User:Prtksxna/ptoc.js

mw.loader.using( 'jquery.throttle-debounce', function {	$( function  { var $window, $mwPanel, $floatTOC, scrollHandler, tocLimit, headingOffsets, headingThreshold, $toc = $( '#toc' );

if ( !$toc.length ) { return; }

$window = $( window ); $mwPanel = $( '#mw-panel' ); headingThreshold = $window.height / 5.0; $floatTOC = $toc .clone .removeAttr( 'id' ) .addClass( 'floatTOC' ) .appendTo( 'body' ) .css( {				visibility: 'hidden',				opacity: 0			} );

// Show the ToC ul even if its hidden $floatTOC.find( 'ul' ).show;

// Hijack links so that we can scroll to the content $floatTOC.find( 'a' ).click( function ( e ) {			$( 'html, body' ).animate( { scrollTop: $( $( this ).attr( 'href' ) ).offset.top - headingThreshold } );			return false;		} );

tocLimit = $toc.offset.top + $toc.height; headingOffsets = [];

// Get all heading positions $('.mw-headline').each( function {			headingOffsets.push( [ $( this ).attr( 'id' ), $( this ).offset.top ] );		} );

// For the window scroll event scrollHandler = function { var $current, scrollTop = $window.scrollTop;

if ( scrollTop > tocLimit ) { $floatTOC.css( {					visibility: 'visible',					opacity: 1				} ); $mwPanel.hide;

// Highlight current var highlight = false; // Current section is above the first heading below the top of the screen $.each( headingOffsets, function ( i, v ) {					// Skip first as there's no previous heading before the first					if ( i !== 0 && ( scrollTop + headingThreshold ) < v[ 1 ] ) {						highlight = headingOffsets[ i - 1 ][ 0 ];						return false;					}				} );

if ( highlight ) { $current = $floatTOC.find( 'a[href="#' + highlight + '"]' ); $floatTOC.find( 'a' ).not( $current ).css( 'font-weight', '' ); $current.css( 'font-weight', 'bold' ); }

} else { $floatTOC.css( {					visibility: 'hidden',					opacity: 0				} ); $mwPanel.show; }		}

$window.on( 'scroll', $.throttle( 250, scrollHandler ) ); } ); } );