or older Androids</strong> still relevant</small></p>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>why the delay?<br><strong>double-tap to zoom</strong><br><small>(mostly anyway)</small></p>
</div>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p><strong>when</strong> does the delay happen?</p>
</div>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-all-before.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener.html">patrickhlauke.github.io/touch/tests/event-listener.html</a></p>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/ios7/event-listener-all-after.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener.html">patrickhlauke.github.io/touch/tests/event-listener.html</a></p>
</div></section>
<!-- -->
<section class="slide code"><div>
<h2>touch / mouse events delay</h2>
<pre><code class="json">touchstart > [touchmove]+ > touchend >
<mark>[300ms delay]</mark>
(mouseenter) > mouseover > mousemove > mousedown >
(focus) > mouseup > click</code></pre>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>“how can we make it feel <strong>responsive</strong> like a native app?”</p>
</div>
</div></section>
<!-- -->
<section class="slide impact"><div>
<div>
<p>react to events fired <strong>before</strong> the 300ms delay...</p>
</div>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p><code>touchstart</code> for an “immediate” control<br><small>(e.g. fire/jump button on a game)</small></p>
</div>
</div></section>
<!-- -->
<section class="slide statement"><div>
<div>
<p><code>touchend</code> for a control that fires after finger lifted</p>
<p><small>(but this can result in events firing after zoom/scroll)</small></p>
</div>
</div></section>
<!-- -->
<section class="slide cover impact"><div>
<div><p>don't make it touch-exclusive</p></div>
<img src="pictures/backgrounds/background-danger-415-volts.jpg" class="cover" alt="">
</div></section>
<!-- -->
<section class="slide code"><div>
<pre><code class="js">/* DON'T DO THIS:
conditional "touch OR mouse/keyboard" event binding */
<mark>if ('ontouchstart' in window)</mark> {
// set up event listeners for touch
foo.addEventListener('touchend', ...);
...
} <mark>else</mark> {
// set up event listeners for mouse/keyboard
foo.addEventListener('click', ...);
...
}
</code></pre>
</div></section>
<!-- -->
<section class="slide"><div>
<img src="pictures/win10/chrome-naive-touch-or-mouse-touchscreen-desktop.png" alt="">
<p><a target="_blank" rel="noopener" href="https://patrickhlauke.github.io/touch/tests/event-listener_naive-touch-or-mouse.html">patrickhlauke.github.io/touch/tests/event-listener_naive-touch-or-mouse.html</a></p>
</div></section>
<!-- -->
<section class="slide code"><div>