Created
January 4, 2019 12:17
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Lazy Choo component using split-require
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| var Choo = require('choo') | |
| var html = require('choo/html') | |
| var LazyColor = require('./lazy-color') | |
| var app = new Choo() | |
| app.use(store) | |
| app.route('/', view) | |
| app.mount('body') | |
| function view (state, emit) { | |
| return html` | |
| <body> | |
| <select onselect=${onselect}> | |
| <option disabled>Pick a color</option> | |
| <option selected=${state.color === 'blue'}>blue</option> | |
| <option selected=${state.color === 'pink'}>pink</option> | |
| <option selected=${state.color === 'red'}>red</option> | |
| </select> | |
| ${state.color ? state.cache(LazyColor, state.color) : null} | |
| </body> | |
| ` | |
| function onselect (event) { | |
| emit('color', event.target.value) | |
| } | |
| } | |
| function store (state, emitter) { | |
| state.color = null | |
| emitter.on('color', function (color) { | |
| state.color = color | |
| emitter.emit('render') | |
| }) | |
| } |
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| var Component = require('choo/component') | |
| var splitRequire = require('split-require') | |
| var colors = { | |
| 'blue': () => splitRequire('./blue'), | |
| 'pink': () => splitRequire('./pink'), | |
| 'red': () => splitRequire('./red') | |
| } | |
| module.exports = class LazyColor extends Component { | |
| constructor (id, state, emit, color) { | |
| super(id) | |
| this.emit = emit | |
| this.component = null | |
| this.local = state.components[id] = { | |
| color: color, | |
| id: id | |
| } | |
| } | |
| update () { | |
| reutrn true | |
| } | |
| load () { | |
| this.emit('loading', this.local.color) | |
| var load = colors[this.local.color] | |
| load().then((Color) => { | |
| this.component = new Color() | |
| this.emit('loaded', this.local.color) | |
| this.rerender() | |
| }) | |
| } | |
| createElement (...args) { | |
| if (!this.component) return html`<span>Loading…</span>` | |
| return this.component.render(...args) | |
| } | |
| } |
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