readAsArrayBuffer メソッドは、指定された Blob ないし File オブジェクトの内容を読み込むために使用します。読込処理が終了すると readyStateDONE に変わり、 loadend イベントが生じます。それと同時に、 result プロパティにはファイルのデータを表す ArrayBuffer が格納されます。




メソッドで読み込む Blob または File オブジェクトです。


Specification Status Comment
File API
The definition of 'FileReader' in that specification.
Working Draft Initial definition


Feature Firefox (Gecko) Chrome Edge Internet Explorer Opera Safari
Basic support 3.6 (1.9.2)[1] 7 (Yes) 10 12.02[2] 6.0
Support in Web Workers 46 (46) (Yes) (Yes) No support (Yes) No support
error property uses DOMException, not DOMError 58 (58) (Yes) (Yes) No support (Yes) No support
Feature Firefox Mobile (Gecko) Android Edge IE Mobile Opera Mobile Safari Mobile
Basic support 32 3 (Yes) 10 11.5 6.1
Support in Web Workers 46.0 (46) (Yes) (Yes) No support (Yes) No support
error property uses DOMException, not DOMError 58.0 (58) ? (Yes) No support (Yes) No support

[1] Prior to Gecko 2.0 beta 7 (Firefox 4.0 beta 7), all Blob parameters below were File parameters; this has since been updated to match the specification correctly. Prior to Gecko 13.0 (Firefox 13.0 / Thunderbird 13.0 / SeaMonkey 2.10) the FileReader.error property returned a FileError object. This interface has been removed and FileReader.error is now returning the DOMError object as defined in the latest FileAPI draft.

[2] Opera has partial support in 11.1.



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