Bootstrap 4 - Collapse

Collapse component is used to show or hide the content by using .collapse class. The content can be collapsed by adding data-toggle="collapse" attribute anchor or button element. The id of these elements references to the id of the content to collapse the data.
You can collapse the content with <a> tag by using href value of the ID of the content to collapse.
The following example demonstrates this −
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" 
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      
      <title>Bootstrap 4 Example</title>
   </head>
   
   <body>
      <div class = "container">
         <h2>Collapse with Link</h2>
         <p>
            <a class = "btn btn-info" data-toggle = "collapse" 
               href = "#collapsewithlink" role = "button" aria-expanded = "false" 
               aria-controls = "collapsewithlink">Click Me</a>
         </p>
         
         <div class = "collapse" id = "collapsewithlink">
            <div class = "card card-body">
               Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod 
               tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim 
               veniam, quis nostrud exercitation.
            </div>
         </div>
      </div>
      
      <!-- jQuery first, then Popper.js, then Bootstrap JS -->
      <script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js" 
         integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" 
         integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" 
         integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>
It will produce the following result −

Click Me

You can collapse the content with <button> tag by using data-target attribute with value of the ID of the content to collapse.
The following example demonstrates this −
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      <title>Bootstrap 4 Example</title>
   </head>
   
   <body>
      <div class = "container">
         <h2>Collapse with Button</h2>
         <p>
            <button class = "btn btn-indo" type = "button" data-toggle = "collapse" 
               data-target = "#collapsewithbutton" aria-expanded = "false" 
               aria-controls = "collapsewithbutton">Click Me</button>
         </p>
         
         <div class = "collapse" id = "collapsewithbutton">
            <div class = "card card-body">
               Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod 
               tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim 
               veniam, quis nostrud exercitation.
            </div>
         </div>
      </div>
      
      <!-- jQuery first, then Popper.js, then Bootstrap JS -->
      <script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js" 
         integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" 
         integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" 
         integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>
It will produce the following result −

Click Me

You can use collapsible content to make an accordion which is often used for content such as FAQs, overviews, etc.
The below example specifies a simple accordion by extending the card component −
<html lang = "en">
   <head>
      <!-- Meta tags -->
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1, shrink-to-fit = no">
      
      <!-- Bootstrap CSS -->
      <link rel = "stylesheet" 
         href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" 
         integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" 
         crossorigin = "anonymous">
      
      <title>Bootstrap 4 Example</title>
   </head>
   
   <body>
      <div class = "container">
         <h2>Accordion </h2>
         <div id = "accordion">
            <div class = "card">
               <div class = "card-header">
                  <a class = "card-link" data-toggle = "collapse" href = "#collapseOne">
                     Accordion #1
                  </a>
               </div>
               
               <div id = "collapseOne" class = "collapse show" data-parent = "#accordion">
                  <div class = "card-body">Content for Accordion #1.</div>
               </div>
            </div>
            
            <div class = "card">
               <div class = "card-header">
                  <a class = "collapsed card-link" data-toggle = "collapse" href = "#collapseTwo">
                     Accordion #2
                  </a>
               </div>
               
               <div id = "collapseTwo" class = "collapse" data-parent = "#accordion">
                  <div class = "card-body">Content for Accordion #2.</div>
               </div>
            </div>
            
            <div class = "card">
               <div class = "card-header">
                  <a class = "collapsed card-link" data-toggle = "collapse" href = "#collapseThree">
                     Accordion #3
                  </a>
               </div>
               
               <div id = "collapseThree" class = "collapse" data-parent = "#accordion">
                  <div class = "card-body"> Content for Accordion #3.</div>
               </div>
            </div>
            
         </div>
      </div>
    
      <!-- jQuery first, then Popper.js, then Bootstrap JS -->
      <script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js" 
         integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" 
         integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" 
         crossorigin = "anonymous">
      </script>
      
      <script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" 
         integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" 
         crossorigin = "anonymous">
      </script>
      
   </body>
</html>
It will produce the following result −

    26 Lectures 
     2 hours 

 Anadi Sharma

    54 Lectures 
     4.5 hours 

 Frahaan Hussain

    161 Lectures 
     14.5 hours 

 Eduonix Learning Solutions

    20 Lectures 
     4 hours 

 Azaz Patel

    15 Lectures 
     1.5 hours 

 Muhammad Ismail

    62 Lectures 
     8 hours 

 Yossef Ayman Zedan
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