Bootstrap ProgressBars Tutorial

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Progress Bar
Striped Progress Bar
Stacked Progress Bar

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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