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Rework attribute handling in Better

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This commit is contained in:
Talia 2021-08-03 16:32:19 +02:00
parent 73a6c6767d
commit 736f850dd7
1 changed files with 32 additions and 18 deletions
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50
better.js
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@ -34,11 +34,6 @@ export class Better extends HTMLElement {
if (this.#observer) this.#observer.observe(this, options)
}
attributeChangedCallback(attr, old, value) {
let name = attr.replace(/-([a-z])/, (_, l) => l.toUpperCase())
if (name+"Changed" in this) this[name+"Changed"](value, old)
}
// Array of connected callbacks
#connected = [];
@ -81,23 +76,42 @@ export class Better extends HTMLElement {
this.setContent(content)
}
attributeChangedCallback(attr, old, value) {
let name = attr.replace(/-([a-z])/, (_, l) => l.toUpperCase())
let attribute = this.constructor.attributes[name]
if (name+"Changed" in this)
if (typeof(attribute.get) == "function")
this[name+"Changed"](attribute.get.call(this, value), attribute.get.call(this, old))
else
this[name+"Changed"](value, old)
}
// Adds property/attribute mappings to the object.
static initialise(name = this.name) {
const names = Object
.getOwnPropertyNames(this.prototype)
.filter(name => name.search(/Changed$/)+1)
.map(name => name.replace(/Changed$/, ''))
.concat(this.properties ?? [])
const attributes = names.map(attr => attr.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase())
let attributes = this.attributes
? [...Object.keys(this.attributes)]
: []
/* See HTMLElement API */
Object.defineProperty(this, "observedAttributes", {
get() { return attributes }
get() { return attributes.map(attr => attr.replace(/[A-Z]/, u => "-"+u.toLowerCase())) }
})
names.forEach(name => {
let attr = name.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase()
Object.defineProperty(this.prototype, name, {
get() { return this.getAttribute(attr) },
set(val) { this.setAttribute(attr, val) }
})
attributes.forEach(name => {
let attribute = this.attributes[name]
let htmlName = name.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase()
let prop = {}
/* Is there a get filter? */
if (typeof attribute.get == "function")
prop.get = function() { return attribute.get.call(this, this.getAttribute(htmlName)) }
else
prop.get = function() { return this.getAttribute(htmlName) }
/* Is there a set filter? */
if (typeof attribute.set == "function")
prop.set = function(val) { return this.setAttribute(htmlName, attribute.set.call(this, val)) }
else if (attribute.set === false)
prop.set = function(val) { throw(`Attribute ${name} cannot be set`) }
else
prop.set = function(val) { this.setAttribute(htmlName, val) }
Object.defineProperty(this.prototype, name, prop)
})
name = name.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase()
if (this.extends)