1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/*
* section-folds.js -- Parse out sections to hide behind an "unfold" dialog
* Copyright © 2022 - 2023 Jakob L. Kreuze <zerodaysfordays@sdf.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
function handleFolds() {
function hideFold(fold, foldButton, frontMatterText) {
foldButton.innerHTML = `↓ Show More`;
fold.classList.remove("expanded");
}
function displayFold(fold, foldButton, frontMatterText) {
foldButton.innerHTML = `↑ Show Less`;
fold.classList.add("expanded");
}
let folds = document.querySelectorAll(".section-fold");
for (let fold of folds) {
// The first thing we'll do is generate the "front matter" for the fold, so
// that the reader knows what lies beneath the fold.
let frontMatterText = `Section on "${fold.dataset.name}"`;
let foldFrontMatter = document.createElement("div");
// The toggle will be a button, which we'll hook onto using an
// event listener.
let foldButton = document.createElement("button");
foldButton.classList.add("fold-toggle");
fold.parentNode.insertBefore(foldButton, fold.nextSibling);
// The fold will start off in the "hidden" state.
let toggle = false;
hideFold(fold, foldButton, frontMatterText);
// But clicking on the "front matter" will cause the state of the fold
// to toggle, first to "visible", and then back to "hidden".
foldButton.addEventListener('click', () => {
toggle = !toggle;
if (toggle) {
displayFold(fold, foldButton, frontMatterText);
} else {
hideFold(fold, foldButton, frontMatterText);
}
});
}
}
// Defer parsing all of the "folds" until the document has completely loaded.
document.addEventListener("DOMContentLoaded", handleFolds);
|
