进度条(Progress)
使用Bootstrap自定义进度条的文件和示例,这些进度条支持堆叠、动态背景和文字标签。
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工作原理
进度条元件使用两个HTML元素,一些CSS设定宽度以及一些属性设定而成。我们不使用HTML5 progress元素,以确保您可以堆叠进度条,增加动画、更换文字标签。
- 我们在外层使用.progress来指定进度条的最大值。
- 我们在内层使用.progress-bar来指定进度条目前的值。
- .progress-bar需要inline设定、通用类别或是客制CSS来设定它们的宽度。
- .progress-bar也需要一些role和aria属性来使其具有亲和性。
集结以上所有,您将得到以下示例。
<div class="progress">
<div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
</div>
Bootstrap提供几个宽度通用类别设定。基于您的需求,这些将帮助您快速设定进度条。
<div class="progress">
<div class="progress-bar w-75" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
</div>
标签
在.progress-bar中放置文字内容,将标签添加到进度条。
<div class="progress">
<div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">25%</div>
</div>
高度
我们只有在.progress上设置一个height值,如果改变这个值,那么内部的.progress-bar就会自动调整大小。
<div class="progress" style="height: 1px;">
<div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress" style="height: 20px;">
<div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
背景
使用背景通用类别更改各个进度条的外观。
<div class="progress">
<div class="progress-bar bg-success" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar bg-warning" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar bg-danger" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
</div>
多个进度条
如果您需要,可在一个进度条元件中加入多个进度条。
<div class="progress">
<div class="progress-bar" role="progressbar" style="width: 15%" aria-valuenow="15" aria-valuemin="0" aria-valuemax="100"></div>
<div class="progress-bar bg-success" role="progressbar" style="width: 30%" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100"></div>
<div class="progress-bar bg-info" role="progressbar" style="width: 20%" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100"></div>
</div>
条纹的
将.progress-bar-striped加到任何.progress-bar中,就能透过CSS渐变对进度条的背景颜色加上条纹。
<div class="progress">
<div class="progress-bar progress-bar-striped" role="progressbar" style="width: 10%" aria-valuenow="10" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-striped bg-success" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-striped bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-striped bg-warning" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-striped bg-danger" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
</div>
动画条纹
条纹渐变也可以制成动画。将.progress-bar-animated加到.progress-bar中,透过CSS3绘制从右到左的动态效果。
<div class="progress">
<div class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100" style="width: 75%"></div>
</div>
Sass
Variables
$progress-height: 1rem;
$progress-font-size: $font-size-base * .75;
$progress-bg: $gray-200;
$progress-border-radius: $border-radius;
$progress-box-shadow: $box-shadow-inset;
$progress-bar-color: $white;
$progress-bar-bg: $primary;
$progress-bar-animation-timing: 1s linear infinite;
$progress-bar-transition: width .6s ease;
Keyframes
Used for creating the CSS animations for .progress-bar-animated
. Included in
scss/_progress-bar.scss
.
@if $enable-transitions {
@keyframes progress-bar-stripes {
0% { background-position-x: $progress-height; }
}
}