Baseline Widely available
Note: This feature is available in Web Workers.
The readyState read-only property of the FileReader interface provides the current state of the reading operation. This will be one of the states: EMPTY, LOADING, or DONE.
A number which is one of the three possible state constants defined on the FileReader interface:
FileReader.EMPTY (0)
Reader has been created, but none of the read methods have been called yet.
FileReader.LOADING (1)
A read method has been called. A File or Blob is being read, and no error has occurred yet.
FileReader.DONE (2)
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.
const 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 = () => {
console.log("DONE", reader.readyState); // readyState will be 2
};
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