Replace bind function with proper reactivity
* Detects state elements * Two-Way binding for supported attributes
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137
skooma.js
137
skooma.js
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@ -31,7 +31,6 @@ const parseAttribute = (attribute) => {
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return JSON.stringify(attribute)
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}
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const defined = (value, fallback) => typeof value != "undefined" ? value : fallback
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const getCustom = args => args.reduce(
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(current, argument) => Array.isArray(argument)
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@ -42,36 +41,113 @@ const getCustom = args => args.reduce(
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,undefined
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)
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const isReactive = object => object
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&& (typeof object == "object")
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&& ("addEventListener" in object)
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&& ("value" in object)
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const toChild = arg => {
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if (typeof arg == "string" || typeof arg == "number") {
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return document.createTextNode(arg)
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} else if ("nodeName" in arg) {
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return arg
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} else if (isReactive(arg)) {
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return reactiveChild(arg)
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}
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}
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const reactiveChild = reactive => {
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const ref = new WeakRef(toChild(reactive.value))
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reactive.addEventListener("change", () => {
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const value = ref.deref()
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if (value)
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value.replaceWith(reactiveChild(reactive))
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}, {once: true})
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return ref.deref()
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}
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const specialAttributes = {
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value: {
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get: element => element.value,
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set: (element, value) => {
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element.setAttribute("value", value)
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element.value = value
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},
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hook: (element, callback) => { element.addEventListener("input", callback) }
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},
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style: {
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set: (element, value) => { insertStyles(element.style, value) }
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},
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dataset: {
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set: (element, value) => {
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for (const [attribute2, value2] of Object.entries(value)) {
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element.dataset[attribute2] = parseAttribute(value2)
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}
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}
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},
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shadowRoot: {
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set: (element, value) => {
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parseArgs((element.shadowRoot || element.attachShadow({mode: "open"})), null, value)
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}
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}
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}
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const setAttribute = (element, attribute, value, cleanupSignal) => {
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const special = specialAttributes[attribute]
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if (isReactive(value))
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setReactiveAttribute(element, attribute, value)
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else if (typeof value === "function")
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element.addEventListener(attribute.replace(/^on[A-Z]/, x => x.charAt(x.length-1).toLowerCase()), value, {signal: cleanupSignal})
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else if (special) {
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special.set(element, value)
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}
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else if (value === true)
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{if (!element.hasAttribute(attribute)) element.setAttribute(attribute, '')}
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else if (value === false)
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element.removeAttribute(attribute)
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else {
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element.setAttribute(attribute, parseAttribute(value))
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}
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}
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const setReactiveAttribute = (element, attribute, reactive, abortController) => {
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if (abortController) abortController.abort()
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abortController = new AbortController()
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const ref = new WeakRef(element)
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setAttribute(element, attribute, reactive.value, abortController.signal)
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reactive.addEventListener("change", () => {
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const element = ref.deref()
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if (element)
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setReactiveAttribute(element, attribute, reactive, abortController)
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}, {once: true})
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const special = specialAttributes[attribute]
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if (special?.hook) {
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special.hook(element, () => {
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const value = special.get(element, attribute)
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if (value != reactive.value) reactive.value = value
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})
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}
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}
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const parseArgs = (element, before, ...args) => {
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if (element.content) element = element.content
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for (const arg of args) if (arg !== empty)
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if (typeof arg == "string" || typeof arg == "number")
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element.insertBefore(document.createTextNode(arg), before)
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for (const arg of args) if (arg !== empty) {
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const child = toChild(arg)
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if (child)
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element.insertBefore(child, before)
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else if (arg === undefined || arg == null)
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console.warn(`An argument of type ${typeof arg} has been ignored`, element)
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else if (typeof arg == "function")
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arg(element)
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else if ("nodeName" in arg)
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element.insertBefore(arg, before)
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else if ("length" in arg)
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parseArgs(element, before, ...arg)
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else
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for (const key in arg)
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if (key == "style" && typeof(arg[key])=="object")
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insertStyles(element.style, arg[key])
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else if (key == "dataset" && typeof(arg[key])=="object")
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for (const [key2, value] of Object.entries(arg[key]))
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element.dataset[key2] = parseAttribute(value)
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else if (key == "shadowRoot")
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parseArgs((element.shadowRoot || element.attachShadow({mode: "open"})), null, arg[key])
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else if (typeof arg[key] === "function")
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element.addEventListener(key.replace(/^on[A-Z]/, x => x.charAt(x.length-1).toLowerCase()), arg[key])
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else if (arg[key] === true)
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{if (!element.hasAttribute(key)) element.setAttribute(key, '')}
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else if (arg[key] === false)
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element.removeAttribute(key)
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else
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element.setAttribute(key, parseAttribute(arg[key]))
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setAttribute(element, key, arg[key])
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}
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}
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const node = (name, args, options) => {
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@ -98,25 +174,6 @@ export const svg = nameSpacedProxy({xmlns: "http://www.w3.org/2000/svg"})
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// Other utility exports
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export const bind = transform => {
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let element
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const inject = next => Object.defineProperty(next, 'current', {get: () => element})
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const update = (...data) => {
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const next = transform(...data)
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if (next) {
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if (typeof next == "string") {
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element.innerText = next
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return element
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} else {
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if (element) element.replaceWith(next)
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element = inject(next)
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return element
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}
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}
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}
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return update
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}
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// Wraps an event handler in a function that calls preventDefault on the event
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export const handle = fn => event => { fn(event); event.preventDefault() }
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