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index.mjs
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index.mjs
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import morph from './morph.mjs'
export default function enhance(tagName, opts) {
const shadow = opts.shadow
const _observedAttributes = opts.observedAttributes ||
opts.attrs
delete opts.observedAttributes
delete opts.attrs
const _adoptedCallback = opts.adoptedCallback ||
opts.adopted
delete opts.adoptedCallback
delete opts.adopted
const _connectedCallback = opts.connectedCallback ||
opts.connected
delete opts.connectedCallback
delete opts.connected
const _disconnectedCallback = opts.disconnectedCallback ||
opts.disconnected
delete opts.disconnectedCallback
delete opts.disconnected
class EnhanceElement extends HTMLElement {
constructor() {
super()
Object.keys(opts)
.map(k => Object.defineProperty(this, k, {
value: opts[k],
writable: false
})
)
if (shadow) {
this.shadowMode = shadow
}
const templateName = `${this.tagName.toLowerCase()}-template`
const template = document.getElementById(templateName)
if (template) {
this.template = template
}
else {
this.template = document.createElement('template')
this.template.innerHTML = this.render({
html:this.html,
state:{ attrs:{}, store:{} }
})
this.template.setAttribute('id', templateName)
}
this.shadowMode
? this.attachShadow({ mode: this.shadowMode || 'open' })
.appendChild(this.template.content.cloneNode(true))
: this.replaceChildren(
this.template.content.cloneNode(true))
this.store = {}
this.init && this.init(this)
}
static get observedAttributes() {
return _observedAttributes
}
adoptedCallback() {
if(typeof _adoptedCallback === 'function') {
_adoptedCallback.call(this)
}
}
connectedCallback() {
if (this.isConnected && typeof _connectedCallback === 'function') {
_connectedCallback.call(this)
}
}
disconnectedCallback() {
if(typeof _disconnectedCallback === 'function') {
_disconnectedCallback.call(this)
}
}
attributeChangedCallback(name, oldValue, newValue) {
if (oldValue !== newValue) {
this.#process()
}
}
html(strings, ...values) {
const collect = []
for (let i = 0; i < strings.length - 1; i++) {
collect.push(strings[i], values[i])
}
collect.push(strings[strings.length - 1])
return collect.join('')
}
get #state() {
const attrs = this.attributes.length
? this.attrsToObject(this.attributes)
: {}
const store = this.store
return {
attrs,
store
}
}
attrsToObject(attrs=[]) {
const attrsObj = {}
for (let d = attrs.length - 1; d >= 0; d--) {
let attr = attrs[d]
attrsObj[attr.nodeName] = attr.nodeValue
}
return attrsObj
}
#process() {
const tmp = this.render({
html:this.html,
state:this.#state
})
const updated = document.createElement('div')
updated.innerHTML = tmp.trim()
morph(
this,
updated,
{
childrenOnly: true
}
)
}
}
customElements.define(
tagName,
EnhanceElement
)
}