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6.0.0-rc.33 • Public • Published


Datepicker element built with lit and Material Design 2021

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Version lit MIT License

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Miracle happens when marrying Material Design with date pickers on the web.

💯 Also, featured in awesome-lit-html.

This marks another completion of an important milestone of app-datepicker with all the love from the Web Components community in making this element great and wonderful. As Web Components getting more and more traction and better at providing a web standard way of creating shareable components, it plays an important role in the JavaScript community as many developers depend on a plethora of development tools written in JavaScript for the web to create a better developer experience when developing a library, a component, or even a large scalable application.


Today, app-datepicker has been completely rewritten to adapt to the best of both worlds by leveraging the modern technologies the community most familiar with since year 2018.

The following are the list of tools used that makes it shine:

  1. TypeScript
  2. lit

Table of contents


  • ES2019 (The element is compiled with features targeting ES2019, so it might not work properly without transpilation on older browsers.)
  • lit >= 2.2.0
  • [OPTIONAL] TypeScript >= 4.5.5 (TypeScript users only)


  • NPM

    $ npm i app-datepicker@next
  • Alternatively, it can be downloaded from any of the following awesome CDNs:

    1. jsdelivr

How to use


Please make sure you have all these features available on the browsers you are supporting. If no, please consider polyfill-ing in order to run the datepicker element.

The following snippet shows a simple script used in the demo to load polyfills via feature detection on different browsers:

  if (null == Array.prototype.find) {
    Object.defineProperty(Array.prototype, 'find', {
      value: function arrayFind(cb) {
        var filtered = this.filter(cb);
        return !filtered.length ? void 0 : filtered[0];

  if (!window.Intl) {
    var wa = document.createElement('script');
    /** NOTE: Pin package version due to */
    wa.src = '';
    wa.onload = function onLoad() {'🌐 Intl polyfill loaded'); };
    wa.onerror = console.error;

ES Modules


 * Say you've already installed the element via NPM, simply import the package to your application.
 * Here I'm using `lit` for developing my application.
import { css, html, LitElement } from 'lit';
import { customElement } from 'lit/decorators.js';
import 'app-datepicker';

const localName = 'my-app';

export class MyApp extends LitElement {
  static styles = [
    :host {
      display: block;

    * {
      box-sizing: border-box;

  render() {
    return html`<app-date-picker></app-date-picker>`;


<!doctype html>
  <!-- Using ES modules to load the app -->
  <script type="module" src="/my-app.js"></script>
      <!-- <AppDatepicker> will be rendered when <MyApp> loads. -->

Browser compatibility

All the elements work in last 2 versions of all evergreen browsers (Chrome/ Edge, Firefox, and Safari). Internet Explorer 11 is no longer supported in favor of the new Microsoft Edge.

Tested on the following browsers:

  1. Chrome/ Edge 100
  2. Firefox 96
  3. Safari 15.4

Not tested on the following browsers but it should work with all the polyfills needed:

  1. Edge 18 and below
  2. Safari 13.1 and below


  1. Does it work well with material-components-web-components?

    For material-components-web-components users, you can create your own custom date picker element by wrapping app-date-picker inside mwc-dialog.

    // Simplified code snippet
    class MWCDatePicker extends LitElement {
      render() {
        return html`
          <mwc-button slot="secondaryAction" dialogAction="cancel">cancel</mwc-button>
          <mwc-button slot="primaryAction" dialogAction="set">set</mwc-button>

API references


Older versions


MIT License © Rong Sen Ng


npm i app-datepicker@6.0.0-rc.33





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