The FileSystemFileEntry interface's method file() returns a File object which can be used to read data from the file represented by the directory entry.
file(successCallback)
file(successCallback, errorCallback)
successCallback
A callback function which is called when the File has been created successfully; the File is passed into the callback as the only parameter.
errorCallback Optional
If provided, this must be a method which is called when an error occurs while trying to create the File. This callback receives as input a DOMException object describing the error.
None (undefined).
This example establishes a method, readFile(), reads a text file and calls a specified callback function with the received text (in a string) once the read is completed. If an error occurs, a specified (optional) error callback is called.
function readFile(entry, successCallback, errorCallback) {
entry.file((file) => {
let reader = new FileReader();
reader.onload = () => {
successCallback(reader.result);
};
reader.onerror = () => {
errorCallback(reader.error);
};
reader.readAsText(file);
}, errorCallback);
}
This function calls file(), specifying as its success callback a method which proceeds to use a FileReader to read the file as text. The FileReader's load event handler is set up to deliver the loaded string to the successCallback specified when the readFile() method was called; similarly, its error handler is set up to call the errorCallback specified.
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