Image uploading in KeystoneJS document editor

component-blocks.tsx

import React from 'react'
import { NotEditable, component, fields, FormField } from '@keystone-6/fields-document/component-blocks'
import { TAny } from '../types'
import { TImageFieldData, TImageFieldOptions, TImageFieldValue } from './types'
import { ImageUploader } from './components/ImageUploader'

const customFields = {
  image({ listKey }: TImageFieldOptions): FormField<TImageFieldValue, TImageFieldOptions> {
    return {
      kind: 'form',
      Input({ value, onChange }) {
        return <ImageUploader listKey={listKey} defaultValue={value} mode="edit" onChange={onChange} />
      },
      options: { listKey },
      defaultValue: null,
      validate(value) {
        return typeof value === 'object'
      },
    }
  },
}

export const componentBlocks: TAny = {
  image: component({
    preview: ({ fields }) => (
      <NotEditable>
        <ImageUploader
          listKey={fields.image.options.listKey}
          defaultValue={fields.imageRel.value?.data as TImageFieldData}
          imageAlt={fields.imageAlt.value}
          onChange={fields.image.onChange}
          onImageAltChange={fields.imageAlt.onChange}
          onRelationChange={fields.imageRel.onChange}
        />
      </NotEditable>
    ),
    label: 'Image',
    schema: {
      imageAlt: fields.text({
        label: 'Image Alt',
        defaultValue: '',
      }),
      image: customFields.image({
        listKey: 'Image',
      }),
      imageRel: fields.relationship({
        listKey: 'Image',
        label: 'Image Relation',
        selection: 'id, image { url }',
      }),
    },
    chromeless: true,
  }),
}

KeystoneImageUploader.tsx

/** @jsxRuntime classic */
/** @jsx jsx */

import { jsx } from '@keystone-ui/core'
import { FC } from 'react'
import styles from './styles'
import { IImageUploaderProps } from './types'
import useBase from './useBase'

export const ImageUploader: FC<IImageUploaderProps> = (props) => {
  const { altText, imageSrc, loading, isShowLabel, isShowImage, handleAltTextChange, handleUploadChange } =
    useBase(props)
  const { mode } = props

  return (
    <div css={styles.container(mode)}>
      <label id="file" css={styles.imageUploader(isShowImage)}>
        {isShowLabel && <span>🖱 Click to select a file...</span>}
        {loading && <span>Loading...</span>}
        <input
          autoComplete="off"
          type="file"
          accept={'image/*'}
          style={{ display: 'none' }}
          onChange={handleUploadChange}
        />
        <img
          src={imageSrc}
          alt={altText}
          css={styles.imagePreview}
          style={{ display: isShowImage ? 'block' : 'none' }}
        />
      </label>
      {mode === 'preview' && (
        <div css={styles.inputWrapper}>
          <label>Image Alt:</label>
          <input type="text" placeholder="" css={styles.textInput} value={altText} onChange={handleAltTextChange} />
        </div>
      )}
    </div>
  )
}

ImageUploader.defaultProps = {
  defaultValue: null,
  imageAlt: '',
  mode: 'preview',
}

styles.ts

/** @jsxRuntime classic */
/** @jsx jsx */

import { jsx } from '@keystone-ui/core'
import { FC } from 'react'
import styles from './styles'
import { IImageUploaderProps } from './types'
import useBase from './useBase'

export const ImageUploader: FC<IImageUploaderProps> = (props) => {
  const { altText, imageSrc, loading, isShowLabel, isShowImage, handleAltTextChange, handleUploadChange } =
    useBase(props)
  const { mode } = props

  return (
    <div css={styles.container(mode)}>
      <label id="file" css={styles.imageUploader(isShowImage)}>
        {isShowLabel && <span>🖱 Click to select a file...</span>}
        {loading && <span>Loading...</span>}
        <input
          autoComplete="off"
          type="file"
          accept={'image/*'}
          style={{ display: 'none' }}
          onChange={handleUploadChange}
        />
        <img
          src={imageSrc}
          alt={altText}
          css={styles.imagePreview}
          style={{ display: isShowImage ? 'block' : 'none' }}
        />
      </label>
      {mode === 'preview' && (
        <div css={styles.inputWrapper}>
          <label>Image Alt:</label>
          <input type="text" placeholder="" css={styles.textInput} value={altText} onChange={handleAltTextChange} />
        </div>
      )}
    </div>
  )
}

ImageUploader.defaultProps = {
  defaultValue: null,
  imageAlt: '',
  mode: 'preview',
}

types.ts

import { HydratedRelationshipData } from '@keystone-6/fields-document/dist/declarations/src/DocumentEditor/component-blocks/api'
import { TImageFieldValue } from '../../types'

export interface IImageUploaderProps {
  listKey: string
  defaultValue?: TImageFieldValue
  imageAlt?: string
  mode?: 'edit' | 'preview'
  onChange?(value: TImageFieldValue): void
  onImageAltChange?(value: string): void
  onRelationChange?(value: HydratedRelationshipData): void
}

useBase.ts

import { ChangeEvent, useCallback, useState } from 'react'
import { useMutation, gql } from '@keystone-6/core/admin-ui/apollo'
import { useList } from '@keystone-6/core/admin-ui/context'
import { useToasts } from '@keystone-ui/toast'
import { IImageUploaderProps } from './types'

const useBase = ({
  listKey,
  defaultValue,
  imageAlt,
  onChange,
  onImageAltChange,
  onRelationChange,
}: IImageUploaderProps) => {
  const [altText, setAltText] = useState(imageAlt ?? '')
  const [imageSrc, setImageSrc] = useState(defaultValue?.image?.url ?? '')

  const list = useList(listKey)
  const toasts = useToasts()

  const UPLOAD_IMAGE = gql`
    mutation ${list.gqlNames.createMutationName}($file: Upload!) {
      ${list.gqlNames.createMutationName}(data: { image: { upload: $file } }) {
        id, name, type, image { id, extension, filesize, height, width, url }
      }
    }
  `

  const [uploadImage, { loading }] = useMutation(UPLOAD_IMAGE)

  const uploadFile = useCallback(
    async (file: File) => {
      try {
        return await uploadImage({
          variables: { file },
        })
      } catch (err: any) {
        toasts.addToast({
          title: `Failed to upload file: ${file.name}`,
          tone: 'negative',
          message: err.message,
        })
      }

      return null
    },
    [toasts, uploadImage],
  )

  const handleAltTextChange = useCallback(
    async (e: ChangeEvent<HTMLInputElement>) => {
      const { value } = e.currentTarget
      setAltText(value)
      onImageAltChange?.(value)
    },
    [onImageAltChange],
  )

  const handleUploadChange = useCallback(
    async (e: ChangeEvent<HTMLInputElement>) => {
      const selectedFile = e.currentTarget.files?.[0]
      const src = selectedFile ? URL.createObjectURL(selectedFile) : ''
      setImageSrc(src)

      if (selectedFile) {
        const result = await uploadFile(selectedFile)
        const uploadedImage = result?.data?.createImage
        onChange?.({ id: uploadedImage.id })
        if (onRelationChange) {
          setTimeout(
            () => onRelationChange({ id: uploadedImage.id, label: uploadedImage.name, data: uploadedImage }),
            0,
          )
        }
      }
    },
    [onChange, onRelationChange],
  )

  return {
    altText,
    imageSrc,
    loading,
    isShowLabel: !loading && !imageSrc,
    isShowImage: !loading && !!imageSrc,
    handleAltTextChange,
    handleUploadChange,
  }
}

export default useBase

The gist is a great starting block, however you have Styles.ts code misplaced with the ImageUploader, and the type of TImageFieldValue is missing.

@wenisman Hi! See the full code here: https://github.com/proteye/keystone-cms

Thanks!