Bootstrap ProgressBars Tutorial

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1- Progress Bar

Progress Bar is a visual interface component that describes the progress of a work, for example, download progress, installation progress . The Progress Bar allows the user to know the percentage of completion, and estimate the time when the work will be completed.
Bootstrap provides a few classes for you to build a  Progress Bar.
  • .progress-bar: This class is used for the element denoting current work progress.
  • .progress: This class is used for the element wraping the .progress-bar element, which denotes the maximum value of progress bar.
<div class="progress">

   <div class="progress-bar"
      role="progressbar"
      aria-valuenow="80"
      aria-valuemin="0" aria-valuemax="100"
      style="width:80%">
      80%
   </div>

</div>
Explanation about  code:
Thuộc tính
(Attribute)
Description
aria-valuemin
aria-valuemax
aria-valuenow
The minimum value, maximum value and current value of progress. These attributes do not serve as displaying the length of progress-bar which you see on the interface. But these attributes allow you to get values through Javascript.
style="width:80%" This is the way for displaying the length (percentage) of progress-bar which you see on the interface.
Look at full example:
progressbar-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Progress Bar Example</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
   </head>
   <body>
      <div class="container mt-3">
         <h4>Progress Bar:</h4>

         <div class="progress">
            <div class="progress-bar" role="progressbar"
               aria-valuenow="80"
               aria-valuemin="0" aria-valuemax="100"
               style="width:80%">
               80%
            </div>
         </div>

      </div>

      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
   </body>
</html>

Colors:

You can apply background color to the  Progress-bar. Below is the list of predefined background colors of the  Bootstrap.
  • bg-primary
  • bg-secondary
  • bg-success
  • bg-danger
  • bg-warning
  • bg-info
  • bg-light
  • bg-dark
  • bg-muted
  • bg-white
colored-progressbar-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Progress Bar Example</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
      <style>
      .progress {
         margin: 5px 0px;
      }
      </style>
   </head>
   <body>
      <div class="container mt-3">
         <h4>Colored Progress Bars:</h4>

         <div class="progress">
            <div class="progress-bar bg-success text-left"
               role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width:40%">
               40% Complete (.bg-success)
            </div>
         </div>

         <div class="progress">
            <div class="progress-bar bg-info text-left"
               role="progressbar" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100" style="width:50%">
               50% Complete (.bg-info)
            </div>
         </div>

         <div class="progress">
            <div class="progress-bar bg-warning text-left"
               role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width:60%">
               60% Complete (.bg-warning)
            </div>
         </div>

      </div>

      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>

   </body>
</html>

Height:

You need to set up only the height of  .progress, all inner  .progress-bar will also be automatically changed height.
Set Height for Progress
<div class="progress" style="height:5px;">
   <div class="progress-bar bg-success" role="progressbar"
      aria-valuenow="80"
      aria-valuemin="0" aria-valuemax="100"
      style="width:80%">
   </div>
</div>

<br>

<div class="progress" style="height:55px;">
   <div class="progress-bar" role="progressbar"
      aria-valuenow="30"
      aria-valuemin="0" aria-valuemax="100"
      style="width:30%">
   </div>
</div>

2- Striped Progress Bar

Use the .striped-progress-bar class with the  .progress-bar, you will get a progress bar with stripes
Striped Progress Bar
<div class="progress">

   <div class="progress-bar progress-bar-striped" role="progressbar"
      aria-valuenow="80"
      aria-valuemin="0" aria-valuemax="100"
      style="width:80%">
      80%
   </div>

</div>
Combine the  .progress-bar-striped class & .progress-bar-animated class, you can create a progress bar with animation effect.
Animated Progress Bar
<div class="progress">

   <div class="progress-bar progress-bar-striped progress-bar-animated"
      role="progressbar"
      aria-valuenow="80"
      aria-valuemin="0" aria-valuemax="100"
      style="width:80%">
      80%
   </div>

</div>

3- Stacked Progress Bar

Progress-bars can also be stacked each other, which is similar to the following illustration.
Stacked Progress Bar
<div class="progress">

   <div class="progress-bar" role="progressbar" style="width: 15%"
      aria-valuenow="15" aria-valuemin="0" aria-valuemax="100">
      Music 3GB
   </div>

   <div class="progress-bar bg-success" role="progressbar" style="width: 30%"
      aria-valuenow="30" aria-valuemin="0" aria-valuemax="100">
      Video 6GB
   </div>

   <div class="progress-bar bg-info" role="progressbar" style="width: 20%"
      aria-valuenow="20" aria-valuemin="0" aria-valuemax="100">
      Picture 4GB
   </div>

</div>

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