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Add DjlSpinner element

This commit is contained in:
Dylan Lom 2021-05-27 21:38:13 +10:00
parent 81322e81a2
commit 993d7bed36
2 changed files with 76 additions and 3 deletions
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64
DjlSpinner.js Normal file
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@ -0,0 +1,64 @@
const getSpinnerCss = ({background, foreground, size}) => {
return `
@keyframes __spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
.loader {
display: inline-block;
vertical-align: top;
margin: 0 0.25em;
border: ${size * 0.2}px solid ${background};
border-top: ${size * 0.2}px solid ${foreground};
border-radius: 50%;
width: ${size}px;
height: ${size}px;
animation: __spin 2s linear infinite;
}`
}
/**
* Loading spinner
* @attribute background - background color of the spinner
* @attribute foreground - foreground color of the spinner
* @attribute size - size of the spinner in pixels
*/
// TODO: Accept other size formats (ie. %, vh)
// TODO: Use style attribute instead...?
class DjlSpinner extends HTMLElement {
shadow // ShadowRoot
spinner // HTMLDivElement
style // HTMLStyleElement
static get observedAttributes() {
return ['background', 'foreground', 'size']
}
constructor() {
super()
this.shadow = this.attachShadow({ mode: 'open' })
this.spinner = document.createElement('div')
this.spinner.classList.add('loader')
this.style = document.createElement('style')
this.style.innerHTML = getSpinnerCss(this.props())
this.shadow.appendChild(this.style)
this.shadow.appendChild(this.spinner)
}
props = () => ({
background: this.getAttribute('background') || '#eee',
foreground: this.getAttribute('foreground') || '#333',
size: parseInt(this.getAttribute('size')) || 20,
})
attributeChangedCallback() {
this.style.innerHTML = getSpinnerCss(this.props())
}
}
customElements.define('djl-spinner', DjlSpinner)

15
example.html
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@ -8,6 +8,7 @@
<script defer src="DjlJson.js"></script>
<script defer src="DjlLipsum.js"></script>
<script defer src="DjlScript.js"></script>
<script defer src="DjlSpinner.js"></script>
</head>
<body>
@ -39,12 +40,20 @@
<p><djl-script>`Happy ${['Sun', 'Mon', 'Tues', 'Wednes', 'Thurs', 'Fri', 'Satur'][new Date().getDay()]}day`</djl-script></p>
</article>
<article id="djl-spinner">
<p>Loading spinners!</p>
<p><djl-spinner /></p>
<p>Customize <code>size</code>, <code>background</code> and <code>foreground</code> colours</p>
<p><djl-spinner size="25px" background="green" foreground="cyan"></djl-spinner></p>
</article>
<article id="djl-json">
<p>Below are some examples of the djl-json element. It retrieves a JSON document from <code>src</code>, and displays the property <code>prop</code></p>
<p>My name in example.json is: <djl-json src="example.json" prop="about.name">loading...</djl-json></p>
<p>My pets are called: <djl-json src="example.json" prop="about.pets">loading...</djl-json></p>
</article>
<p>My pets are called:
<djl-json src="example.json" prop="about.pets"></djl-json>
</p>
<p>My name in example.json is: <djl-json src="example.json" prop="about.name"><code>loading...</code></djl-json></p>
<p>Stick a spinner inside to let people know you're getting something!<djl-json src="example.json" prop="about.dob"><djl-spinner/></djl-json> (you may need to throttle your network if running this locally)</p>
</article>
</body>
</html>