XMLHttpRequestUpload: error event

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is available in Web Workers, except for Service Workers.

The error event is fired when the request encountered an error.

Syntax

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

js
addEventListener("error", (event) => {});

onerror = (event) => {};

Event type

Event properties

In addition to the properties listed below, properties from the parent interface, Event, are available.

lengthComputable Read only

A boolean flag indicating if the total work to be done, and the amount of work already done, by the underlying process is calculable. In other words, it tells if the progress is measurable or not.

loaded Read only

A 64-bit unsigned integer value indicating the amount of work already performed by the underlying process. The ratio of work done can be calculated by dividing total by the value of this property. When downloading a resource using HTTP, this only counts the body of the HTTP message, and doesn't include headers and other overhead.

total Read only

A 64-bit unsigned integer representing the total amount of work that the underlying process is in the progress of performing. When downloading a resource using HTTP, this is the Content-Length (the size of the body of the message), and doesn't include the headers and other overhead.

Examples

Using the error event

You can use the error event to detect a problem with the upload. For a complete code example that uploads a file and displays a progress bar, see the main XMLHttpRequestUpload page.

js
// In case of an error we hide the progress bar
// Note that this event can be listened to on the xhr object too
function errorAction(event) {
  progressBar.classList.remove("visible");
  log.textContent = `Upload failed: ${event.type}`;
}
xhr.upload.addEventListener("error", errorAction);

Specifications

Specification
XMLHttpRequest
# event-xhr-error
XMLHttpRequest
# handler-xhr-onerror

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
error event

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also