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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