Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Note: This method is deprecated in favor of
readAsBinaryString() method of the
FileReaderSync interface allows to read
Blob objects in a synchronous way into an
DOMString. This interface is only available in workers as it enables synchronous I/O that could potentially block.
DOMString representing the input data.
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).
Thrown if the resource cannot be read due to a permission problem, like a concurrent lock.
Thrown if the resource is a data URL and exceed the limit length defined by each browser.
|File API |
BCD tables only load in the browser