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@@ -1467,13 +1467,23 @@ export default function( revealElement, options ) {
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/**
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* Randomly shuffles all slides in the deck.
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*/
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- function shuffle() {
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+ function shuffle( slides = getHorizontalSlides() ) {
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- getHorizontalSlides().forEach( ( slide, i, slides ) => {
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+ slides.forEach( ( slide, i ) => {
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- // Insert this slide next to another random slide. This may
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- // cause the slide to insert before itself but that's fine.
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- dom.slides.insertBefore( slide, slides[ Math.floor( Math.random() * slides.length ) ] );
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+ // Insert the slide next to a randomly picked sibling slide
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+ // slide. This may cause the slide to insert before itself,
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+ // but that's not an issue.
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+ let beforeSlide = slides[ Math.floor( Math.random() * slides.length ) ];
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+ if( beforeSlide.parentNode === slide.parentNode ) {
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+ slide.parentNode.insertBefore( slide, beforeSlide );
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+ }
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+
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+ // Randomize the order of vertical slides (if there are any)
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+ let verticalSlides = slide.querySelectorAll( 'section' );
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+ if( verticalSlides.length ) {
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+ shuffle( verticalSlides );
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+ }
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} );
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Hakim El Hattab