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
FileReaderhas been created, but no readAs method was called yet. LOADING-
A readAs method was invoked. A
FileorBlobis being read, and no error has occurred yet. DONE-
The read operation is complete. This could mean that: the entire
FileorBlobhas been read into memory, a file read error occurred, orabort()was called and the read was cancelled.
Examples
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 |
|---|
| File API # dom-filereader-readystate |
Browser compatibility
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