Collapsible

Installation

Copy editable source into an initialized application:

pnpm dlx @simurgh-ui/cli add collapsible

For package consumption, import from the component subpath and load its optional recipe CSS:

React

import {
  Collapsible,
  CollapsibleTrigger,
  CollapsibleContent,
} from '@simurgh-ui/react/collapsible';
import '@simurgh-ui/styles/collapsible.css';

Vue

import {
  Collapsible,
  CollapsibleTrigger,
  CollapsibleContent,
} from '@simurgh-ui/vue/collapsible';
import '@simurgh-ui/styles/collapsible.css';

Angular

import { CollapsibleComponent } from '@simurgh-ui/angular/collapsible';
import '@simurgh-ui/styles/collapsible.css';

Omit the component stylesheet for fully headless styling. CLI-copied components use the local path written to simurgh.json and the copied application styles instead of these package imports.

Purpose

Collapsible connects a native button to content through aria-expanded and aria-controls.

Default presentation: headless

No default visual treatment is applied. The public component supplies behavior and semantics; consumers provide layout and appearance.

Basic usage

Live component Collapsible ◆

Project details

Three framework-native implementations.

Anatomy

The public component parts are listed in API surface below. Use only the parts needed by the example; compound components depend on their documented parent/child nesting.

State model

Controlled state remains the application’s source of truth and must be updated from every change event. Uncontrolled state reads its default only when the component mounts. Do not pass both forms of the same state at once.

Framework	Exact state contract and reset behavior
React	Controlled: open + onOpenChange. Uncontrolled: defaultOpen. Reset controlled state by assigning the initial value; reset uncontrolled state by changing a React key.
Vue	Controlled: v-model (modelValue + update:modelValue). No uncontrolled prop is exposed. Reset the model ref to its initial value; reset uncontrolled state with a changed Vue :key.
Angular	Controlled two-way binding: [(open)] (open + openChange). Angular exposes no separate default input; initialize and reset the bound class field explicitly.

React

const initialOpen = false;
const [open, setOpen] = useState(initialOpen);
const [resetKey, setResetKey] = useState(0);

<Collapsible open={open} onOpenChange={setOpen}>…</Collapsible>
<button onClick={() => setOpen(initialOpen)}>Reset controlled</button>
<Collapsible key={resetKey} defaultOpen={initialOpen}>…</Collapsible>
<button onClick={() => setResetKey((key) => key + 1)}>Reset uncontrolled</button>

Vue

<script setup lang="ts">
import { ref } from 'vue';
const initial = '';
const state = ref(initial);
const resetKey = ref(0);
</script>

<Collapsible v-model="state">…</Collapsible>
<button @click="state = initial">Reset controlled</button>

Angular

initial = false;
open = this.initial;
reset() { this.open = this.initial; }

<simurgh-collapsible [(open)]="open">…</simurgh-collapsible>
<button type="button" (click)="reset()">Reset</button>

Use Accordion when multiple related sections form a coordinated set. Use Collapsible for one independent disclosure.

Examples

React

<Collapsible>
  <CollapsibleTrigger>Details</CollapsibleTrigger>
  <CollapsibleContent>Content</CollapsibleContent>
</Collapsible>

Vue

<Collapsible>
  <CollapsibleTrigger>Details</CollapsibleTrigger>
  <CollapsibleContent>Content</CollapsibleContent>
</Collapsible>

Angular

<simurgh-collapsible>
  <span trigger>Details</span>
  <div>Content</div>
</simurgh-collapsible>

Keyboard interactions

These keys describe behavior implemented by the adapters. Native Tab, Enter, and Space behavior still applies to descendant links, buttons, and form controls unless the component overrides it.

Concern / keys	Behavior
Focus entry and exit (Tab / Shift+Tab)	Tab focuses the trigger; subsequent Tab follows visible content order.
Navigation and activation	Enter or Space toggles the trigger.
Escape	Not handled by the component.
RTL differences	No RTL-specific key mapping.
Typeahead	Not supported.

Accessibility

Preserve the documented composition and accessible names when wrapping or restyling this component. See accessibility and RTL guidance for keyboard, focus, labeling, and directionality requirements.

API surface

• React exports: Collapsible, CollapsibleTrigger, CollapsibleContent
• Vue exports: Collapsible, CollapsibleTrigger, CollapsibleContent
• Angular exports: CollapsibleComponent

Import these public symbols from the component subpath shown in Installation. Framework-specific props, events, slots, directives, methods, defaults, and native-attribute behavior belong in the API tables on this page; use the linked source only to verify the current implementation.

React API reference

React

An inherited-attributes entry means the component accepts the complete named React native interface, including its event handlers and ARIA and data attributes. Remaining attributes are forwarded to the rendered element unless the component behavior described on this page overrides them.

Collapsible

Complete props type: PropsWithChildren<{ open?: boolean; defaultOpen?: boolean; onOpenChange?(open: boolean): void; }>.

Prop	Type	Default / requirement
children	ReactNode	undefined
defaultOpen	boolean	undefined
onOpenChange	(open: boolean) => void	undefined
open	boolean	undefined

CollapsibleTrigger

Inherited attributes: ButtonHTMLAttributes<HTMLButtonElement>.

Prop	Type	Default / requirement
children	ReactNode	undefined

CollapsibleContent

Inherited attributes: HTMLAttributes<HTMLDivElement>.

Prop	Type	Default / requirement
children	ReactNode	undefined

Vue API reference

Vue

Boolean props without explicit defaults use Vue’s false default. Undeclared attributes follow the fallthrough behavior stated for each component.

Collapsible

Vue attribute fallthrough is enabled for the rendered root.

Prop	Type	Default / requirement
modelValue	boolean	undefined
defaultOpen	boolean	false

Event	Payload
update:modelValue	boolean

Slots: default.

Exposed methods: none.

CollapsibleTrigger

Vue attribute fallthrough is enabled for the rendered root.

Prop	Type	Default / requirement
disabled	boolean	false

No emitted events.

Slots: default.

Exposed methods: none.

CollapsibleContent

Vue attribute fallthrough is enabled for the rendered root.

No declared props.

No emitted events.

Slots: default.

Exposed methods: none.

Angular API reference

Angular

Inputs and outputs use their public template names. Public methods are callable through a template reference or ViewChild. Native attributes apply to the documented template root or directive host; they are not automatically forwarded through component hosts.

CollapsibleComponent

Component selector: simurgh-collapsible. The template’s first native element is button.

Input	Type	Default / requirement
open	boolean	false
disabled	boolean	false

Output	Payload
openChange	boolean

Content projection: [trigger], default.

Public method
toggle(): void

Composition contract

Follow the framework example as a structural contract. Root components own shared state; parts that consume that state must stay under the root (or be attached to projected descendants in Angular). Parts described as conditional are optional until their corresponding interaction or semantic region is used. Do not render a state-consuming part by itself.

Framework	Required parent/child relationship	Conditional parts	Supporting types
React	Render Collapsible as the ancestor. Nest the listed parts inside that root so they can read its shared state/context.	CollapsibleTrigger, CollapsibleContent are conditional parts: include only those needed by the documented anatomy. A trigger/control and its matching content/item are required when that interaction is used.	None.
Vue	Render Collapsible as the ancestor. Nest the listed parts inside that root so they can read its shared state/context.	CollapsibleTrigger, CollapsibleContent are conditional parts: include only those needed by the documented anatomy. A trigger/control and its matching content/item are required when that interaction is used.	None.
Angular	Create CollapsibleComponent first and project descendants into its named regions.	[trigger], default are projection regions; default is the main body and named selectors such as [trigger] are required only for that interaction.	None.

Accessible names, descriptions, and form labels remain required whenever the component’s purpose cannot otherwise be determined, even when the corresponding visual part is optional.

Framework parity and differences

The adapters target the same user-visible behavior and accessibility contract. Their public shapes follow each framework’s conventions and are not expected to be symbol-for-symbol identical.

Concern	Contract
Public composition	React exports 3 parts, Vue 3, and Angular 1. These are intentional composition differences; use each framework’s example rather than translating symbol-for-symbol.
State and change events	React uses controlled/default props and callbacks for open; Vue uses v-model; Angular uses [(open)].
Children and content	React uses children; Vue uses the slots listed above; Angular uses the documented content projection selectors.
Native attributes	React forwards the named native interface; Vue follows the stated fallthrough rule; Angular attributes apply to the component host unless an input, directive, or documented native root consumes them.
Imperative access	React has no forwarded ref; Vue exposes no methods; Angular exposes the listed class methods through a template reference or ViewChild.

These differences are intentional adapter design. Behavioral or accessibility differences not stated on this page are parity defects rather than supported variations.

Form integration

This component is not a form control and does not contribute a named value to FormData. Use it to structure or describe a form only when its purpose and accessibility guidance apply.

Supported states

The table distinguishes component behavior from application-owned presentation. “Not supported” means there is no public state contract for that adapter; do not invent one with an undocumented attribute. Keep status and error messages accessible when they are rendered outside the component.

State	React	Vue	Angular
Loading	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.
Empty	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.
Invalid	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.
Read-only	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.
Disabled	Supported with disabled={true} on the documented control or interactive part; its interaction is blocked. Disabled form controls are omitted from submission.	Supported with :disabled="true" on the documented control or interactive part; its interaction is blocked. Disabled form controls are omitted from submission.	Supported with [disabled]="true" on the documented control or interactive part; its interaction is blocked. Disabled form controls are omitted from submission.
Error	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.	Not supported by this component API; handle this state in surrounding application UI.

Styling contract

Styling contract

The selectors below are used by the published component recipe or emitted consistently by an adapter. Treat these as the supported styling surface. Element order, anonymous wrappers, and undocumented descendants are implementation details and should not be targeted.

Surface	Stable hooks
Recipe classes	No component-specific recipe class; this stylesheet currently imports shared tokens only.
Stable DOM parts	No named data-slot parts are emitted; target the forwarded root class or attributes documented in the API.
Stable data attributes	[data-state]
ARIA/state selectors used by the recipe	No ARIA state selector is used by this recipe.
CSS custom properties consumed	No component-specific token consumption beyond the shared token import.

Prefer a semantic token override for theme-wide changes. Use the listed class or part selectors for a component-scoped override. When omitting recipe CSS, preserve state attributes and ARIA semantics even if your replacement styles use different selectors.

Customization

Load the optional component stylesheet for the default recipe, override semantic tokens for broad theme changes, or omit the recipe CSS for headless styling. See theming and styling hooks for import order, selectors, dark mode, RTL, and reduced-motion guidance.

Last verified on 2026-08-13 against Simurgh registry 0.1.1.

Related components

• Review the shared accessibility and RTL guidance and theming and styling hooks.
• Use the component chooser and component overview to compare related primitives.
• Inspect the registry manifest and framework source for React, Vue, or Angular.