The FileReaderSync
interface allows to read File
or Blob
objects synchronously.
Note: This feature is available in Web Workers
Warning: This interface is only available in workers as it enables synchronous I/O that could potentially block.
The FileReaderSync
interface allows to read File
or Blob
objects synchronously.
Note: This feature is available in Web Workers
Warning: This interface is only available in workers as it enables synchronous I/O that could potentially block.
FileReaderSync()
Returns a new FileReaderSync
object.
This interface does not have any properties.
FileReaderSync.readAsArrayBuffer()
This method converts a specified Blob
or a File
into an ArrayBuffer
representing the input data as a binary string.
FileReaderSync.readAsBinaryString()
Deprecated
This method converts a specified Blob
or a File
into a string representing the input data as a binary string. This method is deprecated, consider using readAsArrayBuffer()
instead.
FileReaderSync.readAsText()
This method converts a specified Blob
or a File
into a string representing the input data as a text string. The optional encoding
parameter indicates the encoding to be used (e.g., iso-8859-1 or UTF-8). If not present, the method will apply a detection algorithm for it.
FileReaderSync.readAsDataURL()
This method converts a specified Blob
or a File
into a string representing the input data as a data URL.
Specification |
---|
File API # FileReaderSync |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
FileReaderSync |
7 | 12 | 8 | 10 | ≤12.1 | 6 | 4.4 | 18 | 8 | ≤12.1 | 6 | 1.0 |
FileReaderSync |
7 | 12 | 8 | 10 | ≤12.1 | 6 | 4.4 | 18 | 8 | ≤12.1 | 6 | 1.0 |
readAsArrayBuffer |
9 | 12 | 8 | 10 | ≤12.1 | 6 | 4.4 | 18 | 8 | ≤12.1 | 6 | 1.0 |
readAsBinaryString |
7 | 12 | 8 | 11 | 15 | 6 | 4.4 | 18 | 8 | 14 | 6 | 1.0 |
readAsDataURL |
7 | 12 | 8 | 10 | ≤12.1 | 6 | 4.4 | 18 | 8 | ≤12.1 | 6 | 1.0 |
readAsText |
7 | 12 | 8 | 10 | ≤12.1 | 6 | 4.4 | 18 | 8 | ≤12.1 | 6 | 1.0 |
worker_support |
7 | 12 | 8 | 10 | ≤15 | 6 | 4.4 | 18 | 8 | ≤14 | 6 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/FileReaderSync