React-butterfiles NPM

🦋 react-butterfiles

npm.io

A small component for building file upload fields of any type, for example a simple file upload button or an image gallery field with drag and drop support and preview of selected images.

Install

npm install --save react-butterfiles

Or if you prefer yarn:

yarn add react-butterfiles

Quick Example:

Create a simple file field which consists of a drop zone and a file upload button (for cases where drag and drop is not convenient). Multiple PDF / JPG files are accepted, but with the following restrictions:

3 files max
max 2MB in size per file
max 10MB in size for the whole selection

import Files from "react-butterfiles";

<Files
    multiple={true} 
    maxSize="2mb"
    multipleMaxSize="10mb"
    multipleMaxCount={3}
    accept={["application/pdf","image/jpg","image/jpeg"]}
    onSuccess={files => this.setState({ files })}
    onError={errors => this.setState({ errors })}
>
    {({ browseFiles, getDropZoneProps, getLabelProps }) => (
        <>
            <label {...getLabelProps()}>Your files</label>
            <div {...getDropZoneProps({ className: "myDropZone" })}/>
            <button onClick={browseFiles}>Select files...</button>
            <ol>
                {this.state.files.map(file => (
                    <li key={file.name}>{file.name}</li>
                ))}
                {this.state.errors.map(error => (
                    <li key={error.file.name}>
                        {error.file.name} - {error.type}
                    </li>
                ))}
            </ol>
        </>
    )}
</Files>

More examples on https://react-butterfiles.netlify.com.

Props

Prop	Type	Default	Description
`accept`	`Array<string>`	`[]`	Defines which file types will be accepted. Example: `["application/pdf"]`.
`multiple`	`boolean`	`false`	Allow multiple file selection by setting this prop to `true.
`maxSize`	`string`	`"2mb"`	Defines maximum file size (bytes lib used behind the scenes). Example: `"10mb"`
`multipleMaxSize`	`string`	`"10mb"`	Useful only if `multiple` prop is set to `true`. Defines max. file size of all selected files.
`multipleMaxCount`	`number`	`null`	Useful only if `multiple` prop is set to `true`. Defines max. allowed selected files.
`convertToBase64`	`boolean`	`false`	If `true`, selected files will also be converted to baser64 format (useful when working with images / thumbnails).
`onSuccess`	`(files: Array<SelectedFile>) => void`	`undefined`	Callback that will get executed once a valid file selection has been made (via browse files dialog or drag and drop). Each file will have a random `id` assigned to it.
`onError`	`(errors: Array<FileError>) => void`	`undefined`	Callback that will get executed once an invalid file selection has been made. Each error will have a random `id` assigned to it. More info about possible errors below.

Render (children) prop

Render prop gives you access to three callbacks:

Prop	Type	Description
`browseFiles`	`BrowseFilesParams => void`	Once executed, file browser will be shown. Useful for file upload buttons. The callback can also accept custom `onSuccess` and `onError` callbacks, that will override the main ones.
`validate`	`(files: Array<File>) => Array<FileError>`	Enables manual validation of files. Eg. after editing the selected image in an image editor.
`getDropZoneProps`	`(additionalProps: ?Object) => Object`	Props that need to be spread to a drop zone. Additional props can be passed, for example `className` or `style`.
`getLabelProps`	`(additionalProps: ?Object) => Object`	Props that need to be spread to your file field's label. Additional props can be passed, for example `className` or `style`.

Note that you don't need to have both upload file and drop zone, you can use only one if that's your requirement. For example, to create a simple file field, you would only need to use the browseFiles callback.

Selection error types

While selecting and dropping files, if there are one or more that do not comply with the rules that were set via props, an onError callback will be triggered, with all of the errors passed as the first argument.

Every error in the array will have one of the following error types.

Type	Description
`unsupportedFileType`	This can only happen via drag and drop since file browser dialog won't let users choose files of invalid type.
`maxSizeExceeded`	One or more file sizes are greater than `maxSize` value.
`multipleMaxCountExceeded`	User selected more files than allowed (more than `multipleMaxCount`).
`multipleMaxSizeExceeded`	User selected one or more files with their total size greater than allowed (more than `multipleMaxSize`).
`multipleNotAllowed`	This can only happen via drag and drop since file browser dialog won't let users select two or more files if `multiple` was not set to `true`.