diff options
Diffstat (limited to 'js/reveal.js')
| -rw-r--r-- | js/reveal.js | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/js/reveal.js b/js/reveal.js index 65ba58d..664fc90 100644 --- a/js/reveal.js +++ b/js/reveal.js @@ -718,7 +718,7 @@ var Reveal = (function(){ */ function setPreviousVerticalIndex( stack, v ) { - if( stack ) { + if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) { stack.setAttribute( 'data-previous-indexv', v || 0 ); } @@ -733,7 +733,7 @@ var Reveal = (function(){ */ function getPreviousVerticalIndex( stack ) { - if( stack && stack.classList.contains( 'stack' ) ) { + if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) { return parseInt( stack.getAttribute( 'data-previous-indexv' ) || 0, 10 ); } |