Accordion

Accordion groups a collection of contents in tabs.

Accordion is defined using AccordionPanel, AccordionHeader and AccordionContent components. Each AccordionPanel must contain a unique value property to specify the active item.

Header I

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Header II

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Header III

Usage #

Examples #

Basic #

Accordion is defined using AccordionPanel, AccordionHeader and AccordionContent components. Each AccordionPanel must contain a unique value property to specify the active item.

Header I

Header II

Header III

Dynamic #

AccordionPanel can be generated dynamically using the standard @for block.

Title 1

Content 1

Title 2

Content 2

Title 3

Content 3

Multiple #

Only one tab at a time can be active by default, enabling multiple property changes this behavior to allow multiple tabs. In this case activeIndex needs to be an array.

Header I

Header II

Header III

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Disabled #

Enabling disabled property of an AccordionTab prevents user interaction.

Header I

Header II

Header III

Header IV

Controlled #

Panels can be controlled programmatically using value property as a model.

Header I

Header II

Header III

Template #

Accordion is customized with toggleicon template.

Amy Elsner

Onyama Limba

Ioni Bowcher

Accessibility #

Screen Reader

Accordion header elements have a button role and use aria-controls to define the id of the content section along with aria-expanded for the visibility state. The value to read a header element defaults to the value of the header property and can be customized by defining an aria-label or aria-labelledby property. Each header has a heading role, for which the level is customized by headerAriaLevel and has a default level of 2 as per W3C specifications.

Disabled accordions headers use aria-disabled and are excluded from the keybord navigation.

The content uses region role, defines an id that matches the aria-controls of the header and aria-labelledby referring to the id of the header.

Header Keyboard Support

Key	Function
tab	Moves focus to the next the focusable element in the page tab sequence.
shift + tab	Moves focus to the previous the focusable element in the page tab sequence.
enter	Toggles the visibility of the content.
space	Toggles the visibility of the content.
down arrow	Moves focus to the next header.
up arrow	Moves focus to the previous header.
home	Moves focus to the first header.
end	Moves focus to the last header.

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