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add data-fragment=<index> attribute to slide <sections>

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This commit is contained in:
Hakim El Hattab 2020-01-15 11:37:37 +01:00
parent 76187bc666
commit ac50753521
2 changed files with 27 additions and 0 deletions
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11
js/reveal.js
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@ -4751,6 +4751,8 @@
if( fragments.length ) { if( fragments.length ) {
var maxIndex = 0;
if( typeof index !== 'number' ) { if( typeof index !== 'number' ) {
var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop(); var currentFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();
if( currentFragment ) { if( currentFragment ) {
@ -4764,6 +4766,8 @@
i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 ); i = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );
} }
maxIndex = Math.max( maxIndex, i );
// Visible fragments // Visible fragments
if( i <= index ) { if( i <= index ) {
if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el ); if( !el.classList.contains( 'visible' ) ) changedFragments.shown.push( el );
@ -4787,6 +4791,13 @@
} ); } );
// Write the current fragment index to the slide <section>.
// This can be used by end users to apply styles based on
// the current fragment index.
index = typeof index === 'number' ? index : -1;
index = Math.max( Math.min( index, maxIndex ), -1 );
currentSlide.setAttribute( 'data-fragment', index );
} }
} }

16
test/test.js
View file

@ -250,6 +250,22 @@ Reveal.addEventListener( 'ready', function() {
assert.deepEqual( Reveal.getIndices(), { h: 2, v: 0, f: 1 }, 'Reveal.slide( 2, 0, 1 )' ); assert.deepEqual( Reveal.getIndices(), { h: 2, v: 0, f: 1 }, 'Reveal.slide( 2, 0, 1 )' );
}); });
QUnit.test( 'data-fragment is set on slide <section>', function( assert ) {
Reveal.slide( 2, 0, -1 );
assert.deepEqual( Reveal.getCurrentSlide().getAttribute( 'data-fragment' ), '-1' );
Reveal.slide( 2, 0, 2 );
assert.deepEqual( Reveal.getCurrentSlide().getAttribute( 'data-fragment' ), '2' );
Reveal.slide( 2, 0, 0 );
assert.deepEqual( Reveal.getCurrentSlide().getAttribute( 'data-fragment' ), '0' );
var fragmentSlide = Reveal.getCurrentSlide();
Reveal.slide( 3, 0 );
assert.deepEqual( fragmentSlide.getAttribute( 'data-fragment' ), '0', 'data-fragment persists when jumping to another slide' );
});
QUnit.test( 'Hiding all fragments', function( assert ) { QUnit.test( 'Hiding all fragments', function( assert ) {
var fragmentSlide = document.querySelector( '#fragment-slides>section:nth-child(1)' ); var fragmentSlide = document.querySelector( '#fragment-slides>section:nth-child(1)' );