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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Seamless iframes: The future, today!</title>
<meta name="description" content="Slides from Ben Vinegar's talk on Seamless Iframes, first presented at Gotham JS (NYC) on July 14th, 2012.">
<meta name="author" content="Ben Vinegar">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<link rel="stylesheet" href="css/reset.css">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/local.css">
<link rel="stylesheet" href="css/print.css" type="text/css" media="print">
<link rel="stylesheet" href="lib/tomorrow-night.css">
</head>
<body>
<div class="reveal">
<!-- Used to fade in a background when a specific slide state is reached -->
<div class="state-background"></div>
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>Seamless iframes</h1>
<h3 class="inverted">The future, today!</h3>
<p class="note">Best viewed in Chrome version 22 or better (i.e. <a href="https://tools.google.com/dlpage/chromesxs/">Chrome Canary</a>)</p>
<script>
// Delicously hacky. Look away.
if( navigator.userAgent.match( /(iPhone|iPad|iPod|Android)/i ) ) document.write( '<p style="color: rgba(0,0,0,0.3); text-shadow: none;">('+'Tap to navigate'+')</p>' );
</script>
</section>
<section>
<h2>Who invited this guy</h2>
<ul>
<li>Ben Vinegar
<li>Totally legit lastname
<li>Front-end Engineer at Disqus
<li>Co-author, Third-party JavaScript
<li>@bentlegen
</section>
<section>
<h2 class="disqus">DISQUS</h2>
<ul>
<li>Distributed commenting platform
<li>Third-party JavaScript application
<li>Bloomberg, IGN, Time.com, MLB ... <a href="http://disqus.com/showcase">more</a>
<li>500 quadrillion pageviews per day
</section>
<section class="fullscreen">
<img src="assets/droid-life.png"/>
</section>
<section>
<h2>Re-written for 2012</h2>
<ul>
<li>Backbone.js + Ender
<li>LESS
<li>Uses the <a href="http://disqus.com/api/docs/">Disqus public API</a> (mostly)
<li>New: realtime streaming
<li class="fragment"><strong>Completely iframed</strong>
</section>
<section class="fullscreen">
<img src="assets/droid-life-iframe.png"/>
</section>
<section>
<h2>I know what you're thinking</h2>
<ul>
<li class="fragment">Dear god, not another 3D slide deck
<li class="fragment"><strong>Iframes, <em>srsly?</em></strong>
</section>
<section>
<h2>Iframes are great</h2>
<ul>
<li class="fragment">They're sandboxes
<li class="fragment">Avoid JavaScript conflicts
<pre><code class="javascript">Array.prototype.push = '(╯°□°）╯︵ ┻━┻';</code></pre>
<li class="fragment">More secure
<li class="fragment">Better privacy for users
</section>
<section>
<h2>Iframes are bad</h2>
<ul>
<li class="fragment">Don't inherit parent CSS rules
<pre><code>iframe body { font-family: "Comic Sans"; } /* LOL */</code></pre>
<li class="fragment">Hyperlinks navigate iframe, not parent
<li class="fragment">Don't expand to fit contents
</section>
<section>
<h2>Iframes are bad</h2>
<iframe src="armageddon.html"></iframe>
</section>
<section class="fullscreen">
<img src="assets/HTML5_Badge_512.png"/>
</section>
<section>
<h2>seamless attribute</h2>
<pre><code class="html" style="font-size:26px"><iframe seamless src="http://parent.com"></iframe></code></pre>
</section>
<section>
<h2>seamless attribute</h2>
<iframe seamless src="seamless-slide.html"></iframe>
<p class="note seamless-required">Your browser doesn't support seamless iframes.<br/> See <a href="https://github.com/benvinegar/seamless-talk#why-dont-the-slides-w-live-seamless-examples-work">README</a> for more information.</p>
</section>
<section>
<h2>Fantastic.</h2>
<img src="assets/orson.gif">
</section>
<section>
<h2>The cold, hard truth</h2>
<ul>
<li class="fragment"><span class="">seamless</span> is not implemented in any <em>stable</em> browser
<li class="fragment">Chrome 21.x and up (beta or canary)
<li class="fragment">http:// only – <em>not</em> file://
<li class="fragment">Other browsers have superficial implementation:
<pre style="font-size:26px"><code class="html">iframe[seamless]{
background-color: transparent;
border: 0px none transparent;
padding: 0px;
overflow: hidden;
}</code></pre>
</section>
<section>
<h2>Other browsers?</h2>
<ul>
<li class="fragment">You're boned.
<li class="fragment">Nah, just kidding. We can emulate seamless<br/> using JavaScript and esoteric HTML.
</section>
<section>
<h2>The plan</h2>
<ul>
<li>Two scripts:
<ul>
<li>JavaScript on the parent page
<li>JavaScript inside the iframed document
</ul>
<li class="fragment">Communication: <code>window.postMessage</code>
</section>
<section>
<h2>postMessage primer</h2>
<pre class="long"><code class="javascript">// Parent
var iframe = document.getElementById('the-iframe');
iframe.contentWindow.postMessage('sup', '*');
</code></pre>
<pre class="long"><code>// Iframe
window.parent.addEventListener('message', function (e) {
var data = e.data;
alert(data); // sup
}, false);</code></pre>
</section>
<section>
<h1>Relative<br/> links</h1>
</section>
<section>
<h2>Recall ….</h2>
<iframe src="armageddon.html"></iframe>
</section>
<section>
<h2>Relative links</h2>
<ul>
<li>Easy — use the target attribute
<pre><code><a href="http://example.com" target="_parent">!<a></code></pre>
<li class="fragment">Must be repeated for every link
<li class="fragment">Gets tired fast, error prone
</section>
<section>
<h2><base></h2>
<ul>
<li>Specifies base URL for all relative URLs
<li>HTML 4.01
<li>Goes in <head>
<li>Supports target attribute (_blank, _parent, etc.)
</section>
<section>
<h2><base></h2>
<pre><code class="html"><!DOCTYPE html> <!-- the iframe -->
<html>
<head>
<base href="http://parent.com/" target="_parent">
</head>
<body>
<a href="#boom"/>
<!-- becomes: http://parent.com/#boom -->
<a href="http://disqus.com"/>
<!-- unchanged, still opens in parent -->
</body>
</html></code></pre>
</section>
<section>
<h2>Referring URL</h2>
<ul>
<li>How do you obtain it?
<li class="fragment"><code>document.referrer</code> – not 100%
<li class="fragment">Better: <code>window.location</code> + <code>postMessage</code>
</section>
<section>
<h2>Referring URL</h2>
<pre class="long"><code class="javascript">// Parent
var iframe = document.getElementById('the-iframe');
iframe.contentWindow.postMessage(
['referrer', window.location.href], '*'
);</code></pre>
<pre class="long"><code class="javascript">// Iframe
window.parent.addEventListener('message', function (e) {
var eventName = e.data[0],
var data = e.data[1];
switch (eventName) {
case 'referrer': injectBaseElement(data); break;
...
}
}, false);</code></pre>
</section>
<section>
<h1>Inheriting<br/> styles</h1>
</section>
<section>
<h2>Inheriting styles</h2>
<ul>
<li>Many strategies …
<li class="fragment">Walk CSS tree and figure it out (read: no)
<li class="fragment">Inject predefined CSS into iframe
<li class="fragment"><em>Poor man's choice:</em> selective style detection using iframe parent element ✓
</section>
<section>
<h2>Detecting styles</h2>
<ul>
<li>Inject test elements as siblings of iframe element
<pre><code><div>
<a class="test"></a>
<span class="test"></span>
<iframe src="yerpage.html"></iframe>
</div></code></pre>
<li>Determine their style properties (font, colo<strong>u</strong>r, etc.)
<li>Pass into the iframe
</section>
<section>
<h2>Detecting styles</h2>
<pre class="long"><code>// Parent
function getIframeStyles(iframe) {
var $span = $('<span/>')
.appendTo(iframe.parentNode);
var styles = {
color: $span.css('color'),
fontFamily: $span.css('font-family'),
fontSize: $span.css('font-size')
...
};
$span.remove(); // Cleanup
return styles;
}
</code></pre>
</section>
<section>
<h2>Style injection</h2>
<pre class="long"><code>// Parent
var iframe = document.getElementById('the-iframe');
iframe.contentWindow.postMessage(
['styles', styles], '*'
);
</code></pre>
<pre class="long"><code>// Iframe
window.parent.addEventListener('message', function (e) {
var eventName = e.data[0];
var data = e.data[1];
switch (eventName) {
case 'styles': injectStyles(data); break;
case 'referrer': injectBaseElement(data); break;
...
}
}, false);</code></pre>
</section>
<section>
<h2>Style injection</h2>
<pre><code>// Iframe
function injectStyles(styles) {
$(document.body).css(styles);
}</code></pre>
</section>
<section>
<h1>Dynamic <br/>content</h1>
</section>
<section>
<h2>Dynamic resizing</h2>
<ul>
<li>Inside iframe, determine content height
<li>Use postMessage to send value to the parent
<li>Parent sets height on iframe element
<li class="fragment">If the DOM changes – start over
</section>
<section>
<h2>Fit to content</h2>
<pre class="long"><code class="javascript">// Iframe
function resize() {
var height = $(html).height();
// Backwards – send message to parent
window.parent.postMessage(['setHeight', height], '*');
}</code></pre>
<pre class="long"><code class="javascript">// Parent
window.addEventListener('message', function (e) {
var $iframe = $('#the-iframe');
var eventName = e.data[0];
var data = e.data[1];
switch (eventName) {
case 'setHeight':
$iframe.height(data);
break;
...
}
}, false);
</code></pre>
</section>
<section>
<h2>Detecting DOM changes</h2>
<ul>
<li>Mutation events – <em>deprecated</em> (and slow anyways)
<li class="fragment"><a href="https://developer.mozilla.org/en/DOM/DOM_Mutation_Observers">Mutation Observers</a> – DOM Level 4 (no time soon) <!-- Firefox 14 -->
<li class="fragment">setTimeout - check size on interval (slow)
<li class="fragment">If you want something done right …
</section>
<section>
<h2>DIY DOM change signals</h2>
<ul>
<li>Whenever you modify the DOM, resize the frame
<li class="fragment">Problem: querying content dimensions forces browser reflow
<li class="fragment">Translation: <em>every</em> DOM modification will cause a reflow
</section>
<section>
<h2>Debounce</h2>
<pre class="long"><code class="javascript">updateDom(function () {
$('#foo').append('<div>bar</div>');
});
updateDom(function () {
$('#baz').addClass('bigger');
});</code></pre>
<pre class="long"><code class="javascript">function updateDom(callback) {
callback();
resize();
}
// Fires resize function 50ms after *last* call
var resize = _.debounce(function () {
_resize();
}, 50);
</code></pre>
</section>
<section>
<h2>Debounce</h2>
<ul>
<li><em>One</em> reflow per set of uninterrupted DOM changes
<li>Debounce duration (50 ms) isn't noticeable
<li>Error prone – you can forget to use it
<li class="fragment">"It tastes awful, but it works"
</section>
<section>
<h2>The result</h2>
<ul>
<li>(Switch to hastily written demo)
</section>
<section>
<h1>Thanks.</h1>
<ul>
<li>@bentlegen
<li>Demos & slides: <a href="http://github.com/benvinegar">github.com/benvinegar</a>
<li>Book: <a href="http://manning.com/vinegar">Third-party JavaScript (Manning)</a>
<li>More: <a href="http://weblog.bocoup.com/third-party-javascript-development-future/">Third-party JS Development: The Future!</a><br/><span style="float:right;font-size:0.8em;">– Mike Pennisi (Bocoup)</span>
</section>
</div>
<!-- The navigational controls UI -->
<aside class="controls">
<a class="left" href="#">◄</a>
<a class="right" href="#">►</a>
<a class="up" href="#">▲</a>
<a class="down" href="#">▼</a>
</aside>
<!-- Displays presentation progress, max value changes via JS to reflect # of slides -->
<div class="progress"><span></span></div>
</div>
<!-- Optional libraries for code syntax highlighting and classList support in IE9 -->
<script src="lib/highlight.js"></script>
<script src="lib/classList.js"></script>
<script src="js/reveal.js"></script>
<script>
// Make every <code> element contentEditable - this is so I can live
// edit code during a presentation
;(function() {
var pre = Array.prototype.slice.call(document.getElementsByTagName('code'));
pre.forEach(function (p) {
p.setAttribute('contenteditable', 'true');
});
})();
;(function () {
var iframe = document.createElement('iframe');
if (iframe.seamless === undefined)
document.body.className = 'no-seamless';
})();
</script>
<script>
// Parse the query string into a key/value object
var query = {};
location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
} );
// Fires when a slide with data-state=customevent is activated
Reveal.addEventListener( 'customevent', function() {
alert( '"customevent" has fired' );
} );
// Fires each time a new slide is activated
Reveal.addEventListener( 'slidechanged', function( event ) {
// event.previousSlide, event.currentSlide, event.indexh, event.indexv
} );
Reveal.initialize({
// Display controls in the bottom right corner
controls: true,
// Display a presentation progress bar
progress: true,
// If true; each slide will be pushed to the browser history
history: true,
// Loops the presentation, defaults to false
loop: false,
// Flags if mouse wheel navigation should be enabled
mouseWheel: true,
// Apply a 3D roll to links on hover
rollingLinks: true,
// UI style
theme: query.theme || 'default', // default/neon
// Transition style
transition: query.transition || 'default' // default/cube/page/concave/linear(2d)
});
hljs.initHighlightingOnLoad();
</script>
</body>
</html>