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Upload

Info
Demos
Properties
Events

Import

import { Upload } from '@dnb/eufemia'

Description

The Upload component should be used in scenarios where the user has to upload any kind of files.

How to use the Upload component

  • Files selected by the user should be uploaded immediately (temporary location).
  • The user should be able to remove them (files) during the session.
  • The Upload component connects to the GlobalStatus and displays file error messages there as well.
  • Validation messages coming from the "backend" should be displayed for each file via the useUpload hook. See example below.
  • The useUpload hook can be placed on any location in your application, and does not need to be where the Upload component is used.
function YourComponent() {
  const { files, setFiles } = Upload.useUpload('unique-id')


  React.useEffect(() => {
    setFiles(
      files.map((fileItem) => {
        if (fileItem.file.name === fileNameFromBackend) {
          fileItem.errorMessage = 'Your message from the backend'
        }
        return fileItem
      }),
    )
  }, [fileNameFromBackend])


  return <Upload id="unique-id" />
}

JPG vs JPEG

When jpg is defined (most commonly used), then the component will also accept jpeg files.

Backend integration

The "backend" receiving the files is decoupled and can be any existing or new system.

Limit the amount of files

By default, the Upload component accepts multiple files. You can use the property filesAmountLimit={1} to make the component accept only one file.

Page wide drop support

Once the Upload component mounts, it also adds support for dropping files to the entire browser body.

NB: When you have several mounted components, only the first Upload component will receive the dropped files.

Demos

Upload (default)

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Tillatte filformater:
JPG, PNG
Maks filstørrelse:
5 MB
Code Editor
<Upload acceptedFileTypes={['jpg', 'png']} id="upload-basic" />

'useUpload' React Hook

By using the Upload.useUpload you can remove or add files or the status displayed in the component.

You can also use the file blob in combination with the FileReader API.

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Tillatte filformater:
JPG, PNG
Maks filstørrelse:
5 MB
Code Editor
const Component = () => {
  const { files, setFiles } = Upload.useUpload('upload-remove-files')
  return (
    <>
      <Upload
        acceptedFileTypes={['jpg', 'png']}
        id="upload-remove-files"
      />

      <Button
        top="small"
        disabled={files.length < 1}
        onClick={() => setFiles([])}
      >
        Remove selected files
      </Button>

      <Preview files={files} />
    </>
  )
  function Preview({ files }) {
    const [images, setImages] = React.useState([])
    React.useEffect(() => {
      files.map(({ file }) => {
        let reader = new FileReader()
        reader.addEventListener(
          'load',
          (event) => {
            images.push({
              blob: event.target,
              file,
            })
            setImages([...images])
            reader = null
          },
          false,
        )
        reader.readAsDataURL(file)
      })
    }, [files])
    return (
      <Section aria-label="List of chosen images">
        {images.map((img, i) => (
          <Img
            top
            key={i}
            src={img.blob.result}
            alt={img.file.name}
            height={100}
          />
        ))}
      </Section>
    )
  }
}
render(<Component />)

Upload single file/fixed amount of files

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Tillatte filformater:
JPG, PNG
Maks filstørrelse:
5 MB
Maks antall filer:
1
Code Editor
const Component = () => {
  const { files, setFiles } = Upload.useUpload('upload-single-file')
  if (files.length) {
    console.log('files', files, setFiles)
  }
  return (
    <Upload
      acceptedFileTypes={['jpg', 'png']}
      id="upload-single-file"
      filesAmountLimit={1}
    />
  )
}
render(<Component />)

Upload loading state

When uploading the file you can set the loading state of the request using the Upload.useUpload hook and passing isLoading to the file that is being uploaded.

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Tillatte filformater:
JPG, PNG
Maks filstørrelse:
5 MB
Code Editor
const Component = () => {
  const { files, setFiles } = Upload.useUpload('upload-is-loading')
  useMockFiles(setFiles, {
    isLoading: true,
  })
  return (
    <>
      <Upload acceptedFileTypes={['jpg', 'png']} id="upload-is-loading" />
      <ToggleButton
        top="small"
        disabled={files.length < 1}
        on_change={({ checked }) =>
          setFiles(
            files.map((fileItem) => {
              return {
                ...fileItem,
                isLoading: checked,
              }
            }),
          )
        }
      >
        Files is loading toggle
      </ToggleButton>
    </>
  )
}
render(<Component />)

Upload error message

The only file verification the Upload component does is for the file size and the file type. These errors are handled by the HTML element input so they aren't selectable. If you want any other error messages you can use the Upload.useUpload hook the same way as with the loading state.

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Tillatte filformater:
JPG, PNG
Maks filstørrelse:
5 MB
Code Editor
const Component = () => {
  const { files, setFiles } = Upload.useUpload('upload-error-message')
  return (
    <>
      <Upload
        acceptedFileTypes={['jpg', 'png']}
        id="upload-error-message"
      />
      <ToggleButton
        top="small"
        disabled={files.length < 1}
        on_change={({ checked }) => {
          setFiles(
            files.map((fileItem) => {
              return {
                ...fileItem,
                errorMessage: checked ? 'custom error message' : null,
              }
            }),
          )
        }}
      >
        Toggle error message
      </ToggleButton>
    </>
  )
}
render(<Component />)

Upload specific accepted file formats

You can pass the file formats as a string array. This will restrict which files that can be selected.

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Tillatte filformater:
JPG, PDF, PNG
Maks filstørrelse:
5 MB
Code Editor
const Component = () => {
  const { files, setFiles } = Upload.useUpload('upload-accepted-formats')
  if (files.length) {
    console.log('files', files, setFiles)
  }
  return (
    <Upload
      acceptedFileTypes={['png', 'jpg', 'pdf']}
      id="upload-accepted-formats"
    />
  )
}
render(<Component />)

Upload with prefilled error

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Tillatte filformater:
JPG, PNG
Maks filstørrelse:
5 MB
Code Editor
const Component = () => {
  const { files, setFiles } = Upload.useUpload('file-list')
  if (files.length) {
    console.log('files', files)
  }
  useMockFiles(setFiles, {
    errorMessage: 'This is no real file!',
  })
  return <Upload acceptedFileTypes={['jpg', 'png']} id="file-list" />
}
render(<Component />)

Upload with file max size based on file type

The table of accepted file types is sorted descending by maxFileSize. Multiple fileType for the same maxFileSize is sorted alphabetically ascending by fileType.

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Tillatte filformater og maks filstørrelse
Tillatte filformater:Maks filstørrelse:
ODT, PDF, ZIP99 MB
XLS, XLSX7 MB
HTM, HTML6 MB
TIF, TIFF5 MB
DOC, DOCX4 MB
DOC, GIF, JPG, SVG1 MB
TEXT, TXT

To disable maxFileSize Use either 0 or false. If maxFileSize is not provided, it defaults to the value of Uploads fileMaxSize which defaults to 5 MB.

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Tillatte filformater og maks filstørrelse
Tillatte filformater:Maks filstørrelse:
SVG5 MB
DOC, JPG
Code Editor
<Upload
  id="upload-file-max-size-based-on-file-format-disabled"
  acceptedFileTypes={[
    {
      fileType: 'jpg',
      fileMaxSize: 0,
    },
    {
      fileType: 'doc',
      fileMaxSize: false,
    },
    {
      fileType: 'svg',
    },
  ]}
/>

Upload without file max size

You can disable the file max size, which will deactivate all file size verifications in the Upload component. This can also be used to manually implement more complex file max size verifications.

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Tillatte filformater:
JPG, PDF
Code Editor
<Upload
  acceptedFileTypes={['jpg', 'pdf']}
  id="upload-disabled-file-max-size"
  fileMaxSize={false}
/>