A module for creating Web Components.

Install

npm i @neumatter/webc

Getting Started

import * as webC from '@neumatter/webc'

class ThemeButton extends webC.WebComponent {
  constructor () {
    // always call super first
    super()

    const theme = localStorage.getItem('data-theme')
    const { matches: prefersDark } = matchMedia('(prefers-color-scheme: dark)')

    // the context that will be used to alter element
    this.context.dark = 'bi-sun-fill'
    this.context.light = 'bi-moon-fill'

    // set the theme state if found in storage or prefersDarkMode
    this.state.theme = theme ? theme : prefersDark ? 'dark' : 'light'
    // use the state.theme as the key to get context and set state.themeClass
    this.state.themeClass = this.context[this.state.theme]
  }

  // render will be called on load and state changes
  // renders the doc
  render () {
    const root = document.documentElement
    const { theme } = this.state
    root.setAttribute('data-theme', theme)
    localStorage.setItem('data-theme', theme)

    return `
        <i id="btni" class="bi ${this.state.themeClass}"></i>
      `
  }

  // on['Event'] - adds eventListener
  onClick = () => {
    // change the theme
    const theme = this.state.theme === 'dark' ? 'light' : 'dark'
    // setState
    this.setState({
      theme,
      themeClass: this.getContext(theme)
    })
  }
}

webC.define('theme-button', ThemeButton)