iframe background preload behavior now matches inline iframes + adheres to the new 'preloadIframes' config option
Hakim El Hattab
parent
a16b71a981
commit
1766e37a63
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@ -778,6 +778,8 @@ Embeds a web page as a slide background that covers 100% of the reveal.js width
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</section>
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```
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Iframes are lazy-loaded when they become visible. If you'd like to preload iframes aehad of time, you can append a `data-preload` attribute to the slide `<section>`. You can also enable preloading globally for all iframes using the `preloadIframes` configuration option.
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#### Background Transitions
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Backgrounds transition using a fade animation by default. This can be changed to a linear sliding transition by passing `backgroundTransition: 'slide'` to the `Reveal.initialize()` call. Alternatively you can set `data-background-transition` on any section with a background to override that specific transition.
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33
js/reveal.js
33
js/reveal.js
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@ -1217,6 +1217,8 @@
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if( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;
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if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
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if( slide.hasAttribute( 'data-preload' ) ) element.setAttribute( 'data-preload', '' );
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// Background image options are set on the content wrapper
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if( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;
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if( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;
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@ -3625,7 +3627,7 @@
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// Stop content inside of previous backgrounds
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if( previousBackground ) {
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stopEmbeddedContent( previousBackground );
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stopEmbeddedContent( previousBackground, { unloadIframes: !shouldPreload( previousBackground ) } );
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}
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@ -3804,6 +3806,7 @@
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background.style.display = 'block';
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var backgroundContent = slide.slideBackgroundContentElement;
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var backgroundIframe = slide.getAttribute( 'data-background-iframe' );
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// If the background contains media, load it
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if( background.hasAttribute( 'data-loaded' ) === false ) {
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@ -3812,8 +3815,7 @@
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var backgroundImage = slide.getAttribute( 'data-background-image' ),
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backgroundVideo = slide.getAttribute( 'data-background-video' ),
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backgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),
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backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' ),
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backgroundIframe = slide.getAttribute( 'data-background-iframe' );
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backgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );
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// Images
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if( backgroundImage ) {
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@ -3854,14 +3856,7 @@
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iframe.setAttribute( 'mozallowfullscreen', '' );
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iframe.setAttribute( 'webkitallowfullscreen', '' );
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// Only load autoplaying content when the slide is shown to
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// avoid having it play in the background
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if( /autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
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iframe.setAttribute( 'data-src', backgroundIframe );
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}
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else {
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iframe.setAttribute( 'src', backgroundIframe );
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}
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iframe.style.width = '100%';
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iframe.style.height = '100%';
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@ -3872,6 +3867,19 @@
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}
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}
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// Start loading preloadable iframes
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var backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );
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if( backgroundIframeElement ) {
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// Check if this iframe is eligible to be preloaded
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if( shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {
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if( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {
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backgroundIframeElement.setAttribute( 'src', backgroundIframe );
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}
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}
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}
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}
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}
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@ -3891,6 +3899,11 @@
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var background = getSlideBackground( slide );
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if( background ) {
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background.style.display = 'none';
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// Unload any background iframes
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toArray( background.querySelectorAll( 'iframe[src]' ) ).forEach( function( element ) {
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element.removeAttribute( 'src' );
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} );
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}
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// Reset lazy-loaded media elements with src attributes
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@ -0,0 +1,104 @@
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>reveal.js - Test Iframe Backgrounds</title>
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<link rel="stylesheet" href="../css/reveal.css">
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<link rel="stylesheet" href="qunit-2.5.0.css">
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</head>
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<body style="overflow: auto;">
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<div id="qunit"></div>
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<div id="qunit-fixture"></div>
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<div class="reveal" style="display: none;">
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<div class="slides">
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<section data-background-iframe="#1">1</section>
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<section data-background-iframe="#2">2</section>
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<section data-background-iframe="#3" data-preload>3</section>
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<section data-background-iframe="#4">4</section>
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<section data-background-iframe="#5">5</section>
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<section data-background-iframe="#6">6</section>
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</div>
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</div>
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<script src="../js/reveal.js"></script>
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<script src="qunit-2.5.0.js"></script>
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<script>
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Reveal.addEventListener( 'ready', function() {
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function getIframe( index ) {
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return document.querySelectorAll( '.slide-background' )[index].querySelector( 'iframe' );
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}
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QUnit.module( 'Iframe' );
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QUnit.test( 'Using default settings', function( assert ) {
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Reveal.slide(0);
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assert.strictEqual( getIframe(1).hasAttribute( 'src' ), false, 'not preloaded when within viewDistance' );
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Reveal.slide(1);
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assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
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Reveal.slide(0);
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assert.strictEqual( getIframe(1).hasAttribute( 'src' ), false, 'unloaded when slide becomes invisible' );
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});
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QUnit.test( 'Using data-preload', function( assert ) {
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Reveal.slide(1);
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assert.strictEqual( getIframe(2).hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
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assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
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Reveal.slide(0);
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assert.strictEqual( getIframe(3).hasAttribute( 'src' ), false, 'unloads outside of viewDistance' );
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});
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QUnit.test( 'Using preloadIframes: true', function( assert ) {
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Reveal.configure({ preloadIframes: true });
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Reveal.slide(1);
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assert.strictEqual( getIframe(0).hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
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assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
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assert.strictEqual( getIframe(2).hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
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});
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QUnit.test( 'Using preloadIframes: false', function( assert ) {
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Reveal.configure({ preloadIframes: false });
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Reveal.slide(0);
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assert.strictEqual( getIframe(1).hasAttribute( 'src' ), false, 'not preloaded within viewDistance' );
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assert.strictEqual( getIframe(2).hasAttribute( 'src' ), false, 'not preloaded within viewDistance' );
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Reveal.slide(1);
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assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
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});
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} );
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Reveal.initialize({
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viewDistance: 3
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});
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</script>
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</body>
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</html>
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