readAsText method is used to read the contents of the specified
File. When the read operation is complete, the
readyState is changed to
loadend event is triggered, and the
result attribute contains the contents of the file as a text string.
Filefrom which to read.
- encoding Optional
- A string specifying the encoding to use for the returned data. By default, UTF-8 is assumed if this parameter is not specified.
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)||7||(Yes)||10||12.02||6.0.2|
|Feature||Firefox Mobile (Gecko)||Android||Edge||IE Mobile||Opera Mobile||Safari Mobile|
 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.
 IE9 has a File API Lab.
 Opera has partial support in 11.1.