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lazy-load iframes only for current slide, unload when hidden

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This commit is contained in:
Hakim El Hattab
2015-05-04 20:58:58 -04:00
parent 152271efb2
commit 7dd33f188f
4 changed files with 28 additions and 8 deletions
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24
js/reveal.js
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@ -2723,7 +2723,7 @@
slide.style.display = 'block';
// Media elements with data-src attributes
toArray( slide.querySelectorAll( 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ) ).forEach( function( element ) {
toArray( slide.querySelectorAll( 'img[data-src]', 'video[data-src]', 'audio[data-src]' ) ).forEach( function( element ) {
element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
element.removeAttribute( 'data-src' );
} );
@ -2909,19 +2909,24 @@
}
} );
// iframe embeds
// Lazy loading iframes
toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( element ) {
element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
} );
// Generic postMessage API for non-lazy loaded iframes
toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
el.contentWindow.postMessage( 'slide:start', '*' );
});
// YouTube embeds
// YouTube postMessage API
toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
if( el.hasAttribute( 'data-autoplay' ) ) {
el.contentWindow.postMessage( '{"event":"command","func":"playVideo","args":""}', '*' );
}
});
// Vimeo embeds
// Vimeo postMessage API
toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
if( el.hasAttribute( 'data-autoplay' ) ) {
el.contentWindow.postMessage( '{"method":"play"}', '*' );
@ -2945,19 +2950,24 @@
}
} );
// iframe embeds
// Lazy loading iframes
toArray( slide.querySelectorAll( 'iframe[data-src]' ) ).forEach( function( element ) {
element.removeAttribute( 'src' );
} );
// Generic postMessage API for non-lazy loaded iframes
toArray( slide.querySelectorAll( 'iframe' ) ).forEach( function( el ) {
el.contentWindow.postMessage( 'slide:stop', '*' );
});
// YouTube embeds
// YouTube postMessage API
toArray( slide.querySelectorAll( 'iframe[src*="youtube.com/embed/"]' ) ).forEach( function( el ) {
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
el.contentWindow.postMessage( '{"event":"command","func":"pauseVideo","args":""}', '*' );
}
});
// Vimeo embeds
// Vimeo postMessage API
toArray( slide.querySelectorAll( 'iframe[src*="player.vimeo.com/"]' ) ).forEach( function( el ) {
if( !el.hasAttribute( 'data-ignore' ) && typeof el.contentWindow.postMessage === 'function' ) {
el.contentWindow.postMessage( '{"method":"pause"}', '*' );