1 /******************************
2 * JavaScript for talk slides *
6 ******************************/
12 var defaultIdx = 1; // set to slide index to show by default
13 var firstIdx = 2; // set no value if to use first available
14 var lastIdx; // set no value if to use first available
16 var pageTitle, headerText, subHeaderText;
17 var navPrev, navNext, navPrevNolink, navNextNolink;
19 // Slide timer - color variation of headerText
20 // Up to 2/3 of that time, use "ontime" styling, then "neartime" until this is reached, "overtime" after that.
21 var slideSeconds = 2 * 60;
23 // Called when the document has been loaded.
24 function docLoaded() {
25 pageTitle = document.getElementsByTagName("title")[0];
26 headerText = document.getElementById("header-text");
27 subHeaderText = document.getElementById("subheader-text");
28 navPrev = document.getElementById("nav-prev");
29 navNext = document.getElementById("nav-next");
30 navPrevNolink = document.getElementById("nav-prev-nolink");
31 navNextNolink = document.getElementById("nav-next-nolink");
32 articleNodes = document.getElementsByTagName("article");
37 lastIdx = articleNodes.length - 1;
39 // Get a list of all slides (articles).
40 subHeaderText.textContent = articleNodes.length + " slides...";
41 for (var i = 0; i < articleNodes.length; ++i) {
42 subHeaderText.textContent = "Indexing slide " + i + " / " + articleNodes.length;
43 if (!articleNodes[i].id)
44 articleNodes[i].id = "slide_" + i;
46 slides[articleNodes[i].id] =
48 "name": articleNodes[i].id,
49 "title": articleNodes[i].title ? articleNodes[i].title : articleNodes[i].id,
50 "obj": articleNodes[i]};
52 if (location.hash.length &&
53 (location.hash == "#" + articleNodes[i].id || location.hash == "#" + i)) {
54 articleNodes[i].setAttribute("aria-selected", "true");
55 currentSlide = slides[articleNodes[i].id];
61 currentIdx = defaultIdx;
62 currentSlide = slides[articleNodes[currentIdx].id];
63 currentSlide.obj.setAttribute("aria-selected", "true");
64 location.hash = "#" + currentSlide.name;
69 // Called when the hash part of the location changes.
70 function locationHashChanged() {
71 if (location.hash.length > 1) {
72 var hashtag = location.hash.substring(1);
73 // If not a number, treat as ID
74 if (isNaN(hashtag) && slides[hashtag]) {
75 currentSlide.obj.removeAttribute("aria-selected");
76 currentSlide = slides[hashtag];
77 currentIdx = currentSlide.idx;
78 currentSlide.obj.setAttribute("aria-selected", "true");
81 else if (articleNodes[hashtag]) {
82 currentSlide.obj.removeAttribute("aria-selected");
84 currentSlide = slides[articleNodes[currentIdx].id];
85 currentSlide.obj.setAttribute("aria-selected", "true");
90 window.onhashchange = locationHashChanged;
92 // Update the display after we updated what slide is shown.
93 function updateDisplay() {
94 if (currentIdx >= firstIdx && currentIdx <= lastIdx &&
95 currentSlide.name != "toc")
96 subHeaderText.textContent = (currentIdx - firstIdx + 1) + "/" +
97 (lastIdx - firstIdx + 1) + " - " +
100 subHeaderText.textContent = currentSlide.title;
101 pageTitle.textContent = headerText.textContent + ": " + currentSlide.title;
102 if (currentIdx > firstIdx && currentSlide.name != "toc") {
103 navPrev.hidden = false;
104 navPrev.href = "#" + articleNodes[currentIdx - 1].id;
105 navPrevNolink.hidden = true;
108 navPrev.hidden = true;
109 navPrevNolink.hidden = false;
111 if (currentIdx < lastIdx && currentSlide.name != "toc") {
112 navNext.hidden = false;
113 navNext.href = "#" + articleNodes[currentIdx + 1].id;
114 navNextNolink.hidden = true;
117 navNext.hidden = true;
118 navNextNolink.hidden = false;
120 headerText.className = "";
121 slideStart = new Date();
122 if (currentSlide.name == "toc")
125 setTimeout("timerFired()", timerMSec);
129 function createTOC() {
130 var list = document.getElementById("toc-list");
131 if (!list.getElementsByTagName("li").length) {
132 for (var slide in slides) {
133 if (slide != "toc") {
134 var item = document.createElement("li");
135 var link = document.createElement("a");
136 var slideHeaders = slides[slide].obj.getElementsByTagName("h1");
137 if (slideHeaders.length)
138 link.textContent = slideHeaders[0].textContent;
140 link.textContent = slides[slide].title;
141 link.href = "#" + slides[slide].name;
142 item.appendChild(link);
143 list.appendChild(item);
149 // Do timed color variation on slides.
150 function timerFired() {
151 var slideCurrent = new Date();
152 var secondsDiff = Math.round((slideCurrent.getTime() - slideStart.getTime()) / 1000);
153 if (secondsDiff >= slideSeconds) {
154 headerText.className = "overtime";
156 else if (secondsDiff >= Math.round(2 * slideSeconds / 3)) {
157 headerText.className = "ontime";
158 setTimeout("timerFired()", timerMSec);
160 else if (secondsDiff >= Math.round(slideSeconds / 3)) {
161 headerText.className = "neartime";
162 setTimeout("timerFired()", timerMSec);
165 // We should never come here, but if we do, go into a 100ms loop until we get over the upcoming step.
166 setTimeout("timerFired()", 100);
169 var slideStart = new Date();
170 var timerMSec = 1000 * (slideSeconds / 3);
171 setTimeout("timerFired()", timerMSec);
173 // Keyboard/click nav functionality, mostly inherited from FOSDEM 2007.
176 where = where || "next";
177 var navElem = document.getElementById("nav-" + where);
179 window.location.href = navElem.href;
182 function handleClick(e) {
184 var target = (window.event) ? e.srcElement : e.target;
185 if (e.which == 1 && target.nodeName != "A" && target.nodeName != "VIDEO")
189 function handleKeyPress(e) {
199 window.onclick = handleClick;
200 window.onkeypress = handleKeyPress;