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