IDBFileRequest: progress event

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: The three non-standard interfaces IDBMutableFile, IDBFileHandle, and IDBFileRequest are disabled by default. Consider using the File and Directory Entries API instead.

The progress is fired periodically when the request in progress.

This event is not cancelable and does not bubble.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener('complete', event => { });
onerror = complete => { };

Event type

A Event with two extra properties:

loaded

A number representing the current amount of bytes processed by the operation.

total

A number representing the total amount of bytes that will be processed by the operation.

Examples

// Assuming 'request' which is an IDBFileRequest object

request.onprogress = function (status) {
  const progress = document.querySelector('progress');

  progress.value = status.loaded;
  progress.max   = status.total;
}

Specifications

Not part of any current specification.

Browser compatibility

This event is not supported by any current browser. From Firefox 102 it is behind the preference dom.fileHandle.enabled.

See also