欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  web前端

详解Bootstrap进度条组件 - 洛水三千

程序员文章站 2022-05-18 21:53:59
...
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>
详解Bootstrap进度条组件 - 洛水三千

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>
详解Bootstrap进度条组件 - 洛水三千

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:

详解Bootstrap进度条组件 - 洛水三千

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>
详解Bootstrap进度条组件 - 洛水三千

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):

详解Bootstrap进度条组件 - 洛水三千

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>
详解Bootstrap进度条组件 - 洛水三千

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>
详解Bootstrap进度条组件 - 洛水三千