AbortController: AbortController() constructor

The AbortController() constructor creates a new AbortController object instance.

Syntax

js

new AbortController()

Parameters

None.

Examples

In the following snippet, we aim to download a video using the Fetch API.

We first create a controller using the AbortController() constructor, then grab a reference to its associated AbortSignal object using the AbortController.signal property.

When the fetch request is initiated, we pass in the AbortSignal as an option inside the request's options object (the { signal } below). This associates the signal and controller with the fetch request and allows us to abort it by calling AbortController.abort(), as seen below in the second event listener.

js

const controller = new AbortController();
const signal = controller.signal;

const url = "video.mp4";
const downloadBtn = document.querySelector(".download");
const abortBtn = document.querySelector(".abort");

downloadBtn.addEventListener("click", fetchVideo);

abortBtn.addEventListener("click", () => {
  controller.abort();
  console.log("Download aborted");
});

function fetchVideo() {
  fetch(url, { signal })
    .then((response) => {
      console.log("Download complete", response);
    })
    .catch((err) => {
      console.error(`Download error: ${err.message}`);
    });
}

Note: When abort() is called, the fetch() promise rejects with an AbortError.

You can find a full working example on GitHub; you can also see it running live.

Specifications

Specification
DOM Standard
# ref-for-dom-abortcontroller-abortcontroller①

Browser compatibility

BCD tables only load in the browser

See also