function navigateFragment()

in js/reveal.js [4725:4774]

• 33 lines of code
• 12 McCabe index (conditional complexity)

	function navigateFragment( index, offset ) {

		if( currentSlide && config.fragments ) {

			var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
			if( fragments.length ) {

				// If no index is specified, find the current
				if( typeof index !== 'number' ) {
					var lastVisibleFragment = sortFragments( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();

					if( lastVisibleFragment ) {
						index = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );
					}
					else {
						index = -1;
					}
				}

				// If an offset is specified, apply it to the index
				if( typeof offset === 'number' ) {
					index += offset;
				}

				var changedFragments = updateFragments( index, fragments );

				if( changedFragments.hidden.length ) {
					dispatchEvent( 'fragmenthidden', { fragment: changedFragments.hidden[0], fragments: changedFragments.hidden } );
				}

				if( changedFragments.shown.length ) {
					dispatchEvent( 'fragmentshown', { fragment: changedFragments.shown[0], fragments: changedFragments.shown } );
				}

				updateControls();
				updateProgress();

				if( config.fragmentInURL ) {
					writeURL();
				}

				return !!( changedFragments.shown.length || changedFragments.hidden.length );

			}

		}

		return false;

	}