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Fixes bad NaN applied to style on updateParallax.

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The previous criteria "verticalSlideCount > 0" would result
in verticalOffset being NaN when verticalSlideCount == 1.

This would cause dom.background.style.backgroundPosition to
be set to something like "123px NaNpx", ultimately preventing
the parallax effect to play (silently failing so far).
This commit is contained in:
Cristiano Cortezia 2014-01-16 14:44:32 -02:00 committed by Cristiano Cortezia
parent 8b8cc607d4
commit d9513b34d5
1 changed files with 1 additions and 1 deletions
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js/reveal.js
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@ -2032,7 +2032,7 @@ var Reveal = (function(){
var slideHeight = dom.background.offsetHeight; var slideHeight = dom.background.offsetHeight;
var verticalSlideCount = verticalSlides.length; var verticalSlideCount = verticalSlides.length;
var verticalOffset = verticalSlideCount > 0 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0; var verticalOffset = verticalSlideCount > 1 ? -( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 ) * indexv : 0;
dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px'; dom.background.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';