麵包屑 (Breadcrumb)

在導航結構中透過 CSS 自動添加分隔符號指示當前頁面的位置。

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Example

<nav aria-label="breadcrumb">
  <ol class="breadcrumb">
    <li class="breadcrumb-item active" aria-current="page">Home</li>
  </ol>
</nav>

<nav aria-label="breadcrumb">
  <ol class="breadcrumb">
    <li class="breadcrumb-item"><a href="#">Home</a></li>
    <li class="breadcrumb-item active" aria-current="page">Library</li>
  </ol>
</nav>

<nav aria-label="breadcrumb">
  <ol class="breadcrumb">
    <li class="breadcrumb-item"><a href="#">Home</a></li>
    <li class="breadcrumb-item"><a href="#">Library</a></li>
    <li class="breadcrumb-item active" aria-current="page">Data</li>
  </ol>
</nav>

Changing the separator

Separators are automatically added in CSS through ::before and content. They can be changed by changing $breadcrumb-divider. The quote function is needed to generate the quotes around a string, so if you want > as seperator, you can use this:

$breadcrumb-divider: quote(">");

It’s also possible to use a base64 embedded SVG icon:

$breadcrumb-divider: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI4IiBoZWlnaHQ9IjgiPjxwYXRoIGQ9Ik0yLjUgMEwxIDEuNSAzLjUgNCAxIDYuNSAyLjUgOGw0LTQtNC00eiIgZmlsbD0iY3VycmVudENvbG9yIi8+PC9zdmc+);

The separator can be removed by setting $breadcrumb-divider to none:

$breadcrumb-divider: none;

網頁親和性

由於麵包屑提供了導航功能,所以增加一個有意義的標籤,aria-label="breadcrumb" 來描述 ‘<nav>’ 元素的導航說明,以及應用 aria-current="page" 到此群組的最後一個項目,表示這是當前頁面。

有關更多信息,請參閱 WAI-ARIA 麵包屑模式的實踐.