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/* Expandable sections */
(function () {
function toggle (button, target) {
var expanded = button.getAttribute('aria-expanded') === 'true';
button.setAttribute('aria-expanded', !expanded);
target.hidden = !target.hidden;
}
var expanders = document.querySelectorAll('[data-expands]');
Array.prototype.forEach.call(expanders, function (expander) {
var target = document.getElementById(expander.getAttribute('data-expands'));
expander.addEventListener('click', function () {
toggle(expander, target);
})
})
}());
/* Menu button */
(function () {
var button = document.getElementById('menu-button');
if (button) {
var menu = document.getElementById('patterns-list');
button.addEventListener('click', function() {
var expanded = this.getAttribute('aria-expanded') === 'true';
this.setAttribute('aria-expanded', !expanded);
})
}
}());
/* Persist navigation scroll point */
(function () {
window.onbeforeunload = function () {
var patternsNav = document.getElementById('patterns-nav');
if (patternsNav) {
var scrollPoint = patternsNav.scrollTop;
localStorage.setItem('scrollPoint', scrollPoint);
}
}
window.addEventListener('DOMContentLoaded', function () {
if (document.getElementById('patterns-nav')) {
if (window.location.href.indexOf('patterns/') !== -1) {
document.getElementById('patterns-nav').scrollTop = parseInt(localStorage.getItem('scrollPoint'));
} else {
document.getElementById('patterns-nav').scrollTop = 0;
}
}
})
}());
{{ if not .Site.Params.hideHeaderLinks }}
/* Add "link here" links to <h2> headings */
(function () {
var headings = document.querySelectorAll('main > h2');
Array.prototype.forEach.call(headings, function (heading) {
var id = heading.getAttribute('id');
if (id) {
var newHeading = heading.cloneNode(true);
newHeading.setAttribute('tabindex', '-1');
var container = document.createElement('div');
container.setAttribute('class', 'h2-container');
container.appendChild(newHeading);
heading.parentNode.insertBefore(container, heading);
var link = document.createElement('a');
link.setAttribute('href', '#' + id);
link.innerHTML = '<svg aria-hidden="true" class="link-icon" viewBox="0 0 50 50" focusable="false"> <use xlink:href="#link"></use> </svg>';
container.appendChild(link);
heading.parentNode.removeChild(heading);
}
})
}());
{{ end }}
/* Enable scrolling by keyboard of code samples */
(function () {
var codeBlocks = document.querySelectorAll('pre, .code-annotated');
Array.prototype.forEach.call(codeBlocks, function (block) {
if (block.querySelector('code')) {
block.setAttribute('role', 'region');
block.setAttribute('aria-label', 'code sample');
if (block.scrollWidth > block.clientWidth) {
block.setAttribute('tabindex', '0');
}
}
});
}());
/* Switch and persist theme */
(function () {
var checkbox = document.getElementById('themer');
function persistTheme(val) {
localStorage.setItem('darkTheme', val);
}
function applyDarkTheme() {
var rules = [
'.intro-and-nav, .main-and-footer { filter: invert(100%); }',
'* { background-color: inherit; }',
'img:not([src*=".svg"]), .colors, iframe, .demo-container { filter: invert(100%); }'
];
rules.forEach(function(rule) {
document.styleSheets[0].insertRule(rule);
})
}
function clearDarkTheme() {
for (let i = 0; i < document.styleSheets[0].cssRules.length; i++) {
document.styleSheets[0].deleteRule(i);
}
}
checkbox.addEventListener('change', function () {
if (this.checked) {
applyDarkTheme();
persistTheme('true');
} else {
clearDarkTheme();
persistTheme('false');
}
});
function handleDarkThemeAsDefault() {
{{ if .Site.Params.darkThemeAsDefault }}
persistTheme('true');
handleDarkThemeAsDefault = function() {};
{{ end }}
}
function showTheme() {
if (localStorage.getItem('darkTheme') === 'true') {
applyDarkTheme();
checkbox.checked = true;
}
}
function showContent() {
document.body.style.visibility = 'visible';
document.body.style.opacity = 1;
}
window.addEventListener('DOMContentLoaded', function () {
handleDarkThemeAsDefault();
showTheme();
showContent();
});
}());
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