Dropdown

Dropdowns contain and give access to a list of buttons or other elements hidden by default. They are commonly used for menus in web applications.

Examples

A dropdown must be associated with an activator, commonly a button, which, at the time of being clicked, expands the dropdown. Activator and dropdown should be contained in a div with a chi-dropdown class, or otherwise, the activator must reference the dropdown with a data-target attribute. Use the chi-dropdown__trigger class on your activator button to make the chevron appear.

Base

Trigger and dropdown enclosed in the same div.

Web Component
HTML Blueprint

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<div class="chi-dropdown">
  <button id="dropdown-1" class="chi-button chi-dropdown__trigger">Dropdown component</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>

<script>chi.dropdown(document.getElementById('dropdown-1'));</script>

Data-target

Dropdown referenced by a data-target attribute in the activator.

There is no need for proximity between elements.

Web Component
HTML Blueprint

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<button id="dropdown-2" class="chi-button chi-dropdown__trigger" data-target="#dropdown-2-menu">Dropdown component</button>
<p class="-text">There is no need for proximity between elements.</p>
<div class="chi-dropdown__menu" id="dropdown-2-menu">
  <a class="chi-dropdown__menu-item" href="#">Item 1</a>
  <a class="chi-dropdown__menu-item" href="#">Item 2</a>
  <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  <a class="chi-dropdown__menu-item" href="#">Item 4</a>
</div>

<script>chi.dropdown(document.getElementById('dropdown-2'));</script>

Hover

Dropdown on hover is only supported when trigger and dropdown elements are enclosed in the same div. Use the chi-dropdown__hover class to achieve this.

Web Component
HTML Blueprint

<div class="chi-dropdown chi-dropdown__hover">
  <button class="chi-button chi-dropdown__trigger">Dropdown component</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>

Animate

Triggers can be animated by applying the -animate class.

Web Component
HTML Blueprint

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<div class="chi-dropdown">
  <button id="dropdown-animate" class="chi-button chi-dropdown__trigger -animate">Animated dropdown trigger</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>

<script>chi.dropdown(document.getElementById('dropdown-animate'));</script>

Positioning

Dropdown is prepared to work with positioning libraries like Popper.js. That is why we support the data-position attribute. Chevron orientation will change depending on its value. Valid values are default, initial, top, right, bottom, left, top-start, top-end, right-start, right-end, bottom-start, bottom-end, left-start, left-end.

Click buttons to see Dropdown positions

Web Component
HTML Blueprint

This HTML Blueprint requires JavaScript. You may use your own solution, or use Chi's vanilla JavaScript solution, Chi.js.

<!-- Top start -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-top-start" data-position="top-start">Top start</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Top -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-top" data-position="top">Top</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Top end -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-top-end" data-position="top-end">Top end</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Left start -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-left-start" data-position="left-start">Left start</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Left -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-left" data-position="left">Left</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Left end -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-left-end" data-position="left-end">Left end</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Right start -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-right-start" data-position="right-start">Right start</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Right -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-right" data-position="right">Right</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Right end -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-right-end" data-position="right-end">Right end</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Bottom start -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-bottom-start" data-position="bottom-start">Bottom start</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Bottom -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-bottom" data-position="bottom">Bottom</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>
<!-- Bottom end -->
<div class="chi-dropdown">
  <button class="chi-button chi-dropdown__trigger" id="dropdown-bottom-end" data-position="bottom-end">Bottom end</button>
  <div class="chi-dropdown__menu">
    <a class="chi-dropdown__menu-item" href="#">Item 1</a>
    <a class="chi-dropdown__menu-item" href="#">Item 2</a>
    <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  </div>
</div>

<!-- JavaScript -->
<script>chi.dropdown(document.querySelectorAll('.chi-dropdown .chi-dropdown__trigger'));</script>

<div class="chi-dropdown__menu">
  <a class="chi-dropdown__menu-item" href="#">Item</a>
  <a class="chi-dropdown__menu-item -active" href="#">Active item</a>
  <a class="chi-dropdown__menu-item -disabled" href="#">Disabled item</a>
  <a class="chi-dropdown__menu-item -hover" href="#">Hovered item</a>
</div>

<div class="chi-dropdown__menu -list">
  <a class="chi-dropdown__menu-item" href="#">
    <span class="chi-dropdown__menu-item_title">Item</span>
    <span class="chi-dropdown__menu-item_text">Item description</span>
  </a>
  <a class="chi-dropdown__menu-item -active" href="#">
    <span class="chi-dropdown__menu-item_title">Active item</span>
    <span class="chi-dropdown__menu-item_text">Item description</span>
  </a>
  <a class="chi-dropdown__menu-item -disabled" href="#">
    <span class="chi-dropdown__menu-item_title">Disabled item</span>
    <span class="chi-dropdown__menu-item_text">Item description</span>
  </a>
  <a class="chi-dropdown__menu-item -hover" href="#">
    <span class="chi-dropdown__menu-item_title">Hovered item</span>
    <span class="chi-dropdown__menu-item_text">Item description</span>
  </a>
</div>

Divider

Several menu items can be arranged together by using a divider. Use the chi-divider component.

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <a class="chi-dropdown__menu-item" href="#">Item 1</a>
  <a class="chi-dropdown__menu-item" href="#">Item 2</a>
  <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  <div class="chi-divider"></div>
  <a class="chi-dropdown__menu-item" href="#">Item 4</a>
</div>

Icons

Dropdown component has been developed to support Chi icons in the menu items.

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <a class="chi-dropdown__menu-item" href="#">
    <i class="chi-icon icon-file-outline" aria-hidden="true"></i>New
  </a>
  <a class="chi-dropdown__menu-item -disabled" href="#">
    <i class="chi-icon icon-arrow-to-bottom" aria-hidden="true"></i>Save
  </a>
  <div class="chi-divider"></div>
  <a class="chi-dropdown__menu-item" href="#">
    <i class="chi-icon icon-mail" aria-hidden="true"></i>Send
  </a>
  <a class="chi-dropdown__menu-item -active" href="#">
    <i class="chi-icon icon-cart" aria-hidden="true"></i>Buy
  </a>
  <a class="chi-dropdown__menu-item" href="#">
    <i class="chi-icon icon-users" aria-hidden="true"></i>Share
  </a>
  <div class="chi-divider"></div>
  <a class="chi-dropdown__menu-item" href="#">
    <i class="chi-icon icon-logout" aria-hidden="true"></i>Logout
  </a>
</div>

Search box

This search box is a special kind of text input prepared to be located on top of the menu-item. It has slightly smaller padding at the sides.

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <div class="chi-input__wrapper -icon--left chi-dropdown__menu-item" role="search">
    <input class="chi-input" type="text" placeholder="Search" aria-label="Search">
    <i class="chi-icon icon-search" aria-hidden="true"></i>
  </div>
  <a class="chi-dropdown__menu-item" href="#">Item 1</a>
  <a class="chi-dropdown__menu-item" href="#">Item 2</a>
  <a class="chi-dropdown__menu-item" href="#">Item 3</a>
  <a class="chi-dropdown__menu-item" href="#">Item 4</a>
</div>

Checkboxes

Base

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox1">
      <label class="chi-checkbox__label" for="checkbox1">Item 1</label>
    </div>
  </div>
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox2" disabled>
      <label class="chi-checkbox__label" for="checkbox2">Item 2</label>
    </div>
  </div>
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox3" checked>
      <label class="chi-checkbox__label" for="checkbox3">Item 3</label>
    </div>
  </div>
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox4">
      <label class="chi-checkbox__label" for="checkbox4">Item 4</label>
    </div>
  </div>
</div>

With Icons

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox1">
      <label class="chi-checkbox__label" for="checkbox1">
        <i class="chi-icon icon-logo-centurylink" aria-hidden="true"></i>
        Item 1
      </label>
    </div>
  </div>
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox2" disabled>
      <label class="chi-checkbox__label" for="checkbox2">
        <i class="chi-icon icon-logo-centurylink" aria-hidden="true"></i>
        Item 2
      </label>
    </div>
  </div>
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox3" checked>
      <label class="chi-checkbox__label" for="checkbox3">
        <i class="chi-icon icon-logo-centurylink" aria-hidden="true"></i>
        Item 3
      </label>
    </div>
  </div>
  <div class="chi-dropdown__menu-item">
    <div class="chi-checkbox">
      <input class="chi-checkbox__input" type="checkbox" id="checkbox4">
      <label class="chi-checkbox__label" for="checkbox4">
        <i class="chi-icon icon-logo-centurylink" aria-hidden="true"></i>
        Item 4
      </label>
    </div>
  </div>
</div>

Radio Buttons

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <fieldset>
    <legend class="chi-dropdown__menu-item">Select an option</legend>
    <div class="chi-dropdown__menu-item">
      <div class="chi-radio">
        <input class="chi-radio__input" type="radio" name="radios" id="radio1">
        <label class="chi-radio__label" for="radio1">Radio Button 1</label>
      </div>
    </div>
    <div class="chi-dropdown__menu-item">
      <div class="chi-radio">
        <input class="chi-radio__input" type="radio" name="radios" id="radio2" disabled>
        <label class="chi-radio__label" for="radio2">Disabled Radio Button 2</label>
      </div>
    </div>
    <div class="chi-dropdown__menu-item">
      <div class="chi-radio">
        <input class="chi-radio__input" type="radio" name="radios" id="radio3">
        <label class="chi-radio__label" for="radio3">Radio Button 3</label>
      </div>
    </div>
    <div class="chi-dropdown__menu-item">
      <div class="chi-radio">
        <input class="chi-radio__input" type="radio" name="radios" id="radio4">
        <label class="chi-radio__label" for="radio4">Radio Button 4</label>
      </div>
    </div>
  </fieldset>
</div>

Range Input

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <div class="chi-dropdown__menu-item">
    <span class="-text -mr--2">200GB</span>
    <input class="chi-input" type="range" aria-label="Range description">
    <span class="-text -ml--2">5TB</span>
  </div>
  <div class="chi-divider"></div>
  <legend class="chi-dropdown__menu-item">Select range</legend>
  <div class="chi-dropdown__menu-item">
    <input class="chi-input" type="range" aria-label="Range description">
  </div>
</div>

Toggle Switch

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <fieldset>
    <legend class="chi-dropdown__menu-item">Configure options</legend>
    <div class="chi-dropdown__menu-item">
      <div class="chi-form__item">
        <label class="chi-switch -xs" for="toggle-mail">
          <input type="checkbox" class="chi-switch__input" id="toggle-mail">
          <span class="chi-switch__content">
            <span class="chi-switch__thumb"></span>
          </span>
          <span class="chi-switch__label">Email notifications</span>
        </label>
      </div>
    </div>
    <div class="chi-dropdown__menu-item">
      <div class="chi-form__item">
        <label class="chi-switch -xs" for="toggle-tlf">
          <input type="checkbox" class="chi-switch__input" id="toggle-tlf">
          <span class="chi-switch__content">
            <span class="chi-switch__thumb"></span>
          </span>
          <span class="chi-switch__label">Phone notifications</span>
        </label>
      </div>
    </div>
    <div class="chi-dropdown__menu-item">
      <div class="chi-form__item">
        <label class="chi-switch -xs" for="toggle-app">
          <input type="checkbox" class="chi-switch__input" id="toggle-mail">
          <span class="chi-switch__content">
            <span class="chi-switch__thumb"></span>
          </span>
          <span class="chi-switch__label">Email notifications</span>
        </label>
      </div>
    </div>
  </fieldset>
</div>

Plain Text

Use a span tag to include text without rendering as a link.

Web Component
HTML Blueprint

<div class="chi-dropdown__menu">
  <span class="chi-dropdown__menu-item">Text 1</span>
  <span class="chi-dropdown__menu-item">Text 2</span>
  <span class="chi-dropdown__menu-item">Text 3</span>
  <span class="chi-dropdown__menu-item">Text 4</span>
</div>

Helpers

Truncate long menu-items

Wrap the menu-item content in a div with the class -flex--ellipsis to truncate long strings.

Web Component
HTML Blueprint

<div class="chi-dropdown__menu" style="width:10rem">
  <a class="chi-dropdown__menu-item" href="#">Item 1</a>
  <a class="chi-dropdown__menu-item" href="#">Item 2</a>
  <a class="chi-dropdown__menu-item" href="#">
    <div class="-flex--ellipsis">Item 3 with truncated longer text</div>
  </a>
  <a class="chi-dropdown__menu-item" href="#">Item 4</a>
</div>

Flexible height

Add the class -h--auto to set menu item height to auto.

Web Component
HTML Blueprint

<div class="chi-dropdown__menu" style="width:10rem">
  <a class="chi-dropdown__menu-item" href="#">Item 1</a>
  <div class="chi-dropdown__menu-item -h--auto -py--1">Lorem ipsum dolor sit amet, consectetur adipisicing elit.</div>
  <a class="chi-dropdown__menu-item" href="#">Item 2</a>
</div>

JavaScript

Properties

Methods

Method	Description	Returns
`hide() => void`	Hides the dropdown	Type: void
`show() => void`	Shows the dropdown	Type: void
`toggle() => void`	Toggles active state (show/hide)	Type: void

Events

Event	Description
`chiDropdownShow`	Dropdown show has been triggered.
`chiDropdownHide`	Dropdown hide has been triggered.

Preventing memory leaks

Dropdown components have a dispose function to free all resources attached to the element, such as event listeners and object data. You must call this method when you want to remove the component.

var elem = document.getElementById('dropdown-3');
var dropdown = chi.dropdown(elem);
// do stuff
dropdown.dispose();

It is safe to call the dropdown method more than once, as it will return any previously created dropdown component associated with the trigger.

var elem = document.getElementById('dropdown-4');
var dropdown = chi.dropdown(elem);
var elem2 = document.getElementById('dropdown-4');
var dropdown2 = chi.dropdown(elem2);
dropdown === dropdown2; // returns true

dropdown.dispose(); // Only have to do it once.

Accessibility

Accessibility guidelines coming soon

Dropdown

Examples

Base

Data-target

Hover

Animate

Positioning

Menu

Menu item states

Description

Divider

Icons

Search box

Checkboxes

Base

With Icons

Radio Buttons

Range Input

Toggle Switch

Plain Text

Helpers

Truncate long menu-items

Flexible height

JavaScript

Properties

Methods

Events

Preventing memory leaks

Accessibility