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
orBlob
is being read, and no error has occurred yet. DONE
- The read operation is complete. This could mean that: the entire
File
orBlob
has been read into memory, a file read error occurred, orabort()
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 API The definition of 'readyState' in that specification. |
Working Draft | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
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