CancelablePromise

A promise you can stop.

Installation

In Browser

Include assets

Simply download and include with a script tag, CancelablePromise will be registered as a global variable.

<script src="../lib/cancelable-promise.global.js"></script>

<script>
  var promise = new CancelablePromise((resolve, reject, onCancel) => {
    setTimeout(resolve, 1000);
    onCancel(() => console.log('canceled'));
  });
  promise.cancel();
</script>

CDN

unpkg

<script src="https://unpkg.com/@nextgis/cancelable-promise"></script>

jsdelivr

<script src="https://cdn.jsdelivr.net/npm/@nextgis/cancelable-promise"></script>

We recommend linking to a specific version number /cancelable-promise@[version]

In Node.js

npm install @nextgis/cancelable-promise

Usage

Catch CancelError

import CancelablePromise from "@nextgis/cancelable-promise";

const promise = new CancelablePromise((resolve, reject) => {
  setTimeout(() => resolve(), 100);
}).catch((er) => {
  if (er.name === "CancelError") {
    // handle cancel error
  }
  throw er;
});

promise.cancel();

Handle onCancel callback

import CancelablePromise from "@nextgis/cancelable-promise";

const promise = new CancelablePromise((resolve, reject, onCancel) => {
  const xhr = new XMLHttpRequest();
  xhr.open("GET", url, true);
  xhr.onload = () => {
    resolve(xhr.responseText);
  };
  xhr.onerror = (er) => {
    reject(er);
  };

  onCancel(() => {
    xhr.abort();
  });

  xhr.send();
});

promise.cancel();

Check out the API Documentation

Commercial support

Need to fix a bug or add a feature to @nextgis/cancelable-promise? We provide custom development and support for this software. Contact us to discuss options!