diff options
Diffstat (limited to 'js/reveal.js')
| -rw-r--r-- | js/reveal.js | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/js/reveal.js b/js/reveal.js index 600a763..e6368d6 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -615,15 +615,20 @@ var Reveal = (function(){ if( config.focusBodyOnPageVisiblityChange ) { var visibilityChange; - if ('hidden' in document) { + + if( 'hidden' in document ) { visibilityChange = 'visibilitychange'; - } else if ('msHidden' in document) { + } + else if( 'msHidden' in document ) { visibilityChange = 'msvisibilitychange'; - } else if ('webkitHidden' in document) { + } + else if( 'webkitHidden' in document ) { visibilityChange = 'webkitvisibilitychange'; } - document.addEventListener(visibilityChange, onPageVisibilityChange, false); + if( visibilityChange ) { + document.addEventListener( visibilityChange, onPageVisibilityChange, false ); + } } [ 'touchstart', 'click' ].forEach( function( eventName ) { |