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MediaWiki:Gadget-SidebarTOC.js
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mw.loader.using( 'mediawiki.toc', function () {
$( function () {
var $window, $floatTOC, scrollHandler,
tocLimit, headingOffsets, headingThreshold,
$toc = $( '.toc' );
if ( !$toc.length ) {
return;
}
$window = $( window );
headingThreshold = $window.height() / 5.0;
$floatTOC = $toc
.clone()
.removeAttr( 'id' )
.addClass( 'floatTOC' )
.appendTo( '.vector-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.hash.replace( /\./g, '\\.' ) ).offset().top - headingThreshold
} );
return false;
} );
tocLimit = $toc.offset().top + $toc.height();
headingOffsets = [];
// Get all heading positions
$toc.find('a').each(function () {
var href = $(this).attr('href');
if (href && href.charAt(0) === '#') {
var id = href.substring(1);
var $heading = $('#' + id);
if ($heading.length) {
headingOffsets.push([$heading, $heading.offset().top]);
}
}
});
// For the window scroll event
scrollHandler = function () {
var $current,
scrollTop = $window.scrollTop();
if (scrollTop > tocLimit) {
$floatTOC.css({
visibility: 'visible',
opacity: 1
});
// Highlight current
var highlight = false;
// Current section is above the first heading below the top of the screen
$.each(headingOffsets, function (i, v) {
if (i !== 0 && (scrollTop + headingThreshold) < v[1]) {
highlight = headingOffsets[i - 1][0].attr('id');
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
});
}
};
$window.on('scroll', $.throttle(250, scrollHandler));
});
});