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null computed style to avoid npe

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This commit is contained in:
Hakim El Hattab 2016-07-04 14:46:46 +02:00
parent ab2bb869a3
commit 304b0292be
1 changed files with 4 additions and 4 deletions
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8
js/reveal.js
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@ -855,15 +855,15 @@
// If this slide has a background color, add a class that // If this slide has a background color, add a class that
// signals if it is light or dark. If the slide has no background // signals if it is light or dark. If the slide has no background
// color, no class will be set // color, no class will be set
var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor; var computedBackgroundStyle = window.getComputedStyle( element );
if( computedBackgroundColor ) { if( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {
var rgb = colorToRgb( computedBackgroundColor ); var rgb = colorToRgb( computedBackgroundStyle.backgroundColor );
// Ignore fully transparent backgrounds. Some browsers return // Ignore fully transparent backgrounds. Some browsers return
// rgba(0,0,0,0) when reading the computed background color of // rgba(0,0,0,0) when reading the computed background color of
// an element with no background // an element with no background
if( rgb && rgb.a !== 0 ) { if( rgb && rgb.a !== 0 ) {
if( colorBrightness( computedBackgroundColor ) < 128 ) { if( colorBrightness( computedBackgroundStyle.backgroundColor ) < 128 ) {
slide.classList.add( 'has-dark-background' ); slide.classList.add( 'has-dark-background' );
} }
else { else {