Popover appears over the main content on the page. It provides helpful information that doesn't need to appear on the page itself. It’s often used for long helper text or contextual instructions that don't need to be visible until users focus on a specific page element.

• The user clicks an element on the page, like a link, button, or form field, which activates Popover.  
• Popover opens next to the clicked element. 
• Popover contains text, like helper text, short instructions, or a link that opens in a new browser tab. 
• The user clicks the Close icon in the upper right corner or presses the Esc key to close Popover.

• To help users complete a task 
• To provide additional information 
• To give users the option to visit another page to learn more

• For additional information that’s longer than 2 short paragraphs 
• For actions or steps in a workflow 

No additional information for this component.

Popover appears to the right of the trigger element by default. It can be set to appear above, below, or to the left instead. On screens less than 640px wide, Popover content appears below the trigger by default or above if it would be outside the viewport.

Case

Use title case for Popover heading text (“Setup Tips”, not “Setup tips”). Use sentence case for body text.

Screen readers

When users click Popover’s trigger element, screen readers read all text that's part of the element, including button, link, and alt text. When Popover is activated, screen readers read the full content.

Alt text

If the trigger element is an icon or doesn’t already contain text, add alt text so screen readers introduce the Popover correctly.

Closing

For users to close Popover by clicking outside it, you need to code an additional hook. Any links inside Popover (e.g., to an article or FAQ) should be set to open in a new tab using target="_blank".

Placement

On screens less than 640px wide, Popover defaults to appear below the trigger element. For screens wider than 640px, the position can be configured using the placement prop.

Keyboard use

When Popover is opened, user focus should be placed on the first focusable element. Popover can be closed using the Esc key or the Close icon in the top right corner. User focus should be placed back on the trigger when Popover is closed.

Implementation links

Popover directory in Bitbucket

Implementation details

It is strongly recommended to familiarize yourself with the Forge source code. While this documentation is a best effort to document the intent and usage of a component, sometimes some features only become clear when looking at the source code. Also, looking at Forge's source code may help identify and fix bugs in either your application or Forge itself.

Storybook files

Forge maintains at least one storybook file per component. While the primary audience for these files is typically the Forge team, these storybook files may cover usages of the component not covered by a demo. The storybook for the latest version of forge can be found at go/forge-storybook.

Testing library

Forge strongly encourages using testing-library to write tests for your application.

"The more your tests resemble the way your software is used, the more confidence they can give you."

If you're having trouble testing a Forge component using testing-library, it would be a good idea to see how Forge tests its own components. For the most part, Forge tries to use screen.getByRole as much as it can, as that API provides the best feedback on a11y compliance. Forge discourages the use of document.querySelector and screen.getByTestId as both APIs encourage using implementation details to test your component, and discourage adding roles to your component.

With that being said, many of Forge's components were not built with accessibility in mind. These components do break the recommendations listed above.

In Nimbus applications

athenaOne serves the Forge bundle independently from your application's bundle. Importing Forge components directly from '@athena/forge' takes advantage of this feature.

import { Popover } from '@athena/forge'

In standalone applications

Importing components using the exact path to the module takes advantage of webpack's tree shaking feature. Webpack will include only that module and its dependencies.

import Popover from '@athena/forge/Popover';

To use this import guidance, Typescript applications must use typescript >= 4.7.3, and should add this setting to their tsconfig.json file:

{
  "compilerOptions": {
    "moduleResolution": "Node16",
  }
}

If this setting doesn't work for your application, use this import statement instead:

import Popover from '@athena/forge/dist/Popover';