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/*
* section-folds.js -- Parse out sections to hide behind an "unfold" dialog
* Copyright © 2022 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 displayFold(fold, foldText, frontMatterText) {
foldText.innerHTML = `⬇️ ${frontMatterText}`;
fold.classList.remove("fold-hidden");
}
function hideFold(fold, foldText, frontMatterText) {
foldText.innerHTML = `➡️ Folded ${frontMatterText}`;
fold.classList.add("fold-hidden");
}
let folds = document.querySelectorAll(".section-fold");
for (let fold of folds) {
// The first thing we'll do is generate the "front matter" for the fold, so
// that the reader knows what lies beneath the fold.
let frontMatterText = `Section on "${fold.dataset.name}"`;
let foldFrontMatter = document.createElement("div");
// The text will be inside of an anchor, which we'll hook onto using an
// event listener.
let foldAnchor = document.createElement("a");
foldAnchor.href = "#";
let foldText = document.createElement("p");
foldAnchor.appendChild(foldText);
fold.parentNode.insertBefore(foldAnchor, fold);
// The fold will start off in the "hidden" state.
let toggle = false;
hideFold(fold, foldText, frontMatterText);
// But clicking on the "front matter" will cause the state of the fold
// to toggle, first to "visible", and then back to "hidden".
foldAnchor.addEventListener('click', () => {
toggle = !toggle;
if (toggle) {
displayFold(fold, foldText, frontMatterText);
} else {
hideFold(fold, foldText, frontMatterText);
}
});
}
}
// Defer parsing all of the "folds" until the document has completely loaded.
document.addEventListener("DOMContentLoaded", handleFolds);
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