Web Reference for FileReader

interface FileReader

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.

Properties

readonly



error: DOMException | null



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



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



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



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



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



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

readonly



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

readonly



result: string
 | ArrayBuffer
 | null

readonly



EMPTY: 0

readonly



LOADING: 1

readonly



DONE: 2

Methods



abort(): void



readAsArrayBuffer(blob: Blob): void

deprecated



readAsBinaryString(blob: Blob): void



readAsDataURL(blob: Blob): void



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



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<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

variable FileReader

Properties

readonly



prototype: FileReader

readonly



EMPTY: 0

readonly



LOADING: 1

readonly



DONE: 2