https://github.com/chialab/dna

🧬 Progressive Web Components.
https://github.com/chialab/dna

custom-elements shadow-dom virtual-dom webcomponents

Last synced: 2 months ago
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🧬 Progressive Web Components.

• Host: GitHub
• URL: https://github.com/chialab/dna
• Owner: chialab
• License: mit
• Created: 2016-05-17T14:44:05.000Z (about 8 years ago)
• Default Branch: main
• Last Pushed: 2024-04-29T16:17:24.000Z (2 months ago)
• Last Synced: 2024-04-30T16:26:15.412Z (2 months ago)
• Topics: custom-elements, shadow-dom, virtual-dom, webcomponents
• Language: TypeScript
• Homepage: http://chialab.github.io/dna/
• Size: 10.1 MB
• Stars: 38
• Watchers: 6
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

Lists

• awesome-web-components - DNA - Progressive Web Components library. (Libraries / Class Based)

README

        


    

        

    





    DNA • Progressive Web Components





    



## Features

DNA aims to unleash the true power of [Custom Elements](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_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**](https://chialab.github.io/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  even inside buttons.

## Get the library

Install via NPM:

```

npm i @chialab/dna@alpha

```

```

yarn add @chialab/dna@alpha

```

## Define a Component

```tsx

import { Component, customElement, listen, property } from '@chialab/dna';

@customElement('hello-world')

class HelloWorld extends Component {

    // define an observed property

    @property() name: string = '';

    render() {

        return (

            <>

                

                
Hello {this.name || 'World'}!

            >

        );

    }


    // 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:

```html

```

## Development

[![Build status](https://github.com/chialab/dna/workflows/Main/badge.svg)](https://github.com/chialab/dna/actions?query=workflow%3AMain)

[![codecov](https://codecov.io/gh/chialab/dna/branch/main/graph/badge.svg)](https://codecov.io/gh/chialab/dna)

### 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](https://github.com/chialab/dna/blob/main/LICENSE) license.