Tabs

Tabs allow users to move between different views within the same context at the same level of hierarchy, e.g., UI vs. CLI, macOS vs. Windows vs. Linux, etc.

Usage

When to use

• To move between different views within the same context.

When not to use

• For navigation, consider SideNav, Standalone Links, or Breadcrumb.
• As a stepper or progress bar for multi-step workflows, consider a stepper, using the Stepper Indicator.
• To see multiple content areas at the same time or to fully collapse the content area, use Accordion.

Tab best practices

Spacing

Contained

When the content area consists of a contained component (e.g., table, card, etc), we recommend:

• 24px above tabs
• 0px between the tabs and the content area
• Top & right border-radius of the content area be set to 0
• The content area should be flush on the left & right with the tabs

Nested

When nesting tabs, regardless of if your content area consists of contained or non-contained components; we recommend:

• 24px above each Tabs instance
• 16px between each Tabs instance and its corresponding content area
• Top & right border-radius of the content area be set to 0, if contained
• Each content area should be left indented by 16px

Not contained

When the content area does not consist of a contained component (ie. text block, form, etc), we recommend:

• 24px above Tabs
• 16px between the Tabs and the content area
• The content area should be flush on the left & right with the Tabs, if only one level of tabs. If nested levels, see "Nested".

Overflow

Tabs will fill 100% of the parent container, unless explicitly set to something else. When there are too many tabs to fit within the TabList, a horizontal scrollbar will help the user navigation hidden tabs.

Content

Tabs should be short and concise, and a good indication of what content the user can expect to find within the TabPanel. They should not consist of full sentences.

How to use this component

<Hds::Tabs as |T|>
  <T.Tab>One</T.Tab>
  <T.Tab>Two</T.Tab>
  <T.Tab>Three</T.Tab>

  <T.Panel>Content 1</T.Panel>
  <T.Panel>Content 2</T.Panel>
  <T.Panel>Content 3</T.Panel>
</Hds::Tabs>

Pre-selecting a tab

While the first tab is selected by default, it is possible to customize the starting tab to display on page load in two different ways (depending on how the tabs' state is controlled/persisted).

Using @isSelected argument applied to one of the Tab elements

Declare which tab is selected when the component is first rendered by providing @isSelected argument to one of the Tab elements. From that moment on, the tab selection is controlled internally by the component.

<Hds::Tabs as |T|>
  <T.Tab>One</T.Tab>
  <T.Tab>Two</T.Tab>
  <T.Tab @isSelected={{true}}>Three</T.Tab>

  <T.Panel>Content 1</T.Panel>
  <T.Panel>Content 2</T.Panel>
  <T.Panel>Content 3, I am displayed on page load.</T.Panel>
</Hds::Tabs>

Using @selectedTabIndex argument applied to the Tabs component

If you want to control the internal "selected tab" state of the component, and possibly persist it in a query parameter, you need to provide a @selectedTabIndex argument to the main Tabs component. You also need to handle the change of state using the @onClickTab callback function, invoked whenever a user clicks/selects one of the tabs.

<Hds::Tabs @selectedTabIndex={{this.demoSelectedTab}} @onClickTab={{this.demoUpdateSelectedTabQueryParam}} as |T|>
  <T.Tab>One</T.Tab>
  <T.Tab>Two</T.Tab>
  <T.Tab >Three</T.Tab>

  <T.Panel>Content 1</T.Panel>
  <T.Panel>Content 2</T.Panel>
  <T.Panel>Content 3</T.Panel>
</Hds::Tabs>

Count and icon

<Hds::Tabs as |T|>
  <T.Tab @count="5">One</T.Tab>
  <T.Tab @icon="download">Two</T.Tab>
  <T.Tab>Three</T.Tab>

  <T.Panel>Content 1</T.Panel>
  <T.Panel>Content 2</T.Panel>
  <T.Panel>Content 3!</T.Panel>
</Hds::Tabs>

Call a function on tab click

Use the @onClickTab handler to pass in a custom function. For example, to store the active tab in the URL for persistence.

<Hds::Tabs @onClickTab={{this.logClickedTab}} as |T|>
  <T.Tab>One</T.Tab>
  <T.Tab>Two</T.Tab>
  <T.Tab>Three</T.Tab>

  <T.Panel>Content one</T.Panel>
  <T.Panel>Content two</T.Panel>
  <T.Panel>Content three</T.Panel>
</Hds::Tabs>

Nested tabs

We don’t recommend nesting tabs, but in case it’s necessary to implement such a feature a special code implementation needs to be used: the T.Panel needs to be exposed and its P.isVisible property needs to be provided to the nested tab using the @isParentVisible argument, so that when the parent visibility changes the nested tab can be initialized accordingly.

  <Hds::Tabs as |T|>
    <T.Tab>🐤 Birds</T.Tab>
    <T.Tab>🐠 Fishes</T.Tab>
    <T.Tab>🐙 Cephalopods</T.Tab>
    <T.Panel as |P|>
      <Hds::Tabs @isParentVisible={{P.isVisible}} as |NT|>
        <NT.Tab>🦜 Parrots</NT.Tab>
        <NT.Tab>🦅 Eagles</NT.Tab>
        <NT.Tab>🦉 Owls</NT.Tab>
        <NT.Panel><Doc::Placeholder @text="🦜 Content for Parrots" @height="50" /></NT.Panel>
        <NT.Panel><Doc::Placeholder @text="🦅 Content for Eagles" @height="50" /></NT.Panel>
        <NT.Panel><Doc::Placeholder @text="🦉 Content for Owls" @height="50" /></NT.Panel>
      </Hds::Tabs>
    </T.Panel>
    <T.Panel as |P|>
      <Hds::Tabs @isParentVisible={{P.isVisible}} as |NT|>
        <NT.Tab>🐬 Dolphins</NT.Tab>
        <NT.Tab>🦈 Sharks</NT.Tab>
        <NT.Panel><Doc::Placeholder @text="🐬 Content for Dolphins" @height="50" /></NT.Panel>
        <NT.Panel><Doc::Placeholder @text="🦈 Content for Sharks" @height="50" /></NT.Panel>
      </Hds::Tabs>
    </T.Panel>
    <T.Panel><Doc::Placeholder @text="🐙 Content for Cephalopods" @height="50" /></T.Panel>
  </Hds::Tabs>

Component API

The Tabs component is composed of different parts, with their own APIs:

• Tabs container
• Tab child components
• Panel child components corresponding to each Tab

Tabs API

Tabs::Tab API

Tabs::Panel API

Anatomy

States

Conformance rating

Animation

No indicator animation will be present for users that have enabled prefers-reduced-motion.

Keyboard navigation

Focus on a tab

Activate tab to display matching content area

Move between tabs

Move to interactive element within the content area

Applicable WCAG Success Criteria

Support

If any accessibility issues have been found within this component, let us know by submitting an issue.