#### AutocompleteInput is an input which, enhanced with a suggestions pop-up, gives the user a more complete search experience when needed.

### 👍 Dos

- Help the user avoid errors.
- Semantically similar phrases or words but grammatically different should appear once. E.g.: "Dress" and "Dresses".
- Highlight the suggestions.

### 👎 Don'ts

- Exceed 10 suggestions. 6 is a great number of suggestions.

#### Simple Autocomplete mocking server responses

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  { value: 1, label: 'Bruno' },
  'Carlos',
  'Daniela',
]

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onSearch: (...args) => console.log('onSearch:', ...args),
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return <AutocompleteInput input={input} options={options} />
}

;<UsersAutocomplete />
```

#### Show search history

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  { value: 1, label: 'Bruno' },
  'Carlos',
  'Daniela',
]

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const [lastSearched, setLastSearched] = useState([])
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
    // --- This is what makes the Last Searched Terms work!
    // This can be stored anywhere the dev wants. To be persistent, for example.
    lastSearched: {
      value: lastSearched,
      label: 'Last searched users',
      onChange: option =>
        option && setLastSearched(uniq([...lastSearched, option])),
    },
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onSearch: (...args) => console.log('onSearch:', ...args),
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return <AutocompleteInput input={input} options={options} />
}

;<UsersAutocomplete />
```

#### Defined height with scroll

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  'Carlos',
  'Daniela',
  'Beatriz',
  'Bruno',
  'Camila',
  'Diego',
  'Eduardo',
  'Fernanda',
  'Gabriel',
  'Heloisa',
  'Igor',
  'Juliana',
  'Kaique',
  'Larissa',
  'Marcos',
  'Natália',
  'Otávio',
  'Patrícia',
  'Renato',
  'Sabrina',
  'Thiago',
  'Vanessa',
  'Wagner',
  'Xavier',
  'Yasmin',
  'Zeca',
  'Adriana',
  'Bernardo'
];

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const [lastSearched, setLastSearched] = useState([])
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
    // --- This is what makes the Last Searched Terms work!
    // This can be stored anywhere the dev wants. To be persistent, for example.
    lastSearched: {
      value: lastSearched,
      label: 'Last searched users',
      onChange: option =>
        option && setLastSearched(uniq([...lastSearched, option])),
    },
    maxHeight: 300,
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onSearch: (...args) => console.log('onSearch:', ...args),
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return <AutocompleteInput input={input} options={options} />
}

;<UsersAutocomplete />
```

#### Custom option rendering

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'

import User from '../icon/User'
import Search from '../icon/Search'

const allUsers = [
  'Ana',
  { value: 1, label: 'Ana Clara' },
  { value: 2, label: 'Ana Luiza', caption: 'VTEX' },
  { value: 3, label: 'Bruno' },
]

const CustomOption = props => {
  const { roundedBottom, searchTerm, value, selected, onClick } = props
  const [highlightOption, setHighlightOption] = useState(false)

  const renderOptionHighlightedText = () => {
    const highlightableText = typeof value === 'string' ? value : value.label
    const index = highlightableText
      .toLowerCase()
      .indexOf(searchTerm.toLowerCase())
    if (index === -1) {
      return highlightableText
    }
    const prefix = highlightableText.substring(0, index)
    const match = highlightableText.substr(index, searchTerm.length)
    const suffix = highlightableText.substring(index + match.length)
    return (
      <span className="truncate">
        <span className="fw7">{prefix}</span>
        {match}
        <span className="fw7">{suffix}</span>
      </span>
    )
  }

  const buttonClasses = `bn w-100 tl pointer pa4 f6 ${
    roundedBottom ? 'br2 br--bottom' : ''
  } ${highlightOption || selected ? 'bg-muted-5' : 'bg-base'}`

  const icon =
    typeof value === 'string' ? <Search size={14} /> : <User size={14} />

  // --- This is a good practice. Use <button />.
  return (
    <button
      className={buttonClasses}
      onFocus={() => setHighlightOption(true)}
      onMouseEnter={() => setHighlightOption(true)}
      onMouseLeave={() => setHighlightOption(false)}
      onClick={onClick}>
      <div className="flex items-center">
        <span className="mr3 c-muted-2 flex pt1">{icon}</span>
        <span className="pr2">{renderOptionHighlightedText()}</span>
        {typeof value !== 'string' && (
          <div className="t-mini c-muted-1">{value.caption}</div>
        )}
      </div>
    </button>
  )
}

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const [lastSearched, setLastSearched] = useState([])
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
    lastSearched: {
      value: lastSearched,
      label: 'Last searched users',
      onChange: option =>
        option && setLastSearched(uniq([...lastSearched, option])),
    },
    // --- This is what makes the custom option work!
    renderOption: props => <CustomOption {...props} />,
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onSearch: (...args) => console.log('onSearch:', ...args),
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return <AutocompleteInput input={input} options={options} />
}

;<UsersAutocomplete />
```

#### Size

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  { value: 1, label: 'Bruno' },
  'Carlos',
  'Daniela',
]

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const timeoutRef = useRef(null)

  const optionsSmall = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
    size: 'small',
  }

  const optionsRegular = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
    size: 'regular',
  }

  const optionsLarge = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
    size: 'large',
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onSearch: (...args) => console.log('onSearch:', ...args),
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return (
    <div>
      <span className="mr4">
        <AutocompleteInput input={input} options={optionsSmall} />
      </span>
      <span className="mr4">
        <AutocompleteInput input={input} options={optionsRegular} />
      </span>
      <span className="mr4">
        <AutocompleteInput input={input} options={optionsLarge} />
      </span>
    </div>
  )
}

;<UsersAutocomplete />
```

#### With error state

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  { value: 1, label: 'Bruno' },
  'Carlos',
  'Daniela',
]

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onSearch: (...args) => console.log('onSearch:', ...args),
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
    errorMessage: 'Required Field',
  }
  return <AutocompleteInput input={input} options={options} />
}

;<UsersAutocomplete />
```

#### Without search button 🔍

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  { value: 1, label: 'Bruno' },
  'Carlos',
  'Daniela',
]

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return <AutocompleteInput input={input} options={options} />
}

;<UsersAutocomplete />
```

#### With prefix or suffix

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'
import IconUser from '../icon/User'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  { value: 1, label: 'Bruno' },
  'Carlos',
  'Daniela',
]

const UsersAutocomplete = ({ suffix, prefix }) => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    prefix,
    suffix,
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return <AutocompleteInput input={input} options={options} />
}

;<>
  <div className="mb5">
    <UsersAutocomplete prefix={<IconUser size={16} />} />
  </div>
    <UsersAutocomplete suffix={<IconUser size={16} />} />
</>
```

#### Disabled AutocompleteInput

```jsx
import { useState, useRef } from 'react'

const DisabledAutocompleteInput = () => (
  <AutocompleteInput
    input={{
      value: 'Ana Luiza',
      disabled: true,
    }}
    options={{
      value: [],
    }}
  />
)

;<DisabledAutocompleteInput />
```

#### With a custom message

```jsx
import { uniq } from 'lodash'
import { useState, useRef } from 'react'
import Info from '../icon/Info'

const allUsers = [
  'Ana Clara',
  'Ana Luiza',
  { value: 1, label: 'Bruno' },
  'Carlos',
  'Daniela',
]

const UsersAutocomplete = () => {
  const [term, setTerm] = useState('')
  const [loading, setLoading] = useState(false)
  const timeoutRef = useRef(null)

  const options = {
    onSelect: (...args) => console.log('onSelect: ', ...args),
    loading,
    value: !term.length
      ? []
      : allUsers.filter(user =>
          typeof user === 'string'
            ? user.toLowerCase().includes(term.toLowerCase())
            : user.label.toLowerCase().includes(term.toLowerCase())
        ),
    customMessage: (
      <div className="w-100 pa4 f6 br2 br--bottom bg-base flex items-center">
        <div className="ph3 c-muted-1 flex">
          <Info />
        </div>
        <div className="c-on-base">
          Some of these users might not be from your organization
        </div>
      </div>
    ),
  }

  const input = {
    onChange: term => {
      if (term) {
        setLoading(true)
        if (timeoutRef.current) {
          clearTimeout(timeoutRef.current)
        }
        timeoutRef.current = setTimeout(() => {
          setLoading(false)
          setTerm(term)
          timeoutRef.current = null
        }, 1000)
      } else {
        setTerm(term)
      }
    },
    onClear: () => setTerm(''),
    placeholder: 'Search user... (e.g.: Ana)',
    value: term,
  }
  return <AutocompleteInput input={input} options={options} />
}

;<UsersAutocomplete />
```