Created
June 14, 2019 13:14
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custom element
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8" /> | |
<title>webcomponents test</title> | |
<link | |
href="data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQEAYAAABPYyMiAAAABmJLR0T///////8JWPfcAAAACXBIWXMAAABIAAAASABGyWs+AAAAF0lEQVRIx2NgGAWjYBSMglEwCkbBSAcACBAAAeaR9cIAAAAASUVORK5CYII=" | |
rel="icon" | |
type="image/x-icon" | |
/> | |
<style> | |
ui-tab-toggle { | |
border: 1px solid #222; | |
} | |
ui-tab-toggle a { | |
text-decoration: none; | |
display: inline-block; | |
padding: 2px 4px; | |
} | |
ui-tab-toggle .selected { | |
color: red; | |
font-weight: bold; | |
} | |
ui-tab-content { | |
display: block; | |
border: 1px solid gray; | |
} | |
</style> | |
</head> | |
<body> | |
<script> | |
class UiTabToggle extends HTMLElement { | |
update(idx) { | |
const els = Array.prototype.slice.apply(this.children); | |
els.forEach((el, i) => { | |
el.className = idx === i ? 'selected' : ''; | |
}); | |
const contentEl = this.parentNode.querySelector('ui-tab-content'); | |
contentEl && contentEl.setAttribute('chosen', idx); | |
} | |
connectedCallback() { | |
const items = this.getAttribute('data').split(','); | |
items.forEach((it, idx) => { | |
const aEl = document.createElement('a'); | |
aEl.setAttribute('href', '#' + idx); | |
aEl.appendChild(document.createTextNode(it)); | |
this.appendChild(aEl); | |
}); | |
this.addEventListener('click', (ev) => { | |
ev.preventDefault(); | |
ev.stopPropagation(); | |
const el = ev.target; | |
const idx = parseInt(el.getAttribute('href').substring(1), 10); | |
this.update(idx); | |
}); | |
this.update(0); | |
} | |
} | |
customElements.define('ui-tab-toggle', UiTabToggle); | |
class UiTabContent extends HTMLElement { | |
static get observedAttributes() { | |
return ['chosen']; | |
} | |
get chosen() { | |
return parseInt(this.getAttribute('chosen'), 10); | |
} | |
set chosen(idx) { | |
this.setAttribute('chosen', idx); | |
} | |
update() { | |
let idx = this.chosen; | |
//console.log('update', idx); | |
if (isNaN(idx)) { | |
idx = 0; | |
} | |
const els = Array.prototype.slice.apply(this.children); | |
els.forEach((el, i) => { | |
el.style.display = idx === i ? '' : 'none'; | |
}); | |
} | |
connectedCallback() { | |
this.update(); | |
} | |
attributeChangedCallback(attr, v0, v1) { | |
if (attr === 'chosen' && this.isConnected) { | |
this.update(); | |
} | |
} | |
} | |
customElements.define('ui-tab-content', UiTabContent); | |
</script> | |
<ui-tab-toggle data="A,B"></ui-tab-toggle> | |
<ui-tab-content> | |
<div>ONE</div> | |
<div>TWO</div> | |
</ui-tab> | |
</body> | |
</html> |
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