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index.html
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
<head>
<title>Presentation Ninja</title>
<meta charset="utf-8" />
<meta name="author" content="Joseph V. Casillas" />
<meta name="date" content="2019-11-27" />
<link href="index_files/remark-css/rutgers.css" rel="stylesheet" />
<link href="index_files/remark-css/rutgers-fonts.css" rel="stylesheet" />
</head>
<body>
<textarea id="source">
class: center, middle, inverse, title-slide
# Presentation Ninja
## Adding a timer to xaringan slides
### Joseph V. Casillas
### Rutgers University
### 2019-11-27
---
# Check out this timer
- The timer is setup to be centered on the bottom of the screen when in
fullscreen mode
- Type "f" to check it out
---
# How it works
- I use the `countdown` package to create the timer in a separate HTML
document<sup>1</sup>
- I then import the timer in the YAML front matter of my xaringan slides
- The time is set to countdown from 20 minutes, the typical duration of an
academic presentation in my field
.footnote[<sup>1</sup> More info here: https://github.com/gadenbuie/countdown/issues/14]
---
# Try it
- To include the timer in your `xaringan` presentations add the following
to your YAML front matter:
```yaml
output:
xaringan::moon_reader:
includes:
after_body: https://raw.githubusercontent.com/jvcasillas/xaringan_timer/master/timer.html
```
</textarea>
<style data-target="print-only">@media screen {.remark-slide-container{display:block;}.remark-slide-scaler{box-shadow:none;}}</style>
<script src="https://remarkjs.com/downloads/remark-latest.min.js"></script>
<script>var slideshow = remark.create({
"ratio": "16:9"
});
if (window.HTMLWidgets) slideshow.on('afterShowSlide', function (slide) {
window.dispatchEvent(new Event('resize'));
});
(function(d) {
var s = d.createElement("style"), r = d.querySelector(".remark-slide-scaler");
if (!r) return;
s.type = "text/css"; s.innerHTML = "@page {size: " + r.style.width + " " + r.style.height +"; }";
d.head.appendChild(s);
})(document);
(function(d) {
var el = d.getElementsByClassName("remark-slides-area");
if (!el) return;
var slide, slides = slideshow.getSlides(), els = el[0].children;
for (var i = 1; i < slides.length; i++) {
slide = slides[i];
if (slide.properties.continued === "true" || slide.properties.count === "false") {
els[i - 1].className += ' has-continuation';
}
}
var s = d.createElement("style");
s.type = "text/css"; s.innerHTML = "@media print { .has-continuation { display: none; } }";
d.head.appendChild(s);
})(document);
// delete the temporary CSS (for displaying all slides initially) when the user
// starts to view slides
(function() {
var deleted = false;
slideshow.on('beforeShowSlide', function(slide) {
if (deleted) return;
var sheets = document.styleSheets, node;
for (var i = 0; i < sheets.length; i++) {
node = sheets[i].ownerNode;
if (node.dataset["target"] !== "print-only") continue;
node.parentNode.removeChild(node);
}
deleted = true;
});
})();</script>
<style type="text/css">.countdown {
background: transparent;
position: absolute;
cursor: pointer;
font-size: 2em;
line-height: 1.2;
margin-left: auto;
margin-right: auto;
width: 100%;
padding: 0 15px;
text-align: center;
}
code.countdown-time {
vertical-align: middle;
}
.countdown-digits {
color: #eaeaea;
}
.countdown.running {
border-color: transparent;
background-color: transparent;
}
.countdown.running .countdown-digits {
color: grey;
}
.countdown.finished {
border-color: #CC0033;
background-color: #5F6A72;
}
.countdown.finished .countdown-digits {
color: #CC0033;
}
.countdown.running.warning {
border-color: #CFAE24;
background-color: #E6C229;
}
.countdown.running.warning .countdown-digits {
color: #39300A;
}
@-webkit-keyframes blink {
from {opacity: 1}
50% {opacity: 0.1}
to {opacity: 1}
}
@keyframes blink {
from {opacity: 1}
50% {opacity: 0.1}
to {opacity: 1}
}
.countdown.running.blink-colon .countdown-digits.colon {
-webkit-animation: blink 2s steps(1, end) 0s infinite;
animation: blink 2s steps(1, end) 0s infinite;
}
</style>
<script>var counters = {timer: {}};
var update_timer = function(timer, force = false) {
var secs = timer.value;
// check if we should update timer or not
noup = timer.div.className.match(/noupdate-\d+/);
if (!force && noup != null) {
noup = parseInt(noup[0].match(/\d+$/));
if (secs > noup * 2 && secs % noup > 0) { return; }
}
// should we apply or remove warning class?
warnwhen = timer.div.dataset.warnwhen;
if (warnwhen && warnwhen > 0) {
if (secs <= warnwhen && !timer.div.classList.contains("warning")) {
timer.div.classList.add("warning");
} else if (secs > warnwhen && timer.div.classList.contains("warning")) {
timer.div.classList.remove("warning");
}
}
var mins = Math.floor(secs / 60); // 1 min = 60 secs
secs -= mins * 60;
// Update HTML
timer.min.innerHTML = String(mins).padStart(2, 0);
timer.sec.innerHTML = String(secs).padStart(2, 0);
}
var countdown = function (e) {
target = e.target;
if (target.classList.contains("countdown-digits")) {
target = target.parentElement;
}
if (target.tagName == "CODE") {
target = target.parentElement;
}
// Init counter
if (!counters.timer.hasOwnProperty(target.id)) {
counters.timer[target.id] = {};
// Set the containers
counters.timer[target.id].min = target.getElementsByClassName("minutes")[0];
counters.timer[target.id].sec = target.getElementsByClassName("seconds")[0];
counters.timer[target.id].div = target;
}
if (!counters.timer[target.id].running) {
if (!counters.timer[target.id].end) {
counters.timer[target.id].end = parseInt(counters.timer[target.id].min.innerHTML) * 60;
counters.timer[target.id].end += parseInt(counters.timer[target.id].sec.innerHTML);
}
counters.timer[target.id].value = counters.timer[target.id].end;
update_timer(counters.timer[target.id]);
if (counters.ticker) counters.timer[target.id].value += 1;
// Start if not past end date
if (counters.timer[target.id].value > 0) {
base_class = target.className.replace(/\s?(running|finished)/, "")
target.className = base_class + " running";
counters.timer[target.id].running = true;
if (!counters.ticker) {
counters.ticker = setInterval(counter_update_all, 1000);
}
}
} else {
// Bump timer value if running & clicked
counters.timer[target.id].value += counter_bump_increment(counters.timer[target.id].end);
update_timer(counters.timer[target.id], force = true);
counters.timer[target.id].value += 1;
}
};
var counter_bump_increment = function(val) {
if (val <= 30) {
return 5;
} else if (val <= 300) {
return 15;
} else if (val <= 3000) {
return 30;
} else {
return 60;
}
}
var counter_update_all = function() {
// Iterate over all running timers
for (var i in counters.timer) {
// Stop if passed end time
console.log(counters.timer[i].id)
counters.timer[i].value--;
if (counters.timer[i].value <= 0) {
counters.timer[i].min.innerHTML = "00";
counters.timer[i].sec.innerHTML = "00";
counters.timer[i].div.className = counters.timer[i].div.className.replace("running", "finished");
counters.timer[i].running = false;
} else {
// Update
update_timer(counters.timer[i]);
// Play countdown sound if data-audio=true on container div
if (counters.timer[i].div.dataset.audio && counters.timer[i].value == 5) {
counter_play_sound();
}
}
}
// If no more running timers, then clear ticker
var timerIsRunning = false;
for (var t in counters.timer) {
timerIsRunning = timerIsRunning || counters.timer[t].running
}
if (!timerIsRunning) {
clearInterval(counters.ticker);
counters.ticker = null;
}
}
var counter_play_sound = function() {
try {
var finished_sound = new Audio('libs/countdown/smb_stage_clear.mp3');
finished_sound.play();
} catch (e) {
try {
var finished_sound = new Audio('smb_stage_clear.mp3');
finished_sound.play();
} catch (e) {
console.log("Unable to locate sound file smb_stage_clear.mp3.")
}
}
}
var counter_addEventListener = function() {
if (!document.getElementsByClassName("countdown").length) {
setTimeout(counter_addEventListener, 2);
return;
}
var counter_divs = document.getElementsByClassName("countdown");
console.log(counter_divs);
for (var i = 0; i < counter_divs.length; i++) {
counter_divs[i].addEventListener("click", countdown, false);
}
};
counter_addEventListener();
</script>
<div class="countdown" id="timer_5ddeaad6" style="bottom:0;z-index:100" data-warnwhen="0"><code class="countdown-time"><span class="countdown-digits minutes">20</span><span class="countdown-digits colon">:</span><span class="countdown-digits seconds">00</span></code>
</div>
<script>
(function() {
var links = document.getElementsByTagName('a');
for (var i = 0; i < links.length; i++) {
if (/^(https?:)?\/\//.test(links[i].getAttribute('href'))) {
links[i].target = '_blank';
}
}
})();
</script>
<script>
slideshow._releaseMath = function(el) {
var i, text, code, codes = el.getElementsByTagName('code');
for (i = 0; i < codes.length;) {
code = codes[i];
if (code.parentNode.tagName !== 'PRE' && code.childElementCount === 0) {
text = code.textContent;
if (/^\\\((.|\s)+\\\)$/.test(text) || /^\\\[(.|\s)+\\\]$/.test(text) ||
/^\$\$(.|\s)+\$\$$/.test(text) ||
/^\\begin\{([^}]+)\}(.|\s)+\\end\{[^}]+\}$/.test(text)) {
code.outerHTML = code.innerHTML; // remove <code></code>
continue;
}
}
i++;
}
};
slideshow._releaseMath(document);
</script>
<!-- dynamically load mathjax for compatibility with self-contained -->
<script>
(function () {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-MML-AM_CHTML';
if (location.protocol !== 'file:' && /^https?:/.test(script.src))
script.src = script.src.replace(/^https?:/, '');
document.getElementsByTagName('head')[0].appendChild(script);
})();
</script>
</body>
</html>