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HTML
<nav class="breadcrumbs" role="navigation">
<a href="./home/">
<span class="crumbicon">
<svg viewBox="0 0 24 24" width="24" height="24" aria-hidden="true">
<use href="#icon-home" />
</svg>
</span>
<span class="home-label">Home</span>
</a>
<span class="crumb-separator" aria-hidden="true">»</span>
<span class="crumb">
<a aria-current="page">Page A</a>
<span class="crumbicon">
<svg viewBox="0 0 24 24" width="24" height="24" aria-hidden="true">
<use href="#icon-dropdown-arrow" />
</svg>
<select class="disguised-select" title="Navigate to another page">
<option selected>Page A</option>
<option>Page B</option>
<option>Page C</option>
</select>
</span>
</span>
</nav>
<svg style="display: none;">
<symbol id="icon-home">
<title>A home icon</title>
<path
d="M3 12l2-2m0 0l7-7 7 7M5 10v10a1 1 0 001 1h3m10-11l2 2m-2-2v10a1 1 0 01-1 1h-3m-6 0a1 1 0 001-1v-4a1 1 0 011-1h2a1 1 0 011 1v4a1 1 0 001 1m-6 0h6" />
</symbol>
<symbol id="icon-dropdown-arrow">
<title>A down arrow</title>
<path d="M19 9l-7 7-7-7" />
</symbol>
</svg>
CSS
.breadcrumbs {
--nav-gap: 2ch;
display: flex;
align-items: center;
overflow-x: auto;
overscroll-behavior-x: contain;
scroll-snap-type: x proximity;
gap: var(--nav-gap);
padding: calc(var(--nav-gap) / 2);
scroll-padding-inline: calc(var(--nav-gap) / 2);
& > a:first-of-type:not(.crumb) {
display: inline-flex;
align-items: center;
gap: calc(var(--nav-gap) / 4);
@media (width <= 480px) { & > .home-label {
display: none;
}}
}
& a {
text-underline-offset: .25em;
outline-offset: 3px;
/* fix Safari inaccessible dark color scheme links */
/* https://bugs.webkit.org/show_bug.cgi?id=226893 */
@media (prefers-color-scheme: dark) {
@supports (-webkit-hyphens:none) { &[href] {
color: hsl(240 100% 81%);
}}
}
}
& > .crumb:last-of-type {
scroll-snap-align: end;
}
@supports (-webkit-hyphens:none) {
scroll-snap-type: none;
}
}
.crumb {
display: inline-flex;
align-items: center;
gap: calc(var(--nav-gap) / 4);
& > a {
white-space: nowrap;
&[aria-current="page"] {
font-weight: bold;
}
}
&.tree-changed ~ * {
display: none;
}
}
.crumb-separator {
color: ButtonText;
}
.disguised-select {
inline-size: 100%;
block-size: 100%;
opacity: .01;
font-size: min(100%, 16px);
}
.crumbicon {
--size: 3ch;
display: grid;
grid: [stack] var(--size) / [stack] var(--size);
place-items: center;
border-radius: 50%;
--icon-shadow-size: 0px;
box-shadow: inset 0 0 0 var(--icon-shadow-size) currentColor;
@media (--motionOK) { & {
transition: box-shadow .2s ease;
}}
@nest .crumb:is(:focus-within, :hover) > & {
--icon-shadow-size: 1px;
}
@nest .crumb > &:is(:focus-within, :hover) {
--icon-shadow-size: 2px;
& svg {
stroke-width: 2px;
}
}
& > * {
grid-area: stack;
}
& > svg {
max-block-size: 100%;
margin: calc(var(--nav-gap) / 4);
stroke: currentColor;
fill: none;
stroke-linecap: round;
stroke-linejoin: round;
stroke-width: 1px;
}
}
JS
const crumbs = document.querySelectorAll('.breadcrumbs select')
const allowedKeys = new Set(['Tab', 'Enter', ' '])
const preventedKeys = new Set(['ArrowUp', 'ArrowDown'])
// watch crumbs for *full* changes,
// ensures it's not a user exploring options via keyboard
crumbs.forEach(nav => {
let ignoreChange = false
nav.addEventListener('change', e => {
if (ignoreChange) return
const option = e.target
const choice = option.value
const crumb = option.closest('.crumb')
// flag crumb so adjacent siblings can be hidden
crumb.classList.add('tree-changed')
// update crumb text to reflect the user's choice
crumb.querySelector(':scope > a').textContent = choice
routePage(choice)
})
nav.addEventListener('keydown', ({ key }) => {
if (preventedKeys.has(key))
ignoreChange = true
else if (allowedKeys.has(key))
ignoreChange = false
})
})
const routePage = route => {
console.info('change path to: ', route)
// change entire URL (window.location)
// or
// use your favorite clientside framework's router
}
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
Ultimo aggiornamento 2023-10-25 UTC.
[{
"type": "thumb-down",
"id": "missingTheInformationINeed",
"label":"Mancano le informazioni di cui ho bisogno"
},{
"type": "thumb-down",
"id": "tooComplicatedTooManySteps",
"label":"Troppo complicato/troppi passaggi"
},{
"type": "thumb-down",
"id": "outOfDate",
"label":"Obsoleti"
},{
"type": "thumb-down",
"id": "translationIssue",
"label":"Problema di traduzione"
},{
"type": "thumb-down",
"id": "samplesCodeIssue",
"label":"Problema relativo a esempi/codice"
},{
"type": "thumb-down",
"id": "otherDown",
"label":"Altra"
}]
[{
"type": "thumb-up",
"id": "easyToUnderstand",
"label":"Facile da capire"
},{
"type": "thumb-up",
"id": "solvedMyProblem",
"label":"Il problema è stato risolto"
},{
"type": "thumb-up",
"id": "otherUp",
"label":"Altra"
}]