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分页(Pagination)

分页(pagination)是用于指示一系列相关的内容存在于多个页面中的组件。本文档和示例用于讲解该分页(pagination)组件。

概述

我们让分页(pagination)占据了一大块区域来放置相互关联的链接,这让链接更醒目并且易于扩充,除了这些好处,还为链接提供了较大的点击区域。分页(Pagination)是利用 HTML 的列表元素构建的,因此屏幕阅读器可以识别并读出链接的数量。并且列表元素外面还用 <nav> 元素进行了包裹,以便让屏幕阅读器和其他辅助技术能够将其识别为导航区域。

此外,由于页面上可能会有多个这样的导航区域,因此建议为 <nav> 设置一个用于描述其用途的 aria-label 属性。例如,如果分页(pagination)组件用于链接一组搜索结果,则设置 aria-label="Search results pages" 比较合适。

<nav aria-label="Page navigation example">
  <ul class="pagination">
    <li class="page-item"><a class="page-link" href="#">Previous</a></li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item"><a class="page-link" href="#">Next</a></li>
  </ul>
</nav>

使用图标

想用图标或符号来代替某些分页链接的文字吗?请确保使用 aria 属性来为屏幕阅读器提供适当的支持。

<nav aria-label="Page navigation example">
  <ul class="pagination">
    <li class="page-item">
      <a class="page-link" href="#" aria-label="Previous">
        <span aria-hidden="true">&laquo;</span>
      </a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#" aria-label="Next">
        <span aria-hidden="true">&raquo;</span>
      </a>
    </li>
  </ul>
</nav>

禁用和激活状态

可根据不同情况对分页链接(pagination links)进行自定义。使用 .disabled 来显示不可点击的链接;使用 .active 来表示当前页面。

虽然 .disabled 类使用 pointer-events: none 属性来 尝试 封印 <a> 元素的链接功能,但是该 CSS 属性并未标准化,并且对键盘导航不起作用。因此,你应该为被禁用的链接添加 tabindex="-1" 属性,并自己编写 JavaScript 代码来完全封印其功能。

<nav aria-label="...">
  <ul class="pagination">
    <li class="page-item disabled">
      <a class="page-link">Previous</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item active" aria-current="page">
      <a class="page-link" href="#">2</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>

你可以通过将激活(active)或禁用(disabled)的链接替换为 <span> 标签,或者如果是 上一页/下一页 箭头的话,可以去掉 <a> 标签,从而删除该链接对单击功能的支持并防止获得键盘焦点,同时还能保留需要的样式。

<nav aria-label="...">
  <ul class="pagination">
    <li class="page-item disabled">
      <span class="page-link">Previous</span>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item active" aria-current="page">
      <span class="page-link">2</span>
    </li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>

尺寸

喜欢大的还是小的分页?通过添加 .pagination-lg.pagination-sm 可以设置其尺寸。

<nav aria-label="...">
  <ul class="pagination pagination-lg">
    <li class="page-item active" aria-current="page">
      <span class="page-link">1</span>
    </li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
  </ul>
</nav>
<nav aria-label="...">
  <ul class="pagination pagination-sm">
    <li class="page-item active" aria-current="page">
      <span class="page-link">1</span>
    </li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
  </ul>
</nav>

对齐

利用 flexbox 工具类 可以更改分页组件的对齐方式。

<nav aria-label="Page navigation example">
  <ul class="pagination justify-content-center">
    <li class="page-item disabled">
      <a class="page-link">Previous</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>
<nav aria-label="Page navigation example">
  <ul class="pagination justify-content-end">
    <li class="page-item disabled">
      <a class="page-link">Previous</a>
    </li>
    <li class="page-item"><a class="page-link" href="#">1</a></li>
    <li class="page-item"><a class="page-link" href="#">2</a></li>
    <li class="page-item"><a class="page-link" href="#">3</a></li>
    <li class="page-item">
      <a class="page-link" href="#">Next</a>
    </li>
  </ul>
</nav>

Sass

变量

$pagination-padding-y:              .375rem;
$pagination-padding-x:              .75rem;
$pagination-padding-y-sm:           .25rem;
$pagination-padding-x-sm:           .5rem;
$pagination-padding-y-lg:           .75rem;
$pagination-padding-x-lg:           1.5rem;

$pagination-color:                  $link-color;
$pagination-bg:                     $white;
$pagination-border-width:           $border-width;
$pagination-border-radius:          $border-radius;
$pagination-margin-start:           -$pagination-border-width;
$pagination-border-color:           $gray-300;

$pagination-focus-color:            $link-hover-color;
$pagination-focus-bg:               $gray-200;
$pagination-focus-box-shadow:       $input-btn-focus-box-shadow;
$pagination-focus-outline:          0;

$pagination-hover-color:            $link-hover-color;
$pagination-hover-bg:               $gray-200;
$pagination-hover-border-color:     $gray-300;

$pagination-active-color:           $component-active-color;
$pagination-active-bg:              $component-active-bg;
$pagination-active-border-color:    $pagination-active-bg;

$pagination-disabled-color:         $gray-600;
$pagination-disabled-bg:            $white;
$pagination-disabled-border-color:  $gray-300;

$pagination-transition:              color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out;

$pagination-border-radius-sm:       $border-radius-sm;
$pagination-border-radius-lg:       $border-radius-lg;

Mixins

@mixin pagination-size($padding-y, $padding-x, $font-size, $border-radius) {
  .page-link {
    padding: $padding-y $padding-x;
    @include font-size($font-size);
  }

  .page-item {
    @if $pagination-margin-start == (-$pagination-border-width) {
      &:first-child {
        .page-link {
          @include border-start-radius($border-radius);
        }
      }

      &:last-child {
        .page-link {
          @include border-end-radius($border-radius);
        }
      }
    } @else {
      //Add border-radius to all pageLinks in case they have left margin
      .page-link {
        @include border-radius($border-radius);
      }
    }
  }
}