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/*!
* toc - jQuery Table of Contents Plugin
* v0.3.2
* http://projects.jga.me/toc/
* copyright Greg Allen 2014
* MIT License
*/
(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 headingOffsets = [];
var activeClassName = opts.activeClass;
var scrollTo = function(e, 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;
for (var i = 0, c = headingOffsets.length; i < c; i++) {
var currentClosest = Math.abs(headingOffsets[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 = $(heading);
headingOffsets.push($h.offset().top - opts.highlightOffset);
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',
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);
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