@data-slot/toggle

Headless toggle button component for vanilla JavaScript. Accessible, unstyled, tiny.

Installation

npm install @data-slot/toggle

Quick Start

<button data-slot="toggle">Bold</button>
<button data-slot="toggle" data-default-pressed>Italic</button>

<script type="module">
  import { create } from "@data-slot/toggle";

  const controllers = create();
</script>

API

Initialization

create(scope?)

Auto-discover and bind all toggle instances in a scope (defaults to document).

import { create } from "@data-slot/toggle";

const controllers = create(); // Returns ToggleController[]

createToggle(root, options?)

Create a controller for a specific element.

import { createToggle } from "@data-slot/toggle";

const toggle = createToggle(element, {
  defaultPressed: false,
  disabled: false,
  onPressedChange: (pressed) => console.log(pressed),
});

Slots

Runtime Slots

• toggle - The button itself. Toggles its pressed state and exposes aria-pressed and data-state for accessibility and styling; no child slots are needed.

Markup

<button data-slot="toggle">Label</button>

The toggle is a simple single-element component. Always use a native <button> element—keyboard support (Enter/Space) and focus handling are only guaranteed with <button>. Non-button elements (e.g., <div>, <span>) are not recommended and would require manual keyboard handling.

Data Attributes

Options can also be set via data attributes on the root element. JS options take precedence.

| Attribute | Type | Default | Description | |-----------|------|---------|-------------| | data-default-pressed | boolean | false | Initial pressed state | | data-disabled | boolean | false | Disabled state |

<!-- Initially pressed toggle -->
<button data-slot="toggle" data-default-pressed>Bold</button>

Options

| Option | Type | Default | Description | |--------|------|---------|-------------| | defaultPressed | boolean | false | Initial pressed state | | disabled | boolean | false | Disabled state | | onPressedChange | (pressed: boolean) => void | undefined | Callback when state changes |

Controller

| Method/Property | Description | |-----------------|-------------| | toggle() | Toggle the pressed state (ignores disabled) | | press() | Set pressed to true (ignores disabled) | | release() | Set pressed to false (ignores disabled) | | pressed | Current pressed state (readonly boolean) | | destroy() | Cleanup all event listeners |

Note: Controller methods always work, even when disabled. This allows programmatic control regardless of user interaction state. If you need to check disabled state before calling controller methods, check the element's attributes yourself.

Events

Outbound Events

Listen for changes via custom events:

element.addEventListener("toggle:change", (e) => {
  console.log("Pressed:", e.detail.pressed);
});

Inbound Events

Control the toggle via events (ignored when disabled):

| Event | Detail | Description | |-------|--------|-------------| | toggle:set | { value: boolean } | Set pressed state programmatically |

// Set to specific state
element.dispatchEvent(
  new CustomEvent("toggle:set", { detail: { value: true } })
);

Deprecated Shapes

The following shapes are deprecated and will be removed in v1.0:

// Deprecated: boolean detail
element.dispatchEvent(
  new CustomEvent("toggle:set", { detail: true })
);

// Deprecated: { pressed } shape
element.dispatchEvent(
  new CustomEvent("toggle:set", { detail: { pressed: true } })
);

Use { value: boolean } instead.

Styling

State Attributes

The component sets these attributes for styling:

• aria-pressed="true|false" - ARIA state
• data-state="on|off" - CSS styling hook

Basic Styling

/* Unpressed state */
[data-slot="toggle"] {
  background: #e5e7eb;
  border: none;
  padding: 0.5rem 1rem;
  cursor: pointer;
}

/* Pressed state */
[data-slot="toggle"][data-state="on"] {
  background: #3b82f6;
  color: white;
}

/* Or use aria-pressed */
[data-slot="toggle"][aria-pressed="true"] {
  background: #3b82f6;
  color: white;
}

/* Disabled state */
[data-slot="toggle"][aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
}

Tailwind Example

<button
  data-slot="toggle"
  class="px-4 py-2 bg-gray-200 data-[state=on]:bg-blue-500 data-[state=on]:text-white aria-disabled:opacity-50"
>
  Bold
</button>

Keyboard Navigation

The toggle uses a native <button> element, so keyboard support is automatic:

| Key | Action | |-----|--------| | Enter | Toggle state | | Space | Toggle state |

Accessibility

The component automatically handles:

• aria-pressed state on the button
• Native disabled and aria-disabled when disabled (for buttons)
• type="button" to prevent form submission

Behavior

Disabled Behavior

When disabled (via disabled option, data-disabled attribute, native disabled attribute, or aria-disabled="true"):

| Input | Blocked? | |-------|----------| | Click / Enter / Space | Yes | | toggle:set event | Yes | | Controller methods (toggle(), press(), release()) | No |

For <button> elements, the disabled option sets both the native disabled attribute and aria-disabled="true". For other elements, only aria-disabled is set.

License

MIT