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tweaks and tests for #2354

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This commit is contained in:
Hakim El Hattab 2019-03-28 15:42:28 +01:00
parent 6faab091bb
commit d6f0f41f77
3 changed files with 123 additions and 26 deletions
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39
js/reveal.js
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@ -180,6 +180,13 @@
// - false: No media will autoplay, regardless of individual setting
autoPlayMedia: null,
// Global override for preloading lazy-loaded iframes
// - null: Iframes with data-src AND data-preload will be loaded when within
// the viewDistance, iframes with only data-src will be loaded when visible
// - true: All iframes with data-src will be loaded when within the viewDistance
// - false: All iframes with data-src will be loaded only when visible
preloadIframes: null,
// Controls automatic progression to the next slide
// - 0: Auto-sliding only happens if the data-autoslide HTML attribute
// is present on the current slide or fragment
@ -3677,7 +3684,7 @@
*
* @param {HTMLElement} element
*/
function shouldPreload(element) {
function shouldPreload( element ) {
// Prefer an explicit global preload setting
var preload = config.preloadIframes;
@ -3707,18 +3714,10 @@
// Media elements with data-src attributes
toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
var load = function( el ) {
el.setAttribute( 'src', el.getAttribute( 'data-src' ) );
el.setAttribute( 'data-lazy-loaded', '' );
el.removeAttribute( 'data-src' );
};
if( element.tagName === 'IFRAME') {
if( shouldPreload(element) ) {
load(element);
}
} else {
load(element);
if( element.tagName !== 'IFRAME' || shouldPreload( element ) ) {
element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
element.setAttribute( 'data-lazy-loaded', '' );
element.removeAttribute( 'data-src' );
}
} );
@ -3838,18 +3837,8 @@
// Reset lazy-loaded media elements with src attributes
toArray( slide.querySelectorAll( 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ) ).forEach( function( element ) {
var unload = function( el ) {
el.setAttribute( 'data-src', el.getAttribute( 'src' ) );
el.removeAttribute( 'src' );
};
if( element.tagName === 'IFRAME' ) {
if( shouldPreload(element) ) {
unload(element);
}
} else {
unload(element);
}
element.setAttribute( 'data-src', element.getAttribute( 'src' ) );
element.removeAttribute( 'src' );
} );
// Reset lazy-loaded media elements with <source> children

108
test/test-iframes.html Normal file
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@ -0,0 +1,108 @@
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>reveal.js - Test Iframes</title>
<link rel="stylesheet" href="../css/reveal.css">
<link rel="stylesheet" href="qunit-2.5.0.css">
</head>
<body style="overflow: auto;">
<div id="qunit"></div>
<div id="qunit-fixture"></div>
<div class="reveal" style="display: none;">
<div class="slides">
<section>1</section>
<section>2</section>
<section>
<iframe class="default-iframe" data-src="#"></iframe>
<iframe class="preload-iframe" data-src="#" data-preload></iframe>
</section>
</div>
</div>
<script src="../js/reveal.js"></script>
<script src="qunit-2.5.0.js"></script>
<script>
Reveal.addEventListener( 'ready', function() {
var defaultIframe = document.querySelector( '.default-iframe' ),
preloadIframe = document.querySelector( '.preload-iframe' );
QUnit.module( 'Iframe' );
QUnit.test( 'Using default settings', function( assert ) {
Reveal.slide(1);
assert.strictEqual( defaultIframe.hasAttribute( 'src' ), false, 'not preloaded when within viewDistance' );
Reveal.slide(2);
assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
Reveal.slide(1);
assert.strictEqual( defaultIframe.hasAttribute( 'src' ), false, 'unloaded when slide becomes invisible' );
});
QUnit.test( 'Using data-preload', function( assert ) {
Reveal.slide(1);
assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
Reveal.slide(2);
assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'loaded when slide becoems visible' );
Reveal.slide(0);
assert.strictEqual( preloadIframe.hasAttribute( 'src' ), false, 'unloads outside of viewDistance' );
});
QUnit.test( 'Using preloadIframes: true', function( assert ) {
Reveal.configure({ preloadIframes: true });
Reveal.slide(1);
assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'preloaded within viewDistance' );
Reveal.slide(2);
assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
});
QUnit.test( 'Using preloadIframes: false', function( assert ) {
Reveal.configure({ preloadIframes: false });
Reveal.slide(0);
assert.strictEqual( defaultIframe.hasAttribute( 'src' ), false, 'not preloaded within viewDistance' );
assert.strictEqual( preloadIframe.hasAttribute( 'src' ), false, 'not preloaded within viewDistance' );
Reveal.slide(2);
assert.strictEqual( defaultIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
assert.strictEqual( preloadIframe.hasAttribute( 'src' ), true, 'loaded when slide becomes visible' );
});
} );
Reveal.initialize({
viewDistance: 2
});
</script>
</body>
</html>