Accordion

A vertically stacked set of interactive headings that each reveal an associated section of content.

import { Component } from '@angular/core';
import {
    RdxAccordionContentDirective,
    RdxAccordionHeaderDirective,
    RdxAccordionItemDirective,
    RdxAccordionRootDirective,
    RdxAccordionTriggerDirective
} from '@radix-ng/primitives/accordion';
import { ChevronDown, LucideAngularModule, X } from 'lucide-angular';

@Component({
    selector: 'accordion-demo',
    standalone: true,
    imports: [
        RdxAccordionRootDirective,
        RdxAccordionItemDirective,
        RdxAccordionHeaderDirective,
        RdxAccordionTriggerDirective,
        RdxAccordionContentDirective,
        LucideAngularModule
    ],
    template: `
        <div class="AccordionRoot" [defaultValue]="'item-1'" rdxAccordionRoot>
            <div class="AccordionItem" [value]="'item-1'" rdxAccordionItem>
                <div class="AccordionHeader" rdxAccordionHeader>
                    <button class="AccordionTrigger" type="button" rdxAccordionTrigger>
                        Is it accessible?
                        <lucide-angular class="AccordionChevron" [img]="ChevronDownIcon" size="16" />
                    </button>
                </div>
                <div class="AccordionContent" rdxAccordionContent>
                    <div class="AccordionContentText">Yes. It adheres to the WAI-ARIA design pattern.</div>
                </div>
            </div>

            <div class="AccordionItem" [value]="'item-2'" rdxAccordionItem>
                <div class="AccordionHeader" rdxAccordionHeader>
                    <button class="AccordionTrigger" type="button" rdxAccordionTrigger>
                        Is it unstyled?
                        <lucide-angular class="AccordionChevron" [img]="ChevronDownIcon" size="16" />
                    </button>
                </div>
                <div class="AccordionContent" rdxAccordionContent>
                    <div class="AccordionContentText">
                        Yes. It's unstyled by default, giving you freedom over the look and feel.
                    </div>
                </div>
            </div>

            <div class="AccordionItem" [value]="'item-3'" rdxAccordionItem>
                <div class="AccordionHeader" rdxAccordionHeader>
                    <button class="AccordionTrigger" type="button" rdxAccordionTrigger>
                        Can it be animated?
                        <lucide-angular class="AccordionChevron" [img]="ChevronDownIcon" size="16" />
                    </button>
                </div>
                <div class="AccordionContent" rdxAccordionContent>
                    <div class="AccordionContentText">Yes! You can animate the Accordion with CSS or JavaScript.</div>
                </div>
            </div>
        </div>
    `,
    styleUrl: 'accordion-demo.css'
})
export class AccordionDemoComponent {
    readonly ChevronDownIcon = ChevronDown;
    protected readonly XIcon = X;
}

/* reset */
:host {
    button,
    h3 {
        all: unset;
    }

    display: contents;
}

.AccordionRoot {
    border-radius: 6px;
    background-color: var(--mauve-6);
    box-shadow: 0 2px 10px var(--black-a4);
}

.AccordionRoot[data-orientation='vertical'] {
    width: 300px;
    max-width: 295px;
}

.AccordionRoot[data-orientation='horizontal'] {
    height: 300px;

    display: flex;
    flex-direction: row;
}

.AccordionItem {
    overflow: hidden;
    margin-top: 1px;
}

.AccordionItem[data-orientation='horizontal'] {
    display: flex;
}

.AccordionItem[data-orientation='vertical']:first-child {
    margin-top: 0;
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
}

.AccordionItem[data-orientation='vertical']:last-child {
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
}

.AccordionItem[data-orientation='horizontal']:first-child {
    margin-top: 0;
    border-top-left-radius: 4px;
    border-bottom-left-radius: 4px;
}

.AccordionItem[data-orientation='horizontal']:last-child {
    border-top-right-radius: 4px;
    border-bottom-right-radius: 4px;
}

.AccordionItem:focus-within {
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 2px var(--mauve-12);
}

.AccordionHeader {
    display: flex;
}

.AccordionTrigger {
    font-family: inherit;
    padding: 0 20px;
    height: 45px;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 15px;
    line-height: 1;
    color: var(--violet-11);
    box-shadow: 0 1px 0 var(--mauve-6);
    background-color: white;
    cursor: default;
}

.AccordionTrigger[data-orientation='horizontal'] {
    height: 100%;
    padding: 20px;
    writing-mode: vertical-rl;
}

.AccordionTrigger[data-disabled='true'] {
    color: var(--gray-7);
}

.AccordionTrigger:hover {
    background-color: var(--mauve-2);
}

.AccordionContent {
    display: flex;
    overflow: hidden;
    font-size: 15px;
    color: var(--mauve-11);
    background-color: var(--mauve-2);
}

.AccordionContent[data-orientation='vertical'][data-state='open'] {
    animation: slideDown 300ms cubic-bezier(0.87, 0, 0.13, 1);
}

.AccordionContent[data-orientation='vertical'][data-state='closed'] {
    animation: slideUp 300ms cubic-bezier(0.87, 0, 0.13, 1);
}

.AccordionContent[data-orientation='horizontal'][data-state='open'] {
    animation: slideRight 300ms cubic-bezier(0.87, 0, 0.13, 1);
}

.AccordionContent[data-orientation='horizontal'][data-state='closed'] {
    animation: slideLeft 300ms cubic-bezier(0.87, 0, 0.13, 1);
}

.AccordionContentText {
    padding: 15px 20px;
}

.AccordionChevron {
    display: flex;
    color: var(--violet-10);
    transition: transform 300ms cubic-bezier(0.87, 0, 0.13, 1);
}

.AccordionTrigger[data-state='open'] > .AccordionChevron {
    transform: rotate(180deg);
}

.horizontal-flex-container {
    display: flex;
}

@keyframes slideDown {
    from {
        height: 0;
    }

    to {
        height: var(--radix-accordion-content-height);
    }
}

@keyframes slideUp {
    from {
        height: var(--radix-accordion-content-height);
    }

    to {
        height: 0;
    }
}

@keyframes slideRight {
    from {
        width: 0;
    }

    to {
        width: var(--radix-accordion-content-width);
    }
}

@keyframes slideLeft {
    from {
        width: var(--radix-accordion-content-width);
    }

    to {
        width: 0;
    }
}

Features

Full keyboard navigation.
Supports horizontal/vertical orientation.
Supports Right to Left direction.
Can expand one or multiple items.
Can be controlled or uncontrolled.

API Reference

Root

Prop	Type	Default
`defaultValue`	`[] \| string`	-
`disabled`	`boolean`	-
`orientation`	`RdxAccordionOrientation`	`'vertical'`
`type`	`RdxAccordionType`	`'single'`
`value`	`[] \| string`	-
`onValueChange`	`EventEmitter<void>`	`new EventEmitter<void>()`

Data attribute	Values
`[data-orientation]`	`"vertical" \| "horizontal"`

Item

Contains all the parts of a collapsible section.

Prop	Type	Default
`disabled`	`boolean`	-
`expanded`	`boolean`	-
`value`	`string`	-
`closed`	`EventEmitter<void>`	`new EventEmitter<void>()`
`expandedChange`	`EventEmitter<boolean>`	`new EventEmitter<boolean>()`
`opened`	`EventEmitter<void>`	`new EventEmitter<void>()`

Data attribute	Values
`[data-state]`	`"open" \| "closed"`
`[data-disabled]`	`Present when disabled`
`[data-orientation]`	`"vertical" \| "horizontal"`

Wraps an rdxAccordionTrigger.

Data attribute	Values
`[data-state]`	`"open" \| "closed"`
`[data-disabled]`	`Present when disabled`
`[data-orientation]`	`"vertical" \| "horizontal"`

Trigger

Toggles the collapsed state of its associated item. It should be nested inside an rdxAccordionHeader.

Data attribute	Values
`[data-state]`	`"open" \| "closed"`
`[data-disabled]`	`Present when disabled`
`[data-orientation]`	`"vertical" \| "horizontal"`

Content

Contains the collapsible content for an item.

Data attribute	Values
`[data-state]`	`"open" \| "closed"`
`[data-disabled]`	`Present when disabled`
`[data-orientation]`	`"vertical" \| "horizontal"`

CSS Variable	Description
`--radix-accordion-content-width`	The width of the content when it opens/closes
`--radix-accordion-content-height`	The height of the content when it opens/closes