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Dropdown

Create different kinds of toggleable dropdown menus with the dropdown component.

Introduction

The dropdown component in Luda includes two parts, a trigger and a menu. It can be created with these classes: .dropdown-{type}, .dropdown-menu and .dropdown-items.

The dropdown component can be controlled with the Tab key, the Enter key, the Esc key, and the arrow keys.

Let’s have a look at how to create different type dropdowns through the below examples.

Absolute Dropdown

An absolute dropdown should be wrapped in a container which has the .dropdown-absolute class.

<div class="dropdown-absolute">
  <button class="btn btn-primary btn-ico-right"> <!-- The trigger -->
    Dropdown <i class="ico ico-down"></i>
  </button>
  <div class="dropdown-menu"> <!-- The menu -->
    <div class="dropdown-items">
      <div class="btns-y"> <!-- Use a button group as the dropdown items -->
        <button class="btn btn-hollow-primary">One</button>
        <button class="btn btn-hollow-primary">Two</button>
        <button class="btn btn-hollow-primary">Three</button>
      </div>
    </div>
  </div>
</div>

Style Modifiers

Add the .dropdown-top class to an absolute dropdown to align its menu on the top of its trigger.

<div class="dropdown-absolute dropdown-top">
  <button class="btn btn-primary btn-ico-right">
    Dropdown <i class="ico ico-up"></i>
  </button>
  <div class="dropdown-menu">
    <div class="dropdown-items">
      <div class="btns-y">
        <button class="btn btn-primary">One</button>
        <button class="btn btn-primary">Two</button>
        <button class="btn btn-primary">Three</button>
      </div>
    </div>
  </div>
</div>

Add the .dropdown-right class to an absolute dropdown to align its menu on the right of its trigger.

<div class="dropdown-absolute dropdown-right">
  <button class="btn btn-primary btn-ico-right">
    Dropdown <i class="ico ico-right"></i>
  </button>
  <div class="dropdown-menu">
    <div class="dropdown-items">
      <div class="btns-y">
        <button class="btn btn-primary">One</button>
        <button class="btn btn-primary">Two</button>
        <button class="btn btn-primary">Three</button>
      </div>
    </div>
  </div>
</div>

Add the .dropdown-left class to an absolute dropdown to align its menu on the left of its trigger.

<div class="dropdown-absolute dropdown-left">
  <button class="btn btn-primary btn-ico-left">
    Dropdown <i class="ico ico-left"></i>
  </button>
  <div class="dropdown-menu">
    <div class="dropdown-items">
      <div class="btns-y">
        <button class="btn btn-primary">One</button>
        <button class="btn btn-primary">Two</button>
        <button class="btn btn-primary">Three</button>
      </div>
    </div>
  </div>
</div>

Add the .dropdown-align-right class to an absolute dropdown to align its menu to the right edge of its trigger.

<div class="dropdown-absolute dropdown-align-right">
  <button class="btn btn-primary btn-ico-right">
    Dropdown <i class="ico ico-down"></i>
  </button>
  <div class="dropdown-menu">
    <div class="dropdown-items">
      <div class="btns-y">
        <button class="btn btn-primary">One</button>
        <button class="btn btn-primary">Two</button>
        <button class="btn btn-primary">A long long line</button>
      </div>
    </div>
  </div>
</div>

Static Dropdown

A static dropdown is in the normal document flow, it should be wrapped in a container which has the .dropdown-static class.

<div class="dropdown-static">
  <button class="btn btn-text-dark btn-ico-right">
    Dropdown <i class="ico ico-down"></i>
  </button>
  <div class="dropdown-menu">
    <div class="dropdown-items">
      <div class="btns-y">
        <button class="btn btn-text-dark">One</button>
        <button class="btn btn-text-dark">Two</button>
        <button class="btn btn-text-dark">Three</button>
      </div>
    </div>
  </div>
</div>

Nested Dropdowns

Nested Absolute Dropdowns

Absolute dropdowns can be nested. Let’s see the below example for detail.

<div class="dropdown-absolute">
  <button class="btn btn-primary">Drink something?</button>
  <div class="dropdown-menu">
    <!-- The of-visible utility prevents the root dropdown from scrolling. -->
    <div class="dropdown-items of-visible">
      <div class="dropdown-absolute dropdown-right">
        <!-- The bd-b-none utility and the sharp-b utility remove the trigger's border and border radius of the bottom.  -->
        <button class="btn btn-primary btn-ico-right bd-b-none sharp-b">Juice <i class="ico ico-right"></i></button>
        <div class="dropdown-menu">
          <div class="dropdown-items">
            <div class="btns-y">
              <button class="btn btn-dark">Apple</button>
              <button class="btn btn-dark">Orange</button>
              <button class="btn btn-dark">Banana</button>
            </div>
          </div>
        </div>
      </div>
      <button class="btn btn-primary bd-t-none bd-b-none sharp">Whiskey, please.</button>
      <button class="btn btn-primary bd-t-none sharp-t">No, thanks.</button>
    </div>
  </div>
</div>

Nested Static Dropdowns

Static dropdowns can also be nested, we can use nested static dropdowns to create a menu tree. Let’s see the below example for detail.

<div class="dropdown-static">
  <button class="btn btn-text-dark">Any thing to eat?</button>
  <div class="dropdown-menu">
    <div class="dropdown-items">
      <div class="dropdown-static">
        <button class="btn btn-text-dark btn-ico-right">Fruit <i class="ico ico-down"></i></button>
        <div class="dropdown-menu">
          <div class="dropdown-items">
            <div class="btns-y">
              <button class="btn btn-text-dark">Apple</button>
              <button class="btn btn-text-dark">Orange</button>
              <button class="btn btn-text-dark">Banana</button>
            </div>
          </div>
        </div>
      </div>
      <div class="dropdown-static">
        <button class="btn btn-text-dark btn-ico-right">Meat <i class="ico ico-down"></i></button>
        <div class="dropdown-menu">
          <div class="dropdown-items">
            <div class="btns-y">
              <button class="btn btn-text-dark">Chicken</button>
              <button class="btn btn-text-dark">Pig</button>
              <button class="btn btn-text-dark">Duck</button>
            </div>
          </div>
        </div>
      </div>
      <button class="btn btn-text-dark">No, Thanks.</button>
    </div>
  </div>
</div>

Responsive Dropdown

The .dropdown-fixed class is designed for mobile devices. It helps to show a dropdown menu with a cover on the document viewport. The .dropdown-absolute-m class is designed to combine with the .dropdown-fixed class to create a responsive dropdown.

The combination of these two classes means a fixed dropdown is prefered on small screens, and an absolute dropdown is prefered on middle size screens and large screens. Let’s see the below example for detail.

<div class="dropdown-fixed dropdown-absolute-m">
  <button class="btn btn-primary btn-ico-right">
    I'm responsive <i class="ico ico-down"></i>
  </button>
  <div class="dropdown-menu">
    <div class="dropdown-items">
      <div class="btns-y">
        <button class="btn btn-primary">One</button>
        <button class="btn btn-primary">Two</button>
        <button class="btn btn-primary">Three</button>
      </div>
    </div>
  </div>
</div>

HTML Attributes

data-dropdown-standalone

<div class="dropdown-absolute" data-dropdown-standalone>...</div>

Prevent the dropdown from being toggled unless the click event is triggered on itself or its descendant elements.

data-dropdown-toggle-disabled

<div class="dropdown-items" data-dropdown-toggle-disabled>...</div>

Prevent the dropdown from being toggled when the click event is triggered on a specific element or the specific element’s descendant elements.

data-dropdown-toggle

<div class="dropdown-items" data-dropdown-toggle-disabled>
  <div class="btns-y">
    <button data-dropdown-toggle class="btn btn-primary">Do something</button>
    <button class="btn btn-primary">Close</button>
  </div>
</div>

Recover the ability of toggling the dropdown for a specific element and the element’s descendant elements.

Javascript Methods

luda.dropdown.activate(element)

luda.dropdown.activate(document.querySelector('#my-dropdown'))

Open a dropdown.

luda.dropdown.deactivate(element)

luda.dropdown.deactivate(document.querySelector('#my-dropdown'))

Close a dropdown.

luda.dropdown.toggle(element)

luda.dropdown.toggle(document.querySelector('#my-dropdown'))

Toggle a dropdown.

DOM Events

luda:dropdown:activate

luda.on('luda:dropdown:activate', '#my-dropdown', function(event){
  let $myDropdown = this, $activateDropdown = event.target
  event.preventDefault() // Prevent the dropdown from being activated if necessary.
})

Will be triggered before the .dropdown-active class added to a dropdown.

luda:dropdown:activated

luda.on('luda:dropdown:activated', '#my-dropdown', function(event){
  let $myDropdown = this, $activatedDropdown = event.target
})

Will be triggered after the .dropdown-active class added to a dropdown and CSS transition finished.

luda:dropdown:deactivate

luda.on('luda:dropdown:deactivate', '#my-dropdown', function(event){
  let $myDropdown = this, $deactivateDropdown = event.target
  event.preventDefault() // Prevent the dropdown from being deactivated if necessary.
})

Will be triggered before the .dropdown-active class removed from a dropdown.

luda:dropdown:deactivated

luda.on('luda:dropdown:deactivated', '#my-dropdown', function(event){
  let $myDropdown = this, $deactivatedDropdown = event.target
})

Will be triggered after the .dropdown-active class removed from a dropdown and CSS transition finished.

Sass Variables

Size

$dropdown-width-breakpoint: m !default

Default breakpoint of the .dropdown-absolute-{postfix} class.

$dropdown-static-menu-margin-left-rem: $spacing-small-rem !default

$dropdown-absolute-max-height-rem: baseline(50) !default

$dropdown-absolute-activated-gap-rem: $spacing-tiny-rem !default

Others

$dropdown-absolute-border-radius: $border-radius-main !default

$dropdown-absolute-fixed-background: $background-color-main !default

$dropdown-absolute-box-shadow: $box-shadow-normal !default