GitHub repository

Combobox (Autocomplete)

Comboboxes are the foundation of accessible autocompletes and command palettes for your app, complete with robust support for keyboard navigation.

To get started, install Headless UI via npm:

npm install @headlessui/react

Comboboxes are built using the Combobox, Combobox.Input, Combobox.Button, Combobox.Options, Combobox.Option and Combobox.Label components.

The Combobox.Input will automatically open/close the Combobox.Options when searching.

You are completely in charge of how you filter the results, whether it be with a fuzzy search library client-side or by making server-side requests to an API. In this example we will keep the logic simple for demo purposes.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  'Durward Reynolds',
  'Kenton Towne',
  'Therese Wunsch',
  'Benedict Kessler',
  'Katelyn Rohan',
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input onChange={(event) => setQuery(event.target.value)} />
      <Combobox.Options>
        {filteredPeople.map((person) => (
          <Combobox.Option key={person} value={person}>
            {person}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

Headless UI keeps track of a lot of state about each component, like which listbox option is currently selected, whether a popover is open or closed, or which item in a menu is currently active via the keyboard.

But because the components are headless and completely unstyled out of the box, you can't see this information in your UI until you provide the styles you want for each state yourself.

Each component exposes information about its current state via render props that you can use to conditionally apply different styles or render different content.

For example, the Combobox.Option component exposes an active state, which tells you if the option is currently focused via the mouse or keyboard, and a selected state, which tells you if that option matches the current value of the Combobox.

import { useState, Fragment } from 'react'
import { Combobox } from '@headlessui/react'
import { CheckIcon } from '@heroicons/react/20/solid'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />
      <Combobox.Options>
        {filteredPeople.map((person) => (
          /* Use the `active` state to conditionally style the active option. */
          /* Use the `selected` state to conditionally style the selected option. */
          <Combobox.Option key={person.id} value={person} as={Fragment}>

            {({ active, selected }) => (
              <li
                className={`${

                  active ? 'bg-blue-500 text-white' : 'bg-white text-black'
                }`}
              >

                {selected && <CheckIcon />}
                {person.name}
              </li>
            )}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

For the complete render prop API for each component, see the component API documentation.

Each component also exposes information about its current state via a data-headlessui-state attribute that you can use to conditionally apply different styles.

When any of the states in the render prop API are true, they will be listed in this attribute as space-separated strings so you can target them with a CSS attribute selector in the form [attr~=value].

For example, here's what the Combobox.Options component with some child Combobox.Option components renders when the combobox is open and the second option is both selected and active:

<!-- Rendered `Combobox.Options` -->
<ul data-headlessui-state="open">
  <li data-headlessui-state="">Wade Cooper</li>
  <li data-headlessui-state="active selected">Arlene Mccoy</li>
  <li data-headlessui-state="">Devon Webb</li>
</ul>

If you are using Tailwind CSS, you can use the @headlessui/tailwindcss plugin to target this attribute with modifiers like ui-open:* and ui-active:*:

import { useState, Fragment } from 'react'
import { Combobox } from '@headlessui/react'
import { CheckIcon } from '@heroicons/react/20/solid'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />
      <Combobox.Options>
        {filteredPeople.map((person) => (
          <Combobox.Option
            key={person.id}
            value={person}

            className="ui-active:bg-blue-500 ui-active:text-white ui-not-active:bg-white ui-not-active:text-black"
          >

            <CheckIcon className="hidden ui-selected:block" />
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

Unlike native HTML form controls which only allow you to provide strings as values, Headless UI supports binding complex objects as well.

When binding objects, make sure to set the displayValue on your Combobox.Input so that a string representation of the selected option can be rendered in the input:

import { useState } from 'react'
import { Combobox } from '@headlessui/react'


const people = [
  { id: 1, name: 'Durward Reynolds', unavailable: false },
  { id: 2, name: 'Kenton Towne', unavailable: false },
  { id: 3, name: 'Therese Wunsch', unavailable: false },
  { id: 4, name: 'Benedict Kessler', unavailable: true },
  { id: 5, name: 'Katelyn Rohan', unavailable: false },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (

    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}

        displayValue={(person) => person.name}
      />
      <Combobox.Options>
        {filteredPeople.map((person) => (
          <Combobox.Option
            key={person.id}

            value={person}
            disabled={person.unavailable}
          >
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

When binding objects as values, it's important to make sure that you use the same instance of the object as both the value of the Combobox as well as the corresponding Combobox.Option, otherwise they will fail to be equal and cause the combobox to behave incorrectly.

To make it easier to work with different instances of the same object, you can use the by prop to compare the objects by a particular field instead of comparing object identity:

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const departments = [
  { id: 1, name: 'Marketing', contact: 'Durward Reynolds' },
  { id: 2, name: 'HR', contact: 'Kenton Towne' },
  { id: 3, name: 'Sales', contact: 'Therese Wunsch' },
  { id: 4, name: 'Finance', contact: 'Benedict Kessler' },
  { id: 5, name: 'Customer service', contact: 'Katelyn Rohan' },
]


function DepartmentPicker({ selectedDepartment, onChange }) {
  const [query, setQuery] = useState('')

  const filteredDepartments =
    query === ''
      ? departments
      : departments.filter((department) => {
          return department.name.toLowerCase().includes(query.toLowerCase())
        })

  return (

    <Combobox value={selectedDepartment} by="id" onChange={onChange}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(department) => department.name}
      />
      <Combobox.Options>
        {filteredDepartments.map((department) => (
          <Combobox.Option key={department.id} value={department}>
            {department.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

You can also pass your own comparison function to the by prop if you'd like complete control over how objects are compared:

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const departments = [
  { id: 1, name: 'Marketing', contact: 'Durward Reynolds' },
  { id: 2, name: 'HR', contact: 'Kenton Towne' },
  { id: 3, name: 'Sales', contact: 'Therese Wunsch' },
  { id: 4, name: 'Finance', contact: 'Benedict Kessler' },
  { id: 5, name: 'Customer service', contact: 'Katelyn Rohan' },
]


function compareDepartments(a, b) {
  return a.name.toLowerCase() === b.name.toLowerCase()
}

function DepartmentPicker({ selectedDepartment, onChange }) {
  const [query, setQuery] = useState('')

  const filteredDepartments =
    query === ''
      ? departments
      : departments.filter((department) => {
          return department.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox
      value={selectedDepartment}

      by={compareDepartments}
      onChange={onChange}
    >
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(department) => department.name}
      />
      <Combobox.Options>
        {filteredDepartments.map((department) => (
          <Combobox.Option key={department.id} value={department}>
            {department.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

To allow selecting multiple values in your combobox, use the multiple prop and pass an array to value instead of a single option.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {

  const [selectedPeople, setSelectedPeople] = useState([people[0], people[1]])

  return (
    <Combobox value={selectedPeople} onChange={setSelectedPeople} multiple>
      {selectedPeople.length > 0 && (
        <ul>
          {selectedPeople.map((person) => (
            <li key={person.id}>{person.name}</li>
          ))}
        </ul>
      )}

      <Combobox.Input />
      <Combobox.Options>
        {people.map((person) => (
          <Combobox.Option key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

The displayValue prop is omitted because the selectedPeople is already displayed in a list above the input. If you wish to display the items in the Combobox.Input then the displayValue receives an array.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {

  const [selectedPeople, setSelectedPeople] = useState([people[0], people[1]])

  return (
    <Combobox value={selectedPeople} onChange={setSelectedPeople} multiple>
      <Combobox.Input

        displayValue={(people) =>
          people.map((person) => person.name).join(', ')
        }
      />
      <Combobox.Options>
        {people.map((person) => (
          <Combobox.Option key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

This will keep the combobox open when you are selecting options, and choosing an option will toggle it in place.

Your onChange handler will be called with an array containing all selected options any time an option is added or removed.

By default the Combobox will use the input contents as the label for screenreaders. If you'd like more control over what is announced to assistive technologies, use the Combobox.Label component.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>

      <Combobox.Label>Assignee:</Combobox.Label>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />
      <Combobox.Options>
        {filteredPeople.map((person) => (
          <Combobox.Option key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

If you add the name prop to your combobox, hidden input elements will be rendered and kept in sync with your selected value.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function Example() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <form action="/projects/1/assignee" method="post">
      <Combobox
        value={selectedPerson}
        onChange={setSelectedPerson}

        name="assignee"
      >
        <Combobox.Input
          onChange={(event) => setQuery(event.target.value)}
          displayValue={(person) => person.name}
        />
        <Combobox.Options>
          {filteredPeople.map((person) => (
            <Combobox.Option key={person.id} value={person}>
              {person.name}
            </Combobox.Option>
          ))}
        </Combobox.Options>
      </Combobox>
      <button>Submit</button>
    </form>
  )
}

This lets you use a combobox inside a native HTML <form> and make traditional form submissions as if your combobox was a native HTML form control.

Basic values like strings will be rendered as a single hidden input containing that value, but complex values like objects will be encoded into multiple inputs using a square bracket notation for the names:

<input type="hidden" name="assignee[id]" value="1" />
<input type="hidden" name="assignee[name]" value="Durward Reynolds" />

If you provide a defaultValue prop to the Combobox instead of a value, Headless UI will track its state internally for you, allowing you to use it as an uncontrolled component.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function Example() {
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <form action="/projects/1/assignee" method="post">

      <Combobox name="assignee" defaultValue={people[0]}>
        <Combobox.Input
          onChange={(event) => setQuery(event.target.value)}
          displayValue={(person) => person.name}
        />
        <Combobox.Options>
          {filteredPeople.map((person) => (
            <Combobox.Option key={person.id} value={person}>
              {person.name}
            </Combobox.Option>
          ))}
        </Combobox.Options>
      </Combobox>
      <button>Submit</button>
    </form>
  )
}

This can simplify your code when using the combobox with HTML forms or with form APIs that collect their state using FormData instead of tracking it using React state.

Any onChange prop you provide will still be called when the component's value changes in case you need to run any side effects, but you won't need to use it to track the component's state yourself.

You can allow users to enter their own value that doesn't exist in the list by including a dynamic Combobox.Option based on the query value.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function Example() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />
      <Combobox.Options>

        {query.length > 0 && (
          <Combobox.Option value={{ id: null, name: query }}>
            Create "{query}"
          </Combobox.Option>
        )}
        {filteredPeople.map((person) => (
          <Combobox.Option key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

Depending on what you're building it can sometimes make sense to render additional information about the active option outside of the <Combobox.Options>. For example, a preview of the active option within the context of a command palette. In these situations you can read the activeOption render prop argument to access this information.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>

      {({ activeOption }) => (
        <>
          <Combobox.Input
            onChange={(event) => setQuery(event.target.value)}
            displayValue={(person) => person.name}
          />
          <Combobox.Options>
            {filteredPeople.map((person) => (
              <Combobox.Option key={person.id} value={person}>
                {person.name}
              </Combobox.Option>
            ))}
          </Combobox.Options>


          {activeOption && (
            <div>The current active user is: {activeOption.name}</div>
          )}
        </>
      )}
    </Combobox>
  )
}

The activeOption will be the value of the current active Combobox.Option.

By default, your Combobox.Options instance will be shown/hidden automatically based on the internal open state tracked within the Combobox component itself.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />

      {/*
        By default, the `Combobox.Options` will automatically show/hide when
        typing in the `Combobox.Input`, or when pressing the `Combobox.Button`.
      */}
      <Combobox.Options>
        {filteredPeople.map((person) => (
          <Combobox.Option key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

If you'd rather handle this yourself (perhaps because you need to add an extra wrapper element for one reason or another), you can add a static prop to the Combobox.Options instance to tell it to always render, and inspect the open render prop provided by Combobox to control which element is shown/hidden yourself.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>

      {({ open }) => (
        <>
          <Combobox.Input
            onChange={(event) => setQuery(event.target.value)}
            displayValue={(person) => person.name}
          />

          {open && (
            <div>
              {/*
                Using `static`, `Combobox.Options` are always rendered
                and the `open` state is ignored.
              */}

              <Combobox.Options static>
                {filteredPeople.map((person) => (
                  <Combobox.Option key={person.id} value={person}>
                    {person.name}
                  </Combobox.Option>
                ))}
              </Combobox.Options>
            </div>
          )}
        </>
      )}
    </Combobox>
  )
}

Use the disabled prop to disable a Combobox.Option. This will make it unselectable via mouse and keyboard, and it will be skipped when pressing the up/down arrows.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds', unavailable: false },
  { id: 2, name: 'Kenton Towne', unavailable: false },
  { id: 3, name: 'Therese Wunsch', unavailable: false },
  { id: 4, name: 'Benedict Kessler', unavailable: true },
  { id: 5, name: 'Katelyn Rohan', unavailable: false },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />
      <Combobox.Options>
        {filteredPeople.map((person) => (
          /* Disabled options will be skipped by keyboard navigation. */
          <Combobox.Option
            key={person.id}
            value={person}

            disabled={person.unavailable}
          >
            <span className={person.unavailable ? 'opacity-75' : ''}>
              {person.name}
            </span>
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

By default, once you've selected a value in a combobox there is no way to clear the combobox back to an empty value — when you clear the input and tab away, the value returns to the previously selected value.

If you want to support empty values in your combobox, use the nullable prop.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds', unavailable: false },
  { id: 2, name: 'Kenton Towne', unavailable: false },
  { id: 3, name: 'Therese Wunsch', unavailable: false },
  { id: 4, name: 'Benedict Kessler', unavailable: true },
  { id: 5, name: 'Katelyn Rohan', unavailable: false },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (

    <Combobox value={selectedPerson} onChange={setSelectedPerson} nullable>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}

        displayValue={(person) => person?.name}
      />
      <Combobox.Options>
        {filteredPeople.map((person) => (
          <Combobox.Option key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

When the nullable prop is used, clearing the input and navigating away from the element will invoke your onChange and displayValue callbacks with null.

This prop doesn't do anything when allowing multiple values because options are toggled on and off, resulting in an empty array (rather than null) if nothing is selected.

To animate the opening/closing of the combobox panel, use the provided Transition component. All you need to do is wrap the Combobox.Options in a <Transition>, and the transition will be applied automatically.

import { useState } from 'react'
import { Combobox, Transition } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />

      <Transition
        enter="transition duration-100 ease-out"
        enterFrom="transform scale-95 opacity-0"
        enterTo="transform scale-100 opacity-100"
        leave="transition duration-75 ease-out"
        leaveFrom="transform scale-100 opacity-100"
        leaveTo="transform scale-95 opacity-0"
      >
        <Combobox.Options>
          {filteredPeople.map((person) => (
            <Combobox.Option key={person.id} value={person}>
              {person.name}
            </Combobox.Option>
          ))}
        </Combobox.Options>

      </Transition>
    </Combobox>
  )
}

By default our built-in Transition component automatically communicates with the Combobox components to handle the open/closed states. However, if you require more control over this behavior, you can explicitly control it:

import { useState } from 'react'
import { Combobox, Transition } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>

      {({ open }) => (
        <>
          <Combobox.Input
            onChange={(event) => setQuery(event.target.value)}
            displayValue={(person) => person.name}
          />
          {/*
            Use the `Transition` + `open` render prop argument to add transitions.
          */}
          <Transition

            show={open}
            enter="transition duration-100 ease-out"
            enterFrom="transform scale-95 opacity-0"
            enterTo="transform scale-100 opacity-100"
            leave="transition duration-75 ease-out"
            leaveFrom="transform scale-100 opacity-100"
            leaveTo="transform scale-95 opacity-0"
          >
            {/*
              Don't forget to add `static` to your `Combobox.Options`!
            */}

            <Combobox.Options static>
              {filteredPeople.map((person) => (
                <Combobox.Option key={person.id} value={person}>
                  {person.name}
                </Combobox.Option>
              ))}
            </Combobox.Options>
          </Transition>

        </>
      )}
    </Combobox>
  )
}

Because they're renderless, Headless UI components also compose well with other animation libraries in the React ecosystem like Framer Motion and React Spring.

By default, the Combobox and its subcomponents each render a default element that is sensible for that component.

For example, Combobox.Label renders a label by default, Combobox.Input renders an input, Combobox.Button renders a button, Combobox.Options renders a ul, and Combobox.Option renders a li. By contrast, Combobox does not render an element, and instead renders its children directly.

This is easy to change using the as prop, which exists on every component.

import { useState } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    /* Render a `div` instead of a React.Fragment */

    <Combobox as="div" value={selectedPerson} onChange={setSelectedPerson}>
      <Combobox.Input
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      />

      {/* Render a `div` instead of a `ul` */}

      <Combobox.Options as="div">
        {filteredPeople.map((person) => (
          /* Render a `span` instead of a `li` */

          <Combobox.Option as="span" key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

To tell an element to render its children directly with no wrapper element, use a Fragment.

import { useState, Fragment } from 'react'
import { Combobox } from '@headlessui/react'

const people = [
  { id: 1, name: 'Durward Reynolds' },
  { id: 2, name: 'Kenton Towne' },
  { id: 3, name: 'Therese Wunsch' },
  { id: 4, name: 'Benedict Kessler' },
  { id: 5, name: 'Katelyn Rohan' },
]

function MyCombobox() {
  const [selectedPerson, setSelectedPerson] = useState(people[0])
  const [query, setQuery] = useState('')

  const filteredPeople =
    query === ''
      ? people
      : people.filter((person) => {
          return person.name.toLowerCase().includes(query.toLowerCase())
        })

  return (
    <Combobox value={selectedPerson} onChange={setSelectedPerson}>
      {/* Render a `Fragment` instead of an `input` */}
      <Combobox.Input

        as={Fragment}
        onChange={(event) => setQuery(event.target.value)}
        displayValue={(person) => person.name}
      >
        <input />
      </Combobox.Input>
      <Combobox.Options>
        {filteredPeople.map((person) => (
          <Combobox.Option key={person.id} value={person}>
            {person.name}
          </Combobox.Option>
        ))}
      </Combobox.Options>
    </Combobox>
  )
}

When a Combobox is toggled open, the Combobox.Input stays focused.

The Combobox.Button is ignored for the default tab flow, this means that pressing Tab in the Combobox.Input will skip passed the Combobox.Button.

Clicking a Combobox.Button toggles the options list open and closed. Clicking anywhere outside of the options list will close the combobox.

CommandDescription

ArrowDown, or ArrowUp when Combobox.Input is focused

Opens combobox and focuses the selected item

Enter, Space, ArrowDown, or ArrowUp when Combobox.Button is focused

Opens combobox, focuses the input and selects the selected item

Esc when combobox is open

Closes combobox and restores the selected item in the input field

ArrowDown or ArrowUp when combobox is open

Focuses previous/next non-disabled item

Home or End when combobox is open

Focuses first/last non-disabled item

Enter when combobox is open

Selects the current item

Tab when combobox is open

Selects the current active item and closes the combobox

A–Z or a–z when combobox is open

Calls the onChange which allows you to filter the list

All relevant ARIA attributes are automatically managed.

The main Combobox component.

PropDefaultDescription
asFragment
String | Component

The element or component the Combobox should render as.

disabledfalse
Boolean

Use this to disable the entire combobox component & related children.

value—
T

The selected value.

defaultValue—
T

The default value when using as an uncontrolled component.

by—
keyof T | ((a: T, z: T) => boolean)

Use this to compare objects by a particular field, or pass your own comparison function for complete control over how objects are compared.

onChange—
(value: T) => void

The function to call when a new option is selected.

name—
String

The name used when using this component inside a form.

nullable—
Boolean

Whether you can clear the combobox or not.

multiplefalse
Boolean

Whether multiple options can be selected or not.

Render PropDescription
value

T

The selected value.

open

Boolean

Whether or not the combobox is open.

disabled

Boolean

Whether or not the combobox is disabled.

activeIndex

Number | null

The index of the active option or null if none is active.

activeOption

T | null

The active option or null if none is active.

The Combobox's input.

PropDefaultDescription
asinput
String | Component

The element or component the Combobox.Input should render as.

displayValue—
(item: T) => string

The string representation of your value.

Render PropDescription
open

Boolean

Whether or not the Combobox is open.

disabled

Boolean

Whether or not the Combobox is disabled.

The Combobox's button.

PropDefaultDescription
asbutton
String | Component

The element or component the Combobox.Button should render as.

Render PropDescription
value

T

The selected value.

open

Boolean

Whether or not the Combobox is open.

disabled

Boolean

Whether or not the Combobox is disabled.

A label that can be used for more control over the text your Combobox will announce to screenreaders. Its id attribute will be automatically generated and linked to the root Combobox component via the aria-labelledby attribute.

PropDefaultDescription
aslabel
String | Component

The element or component the Combobox.Label should render as.

Render PropDescription
open

Boolean

Whether or not the Combobox is open.

disabled

Boolean

Whether or not the Combobox is disabled.

The component that directly wraps the list of options in your custom Combobox.

PropDefaultDescription
asul
String | Component

The element or component the Combobox.Options should render as.

staticfalse
Boolean

Whether the element should ignore the internally managed open/closed state.

Note: static and unmount can not be used at the same time. You will get a TypeScript error if you try to do it.

unmounttrue
Boolean

Whether the element should be unmounted or hidden based on the open/closed state.

Note: static and unmount can not be used at the same time. You will get a TypeScript error if you try to do it.

holdfalse
boolean

Whether or not the active option should stay active even when the mouse leaves the active option.

Render PropDescription
open

Boolean

Whether or not the Combobox is open.

Used to wrap each item within your Combobox.

PropDefaultDescription
value—
T

The option value.

asli
String | Component

The element or component the Combobox.Option should render as.

disabledfalse
Boolean

Whether or not the option should be disabled for keyboard navigation and ARIA purposes.

Render PropDescription
active

Boolean

Whether or not the option is the active/focused option.

selected

Boolean

Whether or not the option is the selected option.

disabled

Boolean

Whether or not the option is the disabled for keyboard navigation and ARIA purposes.

If you're interested in predesigned component examples using Headless UI and Tailwind CSS, check out Tailwind UI — a collection of beautifully designed and expertly crafted components built by us.

It's a great way to support our work on open-source projects like this and makes it possible for us to improve them and keep them well-maintained.

Explore more predesigned examples→