This lib is a fork of the project preload-it.

A tiny 1kb JavaScript library for preloading assets on the browser via XHR2. It provides the ability to preload assets of different file types and composite progress events.

If you use npm, npm i preload-it-extended. Otherwise, download the latest release. The released bundle supports anonymous AMD, CommonJS, and vanilla environments. You can load directly from unpkg. For example:

<script src="https://unpkg.com/preload-it-extended@latest/dist/preload-it-extended.js"></script>

For the minified version:

<script src="https://unpkg.com/preload-it-extended"></script>

preload-it-extended is written using ES2015 modules. To import preload-it-extended into an ES2015 application, import into a namespace:

<script type="module">
  import preload from "https://unpkg.com/preload-it-extended@latest/dist/preload-it-extended.esm.min.js";
</script>

or

import Preload from "preload-it-extended";
const preload = Preload();

const preload = Preload();

preload
  .fetch([
    "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerEscapes.mp4",
    "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4",
    "https://images.pexels.com/photos/248797/pexels-photo-248797.jpeg"
  ])
  .then(items => {
    // use either a promise or 'oncomplete'
    console.log(items);
  });

preload.oncomplete = items => {
  console.log(items);
};

preload.onprogress = event => {
  console.log(event.progress + "%");
};

preload.onfetched = item => {
  console.log(item);
};

preload.onerror = item => {
  console.log(item);
};

Preloading of assets can be canceled at any time during fetching, when calling preload.cancel() all assets already preloaded will be available to use, however the download of pending assets will be abandoned, and status will be set to 0 for those remaining items.

preload.cancel();

preload.oncancel = items => {
  console.log(items);
};

Released for free under the MIT license, which means you can use it for almost any purpose (including commercial projects). We appreciate credit where possible, but it is not a requirement.

MIT.