
麦子学院 2016-07-03 00:03
Bootstrap进度条组件学习教程
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今天给大家分享一个
Bootstrap
教程http://www.maiziedu.com/course/543/,是关于进度条组件的。众所周知,在网页中,进度条的效果并不少见,如:平分系统、加载状态等,进度条组件使用了
css3
的
transition
和
animation
属性来完成一些特效,这些特效在
IE9
及
IE9
以下版本、
Firefox
的老版本中并不支持,
Opera 12
不支持
animation
属性。
进度条和其他独立组件一样,开发者可以根据自己的需要选择对应的版本:
LESS: progress-bars.less
SASS: _progress-bars.scss
基础进度条
实现原理:
需要两个容器,外容器使用类名
.progress
,子容器使用类名
.progress-bar;
其中
.progress
用来设置进度条容器的背景色,容器的高度,间距等;而
.progress-bar
设置进度方向,进度条的背景色和过度效果;下面是
css
源码:
.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;
transition: width .6s ease;
}
例子:
<div class="progress">
<div class="progress-bar" style="width:30%;" role="progressbar" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100">
<span class="sr-only">30%</span>
</div>
</div>

role
属性作用:告诉搜索引擎这个
div
的作用是进度条;
aria-valuenow=”30”
属性作用:当前进度条的进度为
40%
;
aria-valuemin=”0”
属性作用:进度条的最小值为
0%
;
aria-valuemax=”100”
属性作用:进度条的最大值为
100%
;
可以将设置了
.sr-only
类的
<span>
标签从进度条组件中移除,而让当前进度显示出来;
<div class="progress">
<div class="progress-bar" style="width:40%;" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" >40%</div>
</div>

彩色进度条
彩色进度条和警告进度条一样,为了能给用户一个更好的体验,也根据不同的状态配置了不同的进度条颜色,主要包括以下四种:
progress-bar-info:
表示信息进度条,蓝色
progress-bar-success:
表示成功进度条,绿色
progress-bar-warning:
表示警告进度条,黄色
progress-bar-danger:
表示错误进度条,红色
css
源码:
.progress-bar-success {
background-color: #5cb85c;
}
.progress-bar-info {
background-color: #5bc0de;
}
.progress-bar-warning {
background-color: #f0ad4e;
}
.progress-bar-danger {
background-color: #d9534f;
}
使用方法:
只需要在基础进度条上增加对应的类名即可
例子:
<h1>
彩色进度条
</h1>
<div class="progress">
<div class="progress-bar progress-bar-success" style="width:25%;" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">25%</div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-info" style="width:40%;" role="progressbar" aria-valuenow="40" aria-valuemax="100" aria-valuemin="0">40%</div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-warning" style="width:80%;" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">80%</div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-danger" style="width:60%;" role="progressbar" aria-valuenow="40" aria-valuemax="100" aria-valuemin="0">60%</div>
</div>
效果如下:

条纹进度条
条纹进度条采用
css3
的线性渐变来实现,并未借助任何图片,使用条纹进度条只需在进度条的容器
.progress
基础上追加类名
”progress-striped”,
如果要进度条纹像彩色进度一样,具有彩色效果,只需在进度条上增加相应得颜色类名
下面是
.progress-striped
样式源码:
.progress-striped .progress-bar {
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: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-size: 40px 40px;
}
条纹进度对应的每种状态也有不同的颜色
.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: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: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: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: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);
}
下面来看看条纹进度条的运用:
<h1>
条纹进度条
</h1>
<div class="progress progress-striped">
<div class="progress-bar progress-bar-success" style="width:25%;" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">25%</div>
</div>
<div class="progress progress-striped">
<div class="progress-bar progress-bar-info" style="width:40%;" role="progressbar" aria-valuenow="40" aria-valuemax="100" aria-valuemin="0">40%</div>
</div>
<div class="progress progress-striped">
<div class="progress-bar progress-bar-warning" style="width:80%;" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">80%</div>
</div>
<div class="progress progress-striped">
<div class="progress-bar progress-bar-danger" style="width:60%;" role="progressbar" aria-valuenow="40" aria-valuemax="100" aria-valuemin="0">60%</div>
</div>

动态条纹进度条
在进度条
.progress
、
.progress-striped
两个类的基础上在加入类名
.active
就能实现动态条纹进度条。
其实现原理主要是通过
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
下面是
css
源码:
@-webkit-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;
}
}
@keyframes
仅仅是创建了一个动画效果,如果要让进度条真正的动起来,我们需要通过一定的方式调用
@keyframes
创建的动画
“progress-bar-stripes”
,并且通过一个事件触发动画生效。在
Bootstrap
框架中,通过给进度条容器
“progress”
添加一个类名
“active”
,并让文档加载完成就触
“progress-bar-stripes”
动画生效
调用动画对应的样式代码如下:
.progress.active .progress-bar {
-webkit-animation: progress-bar-stripes 2s linear infinite;
animation: progress-bar-stripes 2s linear infinite;
}
例子:
<h1>
动态条纹进度条
</h1>
<div class="progress progress-striped active">
<div class="progress-bar progress-bar-success" style="width:25%;" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">25%</div>
</div>
<div class="progress progress-striped active">
<div class="progress-bar progress-bar-info" style="width:40%;" role="progressbar" aria-valuenow="40" aria-valuemax="100" aria-valuemin="0">40%</div>
</div>
<div class="progress progress-striped active">
<div class="progress-bar progress-bar-warning" style="width:80%;" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">80%</div>
</div>
<div class="progress progress-striped active">
<div class="progress-bar progress-bar-danger" style="width:60%;" role="progressbar" aria-valuenow="40" aria-valuemax="100" aria-valuemin="0">60%</div>
</div>
效果如下(由于是直接从网页上结果来的图,这里并看不到它的动态效果):

层叠进度条:
层叠进度可以将不容状态的进度条放在一起,按水平方式排列
例子:
<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>

除了层叠彩色进度条之外,还可以层叠条纹进度条,或者说条纹进度条和彩色进度条混合层叠,仅需要在
“progress”
容器中添加对应的进度条,同样要注意,层叠的进度条之和不能大于
100%
。
下面来看一个例子:
<div class="progress">
<div class="progress-bar progress-bar-success" style="width:20%"></div>
<div class="progress-bar progress-bar-info" style="width:20%"></div>
<div class="progress-bar progress-bar-warning" style="width:30%"></div>
<div class="progress-bar progress-bar-danger" style="width:15%"></div></div><div class="progress">
<div class="progress-bar progress-bar-success progress-bar-striped" style="width:20%"></div>
<div class="progress-bar progress-bar-info progress-bar-striped" style="width:20%"></div>
<div class="progress-bar progress-bar-striped progress-bar-warning" style="width:30%"></div>
<div class="progress-bar progress-bar-danger progress-bar-striped" style="width:15%"></div></div><div class="progress">
<div class="progress-bar progress-bar-success" style="width:20%"></div>
<div class="progress-bar progress-bar-info progress-bar-striped" style="width:20%"></div>
<div class="progress-bar progress-bar-warning" style="width:30%"></div>
<div class="progress-bar progress-bar-danger progress-bar-striped" style="width:15%"></div></div>

原文来自:博客园