wp-theme/ascribe/assets/_src/js/vendor/toc.js

/*!
 * toc - jQuery Table of Contents Plugin
 * v0.3.2
 * http://projects.jga.me/toc/
 * copyright Greg Allen 2014
 * MIT License
 */
/*!
 * smooth-scroller - Javascript lib to handle smooth scrolling
 * v0.1.2
 * https://github.com/firstandthird/smooth-scroller
 * copyright First+Third 2014
 * MIT License
 */
//smooth-scroller.js

(function($) {
    $.fn.smoothScroller = function(options) {
        options = $.extend({}, $.fn.smoothScroller.defaults, options);
        var el = $(this);

        $(options.scrollEl).animate({
            scrollTop: el.offset().top - $(options.scrollEl).offset().top - options.offset
        }, options.speed, options.ease, function() {
            var hash = el.attr('id');

            if (hash.length) {
                document.location.hash = hash;
            }

            el.trigger('smoothScrollerComplete');
        });

        return this;
    };

    $.fn.smoothScroller.defaults = {
        speed: 400,
        ease: 'swing',
        scrollEl: 'body,html',
        offset: 0
    };

    $('body').on('click', '[data-smoothscroller]', function(e) {
        e.preventDefault();
        var href = $(this).attr('href');

        if (href.indexOf('#') === 0) {
            $(href).smoothScroller();
        }
    });
}(jQuery));

(function($) {
    var verboseIdCache = {};
    $.fn.toc = function(options) {
        var self = this;
        var opts = $.extend({}, jQuery.fn.toc.defaults, options);

        var container = $(opts.container);
        var headings = $(opts.selectors, container);
        var activeClassName = opts.activeClass;

        var headingOffsets = function() {
            var offsets = [];
            headings.each(function(i, heading) {
                var $h = $(heading);
                offsets.push($h.offset().top - opts.highlightOffset);
            });
            return offsets;
        };

        var scrollTo = function(e, callback) {
            if (opts.smoothScrolling && typeof opts.smoothScrolling === 'function') {
                e.preventDefault();
                var elScrollTo = $(e.target).attr('href');

                opts.smoothScrolling(elScrollTo, opts, callback);
            }
            $('li', self).removeClass(activeClassName);
            $(e.target).parent().addClass(activeClassName);
        };

        //highlight on scroll
        var timeout;
        var highlightOnScroll = function(e) {
            if (timeout) {
                clearTimeout(timeout);
            }
            timeout = setTimeout(function() {
                var top = $(window).scrollTop(),
                    highlighted, closest = Number.MAX_VALUE,
                    index = 0
                    offsets = headingOffsets();

                for (var i = 0, c = offsets.length; i < c; i++) {
                    var currentClosest = Math.abs(offsets[i] - top);
                    if (currentClosest < closest) {
                        index = i;
                        closest = currentClosest;
                    }
                }

                $('li', self).removeClass(activeClassName);
                highlighted = $('li:eq(' + index + ')', self).addClass(activeClassName);
                opts.onHighlight(highlighted);
            }, 50);
        };
        if (opts.highlightOnScroll) {
            $(window).bind('scroll', highlightOnScroll);
            highlightOnScroll();
        }

        return this.each(function() {
            //build TOC
            var el = $(this);
            var ul = $(opts.listType);

            headings.each(function(i, heading) {
                var $h = $(heading);

                var anchorName = opts.anchorName(i, heading, opts.prefix);

                //add anchor
                if (heading.id !== anchorName) {
                    var anchor = $('<span/>').attr('id', anchorName).insertBefore($h);
                }

                //build TOC item
                var a = $('<a/>')
                    .text(opts.headerText(i, heading, $h))
                    .attr('href', '#' + anchorName)
                    .bind('click', function(e) {
                        $(window).unbind('scroll', highlightOnScroll);
                        scrollTo(e, function() {
                            $(window).bind('scroll', highlightOnScroll);
                        });
                        el.trigger('selected', $(this).attr('href'));
                    });

                var li = $('<li/>')
                    .addClass(opts.itemClass(i, heading, $h, opts.prefix))
                    .append(a);

                ul.append(li);
            });
            el.html(ul);
        });
    };


    jQuery.fn.toc.defaults = {
        container: 'body',
        listType: '<ul/>',
        selectors: 'h1,h2,h3',
        smoothScrolling: function(target, options, callback) {
            $(target).smoothScroller({
                offset: options.scrollToOffset
            }).on('smoothScrollerComplete', function() {
                callback();
            });
        },
        scrollToOffset: 0,
        prefix: 'toc',
        activeClass: 'toc-active',
        onHighlight: function() {},
        highlightOnScroll: true,
        highlightOffset: 100,
        anchorName: function(i, heading, prefix) {
            if (heading.id.length) {
                return heading.id;
            }

            var candidateId = $(heading).text().replace(/[^a-z0-9]/ig, ' ').replace(/\s+/g, '-').toLowerCase();
            if (verboseIdCache[candidateId]) {
                var j = 2;

                while (verboseIdCache[candidateId + j]) {
                    j++;
                }
                candidateId = candidateId + '-' + j;

            }
            verboseIdCache[candidateId] = true;

            return prefix + '-' + candidateId;
        },
        headerText: function(i, heading, $heading) {
            return $heading.text();
        },
        itemClass: function(i, heading, $heading, prefix) {
            return prefix + '-' + $heading[0].tagName.toLowerCase();
        }

    };

})(jQuery);