null check background
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js/reveal.js
42
js/reveal.js
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@ -2326,29 +2326,31 @@
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// Show the corresponding background element
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var indices = getIndices( slide );
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var background = getSlideBackground( indices.h, indices.v );
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background.style.display = 'block';
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if( background ) {
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background.style.display = 'block';
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// If the background contains media, load it
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if( background.hasAttribute( 'data-loaded' ) === false ) {
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background.setAttribute( 'data-loaded', 'true' );
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// If the background contains media, load it
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if( background.hasAttribute( 'data-loaded' ) === false ) {
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background.setAttribute( 'data-loaded', 'true' );
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var backgroundImage = slide.getAttribute( 'data-background-image' ),
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backgroundVideo = slide.getAttribute( 'data-background-video' );
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var backgroundImage = slide.getAttribute( 'data-background-image' ),
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backgroundVideo = slide.getAttribute( 'data-background-video' );
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// Images
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if( backgroundImage ) {
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background.style.backgroundImage = 'url('+ backgroundImage +')';
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}
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// Videos
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else if ( backgroundVideo ) {
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var video = document.createElement( 'video' );
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// Images
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if( backgroundImage ) {
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background.style.backgroundImage = 'url('+ backgroundImage +')';
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}
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// Videos
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else if ( backgroundVideo ) {
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var video = document.createElement( 'video' );
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// Support comma separated lists of video sources
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backgroundVideo.split( ',' ).forEach( function( source ) {
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video.innerHTML += '<source src="'+ source +'">';
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} );
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// Support comma separated lists of video sources
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backgroundVideo.split( ',' ).forEach( function( source ) {
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video.innerHTML += '<source src="'+ source +'">';
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} );
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background.appendChild( video );
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background.appendChild( video );
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}
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}
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}
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@ -2366,7 +2368,9 @@
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// Hide the corresponding background element
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var indices = getIndices( slide );
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var background = getSlideBackground( indices.h, indices.v );
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background.style.display = 'none';
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if( background ) {
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background.style.display = 'none';
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}
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}
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