FileReader

interface

interface FileReader extends EventTarget

Lets web applications asynchronously read the contents of files (or raw data buffers) stored on the user's computer, using File or Blob objects to specify the file or data to read.

variable

var FileReader: { … }

The constructor object for FileReader, used to create a reader that asynchronously reads the contents of a Blob or File into memory.

Constructors

`constructor`

new FileReader(): FileReader

Properties

`error`

readonly error: DOMException | null

`onabort`

onabort: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null

`onerror`

onerror: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null

`onload`

onload: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null

`onloadend`

onloadend: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null

`onloadstart`

onloadstart: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null

`onprogress`

onprogress: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null

`readyState`

readonly readyState: typeof FileReader.EMPTY | typeof FileReader.LOADING | typeof FileReader.DONE

`result`

readonly result: string | ArrayBuffer | null

`EMPTY`

readonly EMPTY: 0

readonly EMPTY: 0

`LOADING`

readonly LOADING: 1

readonly LOADING: 1

`DONE`

readonly DONE: 2

readonly DONE: 2

`prototype`

readonly prototype: FileReader

Methods

`abort`

abort(): void

`readAsArrayBuffer`

readAsArrayBuffer(blob: Blob): void

`readAsBinaryString`

readAsBinaryString(blob: Blob): void

Deprecated.

`readAsDataURL`

readAsDataURL(blob: Blob): void

`readAsText`

readAsText(blob: Blob, encoding?: string): void

`addEventListener`

addEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void

addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void

`removeEventListener`

removeEventListener<K extends keyof FileReaderEventMap>(type: K, listener: (this: FileReader, ev: FileReaderEventMap[K]) => any, options?: boolean | EventListenerOptions): void

removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void