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| author | Hakim El Hattab <hakim.elhattab@gmail.com> | 2014-04-28 12:31:34 +0200 |
|---|---|---|
| committer | Hakim El Hattab <hakim.elhattab@gmail.com> | 2014-04-28 12:31:34 +0200 |
| commit | fbf999ec8125980f5dde6c20c056c6ad9cf245a7 (patch) | |
| tree | 0b7808e3279afab93f1718c1a821f932e94d343b /js | |
| parent | 1391253cb815e36e6956553791f3a25f74923c95 (diff) | |
| download | fosdem-2018-presentation-fbf999ec8125980f5dde6c20c056c6ad9cf245a7.tar fosdem-2018-presentation-fbf999ec8125980f5dde6c20c056c6ad9cf245a7.tar.gz | |
null check background
Diffstat (limited to 'js')
| -rw-r--r-- | js/reveal.js | 42 |
1 files changed, 23 insertions, 19 deletions
diff --git a/js/reveal.js b/js/reveal.js index df1b1f5..aefb514 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -2326,29 +2326,31 @@ // Show the corresponding background element var indices = getIndices( slide ); var background = getSlideBackground( indices.h, indices.v ); - background.style.display = 'block'; + if( background ) { + background.style.display = 'block'; - // If the background contains media, load it - if( background.hasAttribute( 'data-loaded' ) === false ) { - background.setAttribute( 'data-loaded', 'true' ); + // If the background contains media, load it + if( background.hasAttribute( 'data-loaded' ) === false ) { + background.setAttribute( 'data-loaded', 'true' ); - var backgroundImage = slide.getAttribute( 'data-background-image' ), - backgroundVideo = slide.getAttribute( 'data-background-video' ); + var backgroundImage = slide.getAttribute( 'data-background-image' ), + backgroundVideo = slide.getAttribute( 'data-background-video' ); - // Images - if( backgroundImage ) { - background.style.backgroundImage = 'url('+ backgroundImage +')'; - } - // Videos - else if ( backgroundVideo ) { - var video = document.createElement( 'video' ); + // Images + if( backgroundImage ) { + background.style.backgroundImage = 'url('+ backgroundImage +')'; + } + // Videos + else if ( backgroundVideo ) { + var video = document.createElement( 'video' ); - // Support comma separated lists of video sources - backgroundVideo.split( ',' ).forEach( function( source ) { - video.innerHTML += '<source src="'+ source +'">'; - } ); + // Support comma separated lists of video sources + backgroundVideo.split( ',' ).forEach( function( source ) { + video.innerHTML += '<source src="'+ source +'">'; + } ); - background.appendChild( video ); + background.appendChild( video ); + } } } @@ -2366,7 +2368,9 @@ // Hide the corresponding background element var indices = getIndices( slide ); var background = getSlideBackground( indices.h, indices.v ); - background.style.display = 'none'; + if( background ) { + background.style.display = 'none'; + } } |