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index.html
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<html>
<style>
div,
span,
form,
input {
padding: 0;
margin: 0;
}
body {
font-family: Helvetica, sans-serif;
font-size: 30px;
padding: 0;
margin: 0;
}
#slide-content {
max-width: 100vw;
margin: 0 30px;
margin-top: 30px;
}
#slide-content img:first-of-type,
#menu-controls {
margin-top: -30px; /* undo the margin-top of #slide-content */
}
#menu {
color: #ccc;
padding: none;
padding: 5px 30px 5px 30px;
font-size: 12px;
border-bottom: 1px solid #efefef;
z-index: 99;
position: absolute;
background: #ffffff;
width: 100%;
}
#menu-controls {
display: flex;
flex-direction: row;
align-items: center;
}
/* flex spacing */
#help-icon,
#url-input,
input[type='submit'] {
margin-right: 10px;
}
#menu-controls form {
flex-grow: 1;
/* everything else is 0 */
}
#help-icon {
height: 12px;
width: 12px;
font-size: 12px;
line-height: 12px;
border-style: 1px solid #ccc;
border-radius: 50%;
padding: 1px;
text-align: center;
border-radius: 50%;
display: inline-block;
color: #ccc;
font-weight: 100;
border: 1px solid #ccc;
display: inline-block;
cursor: pointer;
}
#help-info {
font-size: medium;
}
img {
/* constrain by either height or width, whatever hits the edge first */
max-width: 100%;
max-height: 100vh;
width: auto;
height: auto;
}
p > em {
/* hide the image labels */
display: none;
}
form {
border: none;
margin: 0;
padding: 0;
display: flex;
}
input {
border: 1px solid #ccc;
background-color: #fff;
padding: none;
margin: none;
font-size: 12px;
color: #ccc;
padding: 2px 4px;
display: inline-block;
}
#url-input {
color: #bbb;
flex-grow: 1;
}
#slide-index {
font-size: 12px;
}
</style>
<script src="https://unpkg.com/commonmark@0.29.3/dist/commonmark.js "></script>
<script>
/* globals commonmark */
function loadMarkdown(url) {}
class SimpleSlider {
static responseCache = {};
static DEFAULT_URL =
'https://gist.githubusercontent.com/kortina/66d1263fe538b30f4a489d8c97faa140/raw/c56f514a0c1eabe546537b59ba02e6fba8e399d1/very-simple-slide-example.md';
static USE_TEST_MD = false;
static TEST_MD = `
# TEST
The speaker notes for slide numero uno. Images render as slides, text as the speaker notes.
*Machine Gun.*
I like to write this way, even for essays these days, with an image on screen for each section.
Better to burn out than fade away, said this man.
Sometimes when I'm editing, there will be several paragraphs where I don't want the image to scroll off the top of the screen.
# An h1 heading will also render as a slide.
## Another h1 or h2 or h3 creates a new slide.
#### h4, h5, and h6 will render as part of the same slide.
##### h5, and h6 will render as part of the same slide.
###### h6 will render as part of the same slide.
---
###### A horizontal rule (\`---\`) will force a new slide.
# Want to use an iframe embed? Just put it in an h1...
# <iframe width="560" height="315" src="https://www.youtube.com/embed/UcU04NGMQb8" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
# That's about it.
`;
constructor(markdownRaw) {
this.markdownRaw = markdownRaw;
this.slides = [];
this._currentSlide = null;
}
static qsURL() {
var p = new URLSearchParams(document.location.search);
return p.get('url');
}
static initURL() {
var u = this.qsURL() || this.DEFAULT_URL;
var el = document.getElementById('url-input');
if (u && !el.value) {
el.value = u;
}
}
static formSubmit(event) {
console.log(`formSubmit: ${this.formValue()}`);
var url = this.formValue();
if (`${url}` != '') {
var qsURL = this.qsURL();
if (qsURL == url) {
console.warning(`url already loaded`);
} else {
var l = document.location;
var e = encodeURIComponent(url);
var n = `${l.protocol}//${l.host}${l.pathname}?url=${e}`;
console.log(n);
document.location = n;
}
}
return false;
}
static formValue() {
var el = document.getElementById('url-input');
if (el) {
return el.value;
}
}
spawnSlide() {
if (this._currentSlide) {
this.slides.push(this._currentSlide);
}
this._currentSlide = {
slide: new commonmark.Node('document'),
speakerNotes: new commonmark.Node('document'),
};
}
static fetchMarkdown() {
this.fetchMarkdownFromURL(this.formValue());
}
static fetchMarkdownFromURL(url) {
var markdown = this.USE_TEST_MD ? this.TEST_MD : this.responseCache[url];
if (markdown) {
this.onFetch(markdown);
} else {
fetch(url)
.then((response) => response.text())
.then((result) => {
this.responseCache[url] = result;
this.onFetch(result);
});
}
}
static onFetch(result) {
window.VSS = new SimpleSlider(result);
window.VSS.parseAndRenderMarkdown(result);
}
static removeFrontmatter(markdownRaw) {
window.markdownRaw = markdownRaw;
console.log(markdownRaw);
if (markdownRaw.startsWith('---')) {
var lines = markdownRaw.split('\n');
var i = 1;
while (lines[i] != '---') {
i++;
}
return lines.slice(i + 1).join('\n');
}
return markdownRaw;
}
parseMarkdown(markdownRaw) {
var reader = new commonmark.Parser();
markdownRaw = SimpleSlider.removeFrontmatter(markdownRaw);
var parsed = reader.parse(markdownRaw);
window.PARSED = parsed;
var walker = parsed.walker();
var event, node;
var slide = new commonmark.Node('document');
var speakerNotes = new commonmark.Node('document');
var spawns = false;
while ((event = walker.next())) {
node = event.node;
this.prefetchImage(node, event);
// we only care about direct descendants of root `document`
if (!childOfRoot(node)) {
continue;
}
spawns = spawns || spawnsNewSlide(node, event);
// Make sure we only visit nodes once.
// NB: this will break if we flip / do NO handle nodes on-entering:
if (event.entering) {
// code_block doesn't seem to have the non-entering event
if (node.type != 'code_block') {
continue;
}
}
// console.log(node.type, {
// type: node.type,
// childOfRoot: childOfRoot(node),
// firstChildType: firstChildType(node),
// spawns: spawns,
// entering: event.entering,
// iH: node.innerHTML,
// });
var contentNode = this.cloneByTakingChildren(node);
node.unlink();
if (spawns) {
this.spawnSlide();
// reset spawns:
spawns = false;
}
this.addContentToCurrentSlide(contentNode);
}
this.spawnSlide();
// this.slides.push({slide: slide, speakerNotes: speakerNotes});
}
parseAndRenderMarkdown(markdownRaw) {
// TODO: display slide numbers
// TODO: speaker notes window: https://stackoverflow.com/questions/5277482/can-i-control-two-browser-windows-with-one-html5-app
this.parseMarkdown(markdownRaw);
window.SLIDES = this.slides;
moveTo(currentIndex());
}
addContentToCurrentSlide(contentNode) {
if (!this._currentSlide) {
this.spawnSlide();
}
if (rendersOnSlide(contentNode)) {
this._currentSlide.slide.appendChild(contentNode);
} else {
this._currentSlide.speakerNotes.appendChild(contentNode);
}
}
prefetchImage(node, event) {
if (event.entering && node.type == 'image' && node.destination) {
var img = new Image();
img.src = node.destination;
}
}
cloneByTakingChildren(node) {
var nn = new commonmark.Node(node.type);
nn.level = node.level;
while (node.firstChild) {
nn.appendChild(node.firstChild);
}
nn.literal = node.literal;
return nn;
}
}
function firstChildType(node) {
return node.firstChild && node.firstChild.type;
}
function rendersOnSlide(node) {
var fcType = firstChildType(node);
if (fcType == 'image') {
return true;
}
if (node.type == 'heading') {
return true;
}
return false;
}
function spawnsNewSlide(node, event) {
// Only spawn new slides when not entering,
// except for thematic_break, which has no non-entering event.
if (event.entering) {
return node.type == 'thematic_break';
}
var fcType = firstChildType(node);
if (fcType == 'image') {
return true;
}
if (node.type == 'heading' && node.level <= 3) {
return true;
}
return false;
}
function childOfRoot(node) {
return node.parent && node.parent.parent === null ? true : false;
}
function renderSlideIndex() {
if (!window.SLIDES) {
return;
}
var el = document.getElementById('slide-index');
el.innerHTML = `${this.currentIndex()} / ${window.SLIDES.length - 1}`;
}
function renderIndex(i) {
// TODO: update window.SLIDES to none if we load invalid URL?
if (!window.SLIDES || window.SLIDES.length < i) {
return;
}
this.renderSlideIndex();
var writer = new commonmark.HtmlRenderer();
var s = window.SLIDES[i];
document.getElementById('slide-content').innerHTML = writer.render(s.slide);
renderSpeakerNotes(i);
}
function onDocReady(fn) {
// see if DOM is already available
if (document.readyState === 'complete' || document.readyState === 'interactive') {
// call on next available tick
setTimeout(fn, 1);
} else {
document.addEventListener('DOMContentLoaded', fn);
}
}
function moveTo(i) {
document.location.hash = `#${i}`;
renderIndex(i);
}
function currentIndex() {
var currentIndexStr = document.location.hash || '#0';
return parseInt(currentIndexStr.replace('#', ''), 10);
}
function moveLeft() {
moveTo(Math.max(currentIndex() - 1, 0));
}
function moveRight() {
var max = window.SLIDES ? window.SLIDES.length - 1 : 0;
moveTo(Math.min(currentIndex() + 1, max));
}
function onKey(e) {
if (e.target.nodeName == 'INPUT') {
return;
}
switch (e.code) {
case 'ArrowLeft':
captureEvent(e);
return moveLeft();
case 'ArrowRight':
captureEvent(e);
return moveRight();
case 'KeyN':
captureEvent(e);
return openSpeakerNotes();
case 'KeyM':
captureEvent(e);
return toggleMenu();
case 'Slash':
if (e.key == '?') {
captureEvent(e);
return toggleHelp();
}
default:
break;
// console.log(`code: ${e.code}`);
}
}
function captureEvent(e) {
if (e.target.nodeName == 'BODY') {
e.preventDefault();
}
}
function openSpeakerNotes() {
window.SN_WINDOW = window.open('slider-notes.html', 'secondary', 'width=600,height=1000');
window.SN_WINDOW.onload = function () {
renderSpeakerNotes(currentIndex());
};
}
function renderSpeakerNotes(i) {
if (window.SN_WINDOW) {
if (!window.SLIDES || window.SLIDES.length < i) {
return;
}
var writer = new commonmark.HtmlRenderer();
var s = window.SLIDES[i];
var html = writer.render(s.speakerNotes);
window.SN_WINDOW.render(html);
} else {
console.log('Speaker notes window is not open.');
}
}
function toggleMenu() {
toggleElementWithId('menu');
}
function toggleHelp() {
toggleElementWithId('help-info');
}
function toggleElementWithId(id) {
var el = document.getElementById(id);
var d = ['', 'none', null, undefined].includes(el.style.display) ? 'block' : 'none';
el.style.display = d;
}
onDocReady(function () {
SimpleSlider.initURL();
SimpleSlider.fetchMarkdown();
document.addEventListener('keydown', onKey); // keyup resulted in arrows still working
document.getElementById('help-icon').addEventListener('click', toggleHelp);
});
</script>
<body>
<div id="menu" style="display: block">
<div id="menu-controls">
<div id="help-icon" title="help">?</div>
<form onsubmit="return SimpleSlider.formSubmit();">
<input id="url-input" type="text" />
<input type="submit" value="Load" />
</form>
<div id="slide-index"></div>
</div>
<div id="help-info" style="display: none">
<pre>
Keyboard Shortcuts
n open speaker notes
→ next slide
← prev slide
m show / hide menu
? show / hide help
</pre
>
</div>
</div>
<div id="slide-content"></div>
</body>
</html>