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August 15, 2019 20:58
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Trying out web components
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| class HelloThing extends HTMLElement { | |
| static get observedAttributes () { | |
| return ['thing'] | |
| } | |
| constructor () { | |
| super() | |
| this.attachShadow({ mode: 'open' }) | |
| this.render() | |
| } | |
| get thing () { | |
| return this.getAttribute('thing') | |
| } | |
| set thing (value) { | |
| this.setAttribute('thing', value) | |
| } | |
| render () { | |
| const template = document.createElement('template') | |
| template.innerHTML = ` | |
| <style> | |
| :host { | |
| color: darkgreen; | |
| } | |
| </style> | |
| <h1>Hello | |
| <span id="thing">${this.thing}</span> | |
| </h1> | |
| ` | |
| this.shadowRoot.appendChild(template.content.cloneNode(true)) | |
| } | |
| attributeChangedCallback (name, oldValue, newValue) { | |
| this.shadowRoot.getElementById(name).innerText = newValue | |
| } | |
| } | |
| customElements.define('hello-thing', HelloThing) |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script type="module" src="hello-thing.js"></script> | |
| </head> | |
| <body> | |
| <hello-thing thing="World"></hello-thing> | |
| <input id="thing" type="text" value="World" /> | |
| <button id="set-thing" type="submit">Set Thing</button> | |
| <script type="module"> | |
| const button = document.querySelector('#set-thing') | |
| const element = document.querySelector('hello-thing') | |
| const input = document.querySelector('#thing') | |
| button.onclick = () => element.thing = input.value | |
| </script> | |
| </body> | |
| </html> |
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