@headlessui/react@v2.0.0

We just released Headless UI v2.0 for React which includes a ton of new stuff:

• Built-in anchor positioning — using Floating UI, components like Menu, Listbox, and more can now automatically position their popovers to be anchored to their trigger, adapting as needed to changes in the viewport.
• Headless checkbox component — we've added a headless Checkbox component to complement our existing RadioGroup component, making it easy to build totally custom checkbox controls.
• HTML form components — we've added Input, Select, Textarea, Label, Description, Fieldset, and Legend components that handle all of the ID generation and aria-* attribute mapping you need to do to connect form fields together.
• Improved hover and focus-visible detection — using hooks from the awesome React Aria library under the hood, Headless UI now adds smarter data-hover and data-focus attributes to your controls that behave more consistently across different devices than the native pseudo-classes.
• Combobox list virtualization — the Combobox component can now handle giant lists of options with no performance issues.

Changelog

Added

• Add new Checkbox component (#2887, #2962)
• Add new Button component (#2887)
• Add new Input component (#2887, #2902, #2940)
• Add new Textarea component (#2887, #2902, #2940)
• Add new Select component (#2887, #2902)
• Add new Fieldset and Legend components (#2887)
• Add new Field, Label, Description components (#2887, #2941)
• Add new MenuSection, MenuHeading, and MenuSeparator components (#2887)
• Add new ListboxSelectedOption component (#2887)
• Add new DataInteractive component (#2887)
• Add new CloseButton component and useClose hook (#3096)
• Add new anchor, modal, and portal props to Combobox, Listbox, Menu and Popover components (#2887, #3075, #3097, #3111, #3115, #3121, #3124, #3133, #3138, #3148, #3152, #3154, #3157)
• Add new autoFocus prop to focusable components (#2887)
• Add new virtual prop to Combobox component (#2779, #3128, #3160, #3161, #3163)
• Add new onClose prop to Combobox component (#3122)
• Add new immediate prop to Combobox for immediately opening the Combobox when the input receives focus (#2686)
• Add new --button-width CSS variable on the ListboxOptions, MenuItems, and PopoverPanel components (#2887, #3058)
• Add new --input-width and --button-width CSS variables on the ComboboxOptions component (#3057)
• Add new data-* attributes as an alternative to the existing data-headlessui-state attribute (#2887, #3035, #3061)

Fixed

• Fix scroll-locking on iOS (#2891)
• Fix cancellation of events when using disabled or aria-disabled attributes (#2890)
• Fix unnecessary execution of the displayValue callback in ComboboxInput component (#3048)
• Fix types for multiple prop in Combobox component (#3099)
• Fix focus handling in ComboboxInput component (#3065, #3073)
• Fix enter transitions in Transition component (#3074)
• Fix focus handling in ListboxOptions and MenuItems components (#3112)
• Fix horizontal scrolling inside the Dialog component (#2889)

Changed

• Require React 18 (#2887, #3092, #3131)
• Always render hidden form input fields for Checkbox, Switch and RadioGroup components (#3095)
• Deprecate the RadioGroup.Option component in favor of new Radio component (#2887)
• Deprecate the active prop in favor of new focus prop (#2887)
• Dialog is now focused by default instead of the first focusable element (#2887)
• Change default tags for ListboxOptions, ListboxOption, ComboboxOptions, ComboboxOption, and TabGroup components (#3109)
• Change default tag from div to Fragment on Transition components (#3110, #3147)
• Allow Combobox component to have null value (#3064, #3100)
• Attempt form submission when pressing enter on the ListboxButton component (#2972)
• Deprecate the entered prop on the Transition component (#3089)
• Add frozen value to ComboboxOptions component (#3126)

Upgrading from v1

Update dependencies

Install the latest version of the package via npm:

npm install @headlessui/react@latest

Comboboxes now always support empty values

Previously the Combobox component required an option to always be set, and you could opt out of this behavior using the nullable prop. In v2.0 comboboxes support empty values by default so you can remove this prop:

- <Combobox value={selected} onChange={setSelected} nullable>
+ <Combobox value={selected} onChange={setSelected}>

If you'd like to keep the previous behavior, update your onChange callback to only set the selected value if an option has actually been selected:

 <Combobox
   value={selected}
-  onChange={setSelected}
+  onChange={(newValue) => setSelected((oldValue) => newValue ?? oldValue)}
   onClose={() => setQuery('')}
 >

New default elements

The default rendered element has changed for a number of components in v2.0:

Component	v1.x element	v2.0 element
Transition	div	Fragment
TransitionRoot	div	Fragment
TransitionChild	div	Fragment
ListboxOptions	ul	div
ListboxOption	li	div
ComboboxOptions	ul	div
ComboboxOption	li	div
TabGroup	Fragment	div

If you're relying on a default element that has change, you can preserve that behavior using the as prop:

- <Transition ...>
+ <Transition as="div" ...>

Dialogs no longer require a focusable child

Previously the Dialog component would automatically focus the first focusable child on open. This meant that you had to have at least one focusable element within your dialog, otherwise you would see a warning in your console.

In v2.0 that is no longer the case and the dialog's root element is focused instead on open.

If you'd like a child element to receive focus when your dialog is opened, you can add the autoFocus prop to any Headless UI form control:

 <Dialog>
   <DialogPanel>
-    <Listbox ... />
+    <Listbox autoFocus ... />
   </DialogPanel>
 </Dialog>

For non-Headless UI components, you can add the data-autofocus attribute to any focusable element:

 <Dialog>
   <DialogPanel>
-    <button>...</button>
+    <button data-autofocus>...</button>
   </DialogPanel>
 </Dialog>

Dropdown components are now modal by default

The Menu, Combobox, and Listbox dropdowns are now rendered modal by default. When the dropdown is open the page is scroll-locked and all other page content is made inert.

While this is generally recommended behavior for these components, you can disable this using the modal prop:

- <ComboboxOptions ...>
+ <ComboboxOptions modal={false} ...>

Dialog.Overlay and Dialog.Backdrop components removed

In Headless UI v1.6 we deprecated the Dialog.Overlay and Dialog.Backdrop components. These have now been removed in v2.0.

If you're using either of these components, you can update your app to use the new DialogPanel approach:

  <Dialog>
-    <Dialog.Overlay className="..." />
+    <div className="..." />
+    <DialogPanel>
       {/* ... */}
+    </DialogPanel>
   </Dialog>

Deprecated component dot-notation

The previous component dot-notation has been deprecated in favor of using explicit imports for each individual component. This is to improve compatibility with RSC (React Server Components) and tree-shaking.

We recommend updating to this new API:

- import { Menu } from '@headlessui/react'
+ import { Menu, MenuButton, MenuItems, MenuItem } from '@headlessui/react'

  function Example() {
    return (
      <Menu>
-       <Menu.Button>My account</Menu.Button>
-       <Menu.Items>
-         <Menu.Item><a href="/settings">Settings</a></Menu.Item>
-         <Menu.Item><a href="/support">Support</a></Menu.Item>
-         <Menu.Item><a href="/license">License</a></Menu.Item>
-       </Menu.Items>
+       <MenuButton>My account</MenuButton>
+       <MenuItems>
+         <MenuItem><a href="/settings">Settings</a></MenuItem>
+         <MenuItem><a href="/support">Support</a></MenuItem>
+         <MenuItem><a href="/license">License</a></MenuItem>
+       </MenuItems>
      </Menu>
    )
  }

Deprecated component-specific label and description components

With the addition of the multi-purpose Field, Label and Description components in v2, we've deprecated the component-specific versions.

v1.x component	v2.0 replacement
Combobox.Label	Label
Dialog.Description	Description
Listbox.Label	Label
RadioGroup.Description	Description
RadioGroup.Label	Label
Switch.Description	Description
Switch.Group	Field
Switch.Label	Label

We recommend updating to these new components:

- import { Combobox } from '@headlessui/react'
+ import { Combobox, ComboboxInput, ComboboxOptions, Field, Label } from '@headlessui/react'

  function Example() {
    return (
-     <Combobox>
-       <Combobox.Label>Assignee:</Combobox.Label>
-       <Combobox.Input />
-       <Combobox.Options>{/* ... */}</Combobox.Options>
-     </Combobox>
+     <Field>
+       <Label>Assignee:</Label>
+       <Combobox>
+         <ComboboxInput />
+         <ComboboxOptions>{/* ... */}</ComboboxOptions>
+       </Combobox>
+     <Field>
    )
  }

Deprecated RadioGroup.Option component

We've deprecated the RadioGroup.Option in favor of the more terse Radio component.

We recommend updating to this new component:

  <RadioGroup>
-   <RadioGroup.Option>{*/ ...*/}</RadioGroup.Option>
+   <Radio>{*/ ...*/}</Radio>
  </RadioGroup>

Deprecated active prop in favor of focus

We've deprecated the active prop in favor of the new focus prop on the ComboboxOption, ListboxOption, ListboxOption, MenuItem, MenuItem, RadioOption, and RadioOption components.

We recommend updating to this new prop:

  <MenuItem >
-   {({ active }) => (
+   {({ focus }) => (
      {/* ... */}    
    )}
  </MenuItem>

Deprecated @headlessui/tailwindcss package

With the availability of the new data-* attributes in v2.0, we've deprecated the @headlessui/tailwindcss package.

We recommend updating to use the new data-* attributes instead. Start by removing this package:

npm remove @headlessui/tailwindcss

Next, replace the ui-* class modifiers with data-[*] modifiers:

  <MenuItem
    as="a"
    href="#"
-   className="ui-active:bg-blue-500 ui-active:text-white"
+   className="data-[active]:bg-blue-500 data-[active]:text-white"
  >
    {*/ ...*/}
  </MenuItem>