Position
使用这些简写实用程序可以快速配置元素的position。
On this page
Position values
快速position类是可用的,但是它们没有响应式能力。
<div class="position-static">...</div>
<div class="position-relative">...</div>
<div class="position-absolute">...</div>
<div class="position-fixed">...</div>
<div class="position-sticky">...</div>
Arrange elements
使用边缘定位实用程序可以轻松排列元素。 格式为 {property}-{position}
。
其中,property是以下之一:
top
- for the verticaltop
positionstart
- for the horizontalleft
position (in LTR)bottom
- for the verticalbottom
positionend
- for the horizontalright
position (in LTR)
其中,position是以下之一:
0
- for0
edge position50
- for50%
edge position100
- for100%
edge position
(您可以通过向$position values
Sass映射变量添加条目来添加更多的位置值。)
<div class="position-relative">
<div class="position-absolute top-0 start-0"></div>
<div class="position-absolute top-0 end-0"></div>
<div class="position-absolute top-50 start-50"></div>
<div class="position-absolute bottom-50 end-50"></div>
<div class="position-absolute bottom-0 start-0"></div>
<div class="position-absolute bottom-0 end-0"></div>
</div>
居中元素
此外,还可以使用转换实用程序类.translate-middle
使元素居中。
此类将转换translateX(-50%)
和translateY(-50%)
给元素,结合边缘定位工具集,让你可以绝对居中一个元素。
<div class="position-relative">
<div class="position-absolute top-0 start-0 translate-middle"></div>
<div class="position-absolute top-0 start-50 translate-middle"></div>
<div class="position-absolute top-0 start-100 translate-middle"></div>
<div class="position-absolute top-50 start-0 translate-middle"></div>
<div class="position-absolute top-50 start-50 translate-middle"></div>
<div class="position-absolute top-50 start-100 translate-middle"></div>
<div class="position-absolute top-100 start-0 translate-middle"></div>
<div class="position-absolute top-100 start-50 translate-middle"></div>
<div class="position-absolute top-100 start-100 translate-middle"></div>
</div>
通过添加.translate-middle-x
或.translation-middle-y
类,元素只能在水平或垂直方向上定位。
<div class="position-relative">
<div class="position-absolute top-0 start-0"></div>
<div class="position-absolute top-0 start-50 translate-middle-x"></div>
<div class="position-absolute top-0 end-0"></div>
<div class="position-absolute top-50 start-0 translate-middle-y"></div>
<div class="position-absolute top-50 start-50 translate-middle"></div>
<div class="position-absolute top-50 end-0 translate-middle-y"></div>
<div class="position-absolute bottom-0 start-0"></div>
<div class="position-absolute bottom-0 start-50 translate-middle-x"></div>
<div class="position-absolute bottom-0 end-0"></div>
</div>
示例
以下是这些类的一些真实例子:
Marker
<button type="button" class="btn btn-primary position-relative">
Mails <span class="position-absolute top-0 start-100 translate-middle badge rounded-pill text-bg-secondary">+99 <span class="visually-hidden">unread messages</span></span>
</button>
<div class="position-relative py-2 px-4 text-bg-secondary border border-secondary rounded-pill">
Marker <svg width="1em" height="1em" viewBox="0 0 16 16" class="position-absolute top-100 start-50 translate-middle mt-1" fill="var(--bs-secondary)" xmlns="http://www.w3.org/2000/svg"><path d="M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z"/></svg>
</div>
<button type="button" class="btn btn-primary position-relative">
Alerts <span class="position-absolute top-0 start-100 translate-middle badge border border-light rounded-circle bg-danger p-2"><span class="visually-hidden">unread messages</span></span>
</button>
您可以将这些类与现有组件一起使用来创建新的组件。 请记住,您可以通过向 $position-values
变量添加条目来扩展其功能。
<div class="position-relative m-4">
<div class="progress" role="progressbar" aria-label="Progress" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100" style="height: 1px;">
<div class="progress-bar" style="width: 50%"></div>
</div>
<button type="button" class="position-absolute top-0 start-0 translate-middle btn btn-sm btn-primary rounded-pill" style="width: 2rem; height:2rem;">1</button>
<button type="button" class="position-absolute top-0 start-50 translate-middle btn btn-sm btn-primary rounded-pill" style="width: 2rem; height:2rem;">2</button>
<button type="button" class="position-absolute top-0 start-100 translate-middle btn btn-sm btn-secondary rounded-pill" style="width: 2rem; height:2rem;">3</button>
</div>
CSS
Sass maps
默认的位置实用程序值在Sass映射中声明,然后用于生成我们的实用程序。
$position-values: (
0: 0,
50: 50%,
100: 100%
);
Sass utilities API
定位实用程序在我们的实用程序API中声明为scss/_utilities.scss
。 了解如何使用实用程序API。
"position": (
property: position,
values: static relative absolute fixed sticky
),
"top": (
property: top,
values: $position-values
),
"bottom": (
property: bottom,
values: $position-values
),
"start": (
property: left,
class: start,
values: $position-values
),
"end": (
property: right,
class: end,
values: $position-values
),
"translate-middle": (
property: transform,
class: translate-middle,
values: (
null: translate(-50%, -50%),
x: translateX(-50%),
y: translateY(-50%),
)
),