overleaf/services/web/frontend/js/features/settings/components/emails/downshift-input.tsx

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import { useState, useEffect, forwardRef } from 'react'
import { useCombobox } from 'downshift'
import classnames from 'classnames'
import { escapeRegExp } from 'lodash'
type DownshiftInputProps = {
highlightMatches?: boolean
items: string[]
itemsTitle?: string
inputValue: string
label: string
setValue: (value: string) => void
inputRef?: React.ForwardedRef<HTMLInputElement>
showLabel?: boolean
showSuggestedText?: boolean
} & React.InputHTMLAttributes<HTMLInputElement>
const filterItemsByInputValue = (
items: DownshiftInputProps['items'],
inputValue: DownshiftInputProps['inputValue']
) => items.filter(item => item.toLowerCase().includes(inputValue.toLowerCase()))
function Downshift({
highlightMatches = false,
items,
itemsTitle,
inputValue,
placeholder,
label,
setValue,
disabled,
inputRef,
showLabel = false,
showSuggestedText = false,
}: DownshiftInputProps) {
const [inputItems, setInputItems] = useState(items)
useEffect(() => {
setInputItems(items)
}, [items])
const {
isOpen,
getLabelProps,
getMenuProps,
getInputProps,
getComboboxProps,
getItemProps,
highlightedIndex,
openMenu,
selectedItem,
} = useCombobox({
inputValue,
items: inputItems,
initialSelectedItem: inputValue,
onSelectedItemChange: ({ selectedItem }) => {
setValue(selectedItem ?? '')
},
onInputValueChange: ({ inputValue = '' }) => {
setInputItems(filterItemsByInputValue(items, inputValue))
},
onStateChange: ({ type }) => {
if (type === useCombobox.stateChangeTypes.FunctionOpenMenu) {
setInputItems(filterItemsByInputValue(items, inputValue))
}
},
})
const highlightMatchedCharacters = (item: string, query: string) => {
if (!query || !highlightMatches) return item
const regex = new RegExp(`(${escapeRegExp(query)})`, 'gi')
const parts = item.split(regex)
return parts.map((part, index) =>
regex.test(part) ? <strong key={`${part}-${index}`}>{part}</strong> : part
)
}
return (
<div
className={classnames(
'ui-select-container ui-select-bootstrap dropdown',
{
open: isOpen && inputItems.length,
}
)}
>
<div {...getComboboxProps()}>
{/* eslint-disable-next-line jsx-a11y/label-has-for */}
<label {...getLabelProps()} className={showLabel ? '' : 'sr-only'}>
{label}
</label>
<input
{...getInputProps({
onChange: (event: React.ChangeEvent<HTMLInputElement>) => {
setValue(event.target.value)
},
onFocus: () => {
if (!isOpen) {
openMenu()
}
},
ref: inputRef,
})}
className="form-control"
type="text"
placeholder={placeholder}
disabled={disabled}
/>
</div>
<ul
{...getMenuProps()}
className="ui-select-choices ui-select-choices-content ui-select-dropdown dropdown-menu"
>
{showSuggestedText && inputItems.length && (
<li className="ui-select-title">{itemsTitle}</li>
)}
{inputItems.map((item, index) => (
<li
className="ui-select-choices-group"
key={`${item}${index}`}
{...getItemProps({ item, index })}
>
<div
className={classnames('ui-select-choices-row', {
active: selectedItem === item,
'ui-select-choices-row--highlighted':
highlightedIndex === index,
})}
>
<span className="ui-select-choices-row-inner">
<span>{highlightMatchedCharacters(item, inputValue)}</span>
</span>
</div>
</li>
))}
</ul>
</div>
)
}
const DownshiftInput = forwardRef<
HTMLInputElement,
Omit<DownshiftInputProps, 'inputRef'>
>((props, ref) => <Downshift {...props} inputRef={ref} />)
DownshiftInput.displayName = 'DownshiftInput'
export default DownshiftInput