Awesome
<p align="center"> <a href="https://chialab.github.io/dna/"> <img alt="DNA logo" width="144" height="144" src="https://raw.githack.com/chialab/dna/main/logo.svg" /> </a> </p> <p align="center"> <strong>DNA</strong> • Progressive Web Components </p> <p align="center"> <a href="https://www.npmjs.com/package/@chialab/dna"><img alt="NPM" src="https://img.shields.io/npm/v/@chialab/dna.svg"></a> </p>Features
DNA aims to unleash the true power of Custom Elements through a declarative definition API, with builtin elements extension support and a simpler composition mechanism (yes, it does not use ShadowDOM).
Customized built-in elements
DNA simplifies and encourages the use of customized built-in elements, which inherit methods and properties from standard HTML, preserving usability and accessibility features.
Properties, states and attributes
DNA offers @property
and @state
decorators for adding reactivity to a component's class fields, ensuring that any changes are reflected in the component's template. These properties and states can be monitored, synchronized with attributes, and trigger change events.
Listeners and async events
DNA uses event delegation for listening to events from a component's elements or slotted contents, offering the @listen
decorator to streamline the process. Events can be asynchronous and dispatched from the component's class.
Slots
DNA uses Quantum instead of ShadowDOM to render slotted children, simplifying the usage of custom elements inside forms and providing a more flexible management of slotted contents. Unlike ShadowDOM, Quantum also works for built-in elements, allowing you to use <slot> even inside buttons.
Get the library
Install via NPM:
npm i @chialab/dna
yarn add @chialab/dna
Define a Component
import { Component, customElement, listen, property } from '@chialab/dna';
@customElement('hello-world')
class HelloWorld extends Component {
// define an observed property
@property() name: string = '';
render() {
return (
<>
<input
name="firstName"
value={this.name}
/>
<h1>Hello {this.name || 'World'}!</h1>
</>
);
}
// delegate an event
@listen('change', 'input[name="firstName"]')
private onChange(event: Event, target: HTMLInputElement) {
this.name = target.value;
}
}
Then use the element in your HTML:
<hello-world></hello-world>
Development
Build the project
Install the dependencies and run the build
script:
yarn install
yarn build
This will generate the bundles in the dist
folder, as well as the declaration files.
Test the project
Run the test
script:
yarn test
License
DNA is released under the MIT license.