FileReaderSync.readAsText()

Syntax

readAsText(File);
readAsText(Blob);
readAsText(File, encoding);
readAsText(Blob, encoding);

Parameters

blob

The DOM File or Blob to read.

encoding

The optional parameter specifies encoding to be used (e.g., iso-8859-1 or UTF-8). If not present, the method will apply a detection algorithm for it.

Return value

An DOMString representing the input data.

Exceptions

The following exceptions can be raised by this method:

NotFoundError

is raised when the resource represented by the DOM File or Blob cannot be found, e.g. because it has been erased.

SecurityError

is raised when one of the following problematic situation is detected:

• the resource has been modified by a third party;
• too many read are performed simultaneously;
• the file pointed by the resource is unsafe for a use from the Web (like it is a system file).

NotReadableError

is raised when the resource cannot be read due to a permission problem, like a concurrent lock.

EncodingError

is raised when the resource is a data URL and exceed the limit length defined by each browser.

Specifications

Browser Compatibility

See also

• File API
• File
• FileReaderSync
• FileReader
• BlobBuilder, Blob