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-rw-r--r--js/reveal.js39
1 files changed, 14 insertions, 25 deletions
diff --git a/js/reveal.js b/js/reveal.js
index de12ed7..0437d2d 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -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