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const $value = Symbol('value'); | |
class MyElement extends HTMLElement { | |
static get observedAttributes() { | |
return ['value']; | |
} | |
set value(value) { | |
this[$value] = value; | |
} | |
get value() { | |
return this[$value]; | |
} | |
attributeChangedCallback(attr, oldValue, newValue) { | |
if (oldValue !== newValue) { | |
this[attr] = newValue; | |
} | |
} | |
connectedCallback() { | |
// run stored value through setter | |
if (this.hasOwnProperty('value')) { | |
const value = this.value; | |
delete this.value; | |
this.value = value; | |
} | |
} | |
} | |
customElements.define('my-element', MyElement); |
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