webapp/src/components/_shared/GrowingTextarea/GrowingTextarea.tsx

import { clsx } from 'clsx'
import styles from './GrowingTextarea.module.scss'
import { createSignal, Show } from 'solid-js'

type Props = {
  class?: string
  placeholder: string
  initialValue?: string
  value: (string) => void
  maxLength?: number
}

export const GrowingTextarea = (props: Props) => {
  const [value, setValue] = createSignal('')
  const [isFocused, setIsFocused] = createSignal(false)
  const handleChangeValue = (event) => {
    setValue(event.target.value)
    props.value(event.target.value)
  }

  const handleKeyDown = async (event) => {
    if (event.key === 'Enter' && event.shiftKey) {
      return
    }

    if (event.key === 'Enter' && !event.shiftKey && value()?.trim().length > 0) {
      event.preventDefault()
    }
  }

  return (
    <div class={clsx(styles.GrowingTextarea)}>
      <div class={clsx(styles.growWrap, props.class)} data-replicated-value={value()}>
        <textarea
          rows={1}
          maxlength={props.maxLength}
          autocomplete="off"
          class={clsx(styles.textInput, props.class)}
          value={props.initialValue}
          onKeyDown={handleKeyDown}
          onInput={(event) => handleChangeValue(event)}
          placeholder={props.placeholder}
          onFocus={() => setIsFocused(true)}
          onBlur={() => setIsFocused(false)}
        />
      </div>
      <Show when={props.maxLength && value()}>
        <div
          class={clsx(styles.maxLength, {
            [styles.visible]: isFocused(),
            [styles.limited]: value().length === props.maxLength
          })}
        >
          {`${value().length} / ${props.maxLength}`}
        </div>
      </Show>
    </div>
  )
}