Bootstrap源码学习笔记之bootstrap进度条
作者：艺术就是爆炸
本文通过源码给大家解析bootstrap进度条样式，分为条纹进度条，动态条纹进度条，层叠进度条和带Label的进度条，下面通过代码给大家简单介绍下，感兴趣的朋友一起看看吧
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脚本之家网站的支持！