Created
August 28, 2017 15:28
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'ticker' experiment over test by @kenchris
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<html> | |
<script type="module"> | |
import { html, render } from './lit-html.min.js'; | |
class MyGreater extends HTMLElement { | |
static get observedAttributes() { return ['data-names']; } | |
constructor() { | |
super(); | |
this.attachShadow({mode: 'open'}); | |
this._names = null; | |
this._count = 0; | |
} | |
attributeChangedCallback(attr, oldValue, newValue) { | |
console.log(attr); | |
if (attr == 'data-names') { | |
this._names = newValue.split(','); | |
this._count = 0; | |
this.invalidate(); | |
} | |
} | |
render() { | |
if(this._count >= this._names.length) | |
this._count = 0; | |
return html` | |
Hi <b>${this._names ? this._names[this._count++] : "some body"}</b> | |
`; | |
} | |
connectedCallback() { | |
this.invalidate(); | |
setInterval(this.invalidate.bind(this), 1000); | |
} | |
invalidate() { | |
if (!this.needsRender) { | |
this.needsRender = true; | |
Promise.resolve().then(() => { | |
this.needsRender = false; | |
render(this.render(), this.shadowRoot); | |
}); | |
} | |
} | |
} | |
class FancyGreater extends HTMLElement { | |
constructor() { | |
super(); | |
this.attachShadow({mode: 'open'}); | |
} | |
render() { | |
return html` | |
<style> | |
div { | |
background-color: green; | |
} | |
</style> | |
<div> | |
<my-greeter data-names="fancy-pancy,happy,joy,dance"></my-greeter> | |
</div> | |
`; | |
} | |
connectedCallback() { | |
this.invalidate(); | |
} | |
invalidate() { | |
if (!this.needsRender) { | |
this.needsRender = true; | |
Promise.resolve().then(() => { | |
this.needsRender = false; | |
render(this.render(), this.shadowRoot); | |
}); | |
} | |
} | |
} | |
customElements.define('my-greeter', MyGreater); | |
customElements.define('fancy-greeter', FancyGreater); | |
</script> | |
<body> | |
<my-greeter data-names="Kenneth">Hi someone</my-greeter> | |
<br> | |
<fancy-greeter></fancy-greeter> | |
</body> | |
</html> |
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