promise-loading-spinner

Advanced handling of loaders/spinners based on one or multiple Promises.

Why?

• Show a spinner using a promise Spinner will disappear when promise is resolved
• No Spinner for short operations Spinner won't show up for short operations so operation doesn't feel lazy
• Support of multiple promises Spinner will disappear when the last unresolved promise is resolved
• Operations in a sequence If there are multiple operations in a sequence the spinner will disappear when the last operation is finished

See this Codepen.

Install

$ yarn add promise-loading-spinner

Usage

This shows loading spinners based on promises.

import PromiseLoadingSpinner from 'promise-loading-spinner';

const loader = new PromiseLoadingSpinner({
  // options
});

// ...

const myPromise = new Promise((resolve) => {
  setTimeout(() => {
    resolve('done');
  }, 5000);
});

loader.loader(myPromise);

You can also use a wrapper function for a function that returns a promise or uses await:

const myFunction = loader.wrapFunction(async (url) => {
  const response = await fetch(url);
  const result = await response.json();
  return result;
});

myFunction(someUrl);

It also exports a method decorator:

const loaderDecorator = loader.decorator.bind(loader);

class MyClass {
  @loaderDecorator()
  async foo() {
    // ...
  }
}

All ways to add a promise can also take a configuration object as an optional parameter.

Option	Description	Type
skipDelays	Skip all delays (initDelay, delay)	boolean

Examples:

// loader
loader(promise, { skipDelays: true });

// wrapFunction:
wrapFunction(fnc, { skipDelays: true });

// decorator:
class MyClass {
  @loaderDecorator({ skipDelays: true })
  async foo() {
    // ...
  }
}

Options

Option	Description	Type	Default
delay	Time (ms) until spinner will show up to handle short operations without a spinner	Number	300
closeDelay	Time (ms) to wait until last promise is resolved to enable multiple operations in a sequence without a "flickering" spinner	Number	10
initDelay	Delay (ms) after loader initialization to suppress spinners on page load	Number	1000
loaderElement	the element which represents the spinner	string (selector) or HTMLElement	js-page-loader
classActive	class name used to show the spinner	string	is-active

License

MIT © 2021 Jens Simon