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<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><meta name="description" content="Using not only events in UI declaratively."><title>`deka-dom-el` — Events and Addons</title><!--<dde:mark type="component" name="metaAuthor" host="this" ssr/>--><meta name="author" content="Jan Andrle"><link type="text/plain" rel="author" href="https://jaandrle.github.io/humans.txt"><meta name="generator" content="deka-dom-el"><!--<dde:mark type="component" name="metaTwitter" host="this" ssr/>--><meta name="twitter:card" content="summary_large_image"><meta name="twitter:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="twitter:title" content="deka-dom-el"><meta name="twitter:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="twitter:creator" content="@jaandrle"><!--<dde:mark type="component" name="metaFacebook" host="this" ssr/>--><meta name="og:url" content="https://github.com/jaandrle/deka-dom-el"><meta name="og:title" content="deka-dom-el"><meta name="og:description" content="A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks."><meta name="og:creator" content="@jaandrle"><script src="https://cdn.jsdelivr.net/npm/shiki@0.9" defer=""></script><script type="module" src="code.js.js"></script><script src="https://flems.io/flems.html" type="text/javascript" charset="utf-8"></script><link rel="stylesheet" href="global.css"></head><body><!--<dde:mark type="component" name="page" host="this" ssr/>--><!--<dde:mark type="component" name="simplePage" host="this" ssr/>--><!--<dde:mark type="component" name="header" host="this" ssr/>--><header><h1>`deka-dom-el` — Events and Addons</h1><p>Using not only events in UI declaratively.</p></header><nav><a href="https://github.com/jaandrle/deka-dom-el"><svg class="icon" viewBox="0 0 32 32"><!--<dde:mark type="component" name="iconGitHub" host="parentElement" ssr/>--><path d="M 16,0.395c -8.836,0 -16,7.163 -16,16c 0,7.069 4.585,13.067 10.942,15.182c 0.8,0.148 1.094,-0.347 1.094,-0.77c 0,-0.381 -0.015,-1.642 -0.022,-2.979c -4.452,0.968 -5.391,-1.888 -5.391,-1.888c -0.728,-1.849 -1.776,-2.341 -1.776,-2.341c -1.452,-0.993 0.11,-0.973 0.11,-0.973c 1.606,0.113 2.452,1.649 2.452,1.649c 1.427,2.446 3.743,1.739 4.656,1.33c 0.143,-1.034 0.558,-1.74 1.016,-2.14c -3.554,-0.404 -7.29,-1.777 -7.29,-7.907c 0,-1.747 0.625,-3.174 1.649,-4.295c -0.166,-0.403 -0.714,-2.03 0.155,-4.234c 0,0 1.344,-0.43 4.401,1.64c 1.276,-0.355 2.645,-0.532 4.005,-0.539c 1.359,0.006 2.729,0.184 4.008,0.539c 3.054,-2.07 4.395,-1.64 4.395,-1.64c 0.871,2.204 0.323,3.831 0.157,4.234c 1.026,1.12 1.647,2.548 1.647,4.295c 0,6.145 -3.743,7.498 -7.306,7.895c 0.574,0.497 1.085,1.47 1.085,2.963c 0,2.141 -0.019,3.864 -0.019,4.391c 0,0.426 0.288,0.925 1.099,0.768c 6.354,-2.118 10.933,-8.113 10.933,-15.18c 0,-8.837 -7.164,-16 -16,-16Z"></path></svg>GitHub</a><a href="./" title="Introducing a&nbsp;library.">1. Introduction</a><a href="p02-elements" title="Basic concepts of elements modifications and creations.">2. Elements</a><a href="p03-events" title="Using not only events in UI declaratively." class="current">3. Events and Addons</a><a href="p04-observables" title="Handling reactivity in UI via observables.">4. Observables and reactivity</a><a href="p05-scopes" title="Organizing UI into components">5. Scopes and components</a><a href="p06-customElement" title="Using custom elements in combinantion with DDE">6. Custom elements</a></nav><main><h2>Listenning to the native DOM events and other Addons</h2><p>We quickly introduce helper to listening to the native DOM events. And library syntax/pattern so-called <em>Addon</em> to incorporate not only this in UI templates declaratively.</p><div class="code" data-js="todo"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">// use NPM or for example https://cdn.jsdelivr.net/gh/jaandrle/deka-dom-el/dist/esm.js
import { on, dispatchEvent } from "deka-dom-el";
/** @type {ddeElementAddon} */
</code></div><h3 id="h-events-and-listenners"><!--<dde:mark type="component" name="h3" host="parentElement" ssr/>--><a href="#h-events-and-listenners" tabindex="-1">#</a> Events and listenners</h3><p>In JavaScript you can listen to the native DOM events of the given element by using <a href="https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener" title="addEventListener on MDN"><code>element.addEventListener(type, listener, options)</code></a>. The library provides an alternative (<code>on</code>) accepting the differen order of the arguments:</p><!--<dde:mark type="component" name="example" host="this" ssr/>--><div id="code-example-1-1wmddlo83w68" class="example"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">import { el, on } from "./esm-with-observables.js";
const log= mark=&gt; console.log.bind(console, mark);
const button= el("button", "Test click");
button.addEventListener("click", log("`addEventListener`"), { once: true });
on("click", log("`on`"), { once: true })(button);
document.body.append(
button
);
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(r.dispatchEvent(new Event(y)), r) : (q(e.signal, () => D.offConnected(r, t)) && D.onConnected(r, t), r);\\n\\t};\\n};\\nO.disconnected = function(t, e) {\\n\\treturn e = st(e), function(r) {\\n\\t\\treturn r.addEventListener(S, t, e), r[C] || q(e.signal, () => D.offDisconnected(r, t)) && D.onDisconnected(r, t), r;\\n\\t};\\n};\\nvar Z = /* @__PURE__ */ new WeakMap();\\nO.disconnectedAsAbort = function(t) {\\n\\tif (Z.has(t))\\n\\t\\treturn Z.get(t);\\n\\tlet e = new AbortController();\\n\\treturn Z.set(t, e), t(O.disconnected(() => e.abort())), e;\\n};\\nvar _t = /* @__PURE__ */ new WeakSet();\\nO.attributeChanged = function(t, e) {\\n\\treturn typeof e != \\\"object\\\" && (e = {}), function(r) {\\n\\t\\tif (r.addEventListener(P, t, e), r[C] || _t.has(r) || !d.M)\\n\\t\\t\\treturn r;\\n\\t\\tlet o = new d.M(function(s) {\\n\\t\\t\\tfor (let { attributeName: a, target: h } of s)\\n\\t\\t\\t\\th.dispatchEvent(\\n\\t\\t\\t\\t\\tnew CustomEvent(P, { detail: [a, h.getAttribute(a)] })\\n\\t\\t\\t\\t);\\n\\t\\t});\\n\\t\\treturn q(e.signal, () => o.disconnect()) && o.observe(r, { attributes: !0 }), r;\\n\\t};\\n};\\n\\n// src/observables-lib.js\\nvar p = \\\"__dde_observable\\\";\\nfunction z(t) {\\n\\ttry {\\n\\t\\treturn T(t, p);\\n\\t} catch {\\n\\t\\treturn !1;\\n\\t}\\n}\\nvar H = [], v = /* @__PURE__ */ new WeakMap();\\nfunction E(t, e) {\\n\\tif (typeof t != \\\"function\\\")\\n\\t\\treturn it(!1, t, e);\\n\\tif (z(t))\\n\\t\\treturn t;\\n\\tlet n = it(!0), r = function() {\\n\\t\\tlet [o, ...c] = v.get(r);\\n\\t\\tif (v.set(r, /* @__PURE__ */ new Set([o])), H.push(r), dt(n, t()), H.pop(), !c.length)\\n\\t\\t\\treturn;\\n\\t\\tlet s = v.get(r);\\n\\t\\tfor (let a of c)\\n\\t\\t\\ts.has(a) || L(a, r);\\n\\t};\\n\\treturn v.set(n[p], r), v.set(r, /* @__PURE__ */ new Set([n])), r(), n;\\n}\\nE.action = function(t, e, ...n) {\\n\\tlet r = t[p], { actions: o } = r;\\n\\tif (!o || !(e in o))\\n\\t\\tthrow new Error(`'${t}' has no action with name '${e}'!`);\\n\\tif (o[e].apply(r, n), r.skip)\\n\\t\\treturn delete r.skip;\\n\\tr.listeners.forEach((c) => c(r.value));\\n};\\nE.on = function t(e, n, r = {}) {\\n\\tlet { signal: o } = r;\\n\\tif (!(o && o.aborted)) {\\n\\t\\tif (Array.isArray(e))\\n\\t\\t\\treturn e.forEach((c) => t(c, n, r));\\n\\t\\tQ(e, n), o && o.addEventListener(\\\"abort\\\", () => L(e, n));\\n\\t}\\n};\\nE.symbols = {\\n\\t//observable: mark,\\n\\tonclear: Symbol.for(\\\"Observable.onclear\\\")\\n};\\nE.clear = function(...t) {\\n\\tfor (let n of t) {\\n\\t\\tlet r = n[p];\\n\\t\\tr && (delete n.toJSON, r.onclear.forEach((o) => o.call(r)), e(n, r), delete n[p]);\\n\\t}\\n\\tfunction e(n, r) {\\n\\t\\tr.listeners.forEach((o) => {\\n\\t\\t\\tif (r.listeners.delete(o), !v.has(o))\\n\\t\\t\\t\\treturn;\\n\\t\\t\\tlet c = v.get(o);\\n\\t\\t\\tc.delete(n), !(c.size > 1) && (n.clear(...c), v.delete(o));\\n\\t\\t});\\n\\t}\\n};\\nvar R = \\\"__dde_reactive\\\";\\nE.el = function(t, e) {\\n\\tlet n = M.mark({ type: \\\"reactive\\\" }, !0), r = n.end, o = d.D.createDocumentFragment();\\n\\to.append(n, r);\\n\\tlet { current: c } = m, s = {}, a = (h) => {\\n\\t\\tif (!n.parentNode || !r.parentNode)\\n\\t\\t\\treturn L(t, a);\\n\\t\\tlet g = s;\\n\\t\\ts = {}, m.push(c);\\n\\t\\tlet l = e(h, function(u, f) {\\n\\t\\t\\tlet b;\\n\\t\\t\\treturn T(g, u) ? (b = g[u], delete g[u]) : b = f(), s[u] = b, b;\\n\\t\\t});\\n\\t\\tm.pop(), Array.isArray(l) || (l = [l]);\\n\\t\\tlet x = document.createComment(\\\"\\\");\\n\\t\\tl.push(x), n.after(...l);\\n\\t\\tlet w;\\n\\t\\tfor (; (w = x.nextSibling) && w !== r; )\\n\\t\\t\\tw.remove();\\n\\t\\tx.remove(), n.isConnected && At(c.host());\\n\\t};\\n\\treturn Q(t, a), ft(t, a, n, e), a(t()), o;\\n};\\nfunction At(t) {\\n\\t!t || !t[R] || (requestIdleCallback || setTimeout)(function() {\\n\\t\\tt[R] = t[R].filter(([e, n]) => n.isConnected ? !0 : (L(...e), !1));\\n\\t});\\n}\\nvar Ct = {\\n\\t_set(t) {\\n\\t\\tthis.value = t;\\n\\t}\\n};\\nfunction St(t) {\\n\\treturn function(e, n) {\\n\\t\\tlet r = (...c) => c.length ? e.setAttribute(n, ...c) : K(r), o = at(r, e.getAttribute(n), Ct);\\n\\t\\treturn t[n] = o, o;\\n\\t};\\n}\\nvar G = \\\"__dde_attributes\\\";\\nE.observedAttributes = function(t) {\\n\\tlet e = t[G] = {}, n = F(t, St(e));\\n\\treturn O.attributeChanged(function({ detail: o }) {\\n\\t\\t/*! This maps attributes to observables (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tlet [c, s] = o, a = this[G][c];\\n\\t\\tif (a)\\n\\t\\t\\treturn E.action(a, \\\"_set\\\", s);\\n\\t})(t), O.disconnected(function() {\\n\\t\\t/*! This removes all observables mapped to attributes (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tE.clear(...Object.values(this[G]));\\n\\t})(t), n;\\n};\\nvar ut = {\\n\\tisObservable: z,\\n\\tprocessReactiveAttribute(t, e, n, r) {\\n\\t\\tif (!z(n))\\n\\t\\t\\treturn n;\\n\\t\\tlet o = (c) => {\\n\\t\\t\\tif (!t.isConnected)\\n\\t\\t\\t\\treturn L(n, o);\\n\\t\\t\\tr(e, c);\\n\\t\\t};\\n\\t\\treturn Q(n, o), ft(n, o, t, e), n();\\n\\t}\\n};\\nfunction ft(t, e, ...n) {\\n\\tlet { current: r } = m;\\n\\tr.prevent || r.host(function(o) {\\n\\t\\to[R] || (o[R] = [], O.disconnected(\\n\\t\\t\\t() => (\\n\\t\\t\\t\\t/*!\\n\\t\\t\\t\\t* Clears all Observables listeners added in the current scope/host (`O.el`, `assign`, …?).\\n\\t\\t\\t\\t* You can investigate the `__dde_reactive` key of the element.\\n\\t\\t\\t\\t* */\\n\\t\\t\\t\\to[R].forEach(([[c, s]]) => L(c, s, c[p] && c[p].host && c[p].host() === o))\\n\\t\\t\\t)\\n\\t\\t)(o)), o[R].push([[t, e], ...n]);\\n\\t});\\n}\\nfunction it(t, e, n) {\\n\\tlet r = t ? () => K(r) : (...o) => o.length ? dt(r, ...o) : K(r);\\n\\treturn at(r, e, n, t);\\n}\\nvar Dt = Object.assign(/* @__PURE__ */ Object.create(null), {\\n\\tstopPropagation() {\\n\\t\\tthis.skip = !0;\\n\\t}\\n}), V = class extends Error {\\n\\tconstructor() {\\n\\t\\tsuper();\\n\\t\\tlet [e, ...n] = this.stack.split(`\\n`), r = e.slice(e.indexOf(\\\"@\\\"), e.indexOf(\\\".js:\\\") + 4);\\n\\t\\tthis.stack = n.find((o) => !o.includes(r));\\n\\t}\\n};\\nfunction at(t, e, n, r = !1) {\\n\\tlet o = [];\\n\\tX(n) !== \\\"[object Object]\\\" && (n = {});\\n\\tlet { onclear: c } = E.symbols;\\n\\tn[c] && (o.push(n[c]), delete n[c]);\\n\\tlet { host: s } = m;\\n\\treturn Reflect.defineProperty(t, p, {\\n\\t\\tvalue: {\\n\\t\\t\\tvalue: e,\\n\\t\\t\\tactions: n,\\n\\t\\t\\tonclear: o,\\n\\t\\t\\thost: s,\\n\\t\\t\\tlisteners: /* @__PURE__ */ new Set(),\\n\\t\\t\\tdefined: new V().stack,\\n\\t\\t\\treadonly: r\\n\\t\\t},\\n\\t\\tenumerable: !1,\\n\\t\\twritable: !1,\\n\\t\\tconfigurable: !0\\n\\t}), t.toJSON = () => t(), t.valueOf = () => t[p] && t[p].value, Object.setPrototypeOf(t[p], Dt), t;\\n}\\nfunction Rt() {\\n\\treturn H[H.length - 1];\\n}\\nfunction K(t) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet { value: e, listeners: n } = t[p], r = Rt();\\n\\treturn r && n.add(r), v.has(r) && v.get(r).add(t), e;\\n}\\nfunction dt(t, e, n) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet r = t[p];\\n\\tif (!(!n && r.value === e))\\n\\t\\treturn r.value = e, r.listeners.forEach((o) => o(e)), e;\\n}\\nfunction Q(t, e) {\\n\\tif (t[p])\\n\\t\\treturn t[p].listeners.add(e);\\n}\\nfunction L(t, e, n) {\\n\\tlet r = t[p];\\n\\tif (!r)\\n\\t\\treturn;\\n\\tlet o = r.listeners.delete(e);\\n\\tif (n && !r.listeners.size) {\\n\\t\\tif (E.clear(t), !v.has(r))\\n\\t\\t\\treturn o;\\n\\t\\tlet c = v.get(r);\\n\\t\\tif (!v.has(c))\\n\\t\\t\\treturn o;\\n\\t\\tv.get(c).forEach((s) => L(s, c, !0));\\n\\t}\\n\\treturn o;\\n}\\n\\n// observables.js\\nB(ut);\\nexport {\\n\\tE as O,\\n\\tj as assign,\\n\\tnt as assignAttribute,\\n\\tht as chainableAppend,\\n\\tvt as classListDeclarative,\\n\\tM as createElement,\\n\\tqt as createElementNS,\\n\\tZt as customElementRender,\\n\\twt as customElementWithDDE,\\n\\tQt as dispatchEvent,\\n\\tM as el,\\n\\tqt as elNS,\\n\\tgt as elementAttribute,\\n\\tFt as empty,\\n\\tz as isObservable,\\n\\twt as lifecyclesToEvents,\\n\\tE as observable,\\n\\tyt as observedAttributes,\\n\\tO as on,\\n\\tB as registerReactivity,\\n\\tm as scope,\\n\\tWt as simulateSlots\\n};\\n\"}],\"toolbar\":false}"));</script><p>…this is actually one of the two differences. The another one is that <code>on</code> accepts only object as the <code>options</code> (but it is still optional).</p><p class="notice">The other difference is that there is <strong>no</strong> <code>off</code> function. You can remove listener declaratively using <a href="https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#signal" title="part of addEventListener on MDN">AbortSignal</a>:</p><!--<dde:mark type="component" name="example" host="this" ssr/>--><div id="code-example-1-8r8qappf8mo" class="example"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">import { el, on } from "./esm-with-observables.js";
const log= mark=&gt; console.log.bind(console, mark);
const abort_controller= new AbortController();
const { signal }= abort_controller;
const button= el("button", "Test click");
button.addEventListener("click", log("`addEventListener`"), { signal });
on("click", log("`on`"), { signal })(button);
document.body.append(
button, " ", el("button", { textContent: "Off", onclick: ()=&gt; abort_controller.abort() })
);
</code></div><script>Flems(document.getElementById("code-example-1-8r8qappf8mo"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el, on } from \\\"./esm-with-observables.js\\\";\\nconst log= mark=> console.log.bind(console, mark);\\n\\nconst abort_controller= new AbortController();\\nconst { signal }= abort_controller;\\n\\nconst button= el(\\\"button\\\", \\\"Test click\\\");\\nbutton.addEventListener(\\\"click\\\", log(\\\"`addEventListener`\\\"), { signal });\\non(\\\"click\\\", log(\\\"`on`\\\"), { signal })(button);\\n\\ndocument.body.append(\\n\\tbutton, \\\" \\\", el(\\\"button\\\", { textContent: \\\"Off\\\", onclick: ()=> abort_controller.abort() })\\n);\\n\"},{\"name\":\"esm-with-observables.js\",\"content\":\"// src/observables-common.js\\nvar k = {\\n\\tisObservable(t) {\\n\\t\\treturn !1;\\n\\t},\\n\\tprocessReactiveAttribute(t, e, n, r) {\\n\\t\\treturn n;\\n\\t}\\n};\\nfunction B(t, e = !0) {\\n\\treturn e ? 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(b = g[u], delete g[u]) : b = f(), s[u] = b, b;\\n\\t\\t});\\n\\t\\tm.pop(), Array.isArray(l) || (l = [l]);\\n\\t\\tlet x = document.createComment(\\\"\\\");\\n\\t\\tl.push(x), n.after(...l);\\n\\t\\tlet w;\\n\\t\\tfor (; (w = x.nextSibling) && w !== r; )\\n\\t\\t\\tw.remove();\\n\\t\\tx.remove(), n.isConnected && At(c.host());\\n\\t};\\n\\treturn Q(t, a), ft(t, a, n, e), a(t()), o;\\n};\\nfunction At(t) {\\n\\t!t || !t[R] || (requestIdleCallback || setTimeout)(function() {\\n\\t\\tt[R] = t[R].filter(([e, n]) => n.isConnected ? !0 : (L(...e), !1));\\n\\t});\\n}\\nvar Ct = {\\n\\t_set(t) {\\n\\t\\tthis.value = t;\\n\\t}\\n};\\nfunction St(t) {\\n\\treturn function(e, n) {\\n\\t\\tlet r = (...c) => c.length ? e.setAttribute(n, ...c) : K(r), o = at(r, e.getAttribute(n), Ct);\\n\\t\\treturn t[n] = o, o;\\n\\t};\\n}\\nvar G = \\\"__dde_attributes\\\";\\nE.observedAttributes = function(t) {\\n\\tlet e = t[G] = {}, n = F(t, St(e));\\n\\treturn O.attributeChanged(function({ detail: o }) {\\n\\t\\t/*! This maps attributes to observables (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tlet [c, s] = o, a = this[G][c];\\n\\t\\tif (a)\\n\\t\\t\\treturn E.action(a, \\\"_set\\\", s);\\n\\t})(t), O.disconnected(function() {\\n\\t\\t/*! This removes all observables mapped to attributes (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tE.clear(...Object.values(this[G]));\\n\\t})(t), n;\\n};\\nvar ut = {\\n\\tisObservable: z,\\n\\tprocessReactiveAttribute(t, e, n, r) {\\n\\t\\tif (!z(n))\\n\\t\\t\\treturn n;\\n\\t\\tlet o = (c) => {\\n\\t\\t\\tif (!t.isConnected)\\n\\t\\t\\t\\treturn L(n, o);\\n\\t\\t\\tr(e, c);\\n\\t\\t};\\n\\t\\treturn Q(n, o), ft(n, o, t, e), n();\\n\\t}\\n};\\nfunction ft(t, e, ...n) {\\n\\tlet { current: r } = m;\\n\\tr.prevent || r.host(function(o) {\\n\\t\\to[R] || (o[R] = [], O.disconnected(\\n\\t\\t\\t() => (\\n\\t\\t\\t\\t/*!\\n\\t\\t\\t\\t* Clears all Observables listeners added in the current scope/host (`O.el`, `assign`, …?).\\n\\t\\t\\t\\t* You can investigate the `__dde_reactive` key of the element.\\n\\t\\t\\t\\t* */\\n\\t\\t\\t\\to[R].forEach(([[c, s]]) => L(c, s, c[p] && c[p].host && c[p].host() === o))\\n\\t\\t\\t)\\n\\t\\t)(o)), o[R].push([[t, e], ...n]);\\n\\t});\\n}\\nfunction it(t, e, n) {\\n\\tlet r = t ? () => K(r) : (...o) => o.length ? dt(r, ...o) : K(r);\\n\\treturn at(r, e, n, t);\\n}\\nvar Dt = Object.assign(/* @__PURE__ */ Object.create(null), {\\n\\tstopPropagation() {\\n\\t\\tthis.skip = !0;\\n\\t}\\n}), V = class extends Error {\\n\\tconstructor() {\\n\\t\\tsuper();\\n\\t\\tlet [e, ...n] = this.stack.split(`\\n`), r = e.slice(e.indexOf(\\\"@\\\"), e.indexOf(\\\".js:\\\") + 4);\\n\\t\\tthis.stack = n.find((o) => !o.includes(r));\\n\\t}\\n};\\nfunction at(t, e, n, r = !1) {\\n\\tlet o = [];\\n\\tX(n) !== \\\"[object Object]\\\" && (n = {});\\n\\tlet { onclear: c } = E.symbols;\\n\\tn[c] && (o.push(n[c]), delete n[c]);\\n\\tlet { host: s } = m;\\n\\treturn Reflect.defineProperty(t, p, {\\n\\t\\tvalue: {\\n\\t\\t\\tvalue: e,\\n\\t\\t\\tactions: n,\\n\\t\\t\\tonclear: o,\\n\\t\\t\\thost: s,\\n\\t\\t\\tlisteners: /* @__PURE__ */ new Set(),\\n\\t\\t\\tdefined: new V().stack,\\n\\t\\t\\treadonly: r\\n\\t\\t},\\n\\t\\tenumerable: !1,\\n\\t\\twritable: !1,\\n\\t\\tconfigurable: !0\\n\\t}), t.toJSON = () => t(), t.valueOf = () => t[p] && t[p].value, Object.setPrototypeOf(t[p], Dt), t;\\n}\\nfunction Rt() {\\n\\treturn H[H.length - 1];\\n}\\nfunction K(t) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet { value: e, listeners: n } = t[p], r = Rt();\\n\\treturn r && n.add(r), v.has(r) && v.get(r).add(t), e;\\n}\\nfunction dt(t, e, n) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet r = t[p];\\n\\tif (!(!n && r.value === e))\\n\\t\\treturn r.value = e, r.listeners.forEach((o) => o(e)), e;\\n}\\nfunction Q(t, e) {\\n\\tif (t[p])\\n\\t\\treturn t[p].listeners.add(e);\\n}\\nfunction L(t, e, n) {\\n\\tlet r = t[p];\\n\\tif (!r)\\n\\t\\treturn;\\n\\tlet o = r.listeners.delete(e);\\n\\tif (n && !r.listeners.size) {\\n\\t\\tif (E.clear(t), !v.has(r))\\n\\t\\t\\treturn o;\\n\\t\\tlet c = v.get(r);\\n\\t\\tif (!v.has(c))\\n\\t\\t\\treturn o;\\n\\t\\tv.get(c).forEach((s) => L(s, c, !0));\\n\\t}\\n\\treturn o;\\n}\\n\\n// observables.js\\nB(ut);\\nexport {\\n\\tE as O,\\n\\tj as assign,\\n\\tnt as assignAttribute,\\n\\tht as chainableAppend,\\n\\tvt as classListDeclarative,\\n\\tM as createElement,\\n\\tqt as createElementNS,\\n\\tZt as customElementRender,\\n\\twt as customElementWithDDE,\\n\\tQt as dispatchEvent,\\n\\tM as el,\\n\\tqt as elNS,\\n\\tgt as elementAttribute,\\n\\tFt as empty,\\n\\tz as isObservable,\\n\\twt as lifecyclesToEvents,\\n\\tE as observable,\\n\\tyt as observedAttributes,\\n\\tO as on,\\n\\tB as registerReactivity,\\n\\tm as scope,\\n\\tWt as simulateSlots\\n};\\n\"}],\"toolbar\":false}"));</script><div class="notice"><p>So, there are (typically) three ways to handle events. You can use:</p><ul><li><code>el("button", { textContent: "click me", "=onclick": "console.log(event)" })</code></li><li><code>el("button", { textContent: "click me", onclick: console.log })</code></li><li><code>el("button", { textContent: "click me" }, on("click", console.log))</code></li></ul><p>In the first example we force to use HTML attribute (it corresponds to <code>&lt;button onclick="console.log(event)"&gt;click me&lt;/button&gt;</code>). <em>Side note: this can be useful in case of SSR.</em> To study difference, you can read a nice summary here: <a href="https://gist.github.com/WebReflection/b404c36f46371e3b1173bf5492acc944">GIST @WebReflection/web_events.md</a>.</p></div><h3 id="h-addons"><!--<dde:mark type="component" name="h3" host="parentElement" ssr/>--><a href="#h-addons" tabindex="-1">#</a> Addons</h3><p>From practical point of view, <em>Addons</em> are just functions that accept any html element as their first parameter. You can see that the <code>on(…)</code> fullfills this requirement.</p><p>You can use Addons as ≥3rd argument of <code>el</code> function. This way is possible to extends you templates by additional (3rd party) functionalities. But for now mainly, you can add events listeners:</p><!--<dde:mark type="component" name="example" host="this" ssr/>--><div id="code-example-1-6jtsnxfqzm4" class="example"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">import { el, on } from "./esm-with-observables.js";
const abort_controller= new AbortController();
const { signal }= abort_controller;
/** @type {ddeElementAddon&lt;HTMLButtonElement&gt;} */
const onclickOff= on("click", ()=&gt; abort_controller.abort(), { signal });
/** @type {(ref?: HTMLOutputElement)=&gt; HTMLOutputElement | null} */
const ref= (store=&gt; ref=&gt; ref ? (store= ref) : store)(null);
document.body.append(
el("button", "Test `on`",
on("click", console.log, { signal }),
on("click", update, { signal }),
on("mouseup", update, { signal })),
" ",
el("button", "Off", onclickOff),
el("output", { style: { display: "block", whiteSpace: "pre" } }, ref)
);
/** @param {MouseEvent} event @this {HTMLButtonElement} */
function update(event){
ref().append(
event.type,
"\n"
);
}
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(b = g[u], delete g[u]) : b = f(), s[u] = b, b;\\n\\t\\t});\\n\\t\\tm.pop(), Array.isArray(l) || (l = [l]);\\n\\t\\tlet x = document.createComment(\\\"\\\");\\n\\t\\tl.push(x), n.after(...l);\\n\\t\\tlet w;\\n\\t\\tfor (; (w = x.nextSibling) && w !== r; )\\n\\t\\t\\tw.remove();\\n\\t\\tx.remove(), n.isConnected && At(c.host());\\n\\t};\\n\\treturn Q(t, a), ft(t, a, n, e), a(t()), o;\\n};\\nfunction At(t) {\\n\\t!t || !t[R] || (requestIdleCallback || setTimeout)(function() {\\n\\t\\tt[R] = t[R].filter(([e, n]) => n.isConnected ? !0 : (L(...e), !1));\\n\\t});\\n}\\nvar Ct = {\\n\\t_set(t) {\\n\\t\\tthis.value = t;\\n\\t}\\n};\\nfunction St(t) {\\n\\treturn function(e, n) {\\n\\t\\tlet r = (...c) => c.length ? e.setAttribute(n, ...c) : K(r), o = at(r, e.getAttribute(n), Ct);\\n\\t\\treturn t[n] = o, o;\\n\\t};\\n}\\nvar G = \\\"__dde_attributes\\\";\\nE.observedAttributes = function(t) {\\n\\tlet e = t[G] = {}, n = F(t, St(e));\\n\\treturn O.attributeChanged(function({ detail: o }) {\\n\\t\\t/*! This maps attributes to observables (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tlet [c, s] = o, a = this[G][c];\\n\\t\\tif (a)\\n\\t\\t\\treturn E.action(a, \\\"_set\\\", s);\\n\\t})(t), O.disconnected(function() {\\n\\t\\t/*! This removes all observables mapped to attributes (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tE.clear(...Object.values(this[G]));\\n\\t})(t), n;\\n};\\nvar ut = {\\n\\tisObservable: z,\\n\\tprocessReactiveAttribute(t, e, n, r) {\\n\\t\\tif (!z(n))\\n\\t\\t\\treturn n;\\n\\t\\tlet o = (c) => {\\n\\t\\t\\tif (!t.isConnected)\\n\\t\\t\\t\\treturn L(n, o);\\n\\t\\t\\tr(e, c);\\n\\t\\t};\\n\\t\\treturn Q(n, o), ft(n, o, t, e), n();\\n\\t}\\n};\\nfunction ft(t, e, ...n) {\\n\\tlet { current: r } = m;\\n\\tr.prevent || r.host(function(o) {\\n\\t\\to[R] || (o[R] = [], O.disconnected(\\n\\t\\t\\t() => (\\n\\t\\t\\t\\t/*!\\n\\t\\t\\t\\t* Clears all Observables listeners added in the current scope/host (`O.el`, `assign`, …?).\\n\\t\\t\\t\\t* You can investigate the `__dde_reactive` key of the element.\\n\\t\\t\\t\\t* */\\n\\t\\t\\t\\to[R].forEach(([[c, s]]) => L(c, s, c[p] && c[p].host && c[p].host() === o))\\n\\t\\t\\t)\\n\\t\\t)(o)), o[R].push([[t, e], ...n]);\\n\\t});\\n}\\nfunction it(t, e, n) {\\n\\tlet r = t ? () => K(r) : (...o) => o.length ? dt(r, ...o) : K(r);\\n\\treturn at(r, e, n, t);\\n}\\nvar Dt = Object.assign(/* @__PURE__ */ Object.create(null), {\\n\\tstopPropagation() {\\n\\t\\tthis.skip = !0;\\n\\t}\\n}), V = class extends Error {\\n\\tconstructor() {\\n\\t\\tsuper();\\n\\t\\tlet [e, ...n] = this.stack.split(`\\n`), r = e.slice(e.indexOf(\\\"@\\\"), e.indexOf(\\\".js:\\\") + 4);\\n\\t\\tthis.stack = n.find((o) => !o.includes(r));\\n\\t}\\n};\\nfunction at(t, e, n, r = !1) {\\n\\tlet o = [];\\n\\tX(n) !== \\\"[object Object]\\\" && (n = {});\\n\\tlet { onclear: c } = E.symbols;\\n\\tn[c] && (o.push(n[c]), delete n[c]);\\n\\tlet { host: s } = m;\\n\\treturn Reflect.defineProperty(t, p, {\\n\\t\\tvalue: {\\n\\t\\t\\tvalue: e,\\n\\t\\t\\tactions: n,\\n\\t\\t\\tonclear: o,\\n\\t\\t\\thost: s,\\n\\t\\t\\tlisteners: /* @__PURE__ */ new Set(),\\n\\t\\t\\tdefined: new V().stack,\\n\\t\\t\\treadonly: r\\n\\t\\t},\\n\\t\\tenumerable: !1,\\n\\t\\twritable: !1,\\n\\t\\tconfigurable: !0\\n\\t}), t.toJSON = () => t(), t.valueOf = () => t[p] && t[p].value, Object.setPrototypeOf(t[p], Dt), t;\\n}\\nfunction Rt() {\\n\\treturn H[H.length - 1];\\n}\\nfunction K(t) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet { value: e, listeners: n } = t[p], r = Rt();\\n\\treturn r && n.add(r), v.has(r) && v.get(r).add(t), e;\\n}\\nfunction dt(t, e, n) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet r = t[p];\\n\\tif (!(!n && r.value === e))\\n\\t\\treturn r.value = e, r.listeners.forEach((o) => o(e)), e;\\n}\\nfunction Q(t, e) {\\n\\tif (t[p])\\n\\t\\treturn t[p].listeners.add(e);\\n}\\nfunction L(t, e, n) {\\n\\tlet r = t[p];\\n\\tif (!r)\\n\\t\\treturn;\\n\\tlet o = r.listeners.delete(e);\\n\\tif (n && !r.listeners.size) {\\n\\t\\tif (E.clear(t), !v.has(r))\\n\\t\\t\\treturn o;\\n\\t\\tlet c = v.get(r);\\n\\t\\tif (!v.has(c))\\n\\t\\t\\treturn o;\\n\\t\\tv.get(c).forEach((s) => L(s, c, !0));\\n\\t}\\n\\treturn o;\\n}\\n\\n// observables.js\\nB(ut);\\nexport {\\n\\tE as O,\\n\\tj as assign,\\n\\tnt as assignAttribute,\\n\\tht as chainableAppend,\\n\\tvt as classListDeclarative,\\n\\tM as createElement,\\n\\tqt as createElementNS,\\n\\tZt as customElementRender,\\n\\twt as customElementWithDDE,\\n\\tQt as dispatchEvent,\\n\\tM as el,\\n\\tqt as elNS,\\n\\tgt as elementAttribute,\\n\\tFt as empty,\\n\\tz as isObservable,\\n\\twt as lifecyclesToEvents,\\n\\tE as observable,\\n\\tyt as observedAttributes,\\n\\tO as on,\\n\\tB as registerReactivity,\\n\\tm as scope,\\n\\tWt as simulateSlots\\n};\\n\"}],\"toolbar\":false}"));</script><p>As the example shows, you can also provide types in JSDoc+TypeScript by using global type <code>ddeElementAddon</code>. Also notice, you can use Addons to get element reference.</p><h3 id="h-life-cycle-events"><!--<dde:mark type="component" name="h3" host="parentElement" ssr/>--><a href="#h-life-cycle-events" tabindex="-1">#</a> Life-cycle events</h3><p>Addons are called immediately when the element is created, even it is not connected to live DOM yet. Therefore, you can understand the Addon to be “oncreate” event.</p><p>The library provide three additional live-cycle events corresponding to how they are named in a case of custom elements: <code>on.connected</code>, <code>on.disconnected</code> and <code>on.attributeChanged</code>.</p><!--<dde:mark type="component" name="example" host="this" ssr/>--><div id="code-example-1-35hjjp3e4js" class="example"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">import { el, on } from "./esm-with-observables.js";
const paragraph= el("p", "See live-cycle events in console.",
el=&gt; log({ type: "dde:created", detail: el }),
on.connected(log),
on.disconnected(log),
on.attributeChanged(log));
document.body.append(
paragraph,
el("button", "Update attribute", on("click", ()=&gt; paragraph.setAttribute("test", Math.random().toString()))),
" ",
el("button", "Remove", on("click", ()=&gt; paragraph.remove()))
);
/** @param {Partial&lt;CustomEvent&gt;} event */
function log({ type, detail }){
console.log({ _this: this, type, detail });
}
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(r.dispatchEvent(new Event(y)), r) : (q(e.signal, () => D.offConnected(r, t)) && D.onConnected(r, t), r);\\n\\t};\\n};\\nO.disconnected = function(t, e) {\\n\\treturn e = st(e), function(r) {\\n\\t\\treturn r.addEventListener(S, t, e), r[C] || q(e.signal, () => D.offDisconnected(r, t)) && D.onDisconnected(r, t), r;\\n\\t};\\n};\\nvar Z = /* @__PURE__ */ new WeakMap();\\nO.disconnectedAsAbort = function(t) {\\n\\tif (Z.has(t))\\n\\t\\treturn Z.get(t);\\n\\tlet e = new AbortController();\\n\\treturn Z.set(t, e), t(O.disconnected(() => e.abort())), e;\\n};\\nvar _t = /* @__PURE__ */ new WeakSet();\\nO.attributeChanged = function(t, e) {\\n\\treturn typeof e != \\\"object\\\" && (e = {}), function(r) {\\n\\t\\tif (r.addEventListener(P, t, e), r[C] || _t.has(r) || !d.M)\\n\\t\\t\\treturn r;\\n\\t\\tlet o = new d.M(function(s) {\\n\\t\\t\\tfor (let { attributeName: a, target: h } of s)\\n\\t\\t\\t\\th.dispatchEvent(\\n\\t\\t\\t\\t\\tnew CustomEvent(P, { detail: [a, h.getAttribute(a)] })\\n\\t\\t\\t\\t);\\n\\t\\t});\\n\\t\\treturn q(e.signal, () => o.disconnect()) && o.observe(r, { attributes: !0 }), r;\\n\\t};\\n};\\n\\n// src/observables-lib.js\\nvar p = \\\"__dde_observable\\\";\\nfunction z(t) {\\n\\ttry {\\n\\t\\treturn T(t, p);\\n\\t} catch {\\n\\t\\treturn !1;\\n\\t}\\n}\\nvar H = [], v = /* @__PURE__ */ new WeakMap();\\nfunction E(t, e) {\\n\\tif (typeof t != \\\"function\\\")\\n\\t\\treturn it(!1, t, e);\\n\\tif (z(t))\\n\\t\\treturn t;\\n\\tlet n = it(!0), r = function() {\\n\\t\\tlet [o, ...c] = v.get(r);\\n\\t\\tif (v.set(r, /* @__PURE__ */ new Set([o])), H.push(r), dt(n, t()), H.pop(), !c.length)\\n\\t\\t\\treturn;\\n\\t\\tlet s = v.get(r);\\n\\t\\tfor (let a of c)\\n\\t\\t\\ts.has(a) || L(a, r);\\n\\t};\\n\\treturn v.set(n[p], r), v.set(r, /* @__PURE__ */ new Set([n])), r(), n;\\n}\\nE.action = function(t, e, ...n) {\\n\\tlet r = t[p], { actions: o } = r;\\n\\tif (!o || !(e in o))\\n\\t\\tthrow new Error(`'${t}' has no action with name '${e}'!`);\\n\\tif (o[e].apply(r, n), r.skip)\\n\\t\\treturn delete r.skip;\\n\\tr.listeners.forEach((c) => c(r.value));\\n};\\nE.on = function t(e, n, r = {}) {\\n\\tlet { signal: o } = r;\\n\\tif (!(o && o.aborted)) {\\n\\t\\tif (Array.isArray(e))\\n\\t\\t\\treturn e.forEach((c) => t(c, n, r));\\n\\t\\tQ(e, n), o && o.addEventListener(\\\"abort\\\", () => L(e, n));\\n\\t}\\n};\\nE.symbols = {\\n\\t//observable: mark,\\n\\tonclear: Symbol.for(\\\"Observable.onclear\\\")\\n};\\nE.clear = function(...t) {\\n\\tfor (let n of t) {\\n\\t\\tlet r = n[p];\\n\\t\\tr && (delete n.toJSON, r.onclear.forEach((o) => o.call(r)), e(n, r), delete n[p]);\\n\\t}\\n\\tfunction e(n, r) {\\n\\t\\tr.listeners.forEach((o) => {\\n\\t\\t\\tif (r.listeners.delete(o), !v.has(o))\\n\\t\\t\\t\\treturn;\\n\\t\\t\\tlet c = v.get(o);\\n\\t\\t\\tc.delete(n), !(c.size > 1) && (n.clear(...c), v.delete(o));\\n\\t\\t});\\n\\t}\\n};\\nvar R = \\\"__dde_reactive\\\";\\nE.el = function(t, e) {\\n\\tlet n = M.mark({ type: \\\"reactive\\\" }, !0), r = n.end, o = d.D.createDocumentFragment();\\n\\to.append(n, r);\\n\\tlet { current: c } = m, s = {}, a = (h) => {\\n\\t\\tif (!n.parentNode || !r.parentNode)\\n\\t\\t\\treturn L(t, a);\\n\\t\\tlet g = s;\\n\\t\\ts = {}, m.push(c);\\n\\t\\tlet l = e(h, function(u, f) {\\n\\t\\t\\tlet b;\\n\\t\\t\\treturn T(g, u) ? (b = g[u], delete g[u]) : b = f(), s[u] = b, b;\\n\\t\\t});\\n\\t\\tm.pop(), Array.isArray(l) || (l = [l]);\\n\\t\\tlet x = document.createComment(\\\"\\\");\\n\\t\\tl.push(x), n.after(...l);\\n\\t\\tlet w;\\n\\t\\tfor (; (w = x.nextSibling) && w !== r; )\\n\\t\\t\\tw.remove();\\n\\t\\tx.remove(), n.isConnected && At(c.host());\\n\\t};\\n\\treturn Q(t, a), ft(t, a, n, e), a(t()), o;\\n};\\nfunction At(t) {\\n\\t!t || !t[R] || (requestIdleCallback || setTimeout)(function() {\\n\\t\\tt[R] = t[R].filter(([e, n]) => n.isConnected ? !0 : (L(...e), !1));\\n\\t});\\n}\\nvar Ct = {\\n\\t_set(t) {\\n\\t\\tthis.value = t;\\n\\t}\\n};\\nfunction St(t) {\\n\\treturn function(e, n) {\\n\\t\\tlet r = (...c) => c.length ? e.setAttribute(n, ...c) : K(r), o = at(r, e.getAttribute(n), Ct);\\n\\t\\treturn t[n] = o, o;\\n\\t};\\n}\\nvar G = \\\"__dde_attributes\\\";\\nE.observedAttributes = function(t) {\\n\\tlet e = t[G] = {}, n = F(t, St(e));\\n\\treturn O.attributeChanged(function({ detail: o }) {\\n\\t\\t/*! This maps attributes to observables (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tlet [c, s] = o, a = this[G][c];\\n\\t\\tif (a)\\n\\t\\t\\treturn E.action(a, \\\"_set\\\", s);\\n\\t})(t), O.disconnected(function() {\\n\\t\\t/*! This removes all observables mapped to attributes (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tE.clear(...Object.values(this[G]));\\n\\t})(t), n;\\n};\\nvar ut = {\\n\\tisObservable: z,\\n\\tprocessReactiveAttribute(t, e, n, r) {\\n\\t\\tif (!z(n))\\n\\t\\t\\treturn n;\\n\\t\\tlet o = (c) => {\\n\\t\\t\\tif (!t.isConnected)\\n\\t\\t\\t\\treturn L(n, o);\\n\\t\\t\\tr(e, c);\\n\\t\\t};\\n\\t\\treturn Q(n, o), ft(n, o, t, e), n();\\n\\t}\\n};\\nfunction ft(t, e, ...n) {\\n\\tlet { current: r } = m;\\n\\tr.prevent || r.host(function(o) {\\n\\t\\to[R] || (o[R] = [], O.disconnected(\\n\\t\\t\\t() => (\\n\\t\\t\\t\\t/*!\\n\\t\\t\\t\\t* Clears all Observables listeners added in the current scope/host (`O.el`, `assign`, …?).\\n\\t\\t\\t\\t* You can investigate the `__dde_reactive` key of the element.\\n\\t\\t\\t\\t* */\\n\\t\\t\\t\\to[R].forEach(([[c, s]]) => L(c, s, c[p] && c[p].host && c[p].host() === o))\\n\\t\\t\\t)\\n\\t\\t)(o)), o[R].push([[t, e], ...n]);\\n\\t});\\n}\\nfunction it(t, e, n) {\\n\\tlet r = t ? () => K(r) : (...o) => o.length ? dt(r, ...o) : K(r);\\n\\treturn at(r, e, n, t);\\n}\\nvar Dt = Object.assign(/* @__PURE__ */ Object.create(null), {\\n\\tstopPropagation() {\\n\\t\\tthis.skip = !0;\\n\\t}\\n}), V = class extends Error {\\n\\tconstructor() {\\n\\t\\tsuper();\\n\\t\\tlet [e, ...n] = this.stack.split(`\\n`), r = e.slice(e.indexOf(\\\"@\\\"), e.indexOf(\\\".js:\\\") + 4);\\n\\t\\tthis.stack = n.find((o) => !o.includes(r));\\n\\t}\\n};\\nfunction at(t, e, n, r = !1) {\\n\\tlet o = [];\\n\\tX(n) !== \\\"[object Object]\\\" && (n = {});\\n\\tlet { onclear: c } = E.symbols;\\n\\tn[c] && (o.push(n[c]), delete n[c]);\\n\\tlet { host: s } = m;\\n\\treturn Reflect.defineProperty(t, p, {\\n\\t\\tvalue: {\\n\\t\\t\\tvalue: e,\\n\\t\\t\\tactions: n,\\n\\t\\t\\tonclear: o,\\n\\t\\t\\thost: s,\\n\\t\\t\\tlisteners: /* @__PURE__ */ new Set(),\\n\\t\\t\\tdefined: new V().stack,\\n\\t\\t\\treadonly: r\\n\\t\\t},\\n\\t\\tenumerable: !1,\\n\\t\\twritable: !1,\\n\\t\\tconfigurable: !0\\n\\t}), t.toJSON = () => t(), t.valueOf = () => t[p] && t[p].value, Object.setPrototypeOf(t[p], Dt), t;\\n}\\nfunction Rt() {\\n\\treturn H[H.length - 1];\\n}\\nfunction K(t) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet { value: e, listeners: n } = t[p], r = Rt();\\n\\treturn r && n.add(r), v.has(r) && v.get(r).add(t), e;\\n}\\nfunction dt(t, e, n) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet r = t[p];\\n\\tif (!(!n && r.value === e))\\n\\t\\treturn r.value = e, r.listeners.forEach((o) => o(e)), e;\\n}\\nfunction Q(t, e) {\\n\\tif (t[p])\\n\\t\\treturn t[p].listeners.add(e);\\n}\\nfunction L(t, e, n) {\\n\\tlet r = t[p];\\n\\tif (!r)\\n\\t\\treturn;\\n\\tlet o = r.listeners.delete(e);\\n\\tif (n && !r.listeners.size) {\\n\\t\\tif (E.clear(t), !v.has(r))\\n\\t\\t\\treturn o;\\n\\t\\tlet c = v.get(r);\\n\\t\\tif (!v.has(c))\\n\\t\\t\\treturn o;\\n\\t\\tv.get(c).forEach((s) => L(s, c, !0));\\n\\t}\\n\\treturn o;\\n}\\n\\n// observables.js\\nB(ut);\\nexport {\\n\\tE as O,\\n\\tj as assign,\\n\\tnt as assignAttribute,\\n\\tht as chainableAppend,\\n\\tvt as classListDeclarative,\\n\\tM as createElement,\\n\\tqt as createElementNS,\\n\\tZt as customElementRender,\\n\\twt as customElementWithDDE,\\n\\tQt as dispatchEvent,\\n\\tM as el,\\n\\tqt as elNS,\\n\\tgt as elementAttribute,\\n\\tFt as empty,\\n\\tz as isObservable,\\n\\twt as lifecyclesToEvents,\\n\\tE as observable,\\n\\tyt as observedAttributes,\\n\\tO as on,\\n\\tB as registerReactivity,\\n\\tm as scope,\\n\\tWt as simulateSlots\\n};\\n\"}],\"toolbar\":false}"));</script><p>For Custom elements, we will later introduce a way to replace <code>*Callback</code> syntax with <code>dde:*</code> events. The <code>on.*</code> functions then listen to the appropriate Custom Elements events (see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks">Custom element lifecycle callbacks | MDN</a>).</p><p>But, in case of regular elemnets the <a href="https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver"><code>MutationObserver</code> | MDN</a> is internaly used to track these events. Therefore, there are some drawbacks:</p><ul><li>To proper listener registration, you need to use <code>on.*</code> not `on("dde:*", …)`!</li><li>Use sparingly! Internally, library must loop of all registered events and fires event properly. <strong>It is good practice to use the fact that if an element is removed, its children are also removed!</strong> In this spirit, we will introduce later the <strong>host</strong> syntax to register clean up procedures when the component is removed from the app.</li></ul><p>To provide intuitive behaviour, similar also to how the life-cycle events works in other frameworks/libraries, deka-dom-el library ensures that <code>on.connected</code> and <code>on.disconnected</code> are called only once and only when the element is (dis)connected to live DOM. The solution is inspired by <a href="https://vuejs.org/guide/extras/web-components.html#lifecycle" title="Vue and Web Components | Lifecycle">Vue</a>. For using native behaviour re-(dis)connecting element, use:</p><ul><li>custom <code>MutationObserver</code> or logic in (dis)<div class="code"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js"></code></div> or…</li><li>re-add <code>on.connected</code> or <code>on.disconnected</code> listeners.</li></ul><h3 id="h-final-notes"><!--<dde:mark type="component" name="h3" host="parentElement" ssr/>--><a href="#h-final-notes" tabindex="-1">#</a> Final notes</h3><p>The library also provides a&nbsp;method to dispatch the events.</p><!--<dde:mark type="component" name="example" host="this" ssr/>--><div id="code-example-2-b6a1hbrxh7s" class="example"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">import { el, on, dispatchEvent } from "./esm-with-observables.js";
document.body.append(
el("p", "Listenning to `test` event.", on("test", console.log)).append(
el("br"),
el("button", "native", on("click", native)),
" ",
el("button", "dde", on("click", dde)),
" ",
el("button", "dde with options", on("click", ddeOptions))
)
);
function native(){
this.dispatchEvent(
new CustomEvent("test",
{ bubbles: true, detail: "hi" }
)
);
}
function dde(){
dispatchEvent("test")(this.parentElement, "hi");
}
function ddeOptions(){
dispatchEvent("test", { bubbles: true })(this, "hi");
}
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Ot() : new Proxy({}, {\\n\\tget() {\\n\\t\\treturn () => {\\n\\t\\t};\\n\\t}\\n});\\nfunction Ot() {\\n\\tlet t = /* @__PURE__ */ new Map(), e = !1, n = (i) => function(u) {\\n\\t\\tfor (let f of u)\\n\\t\\t\\tif (f.type === \\\"childList\\\") {\\n\\t\\t\\t\\tif (l(f.addedNodes, !0)) {\\n\\t\\t\\t\\t\\ti();\\n\\t\\t\\t\\t\\tcontinue;\\n\\t\\t\\t\\t}\\n\\t\\t\\t\\tx(f.removedNodes, !0) && i();\\n\\t\\t\\t}\\n\\t}, r = new d.M(n(a));\\n\\treturn {\\n\\t\\tobserve(i) {\\n\\t\\t\\tlet u = new d.M(n(() => {\\n\\t\\t\\t}));\\n\\t\\t\\treturn u.observe(i, { childList: !0, subtree: !0 }), () => u.disconnect();\\n\\t\\t},\\n\\t\\tonConnected(i, u) {\\n\\t\\t\\ts();\\n\\t\\t\\tlet f = c(i);\\n\\t\\t\\tf.connected.has(u) || (f.connected.add(u), f.length_c += 1);\\n\\t\\t},\\n\\t\\toffConnected(i, u) {\\n\\t\\t\\tif (!t.has(i))\\n\\t\\t\\t\\treturn;\\n\\t\\t\\tlet f = t.get(i);\\n\\t\\t\\tf.connected.has(u) && (f.connected.delete(u), f.length_c -= 1, o(i, f));\\n\\t\\t},\\n\\t\\tonDisconnected(i, u) {\\n\\t\\t\\ts();\\n\\t\\t\\tlet f = c(i);\\n\\t\\t\\tf.disconnected.has(u) || (f.disconnected.add(u), f.length_d += 1);\\n\\t\\t},\\n\\t\\toffDisconnected(i, u) {\\n\\t\\t\\tif (!t.has(i))\\n\\t\\t\\t\\treturn;\\n\\t\\t\\tlet f = t.get(i);\\n\\t\\t\\tf.disconnected.has(u) && (f.disconnected.delete(u), f.length_d -= 1, o(i, f));\\n\\t\\t}\\n\\t};\\n\\tfunction o(i, u) {\\n\\t\\tu.length_c || u.length_d || (t.delete(i), a());\\n\\t}\\n\\tfunction c(i) {\\n\\t\\tif (t.has(i))\\n\\t\\t\\treturn t.get(i);\\n\\t\\tlet u = {\\n\\t\\t\\tconnected: /* @__PURE__ */ new WeakSet(),\\n\\t\\t\\tlength_c: 0,\\n\\t\\t\\tdisconnected: /* @__PURE__ */ new WeakSet(),\\n\\t\\t\\tlength_d: 0\\n\\t\\t};\\n\\t\\treturn t.set(i, u), u;\\n\\t}\\n\\tfunction s() {\\n\\t\\te || (e = !0, r.observe(d.D.body, { childList: !0, subtree: !0 }));\\n\\t}\\n\\tfunction a() {\\n\\t\\t!e || t.size || (e = !1, r.disconnect());\\n\\t}\\n\\tfunction h() {\\n\\t\\treturn new Promise(function(i) {\\n\\t\\t\\t(requestIdleCallback || requestAnimationFrame)(i);\\n\\t\\t});\\n\\t}\\n\\tasync function g(i) {\\n\\t\\tt.size > 30 && await h();\\n\\t\\tlet u = [];\\n\\t\\tif (!(i instanceof Node))\\n\\t\\t\\treturn u;\\n\\t\\tfor (let f of t.keys())\\n\\t\\t\\tf === i || !(f instanceof Node) || i.contains(f) && u.push(f);\\n\\t\\treturn u;\\n\\t}\\n\\tfunction l(i, u) {\\n\\t\\tlet f = !1;\\n\\t\\tfor (let b of i) {\\n\\t\\t\\tif (u && g(b).then(l), !t.has(b))\\n\\t\\t\\t\\tcontinue;\\n\\t\\t\\tlet N = t.get(b);\\n\\t\\t\\tN.length_c && (b.dispatchEvent(new Event(y)), N.connected = /* @__PURE__ */ new WeakSet(), N.length_c = 0, N.length_d || t.delete(b), f = !0);\\n\\t\\t}\\n\\t\\treturn f;\\n\\t}\\n\\tfunction x(i, u) {\\n\\t\\tlet f = !1;\\n\\t\\tfor (let b of i)\\n\\t\\t\\tu && g(b).then(x), !(!t.has(b) || !t.get(b).length_d) && ((globalThis.queueMicrotask || setTimeout)(w(b)), f = !0);\\n\\t\\treturn f;\\n\\t}\\n\\tfunction w(i) {\\n\\t\\treturn () => {\\n\\t\\t\\ti.isConnected || (i.dispatchEvent(new Event(S)), t.delete(i));\\n\\t\\t};\\n\\t}\\n}\\n\\n// src/customElement.js\\nfunction Zt(t, e, n, r = yt) {\\n\\tm.push({\\n\\t\\tscope: t,\\n\\t\\thost: (...s) => s.length ? s.forEach((a) => a(t)) : t\\n\\t}), typeof r == \\\"function\\\" && (r = r.call(t, t));\\n\\tlet o = t[C];\\n\\to || wt(t);\\n\\tlet c = n.call(t, r);\\n\\treturn o || t.dispatchEvent(new Event(y)), e.nodeType === 11 && typeof e.mode == \\\"string\\\" && t.addEventListener(S, D.observe(e), { once: !0 }), m.pop(), e.append(c);\\n}\\nfunction wt(t) {\\n\\treturn J(t.prototype, \\\"connectedCallback\\\", function(e, n, r) {\\n\\t\\te.apply(n, r), n.dispatchEvent(new Event(y));\\n\\t}), J(t.prototype, \\\"disconnectedCallback\\\", function(e, n, r) {\\n\\t\\te.apply(n, r), (globalThis.queueMicrotask || setTimeout)(\\n\\t\\t\\t() => !n.isConnected && n.dispatchEvent(new Event(S))\\n\\t\\t);\\n\\t}), J(t.prototype, \\\"attributeChangedCallback\\\", function(e, n, r) {\\n\\t\\tlet [o, , c] = r;\\n\\t\\tn.dispatchEvent(new CustomEvent(P, {\\n\\t\\t\\tdetail: [o, c]\\n\\t\\t})), e.apply(n, r);\\n\\t}), t.prototype[C] = !0, t;\\n}\\nfunction J(t, e, n) {\\n\\tt[e] = new Proxy(t[e] || (() => {\\n\\t}), { apply: n });\\n}\\nfunction yt(t) {\\n\\treturn F(t, (e, n) => e.getAttribute(n));\\n}\\n\\n// src/events.js\\nfunction Qt(t, e, n) {\\n\\treturn e || (e = {}), function(o, ...c) {\\n\\t\\tn && (c.unshift(o), o = typeof n == \\\"function\\\" ? n() : n);\\n\\t\\tlet s = c.length ? new CustomEvent(t, Object.assign({ detail: c[0] }, e)) : new Event(t, e);\\n\\t\\treturn o.dispatchEvent(s);\\n\\t};\\n}\\nfunction O(t, e, n) {\\n\\treturn function(o) {\\n\\t\\treturn o.addEventListener(t, e, n), o;\\n\\t};\\n}\\nvar st = (t) => Object.assign({}, typeof t == \\\"object\\\" ? t : null, { once: !0 });\\nO.connected = function(t, e) {\\n\\treturn e = st(e), function(r) {\\n\\t\\treturn r.addEventListener(y, t, e), r[C] ? r : r.isConnected ? (r.dispatchEvent(new Event(y)), r) : (q(e.signal, () => D.offConnected(r, t)) && D.onConnected(r, t), r);\\n\\t};\\n};\\nO.disconnected = function(t, e) {\\n\\treturn e = st(e), function(r) {\\n\\t\\treturn r.addEventListener(S, t, e), r[C] || q(e.signal, () => D.offDisconnected(r, t)) && D.onDisconnected(r, t), r;\\n\\t};\\n};\\nvar Z = /* @__PURE__ */ new WeakMap();\\nO.disconnectedAsAbort = function(t) {\\n\\tif (Z.has(t))\\n\\t\\treturn Z.get(t);\\n\\tlet e = new AbortController();\\n\\treturn Z.set(t, e), t(O.disconnected(() => e.abort())), e;\\n};\\nvar _t = /* @__PURE__ */ new WeakSet();\\nO.attributeChanged = function(t, e) {\\n\\treturn typeof e != \\\"object\\\" && (e = {}), function(r) {\\n\\t\\tif (r.addEventListener(P, t, e), r[C] || _t.has(r) || !d.M)\\n\\t\\t\\treturn r;\\n\\t\\tlet o = new d.M(function(s) {\\n\\t\\t\\tfor (let { attributeName: a, target: h } of s)\\n\\t\\t\\t\\th.dispatchEvent(\\n\\t\\t\\t\\t\\tnew CustomEvent(P, { detail: [a, h.getAttribute(a)] })\\n\\t\\t\\t\\t);\\n\\t\\t});\\n\\t\\treturn q(e.signal, () => o.disconnect()) && o.observe(r, { attributes: !0 }), r;\\n\\t};\\n};\\n\\n// src/observables-lib.js\\nvar p = \\\"__dde_observable\\\";\\nfunction z(t) {\\n\\ttry {\\n\\t\\treturn T(t, p);\\n\\t} catch {\\n\\t\\treturn !1;\\n\\t}\\n}\\nvar H = [], v = /* @__PURE__ */ new WeakMap();\\nfunction E(t, e) {\\n\\tif (typeof t != \\\"function\\\")\\n\\t\\treturn it(!1, t, e);\\n\\tif (z(t))\\n\\t\\treturn t;\\n\\tlet n = it(!0), r = function() {\\n\\t\\tlet [o, ...c] = v.get(r);\\n\\t\\tif (v.set(r, /* @__PURE__ */ new Set([o])), H.push(r), dt(n, t()), H.pop(), !c.length)\\n\\t\\t\\treturn;\\n\\t\\tlet s = v.get(r);\\n\\t\\tfor (let a of c)\\n\\t\\t\\ts.has(a) || L(a, r);\\n\\t};\\n\\treturn v.set(n[p], r), v.set(r, /* @__PURE__ */ new Set([n])), r(), n;\\n}\\nE.action = function(t, e, ...n) {\\n\\tlet r = t[p], { actions: o } = r;\\n\\tif (!o || !(e in o))\\n\\t\\tthrow new Error(`'${t}' has no action with name '${e}'!`);\\n\\tif (o[e].apply(r, n), r.skip)\\n\\t\\treturn delete r.skip;\\n\\tr.listeners.forEach((c) => c(r.value));\\n};\\nE.on = function t(e, n, r = {}) {\\n\\tlet { signal: o } = r;\\n\\tif (!(o && o.aborted)) {\\n\\t\\tif (Array.isArray(e))\\n\\t\\t\\treturn e.forEach((c) => t(c, n, r));\\n\\t\\tQ(e, n), o && o.addEventListener(\\\"abort\\\", () => L(e, n));\\n\\t}\\n};\\nE.symbols = {\\n\\t//observable: mark,\\n\\tonclear: Symbol.for(\\\"Observable.onclear\\\")\\n};\\nE.clear = function(...t) {\\n\\tfor (let n of t) {\\n\\t\\tlet r = n[p];\\n\\t\\tr && (delete n.toJSON, r.onclear.forEach((o) => o.call(r)), e(n, r), delete n[p]);\\n\\t}\\n\\tfunction e(n, r) {\\n\\t\\tr.listeners.forEach((o) => {\\n\\t\\t\\tif (r.listeners.delete(o), !v.has(o))\\n\\t\\t\\t\\treturn;\\n\\t\\t\\tlet c = v.get(o);\\n\\t\\t\\tc.delete(n), !(c.size > 1) && (n.clear(...c), v.delete(o));\\n\\t\\t});\\n\\t}\\n};\\nvar R = \\\"__dde_reactive\\\";\\nE.el = function(t, e) {\\n\\tlet n = M.mark({ type: \\\"reactive\\\" }, !0), r = n.end, o = d.D.createDocumentFragment();\\n\\to.append(n, r);\\n\\tlet { current: c } = m, s = {}, a = (h) => {\\n\\t\\tif (!n.parentNode || !r.parentNode)\\n\\t\\t\\treturn L(t, a);\\n\\t\\tlet g = s;\\n\\t\\ts = {}, m.push(c);\\n\\t\\tlet l = e(h, function(u, f) {\\n\\t\\t\\tlet b;\\n\\t\\t\\treturn T(g, u) ? (b = g[u], delete g[u]) : b = f(), s[u] = b, b;\\n\\t\\t});\\n\\t\\tm.pop(), Array.isArray(l) || (l = [l]);\\n\\t\\tlet x = document.createComment(\\\"\\\");\\n\\t\\tl.push(x), n.after(...l);\\n\\t\\tlet w;\\n\\t\\tfor (; (w = x.nextSibling) && w !== r; )\\n\\t\\t\\tw.remove();\\n\\t\\tx.remove(), n.isConnected && At(c.host());\\n\\t};\\n\\treturn Q(t, a), ft(t, a, n, e), a(t()), o;\\n};\\nfunction At(t) {\\n\\t!t || !t[R] || (requestIdleCallback || setTimeout)(function() {\\n\\t\\tt[R] = t[R].filter(([e, n]) => n.isConnected ? !0 : (L(...e), !1));\\n\\t});\\n}\\nvar Ct = {\\n\\t_set(t) {\\n\\t\\tthis.value = t;\\n\\t}\\n};\\nfunction St(t) {\\n\\treturn function(e, n) {\\n\\t\\tlet r = (...c) => c.length ? e.setAttribute(n, ...c) : K(r), o = at(r, e.getAttribute(n), Ct);\\n\\t\\treturn t[n] = o, o;\\n\\t};\\n}\\nvar G = \\\"__dde_attributes\\\";\\nE.observedAttributes = function(t) {\\n\\tlet e = t[G] = {}, n = F(t, St(e));\\n\\treturn O.attributeChanged(function({ detail: o }) {\\n\\t\\t/*! This maps attributes to observables (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tlet [c, s] = o, a = this[G][c];\\n\\t\\tif (a)\\n\\t\\t\\treturn E.action(a, \\\"_set\\\", s);\\n\\t})(t), O.disconnected(function() {\\n\\t\\t/*! This removes all observables mapped to attributes (`O.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tE.clear(...Object.values(this[G]));\\n\\t})(t), n;\\n};\\nvar ut = {\\n\\tisObservable: z,\\n\\tprocessReactiveAttribute(t, e, n, r) {\\n\\t\\tif (!z(n))\\n\\t\\t\\treturn n;\\n\\t\\tlet o = (c) => {\\n\\t\\t\\tif (!t.isConnected)\\n\\t\\t\\t\\treturn L(n, o);\\n\\t\\t\\tr(e, c);\\n\\t\\t};\\n\\t\\treturn Q(n, o), ft(n, o, t, e), n();\\n\\t}\\n};\\nfunction ft(t, e, ...n) {\\n\\tlet { current: r } = m;\\n\\tr.prevent || r.host(function(o) {\\n\\t\\to[R] || (o[R] = [], O.disconnected(\\n\\t\\t\\t() => (\\n\\t\\t\\t\\t/*!\\n\\t\\t\\t\\t* Clears all Observables listeners added in the current scope/host (`O.el`, `assign`, …?).\\n\\t\\t\\t\\t* You can investigate the `__dde_reactive` key of the element.\\n\\t\\t\\t\\t* */\\n\\t\\t\\t\\to[R].forEach(([[c, s]]) => L(c, s, c[p] && c[p].host && c[p].host() === o))\\n\\t\\t\\t)\\n\\t\\t)(o)), o[R].push([[t, e], ...n]);\\n\\t});\\n}\\nfunction it(t, e, n) {\\n\\tlet r = t ? () => K(r) : (...o) => o.length ? dt(r, ...o) : K(r);\\n\\treturn at(r, e, n, t);\\n}\\nvar Dt = Object.assign(/* @__PURE__ */ Object.create(null), {\\n\\tstopPropagation() {\\n\\t\\tthis.skip = !0;\\n\\t}\\n}), V = class extends Error {\\n\\tconstructor() {\\n\\t\\tsuper();\\n\\t\\tlet [e, ...n] = this.stack.split(`\\n`), r = e.slice(e.indexOf(\\\"@\\\"), e.indexOf(\\\".js:\\\") + 4);\\n\\t\\tthis.stack = n.find((o) => !o.includes(r));\\n\\t}\\n};\\nfunction at(t, e, n, r = !1) {\\n\\tlet o = [];\\n\\tX(n) !== \\\"[object Object]\\\" && (n = {});\\n\\tlet { onclear: c } = E.symbols;\\n\\tn[c] && (o.push(n[c]), delete n[c]);\\n\\tlet { host: s } = m;\\n\\treturn Reflect.defineProperty(t, p, {\\n\\t\\tvalue: {\\n\\t\\t\\tvalue: e,\\n\\t\\t\\tactions: n,\\n\\t\\t\\tonclear: o,\\n\\t\\t\\thost: s,\\n\\t\\t\\tlisteners: /* @__PURE__ */ new Set(),\\n\\t\\t\\tdefined: new V().stack,\\n\\t\\t\\treadonly: r\\n\\t\\t},\\n\\t\\tenumerable: !1,\\n\\t\\twritable: !1,\\n\\t\\tconfigurable: !0\\n\\t}), t.toJSON = () => t(), t.valueOf = () => t[p] && t[p].value, Object.setPrototypeOf(t[p], Dt), t;\\n}\\nfunction Rt() {\\n\\treturn H[H.length - 1];\\n}\\nfunction K(t) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet { value: e, listeners: n } = t[p], r = Rt();\\n\\treturn r && n.add(r), v.has(r) && v.get(r).add(t), e;\\n}\\nfunction dt(t, e, n) {\\n\\tif (!t[p])\\n\\t\\treturn;\\n\\tlet r = t[p];\\n\\tif (!(!n && r.value === e))\\n\\t\\treturn r.value = e, r.listeners.forEach((o) => o(e)), e;\\n}\\nfunction Q(t, e) {\\n\\tif (t[p])\\n\\t\\treturn t[p].listeners.add(e);\\n}\\nfunction L(t, e, n) {\\n\\tlet r = t[p];\\n\\tif (!r)\\n\\t\\treturn;\\n\\tlet o = r.listeners.delete(e);\\n\\tif (n && !r.listeners.size) {\\n\\t\\tif (E.clear(t), !v.has(r))\\n\\t\\t\\treturn o;\\n\\t\\tlet c = v.get(r);\\n\\t\\tif (!v.has(c))\\n\\t\\t\\treturn o;\\n\\t\\tv.get(c).forEach((s) => L(s, c, !0));\\n\\t}\\n\\treturn o;\\n}\\n\\n// observables.js\\nB(ut);\\nexport {\\n\\tE as O,\\n\\tj as assign,\\n\\tnt as assignAttribute,\\n\\tht as chainableAppend,\\n\\tvt as classListDeclarative,\\n\\tM as createElement,\\n\\tqt as createElementNS,\\n\\tZt as customElementRender,\\n\\twt as customElementWithDDE,\\n\\tQt as dispatchEvent,\\n\\tM as el,\\n\\tqt as elNS,\\n\\tgt as elementAttribute,\\n\\tFt as empty,\\n\\tz as isObservable,\\n\\twt as lifecyclesToEvents,\\n\\tE as observable,\\n\\tyt as observedAttributes,\\n\\tO as on,\\n\\tB as registerReactivity,\\n\\tm as scope,\\n\\tWt as simulateSlots\\n};\\n\"}],\"toolbar\":false}"));</script><div class="notice"><!--<dde:mark type="component" name="mnemonic" host="parentElement" ssr/>--><h3 id="h-mnemonic"><!--<dde:mark type="component" name="h3" host="parentElement" ssr/>--><a href="#h-mnemonic" tabindex="-1">#</a> Mnemonic</h3><ul><li><code>on(&lt;event&gt;, &lt;listener&gt;[, &lt;options&gt;])(&lt;element&gt;)</code> — just <code>&lt;element&gt;.addEventListener(&lt;event&gt;, &lt;listener&gt;[, &lt;options&gt;])</code></li><li><code>on.&lt;live-cycle&gt;(&lt;event&gt;, &lt;listener&gt;[, &lt;options&gt;])(&lt;element&gt;)</code> — corresponds to custom elemnets callbacks <code>&lt;live-cycle&gt;Callback(...){...}</code>. To connect to custom element see following page, else it is simulated by MutationObserver.</li><li><code>dispatchEvent(&lt;event&gt;[, &lt;options&gt;])(element)</code> — just <code>&lt;element&gt;.dispatchEvent(new Event(&lt;event&gt;[, &lt;options&gt;]))</code></li><li><code>dispatchEvent(&lt;event&gt;[, &lt;options&gt;])(element, detail)</code> — just <code>&lt;element&gt;.dispatchEvent(new CustomEvent(&lt;event&gt;, { detail, ...&lt;options&gt; }))</code></li></ul></div><div class="prevNext"><!--<dde:mark type="component" name="prevNext" host="parentElement" ssr/>--><a rel="prev" href="p02-elements" title="Basic concepts of elements modifications and creations."><!--<dde:mark type="component" name="pageLink" host="parentElement" ssr/>-->Elements (previous)</a><a rel="next" href="p04-observables" title="Handling reactivity in UI via observables."><!--<dde:mark type="component" name="pageLink" host="parentElement" ssr/>-->(next) Observables and reactivity</a></div></main></body></html>
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