id | cssPrefix | propComponents | section | subsection | ||
---|---|---|---|---|---|---|
Simple file upload |
pf-v6-c-file-upload |
|
components |
file-upload |
import FileUploadIcon from '@patternfly/react-icons/dist/esm/icons/file-upload-icon'; import ExclamationCircleIcon from '@patternfly/react-icons/dist/esm/icons/exclamation-circle-icon';
The FileUpload
component can accept a file via browse or drag-and-drop, and behaves like a standard form field with its value
and onFileInputChange
event that is similar to <input onChange="...">
prop. The type
prop determines how the FileUpload
component behaves upon accepting a file, what type of value it passes to its onDataChange
event.
If type="text"
is passed (and hideDefaultPreview
is not), a TextArea
preview will be rendered underneath the filename bar. When a file is selected, its contents will be read into memory and passed to the onDataChange
event as a string. Every filename change is passed to onFileInputChange
same as it would do with the <input>
element.
Pressing Clear button triggers onClearClick
event.
You can pass in the <FileUploadHelperText
sub-component via the children
property to <FileUpload>
.
A user can always type instead of selecting a file, but by default, once a user selects a text file from their disk they are not allowed to edit it (to prevent unintended changes to a format-sensitive file). This behavior can be changed with the allowEditingUploadedText
prop.
Typing/pasting text in the box will call onTextChange
with a string, and a string value is expected for the value
prop. :
Any props accepted by react-dropzone
's Dropzone
component can be passed as a dropzoneProps
object in order to customize the behavior of the Dropzone, such as restricting the size and type of files allowed. The following example will only accept CSV files smaller than 1 KB. Note that file type determination is not reliable across platforms (see the note on react-dropzone's docs about the accept
prop), so be sure to test the behavior of your file upload restriction on all browsers and operating systems targeted by your application.
Restricting file sizes and types in this way is for user convenience only, and it cannot prevent a malicious user from submitting anything to your server. As with any user input, your application should also validate, sanitize and/or reject restricted files on the server side.
If no type
prop is specified, the component will not read files directly. When a file is selected, a File
object will be passed as a second argument to onFileInputChange
and your application will be responsible for reading from it (e.g. by using the FileReader API or attaching it to a FormData object). A File
object will also be expected for the value
prop instead of a string, and no preview of the file contents will be shown by default. The onReadStarted
and onReadFinished
callbacks will also not be called since the component is not reading the file.
Regardless of type
, the preview area (the TextArea, or any future implementations of default previews for other types) can be removed by passing hideDefaultPreview
, and a custom one can be rendered by passing children
.
FileUpload
is a thin wrapper around the FileUploadField
presentational component. If you need to implement your own logic for accepting files, you can instead render a FileUploadField
directly, which does not include react-dropzone
and requires additional props (e.g. onBrowseButtonClick
, onClearButtonClick
, isDragActive
).
Note that the isLoading
prop is styled to position the spinner dead center above the entire component, so it should not be used with hideDefaultPreview
unless a custom empty-state preview is provided via children
. The below example prevents isLoading
and hideDefaultPreview
from being used at the same time. You can always provide your own spinner as part of the children
!
File upload uses the DropzoneOptions
type from react-dropzone. It is comprised of additional props with their own types. For more information on using DropzoneOptions
visit react-dropzone props and methods.
Additionally, it calls the onDataChange
, onReadFailed
, onReadFinished
, and onReadStarted
callbacks with an event of type DropEvent
. DropEvent
is a union comprised of the following types:
React.DragEvent<HTMLElement>
| React.ChangeEvent<HTMLInputElement>
| DragEvent
| Event