react-activestorage-provider

ActiveStorage is an amazing addition to Rails 5.2, and as usual the team have made it fantastically simple to use... if you’re generating HTML server-side, that is. This component aims to make it just as easy to use from React.

ActiveStorageProvider handles the direct upload of a file to an ActiveStorage service and the attachment of that file to your model. It uses the render props pattern so you can build your own upload widget.

Install

npm install --save react-activestorage-provider

Usage

ActiveStorageProvider makes it easy to add a simple upload button. When you call handleUpload with a FileList or an array of Files, this component creates a Blob record, uploads the file directly to your storage service, and then hits your Rails controller to attach the blob to your model. (If you want to handle the attachment yourself in order to, for example, provide other attributes, see the lower level DirectUploadProvider.)

import ActiveStorageProvider from 'react-activestorage-provider'

// ...

return (
  <ActiveStorageProvider
    endpoint={{
      path: '/profile',
      model: 'User',
      attribute: 'avatar',
      method: 'PUT',
    }}
    onSubmit={user => this.setState({ avatar: user.avatar })}
    render={({ handleUpload, uploads, ready }) => (
      <div>
        <input
          type="file"
          disabled={!ready}
          onChange={e => handleUpload(e.currentTarget.files)}
        />

        {uploads.map(upload => {
          switch (upload.state) {
            case 'waiting':
              return <p key={upload.id}>Waiting to upload {upload.file.name}</p>
            case 'uploading':
              return (
                <p key={upload.id}>
                  Uploading {upload.file.name}: {upload.progress}%
                </p>
              )
            case 'error':
              return (
                <p key={upload.id}>
                  Error uploading {upload.file.name}: {upload.error}
                </p>
              )
            case 'finished':
              return (
                <p key={upload.id}>Finished uploading {upload.file.name}</p>
              )
          }
        })}
      </div>
    )}
  />
)

ActiveStorageProvider Props

These are your options for configuring ActiveStorageProvider.

RenderProps

This is the type of the argument with which your render function will be called.

export type RenderProps = {
  ready: boolean /* false while any file is uploading */,
  uploads: ActiveStorageFileUpload[] /* uploads in progress */,

  handleUpload: (FileList | File[]) => mixed /* call to initiate an upload */,

  /* or, if you want more granular control... */

  /* call to set list of files to be uploaded */
  handleChooseFiles: (FileList | File[]) => mixed,
  /* then call to begin the upload of the files in the list */
  handleBeginUpload: () => mixed,
}

type ActiveStorageFileUpload =
  | { state: 'waiting', id: string, file: File }
  | { state: 'uploading', id: string, file: File, progress: number }
  | { state: 'error', id: string, file: File, error: string }
  | { state: 'finished', id: string, file: File }

DirectUploadProvider

ActiveStorageProvider makes it simple to add a quick “upload” button by taking care of both uploading and attaching your file, but it shouldn’t stand in your way if you’re doing something more interesting. If you want to handle the second step, attaching your Blob record to your model, yourself, you can use the lower level DirectUploadProvider. It creates the blob records and uploads the user’s files directly to your storage service, then calls you back with the signed ids of those blobs. Then, you can create or update your model as you need.

function PostForm() {
  function handleAttachment(signedIds) {
    const body = JSON.stringify({ post: { title: ..., images: signedIds }})
    fetch('/posts.json', { method: 'POST', body })
  }

  return (
    <DirectUploadProvider multiple onSuccess={handleAttachment} render={...} />
  )
}

DirectUploadProvider is a named export, so

import { DirectUploadProvider } from 'react-activestorage-provider'

and use it with the following props: