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'use strict';
{
function setupTheme() {
const storedTheme = localStorage.getItem('theme');
const themeToggleButton = document.getElementById('theme-toggle-btn');
// Follow operating system theme preference
if (storedTheme === null && window.matchMedia) {
const mq = window.matchMedia('(prefers-color-scheme: dark)');
if ('onchange' in mq) {
function mqChangeListener(e) {
document.documentElement.classList.toggle('dark-mode', e.matches);
}
mq.addEventListener('change', mqChangeListener);
if (themeToggleButton) {
themeToggleButton.addEventListener(
'click',
function() {
mq.removeEventListener('change', mqChangeListener);
},
{ once: true },
);
}
}
}
if (themeToggleButton) {
themeToggleButton.hidden = false;
themeToggleButton.addEventListener('click', function() {
localStorage.setItem(
'theme',
document.documentElement.classList.toggle('dark-mode') ? 'dark' : 'light',
);
});
}
}
function setupPickers() {
function closeAllPickers() {
for (const picker of pickers) {
picker.parentNode.classList.remove('expanded');
picker.ariaExpanded = false;
}
window.removeEventListener('click', closeAllPickers);
window.removeEventListener('keydown', onKeyDown);
}
function onKeyDown(e) {
if (e.key === 'Escape') {
closeAllPickers();
}
}
const pickers = document.querySelectorAll('.picker-header > a');
for (const picker of pickers) {
const parentNode = picker.parentNode;
picker.ariaExpanded = parentNode.classList.contains('expanded');
picker.addEventListener('click', function(e) {
e.preventDefault();
/*
closeAllPickers as window event trigger already closed all the pickers,
if it already closed there is nothing else to do here
*/
if (picker.ariaExpanded === 'true') {
return;
}
/*
In the next frame reopen the picker if needed and also setup events
to close pickers if needed.
*/
requestAnimationFrame(function() {
picker.ariaExpanded = true;
parentNode.classList.add('expanded');
window.addEventListener('click', closeAllPickers);
window.addEventListener('keydown', onKeyDown);
parentNode.querySelector('.picker a').focus();
});
});
}
}
function setupStickyHeaders() {
const header = document.querySelector('.header');
let ignoreNextIntersection = false;
new IntersectionObserver(
function(e) {
const currentStatus = header.classList.contains('is-pinned');
const newStatus = e[0].intersectionRatio < 1;
// Same status, do nothing
if (currentStatus === newStatus) {
return;
} else if (ignoreNextIntersection) {
ignoreNextIntersection = false;
return;
}
/*
To avoid flickering, ignore the next changes event that is triggered
as the visible elements in the header change once we pin it.
The timer is reset anyway after few milliseconds.
*/
ignoreNextIntersection = true;
setTimeout(function() {
ignoreNextIntersection = false;
}, 50);
header.classList.toggle('is-pinned', newStatus);
},
{ threshold: [1] },
).observe(header);
}
function setupAltDocsLink() {
const linkWrapper = document.getElementById('alt-docs');
function updateHashes() {
for (const link of linkWrapper.querySelectorAll('a')) {
link.hash = location.hash;
}
}
addEventListener('hashchange', updateHashes);
updateHashes();
}
function setupFlavorToggles() {
const kFlavorPreference = 'customFlavor';
const flavorSetting = localStorage.getItem(kFlavorPreference) === 'true';
const flavorToggles = document.querySelectorAll('.js-flavor-toggle');
flavorToggles.forEach((toggleElement) => {
toggleElement.checked = flavorSetting;
toggleElement.addEventListener('change', (e) => {
const checked = e.target.checked;
if (checked) {
localStorage.setItem(kFlavorPreference, true);
} else {
localStorage.removeItem(kFlavorPreference);
}
flavorToggles.forEach((el) => {
el.checked = checked;
});
});
});
}
function setupCopyButton() {
const buttons = document.querySelectorAll('.copy-button');
buttons.forEach((button) => {
button.addEventListener('click', (el) => {
const parentNode = el.target.parentNode;
const flavorToggle = parentNode.querySelector('.js-flavor-toggle');
let code = '';
if (flavorToggle) {
if (flavorToggle.checked) {
code = parentNode.querySelector('.mjs').textContent;
} else {
code = parentNode.querySelector('.cjs').textContent;
}
} else {
code = parentNode.querySelector('code').textContent;
}
button.textContent = 'Copied';
navigator.clipboard.writeText(code);
setTimeout(() => {
button.textContent = 'Copy';
}, 2500);
});
});
}
function setupSidebarScroll() {
const sidebarLinks = document.querySelectorAll('#column2 a');
let link;
for (link of sidebarLinks) {
if (link.pathname === window.location.pathname) break;
}
if (!link) return;
link.scrollIntoView({ behavior: 'smooth', block: 'center' });
}
function bootstrap() {
// Check if we have JavaScript support.
document.documentElement.classList.add('has-js');
// Restore user mode preferences.
setupTheme();
// Handle pickers with click/taps rather than hovers.
setupPickers();
// Track when the header is in sticky position.
setupStickyHeaders();
// Make link to other versions of the doc open to the same hash target (if it exists).
setupAltDocsLink();
setupFlavorToggles();
setupCopyButton();
setupSidebarScroll();
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', bootstrap, { once: true });
} else {
bootstrap();
}
}