gallery/script/gallery.js

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JavaScript
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(function() {
'use strict';
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let reqBoxes;
let excBoxes;
let allBoxes;
let tags;
let itemsByYear;
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let showSingles = true;
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function fillSets() {
let checkedValues = boxes =>
new Set(boxes.filter(b => b.checked).map(b => b.value));
return [checkedValues(reqBoxes), checkedValues(excBoxes)];
}
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function updateItems() {
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let [reqTags, excTags] = fillSets();
let anyReq = reqTags.size > 0;
for (let [year, items] of itemsByYear) {
let hide = true;
for (let item of items) {
let req = tags.get(item).some(x => reqTags.has(x));
let exc = tags.get(item).some(x => excTags.has(x));
let hidden = exc || (anyReq && !req);
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item.hidden = hidden;
hide &&= hidden;
}
document.getElementById(`marker-${year}`).hidden = hide;
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}
}
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function update() {
updateItems();
history.pushState(null, "", makeFragment());
}
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function converseId(id) {
if (id.match(/^require/)) {
return id.replace('require', 'exclude');
} else {
return id.replace('exclude', 'require');
}
}
function toggle(checkbox, thisSet, thatSet) {
if (checkbox.checked)
document.getElementById(converseId(checkbox.id)).checked = false;
update();
}
function clearForm() {
allBoxes.forEach(b => b.checked = false);
}
function clear(e) {
clearForm();
update();
if (e) e.preventDefault();
}
function toggleSingles(e) {
showSingles = !showSingles;
for (let li of document.querySelectorAll('#filters li')) {
let count = li.querySelector('label').dataset.count;
if (count <= 1) {
li.hidden = !showSingles;
}
}
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if (e) e.preventDefault();
}
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function makeFragment() {
let ids = allBoxes.filter(b => b.checked).map(b => b.id);
if (ids.length == 0) {
return '#all';
} else if (allBoxes.every(b => b.checked == b.defaultChecked)) {
return '#';
} else {
return '#' + ids.join(';');
}
}
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function useFragment() {
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let frag = decodeURIComponent(location.hash).replace(/^#/, '');
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if (frag == 'all' || !frag) {
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clearForm();
} else {
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let set = new Set(frag.split(';'));
allBoxes.forEach(b => b.checked = set.has(b.id));
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document.getElementById('filters-details').open = true;
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}
updateItems();
}
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function setup() {
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function inputs(id) {
let iter = document.getElementById(id).getElementsByTagName('input');
return Array.from(iter);
}
let items = Array.from(document.getElementsByClassName('post'));
itemsByYear = new Map;
for (let item of items) {
let year = item.dataset.year;
if (!itemsByYear.has(year)) itemsByYear.set(year, new Set);
itemsByYear.get(year).add(item);
}
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reqBoxes = inputs('require');
excBoxes = inputs('exclude');
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allBoxes = [...reqBoxes, ...excBoxes];
tags = new Map(items.map(item => [item, item.dataset.tags.split(';')]));
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allBoxes.forEach(b => b.addEventListener('change', () => toggle(b)));
document.getElementById('clear').addEventListener('click', clear);
document.getElementById('singles').addEventListener('click', toggleSingles);
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window.addEventListener('popstate', useFragment);
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useFragment();
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}
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window.addEventListener('DOMContentLoaded', setup);
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})();