Web/API/FileReader/readyState

The FileReader readyState property provides the current state of the reading operation a FileReader is in. A FileReader exists in one of the following states:

Value	State	Description
`0`	`EMPTY`	Reader has been created. None of the read methods called yet.
`1`	`LOADING`	A read method has been called.
`2`	`DONE`	The operation is complete.

EMPTY: The FileReader has been created, but no readAs method was called yet.
LOADING: A readAs method was invoked. A File or Blob is being read, and no error has occurred yet.
DONE: The read operation is complete. This could mean that: the entire File or Blob has been read into memory, a file read error occurred, or abort() was called and the read was cancelled.

Example

var reader = new FileReader();
console.log('EMPTY', reader.readyState); // readyState will be 0

reader.readAsText(blob);
console.log('LOADING', reader.readyState); // readyState will be 1

reader.onloadend = function () {
  console.log('DONE', reader.readyState); // readyState will be 2
};

Value

A number which is one of the three possible state constants define for the FileReader API.

Specifications

Specification	Status	Comment
File APIThe definition of 'readyState' in that specification.	Working Draft	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`readyState`	Chrome Full support 7	Edge Full support 12	Firefox Full support 3.6	IE Full support 10	Opera Full support 11	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 32	Opera Android Full support 11	Safari iOS Full support 6.1	Samsung Internet Android Full support Yes

Legend

Full support: Full support