今天給大家分享一個(gè)
Bootstrap
教程http://www.maiziedu.com/course/543/,是關(guān)于進(jìn)度條組件的。眾所周知,在網(wǎng)頁中,進(jìn)度條的效果并不少見,如:平分系統(tǒng)、加載狀態(tài)等,進(jìn)度條組件使用了
css3
的
transition
和
animation
屬性來完成一些特效,這些特效在
IE9
及
IE9
以下版本、
Firefox
的老版本中并不支持,
Opera 12
不支持
animation
屬性。
進(jìn)度條和其他獨(dú)立組件一樣,開發(fā)者可以根據(jù)自己的需要選擇對應(yīng)的版本:
LESS: progress-bars.less
SASS: _progress-bars.scss
基礎(chǔ)進(jìn)度條
實(shí)現(xiàn)原理:
需要兩個(gè)容器,外容器使用類名
.progress
,子容器使用類名
.progress-bar;
其中
.progress
用來設(shè)置進(jìn)度條容器的背景色,容器的高度,間距等;而
.progress-bar
設(shè)置進(jìn)度方向,進(jìn)度條的背景色和過度效果;下面是
css
源碼:
.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
屬性作用:告訴搜索引擎這個(gè)
div
的作用是進(jìn)度條;
aria-valuenow=”30”
屬性作用:當(dāng)前進(jìn)度條的進(jìn)度為
40%
;
aria-valuemin=”0”
屬性作用:進(jìn)度條的最小值為
0%
;
aria-valuemax=”100”
屬性作用:進(jìn)度條的最大值為
100%
;
可以將設(shè)置了
.sr-only
類的
<span>
標(biāo)簽從進(jìn)度條組件中移除,而讓當(dāng)前進(jìn)度顯示出來;
<div class="progress">
<div class="progress-bar" style="width:40%;" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" >40%</div>
</div>
彩色進(jìn)度條
彩色進(jìn)度條和警告進(jìn)度條一樣,為了能給用戶一個(gè)更好的體驗(yàn),也根據(jù)不同的狀態(tài)配置了不同的進(jìn)度條顏色,主要包括以下四種:
progress-bar-info:
表示信息進(jìn)度條,藍(lán)色
progress-bar-success:
表示成功進(jìn)度條,綠色
progress-bar-warning:
表示警告進(jìn)度條,黃色
progress-bar-danger:
表示錯(cuò)誤進(jìn)度條,紅色
css
源碼:
.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:
只需要在基礎(chǔ)進(jìn)度條上增加對應(yīng)的類名即可
例子:
<h1>
彩色進(jìn)度條
</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:
條紋進(jìn)度條
條紋進(jìn)度條采用
css3
的線性漸變來實(shí)現(xiàn),并未借助任何圖片,使用條紋進(jìn)度條只需在進(jìn)度條的容器
.progress
基礎(chǔ)上追加類名
”progress-striped”,
如果要進(jìn)度條紋像彩色進(jìn)度一樣,具有彩色效果,只需在進(jìn)度條上增加相應(yīng)得顏色類名
下面是
.progress-striped
樣式源碼:
.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;
}
條紋進(jìn)度對應(yīng)的每種狀態(tài)也有不同的顏色
.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);
}
下面來看看條紋進(jìn)度條的運(yùn)用:
<h1>
條紋進(jìn)度條
</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>
動態(tài)條紋進(jìn)度條
在進(jìn)度條
.progress
、
.progress-striped
兩個(gè)類的基礎(chǔ)上在加入類名
.active
就能實(shí)現(xiàn)動態(tài)條紋進(jìn)度條。
其實(shí)現(xiàn)原理主要是通過
css3
的
animation
來完成。首先通過
@keyframes
創(chuàng)建了一個(gè)
progress-bar-stripes
的動畫,這個(gè)動畫主要做了一件事,就是改變背景圖像的位置,也就是
background-position
的值。因?yàn)闂l紋進(jìn)度條是通過
CSS3
的線性漸變來制作的,而
linear-gradient
實(shí)現(xiàn)的正是對應(yīng)背景中的背景圖片
下面是
css
源碼:
@-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
僅僅是創(chuàng)建了一個(gè)動畫效果,如果要讓進(jìn)度條真正的動起來,我們需要通過一定的方式調(diào)用
@keyframes
創(chuàng)建的動畫
“progress-bar-stripes”
,并且通過一個(gè)事件觸發(fā)動畫生效。在
Bootstrap
框架中,通過給進(jìn)度條容器
“progress”
添加一個(gè)類名
“active”
,并讓文檔加載完成就觸
“progress-bar-stripes”
動畫生效
調(diào)用動畫對應(yīng)的樣式代碼如下:
.progress.active .progress-bar {
-webkit-animation: progress-bar-stripes 2s linear infinite;
animation: progress-bar-stripes 2s linear infinite;
}
例子:
<h1>
動態(tài)條紋進(jìn)度條
</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(由于是直接從網(wǎng)頁上結(jié)果來的圖,這里并看不到它的動態(tài)效果):
層疊進(jìn)度條:
層疊進(jìn)度可以將不容狀態(tài)的進(jìn)度條放在一起,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>
除了層疊彩色進(jìn)度條之外,還可以層疊條紋進(jìn)度條,或者說條紋進(jìn)度條和彩色進(jìn)度條混合層疊,僅需要在
“progress”
容器中添加對應(yīng)的進(jìn)度條,同樣要注意,層疊的進(jìn)度條之和不能大于
100%
。
下面來看一個(gè)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>
原文來自:博客園