https://adamdaniels.ca/talks/mithriljs-devtricks-2016/extensions/navigation/deck.navigation.js

1/*!
2Deck JS - deck.navigation
3Copyright (c) 2011-2014 Caleb Troughton
4Dual licensed under the MIT license.
5https://github.com/imakewebthings/deck.js/blob/master/MIT-license.txt
6*/
7
8/*
9This module adds clickable previous and next links to the deck.
10*/
11(function($, undefined) {
12  var $document = $(document);
13
14  /* Updates link hrefs, and disabled states if last/first slide */
15  var updateButtons = function(event, from, to) {
16    var options = $.deck('getOptions');
17    var lastIndex = $.deck('getSlides').length - 1;
18    var $prevSlide = $.deck('getSlide', to - 1);
19    var $nextSlide = $.deck('getSlide', to + 1);
20    var hrefBase = window.location.href.replace(/#.*/, '');
21    var prevId = $prevSlide ? $prevSlide.attr('id') : undefined;
22    var nextId = $nextSlide ? $nextSlide.attr('id') : undefined;
23    var $prevButton = $(options.selectors.previousLink);
24    var $nextButton = $(options.selectors.nextLink);
25
26    $prevButton.toggleClass(options.classes.navDisabled, to === 0);
27    $prevButton.attr('aria-disabled', to === 0);
28    $prevButton.attr('href', hrefBase + '#' + (prevId ? prevId : ''));
29    $nextButton.toggleClass(options.classes.navDisabled, to === lastIndex);
30    $nextButton.attr('aria-disabled', to === lastIndex);
31    $nextButton.attr('href', hrefBase + '#' + (nextId ? nextId : ''));
32  };
33
34  /*
35  Extends defaults/options.
36
37  options.classes.navDisabled
38    This class is added to a navigation link when that action is disabled.
39    It is added to the previous link when on the first slide, and to the
40    next link when on the last slide.
41
42  options.selectors.nextLink
43    The elements that match this selector will move the deck to the next
44    slide when clicked.
45
46  options.selectors.previousLink
47    The elements that match this selector will move to deck to the previous
48    slide when clicked.
49  */
50  $.extend(true, $.deck.defaults, {
51    classes: {
52      navDisabled: 'deck-nav-disabled'
53    },
54
55    selectors: {
56      nextLink: '.deck-next-link',
57      previousLink: '.deck-prev-link'
58    }
59  });
60
61  $document.bind('deck.init', function() {
62    var options = $.deck('getOptions');
63    var slides = $.deck('getSlides');
64    var $current = $.deck('getSlide');
65    var $prevButton = $(options.selectors.previousLink);
66    var $nextButton = $(options.selectors.nextLink);
67    var index;
68
69    // Setup prev/next link events
70    $prevButton.unbind('click.decknavigation');
71    $prevButton.bind('click.decknavigation', function(event) {
72      $.deck('prev');
73      event.preventDefault();
74    });
75
76    $nextButton.unbind('click.decknavigation');
77    $nextButton.bind('click.decknavigation', function(event) {
78      $.deck('next');
79      event.preventDefault();
80    });
81
82    // Find where we started in the deck and set initial states
83    $.each(slides, function(i, $slide) {
84      if ($slide === $current) {
85        index = i;
86        return false;
87      }
88    });
89    updateButtons(null, index, index);
90  });
91
92  $document.bind('deck.change', updateButtons);
93})(jQuery);
94