XMLHttpRequestEventTarget

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.

XMLHttpRequestEventTarget is the interface that describes the event handlers shared on XMLHttpRequest and XMLHttpRequestUpload.

You don't use XMLHttpRequestEventTarget directly; instead you interact with the sub classes.

Events

The following events are made available to XMLHttpRequest and XMLHttpRequestUpload:

abort: Fired when a request has been aborted, for example because the program called XMLHttpRequest.abort(). Also available via the onabort event handler property.
error: Fired when the request encountered an error. Also available via the onerror event handler property.
load: Fired when a request transaction completes successfully. Also available via the onload event handler property.
loadend: Fired when a request has completed, whether successfully (after load) or unsuccessfully (after abort or error). Also available via the onloadend event handler property.
loadstart: Fired when a request has started to load data. Also available via the onloadstart event handler property.
progress: Fired periodically when a request receives more data. Also available via the onprogress event handler property.
timeout: Fired when progress is terminated due to preset time expiring. Also available via the ontimeout event handler property.