FileReaderSync.readAsText()

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

blob

読み込み対象の DOM File または Blob。

encoding

オプションのパラメータは、使用するエンコーディングを指定します (例: iso-8859-1 または UTF-8)。存在しない場合、メソッドはそれに対して検出アルゴリズムを適用します。

入力データを表す DOMString。

The following exceptions can be raised by this method:

NotFoundError DOMException

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

SecurityError DOMException

Thrown if 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 DOMException

Thrown if the resource cannot be read due to a permission problem, like a concurrent lock.

EncodingError DOMException

Thrown if the resource is a data URL and exceed the limit length defined by each browser.

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