FileSystemFileEntry: createWriter() method
Deprecated
Avoid using this feature in new projects. This feature may be a candidate for removal from web standards or browsers.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
The FileSystemFileEntry interface's method
createWriter() returns a FileWriter object
which can be used to write data into the file represented by the directory entry.
Syntax
createWriter(successCallback)
createWriter(successCallback, errorCallback)
Parameters
successCallback-
A callback function which is called when the
FileWriterhas been created successfully; theFileWriteris passed into the callback as the only parameter. errorCallbackOptional-
If provided, this must be a method which is called when an error occurs while trying to create the
FileWriter. This callback receives as input aDOMExceptionobject describing the error.
Return value
None (undefined).
Examples
This example establishes a method, writeToFileEntry(), which outputs a
text string to the file corresponding to the passed-in directory entry.
function writeToFileEntry(entry, text) {
entry.createWriter(
(fileWriter) => {
let data = Blob([text], { type: "text/plain" });
fileWriter.write(data);
},
(error) => {
/* do whatever to handle the error */
},
);
}
The success callback for the createWriter() call takes the text which was
passed in and creates a new Blob object of type text/plain
that contains the passed text. This blob is then output to the FileWriter
object to be written to the file.
Specifications
This feature is not part of any specification anymore. It is no longer on track to become a standard.