Interface FileReader
DONE: 2;
EMPTY: 0;
error: DOMException;
LOADING: 1;
onabort: (this: FileReader, ev: ProgressEvent<FileReader>) => any;
onerror: (this: FileReader, ev: ProgressEvent<FileReader>) => any;
onload: (this: FileReader, ev: ProgressEvent<FileReader>) => any;
onloadend: (this: FileReader, ev: ProgressEvent<FileReader>) => any;
onloadstart: (this: FileReader, ev: ProgressEvent<FileReader>) => any;
onprogress: (this: FileReader, ev: ProgressEvent<FileReader>) => any;
readyState: 0 | 1 | 2;
result: string | ArrayBuffer;
abort(): 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;
dispatchEvent(event: Event): boolean;
readAsArrayBuffer(blob: Blob): void;
readAsBinaryString(blob: Blob): void;
readAsDataURL(blob: Blob): void;
readAsText(blob: Blob, encoding?: string): 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;
}
Hierarchy
- EventTarget
- FileReader (View Summary)
Properties
ReadonlyDONE
ReadonlyEMPTY
Readonlyerror
ReadonlyLOADING
onabort
onerror
onload
onloadend
onloadstart
onprogress
ReadonlyreadyState
Readonlyresult
Methods
abort
addEventListener
- addEventListener<K extends keyof FileReaderEventMap>(
type: K,
listener: (this: FileReader, ev: FileReaderEventMap[K]) => any,
options?: boolean | AddEventListenerOptions,
): void Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.
The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.
When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.
When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.
When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.
If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.
The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture.
Type Parameters
- K extends keyof FileReaderEventMap
Parameters
- type: K
- listener: (this: FileReader, ev: FileReaderEventMap[K]) => any
Optionaloptions: boolean | AddEventListenerOptions
Returns void
- addEventListener(
type: string,
listener: EventListenerOrEventListenerObject,
options?: boolean | AddEventListenerOptions,
): void Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.
The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.
When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.
When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.
When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.
If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.
The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture.
Parameters
- type: string
- listener: EventListenerOrEventListenerObject
Optionaloptions: boolean | AddEventListenerOptions
Returns void
dispatchEvent
readAsArrayBuffer
readAsBinaryString
readAsDataURL
readAsText
removeEventListener
- removeEventListener<K extends keyof FileReaderEventMap>(
type: K,
listener: (this: FileReader, ev: FileReaderEventMap[K]) => any,
options?: boolean | EventListenerOptions,
): void Removes the event listener in target's event listener list with the same type, callback, and options.
Type Parameters
- K extends keyof FileReaderEventMap
Parameters
- type: K
- listener: (this: FileReader, ev: FileReaderEventMap[K]) => any
Optionaloptions: boolean | EventListenerOptions
Returns void
- removeEventListener(
type: string,
listener: EventListenerOrEventListenerObject,
options?: boolean | EventListenerOptions,
): void Removes the event listener in target's event listener list with the same type, callback, and options.
Parameters
- type: string
- listener: EventListenerOrEventListenerObject
Optionaloptions: boolean | EventListenerOptions
Returns void
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.
MDN Reference