Bootstrap源码学习笔记之bootstrap进度条

基本样式

要实现进度条效果要使用两个容器,外容器使用“progress”样式,子容器使用“progress-bar”样式。例如:

<div class="progress">
  <div class="progress-bar" style="width:40%"></div>
</div>

progress样式主要设置进度条容器的背景色,容器高度、间距等,progress-bar样式设置进度,主要是设置了进度条的背景颜色和过渡效果。实现源码如下:

.progress {
 height: 20px;
 margin-bottom: 20px;
 overflow: hidden;
 background-color: #f5f5f5;
 border-radius: 4px;
 -webkit-box-shadow: inset 0 1px 2px rgba(0, 0, 0, .1);
     box-shadow: inset 0 1px 2px rgba(0, 0, 0, .1);
}
.progress-bar {
 float: left;
 width: 0;
 height: 100%;
 font-size: 12px;
 line-height: 20px;
 color: #fff;
 text-align: center;
 background-color: #428bca;
 -webkit-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, .15);
     box-shadow: inset 0 -1px 0 rgba(0, 0, 0, .15);
 -webkit-transition: width .6s ease;
    -o-transition: width .6s ease;
     transition: width .6s ease;
}

彩色进度条

在基础的进度条上追加对应的类名即可:

.progress-bar-info:信息进度条,进度条颜色为蓝色
.progress-bar-success:成功进度条,进度条颜色为绿色
.progress-bar-warning:警告进度条,进度条颜色为黄色
.progress-bar-danger:错误进度条,进度条颜色为红色

实现源码如下:

.progress-bar-success {
 background-color: #5cb85c;
}
.progress-bar-info {
 background-color: #5bc0de;
}
.progress-bar-warning {
 background-color: #f0ad4e;
}
.progress-bar-danger {
 background-color: #d9534f;
}

条纹进度条

要实现条纹进度条效果只需要在进度条的容器“progress”基础上增加类名“progress-striped”即可。
实现源码如下:

.progress-striped .progress-bar,
.progress-bar-striped {
 background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:   -o-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:     linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 -webkit-background-size: 40px 40px;
     background-size: 40px 40px;
}
.progress-striped .progress-bar-success {
 background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:   -o-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:     linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
}
.progress-striped .progress-bar-info {
 background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:   -o-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:     linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
}
.progress-striped .progress-bar-warning {
 background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:   -o-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:     linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
}
.progress-striped .progress-bar-danger {
 background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:   -o-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
 background-image:     linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
}

动态条纹进度条

在进度条“progress progress-striped”两个类的基础上再加入“active”类名即可。例如:

<div class="progress progress-striped active">
  <div class="progress-bar progress-bar-success" style="width:40%"></div>
</div>

实现原理主要通过CSS3的animation来完成。首先通过@keyframes创建了一个progress-bar-stripes的动画,这个动画主要做了一件事,就是改变背景图像的位置,也就是background-position的值。因为条纹进度条是通过CSS3的线性渐变来制作的,而linear-gradient实现的正是对应背景中的背景图片。动画的实现源码如下:

@-webkit-keyframes progress-bar-stripes {
 from {
  background-position: 40px 0;
 }
 to {
  background-position: 0 0;
 }
}
@-o-keyframes progress-bar-stripes {
 from {
  background-position: 40px 0;
 }
 to {
  background-position: 0 0;
 }
}
@keyframes progress-bar-stripes {
 from {
  background-position: 40px 0;
 }
 to {
  background-position: 0 0;
 }
}

调用动画的实现源码如下:

.progress.active .progress-bar,
.progress-bar.active {
 -webkit-animation: progress-bar-stripes 2s linear infinite;
    -o-animation: progress-bar-stripes 2s linear infinite;
     animation: progress-bar-stripes 2s linear infinite;
}

层叠进度条

层叠进度条可以将不同状态的进度条放置在一起,按水平方式排列。例如:

<div class="progress">
  <div class="progress-bar progress-bar-success" style="width:20%"></div>
  <div class="progress-bar progress-bar-info" style="width:10%"></div>
  <div class="progress-bar progress-bar-warning" style="width:30%"></div>
  <div class="progress-bar progress-bar-danger" style="width:15%"></div>
</div>

我们可以发现,层叠进度条并没有额外的样式代码,之所以这样就能生效是因为在“progress-bar”上有一个左浮动的样式。要注意,层叠进度条宽度之和不能大于100%。

带Label的进度条

要实现带Label的进度条,只需要在进度条中添加你需要的值即可。例如:

<div class="progress">
  <div class="progress-bar progress-bar-success" style="width:20%">20%</div>
</div>

要是那进度条的值为0%时,可以这么写:

<div class="progress">
  <div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100">0%</div>
</div>

以上所述是小编给大家介绍的 Bootstrap源码学习笔记之bootstrap进度条,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对呐喊教程网站的支持!

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