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images with data-src attribute are now lazy-loaded #793

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This commit is contained in:
Hakim El Hattab
2014-04-22 15:41:08 +02:00
parent 5d39b5eabf
commit 343765b7ab
2 changed files with 37 additions and 7 deletions
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34
js/reveal.js
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@ -1905,6 +1905,11 @@ var Reveal = (function(){
viewDistance = isOverview() ? 6 : 1;
}
// Limit view distance on weaker devices
if( isPrintingPDF() ) {
viewDistance = Number.MAX_VALUE;
}
for( var x = 0; x < horizontalSlidesLength; x++ ) {
var horizontalSlide = horizontalSlides[x];
@ -1915,7 +1920,13 @@ var Reveal = (function(){
distanceX = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
// Show the horizontal slide if it's within the view distance
horizontalSlide.style.display = distanceX > viewDistance ? 'none' : 'block';
if( distanceX < viewDistance ) {
horizontalSlide.style.display = 'block';
loadSlide( horizontalSlide );
}
else {
horizontalSlide.style.display = 'none';
}
if( verticalSlidesLength ) {
@ -1926,7 +1937,13 @@ var Reveal = (function(){
distanceY = x === indexh ? Math.abs( indexv - y ) : Math.abs( y - oy );
verticalSlide.style.display = ( distanceX + distanceY ) > viewDistance ? 'none' : 'block';
if( distanceX + distanceY < viewDistance ) {
verticalSlide.style.display = 'block';
loadSlide( verticalSlide );
}
else {
verticalSlide.style.display = 'none';
}
}
}
@ -2149,6 +2166,19 @@ var Reveal = (function(){
}
/**
* Loads any content that is set to load lazily (data-src)
* inside of the given slide.
*/
function loadSlide( slide ) {
toArray( slide.querySelectorAll( 'img[data-src]' ) ).forEach( function( element ) {
element.setAttribute( 'src', element.getAttribute( 'data-src' ) );
element.removeAttribute( 'data-src' );
} );
}
/**
* Determine what available routes there are for navigation.
*