Bulma - Dropdown

Bulma provides toggelable dropdown menus for displaying related links in a list format. You need to use base class as .dropdown with the below dropdown elements −
dropdown
It is a main container, to wrap the dropdown menu.
dropdown-trigger
It is a top part of the table that contains element for table header rows.
dropdown-menu
It is a toggable menu that contains the related links.
dropdown-content
It specifies the dropdown box with white background.
dropdown-item
It defines each item of the dropdown.
dropdown-divider
It specifies the horizontal line to divide the dropdown items.
You can also use anchor tag (<a>) to make dropdown-item as link. The below example shows how to display the basic dropdown along with linking to an item, dropdown divider in the page by using above dropdown elements −
<!DOCTYPE html>
<html>
   <head>
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <title>Bulma Elements Example</title>
      <link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css">
      <script src = "https://use.fontawesome.com/releases/v5.1.0/js/all.js"></script>
   </head>
   
   <body>
      <section class = "section">
         <div class = "container">
            <span class = "title">
               Basic Dropdown
            </span>
            <br>
            <br>
            
            <div class = "dropdown">
               <div class = "dropdown-trigger">
                  <button class = "button" aria-haspopup = "true" aria-controls = "dropdown-menu">
                     <span>Countries</span>
                     <span class = "icon is-small">
                        <i class = "fa fa-angle-down" aria-hidden="true"></i>
                     </span>
                  </button>
               </div>
               <div class = "dropdown-menu" id = "dropdown-menu" role = "menu">
                  <div class = "dropdown-content">
                     <a href = "#" class = "dropdown-item">India</a>
                     <a class = "dropdown-item">England</a>
                     <a href = "#" class = "dropdown-item is-active">Australia</a>
                     <a href = "#" class = "dropdown-item">Srilanka</a>
                     <hr class = "dropdown-divider">
                     <a href = "#" class = "dropdown-item">South Africa</a>
                  </div>
               </div>
            </div>
            <script>
               //DOMContentLoaded - it fires when initial HTML document has been completely loaded
               document.addEventListener('DOMContentLoaded', function () {
                  // querySelector - it returns the element within the document that matches the specified selector
                  var dropdown = document.querySelector('.dropdown');
                    
                  //addEventListener - attaches an event handler to the specified element.
                  dropdown.addEventListener('click', function(event) {
                    
                     //event.stopPropagation() - it stops the bubbling of an event to parent elements, by preventing parent event handlers from being executed
                     event.stopPropagation();
                      
                     //classList.toggle - it toggles between adding and removing a class name from an element
                     dropdown.classList.toggle('is-active');
                  });
               });        
            </script>
         </div>
         
      </section>
   </body>
   
</html>
Execute the above code and you will get the below output −
The dropdown component uses is-hoverable class to display the related links in a list format, when you hover the dropdown-trigger element.
The below example specifies hoverable dropdown in the page −
<!DOCTYPE html>
<html>
   <head>
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <title>Bulma Elements Example</title>
      <link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css">
      <script src = "https://use.fontawesome.com/releases/v5.1.0/js/all.js"></script>
   </head>
   
   <body>
      <section class = "section">
         <div class = "container">
            <span class = "title">
               Hoverable Dropdown
            </span>
            <br>
            <br>
            
            <div class = "dropdown is-hoverable">
               <div class = "dropdown-trigger">
                  <button class = "button" aria-haspopup = "true" aria-controls = "dropdown-menu4">
                     <span>Countries</span>
                     <span class = "icon is-small">
                        <i class = "fas fa-angle-down" aria-hidden = "true"></i>
                     </span>
                  </button>
               </div>
               <div class = "dropdown-menu" id = "dropdown-menu" role = "menu">
                  <div class = "dropdown-content">
                     <a href = "#" class = "dropdown-item">India</a>
                     <a class = "dropdown-item">England</a>
                     <a href = "#" class = "dropdown-item is-active">Australia</a>
                     <a href = "#" class = "dropdown-item">Srilanka</a>
                     <hr class = "dropdown-divider">
                     <a href = "#" class = "dropdown-item">South Africa</a>
                  </div>
               </div>
            </div>
            <script>           
               document.addEventListener('DOMContentLoaded', function () {
                  var dropdown = document.querySelector('.dropdown');
                  dropdown.addEventListener('click', function(event) {
                     event.stopPropagation();                          
                     dropdown.classList.toggle('is-active');
                  });
               });
            </script>
         </div>
         
      </section>
   </body>
   
</html>
It displays the below output −
Bulma allows displaying right aligned dropdown by using is-right modifier as shown in the below example −
<!DOCTYPE html>
<html>
   <head>
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <title>Bulma Elements Example</title>
      <link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css">
      <script src = "https://use.fontawesome.com/releases/v5.1.0/js/all.js"></script>
   </head>
   
   <body>
      <section class = "section">
         <div class = "container">
            <span class = "title">
               Right Aligned Dropdown
            </span>
            <br>
            <br>
            
            <div class = "dropdown is-right">
               <div class = "dropdown-trigger">
                  <button class = "button" aria-haspopup = "true" aria-controls = "dropdown-menu4">
                     <span>Countries</span>
                     <span class = "icon is-small">
                        <i class = "fas fa-angle-down" aria-hidden = "true"></i>
                     </span>
                  </button>
               </div>
               
               <div class = "dropdown-menu" id = "dropdown-menu" role = "menu">
                  <div class = "dropdown-content">
                     <a href = "#" class = "dropdown-item">India</a>
                     <a class = "dropdown-item">England</a>
                     <a href = "#" class = "dropdown-item is-active">Australia</a>
                     <a href = "#" class = "dropdown-item">Srilanka</a>
                     <hr class = "dropdown-divider">
                     <a href = "#" class = "dropdown-item">South Africa</a>
                  </div>
               </div>
            </div>
            
            <script>           
               document.addEventListener('DOMContentLoaded', function () {
                  var dropdown = document.querySelector('.dropdown');                         
                  dropdown.addEventListener('click', function(event) {
                     event.stopPropagation();                          
                     dropdown.classList.toggle('is-active');
                  });
               });
            </script>
         </div>
         
      </section>
   </body>
   
</html>
It displays the below output −
Bulma allows displaying the dropdown menu above the dropdown button by using is-up modifier as shown in the below example −
<!DOCTYPE html>
<html>
   <head>
      <meta charset = "utf-8">
      <meta name = "viewport" content = "width = device-width, initial-scale = 1">
      <title>Bulma Elements Example</title>
      <link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css">
      <script src = "https://use.fontawesome.com/releases/v5.1.0/js/all.js"></script>
   </head>
   
   <body>
      <section class = "section">
         <div class = "container">
            <span class = "title">
               Dropup Menu
            </span>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            <br>
            
            <div class = "dropdown is-up">
               <div class = "dropdown-trigger">
                  <button class = "button" aria-haspopup = "true" aria-controls = "dropdown-menu4">
                     <span>Countries</span>
                     <span class = "icon is-small">
                        <i class = "fas fa-angle-down" aria-hidden = "true"></i>
                     </span>
                  </button>
               </div>
               
               <div class = "dropdown-menu" id = "dropdown-menu" role = "menu">
                  <div class = "dropdown-content">
                     <a href = "#" class = "dropdown-item">India</a>
                     <a class = "dropdown-item">England</a>
                     <a href = "#" class = "dropdown-item is-active">Australia</a>
                     <a href = "#" class = "dropdown-item">Srilanka</a>
                     <hr class = "dropdown-divider">
                     <a href = "#" class = "dropdown-item">South Africa</a>
                  </div>
               </div>
            </div>
            
            <script>           
               document.addEventListener('DOMContentLoaded', function () {
                  var dropdown = document.querySelector('.dropdown');
                  
                  dropdown.addEventListener('click', function(event) {
                     event.stopPropagation();
                     dropdown.classList.toggle('is-active');
                  });
               });
            </script>
         </div>
         
      </section>
   </body>
   
</html>
It displays the below output −
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