Using useComboBox from DownShift with react-hook-form - react-hook-form

Question

I'm trying to use useComboBox from DownShift with react-hook-form and the value of the input is always undefined. I started with this: https://codesandbox.io/s/react-hook-form-controller-079xx?file=/src/DonwShift.js
And replaced the DownShift.js component with this: https://codesandbox.io/s/usecombobox-usage-1fs67?file=/src/index.js:168-438
Everything works except when I submit the value is undefined.What am I missing to set the value?
<form className="card" onSubmit={handleSubmit(handleShare)}>
<div className="body">
<Controller
as={Autocomplete}
control={control}
name="recipient"
items={userList}
/>
<button
className="secondaryActionBtn inputBtn"
type="submit"
enabled={String(formState.dirty)}
>
<FontAwesomeIcon icon={faPlus} />
</button>
{errors.lastname && 'Feed Name is required.'}
</div>
<footer></footer>
</form>
import React, { memo, useState } from 'react';
import PropTypes from 'prop-types';
import { useCombobox } from 'downshift';
const menuStyles = {
maxHeight: '180px',
overflowY: 'auto',
width: '135px',
margin: 0,
borderTop: 0,
background: 'white',
position: 'absolute',
zIndex: 1000,
listStyle: 'none',
padding: 0,
left: '135px'
};
const comboboxStyles = { display: 'inline-block', marginLeft: '5px' };
function Item({ isHighlighted, getItemProps, item, index }) {
return (
<li
style={isHighlighted ? { backgroundColor: '#bde4ff' } : {}}
key={`${item}${index}`}
{...getItemProps({ item, index })}
>
{item}
</li>
);
}
Item = memo(Item);
const Autocomplete = ({ items }) => {
const [inputItems, setInputItems] = useState(items);
const {
isOpen,
getToggleButtonProps,
getLabelProps,
getMenuProps,
getInputProps,
getComboboxProps,
highlightedIndex,
getItemProps
} = useCombobox({
items: inputItems,
onInputValueChange: ({ inputValue }) => {
setInputItems(
items.filter(item =>
item.toLowerCase().includes(inputValue.toLowerCase())
)
);
}
});
return (
<div>
<label htmlFor="recipient" {...getLabelProps()}>
Choose an element:
</label>
<div style={comboboxStyles} {...getComboboxProps()}>
<input name="recipient" {...getInputProps()} id="recipient" />
<button {...getToggleButtonProps()} aria-label="toggle menu">
↓
</button>
</div>
<ul {...getMenuProps()} style={menuStyles}>
{isOpen &&
inputItems.map((item, index) => (
<Item
key={item}
isHighlighted={highlightedIndex === index}
getItemProps={getItemProps}
item={item}
index={index}
/>
))}
</ul>
</div>
);
};
Autocomplete.propTypes = {
list: PropTypes.array
};
export default Autocomplete;

Answer 1

For others who get stuck on this here's how I solved it. The Controller in react-hook-form injects an onChange into the component as a prop. So i set the onSelectedItemChange prop in useCombobox hook to pass its value into onChange. Like this:
const {
isOpen,
getToggleButtonProps,
getLabelProps,
getMenuProps,
getInputProps,
getComboboxProps,
highlightedIndex,
getItemProps
} = useCombobox({
items: inputItems,
onSelectedItemChange: ({ inputValue }) => onChange(inputValue),
onInputValueChange: ({ inputValue }) => {
setInputItems(
items.filter(item =>
item.toLowerCase().includes(inputValue.toLowerCase())
)
);
}
});