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22 lines
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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="Introducing a library."><title>`deka-dom-el` — Introduction</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` — Introduction</h1><p>Introducing a library.</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 library." class="current">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.">3. Events and Addons</a><a href="p04-signals" title="Handling reactivity in UI via signals.">4. Signals 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><p>The library tries to provide pure JavaScript tool(s) to create reactive interfaces using …</p><h3 id="h-event-driven-programming--parts-separation--ps"><!--<dde:mark type="component" name="h3" host="parentElement" ssr/>--><a href="#h-event-driven-programming--parts-separation--ps" tabindex="-1">#</a> Event-driven programming (3 parts separation ≡ 3PS)</h3><p>Let's introduce the basic principle on which the library is built. We'll use the JavaScript listener as a starting point. </p><div class="code" data-js="todo"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">// pseudo code!
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const onchage=
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event=>
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console.log("Reacting to the:", event); // A
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input.addEventListener("change", onchange); // B
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input.dispatchEvent(new Event("change")); // C
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</code></div><p>As we can see, in the code at location “A” we define <em>how to react</em> when the function is called with any event as an argument. At that moment, we <em>don't care who/why/how</em> the function was called. Similarly, at point “B”, we reference to a function to be called on the event <em>without caring</em> what the function will do at that time. Finally, at point “C”, we tell the application that a change has occurred, in the input, and we <em>don't care if/how someone</em> is listening for the event.</p><!--<dde:mark type="component" name="example" host="this" ssr/>--><div id="code-example-1-8meex5b3tyo" class="example"><!--<dde:mark type="component" name="code" host="parentElement" ssr/>--><code class="language-js">import { el } from "./esm-with-signals.js";
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import { S } from "./esm-with-signals.js";
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const clicks= S(0); // A
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document.body.append(
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el().append(
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el("p", S(()=>
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"Hello World "+"🎉".repeat(clicks()) // B
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)),
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el("button", {
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type: "button",
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onclick: ()=> clicks(clicks()+1), // C
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textContent: "Fire",
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})
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)
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);
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</code></div><script>Flems(document.getElementById("code-example-1-8meex5b3tyo"), JSON.parse("{\"files\":[{\"name\":\".js\",\"content\":\"import { el } from \\\"./esm-with-signals.js\\\";\\nimport { S } from \\\"./esm-with-signals.js\\\";\\nconst clicks= S(0); // A\\ndocument.body.append(\\n\\tel().append(\\n\\t\\tel(\\\"p\\\", S(()=>\\n\\t\\t\\t\\\"Hello World \\\"+\\\"🎉\\\".repeat(clicks()) // B\\n\\t\\t)),\\n\\t\\tel(\\\"button\\\", {\\n\\t\\t\\ttype: \\\"button\\\",\\n\\t\\t\\tonclick: ()=> clicks(clicks()+1), // C\\n\\t\\t\\ttextContent: \\\"Fire\\\",\\n\\t\\t})\\n\\t)\\n);\\n\"},{\"name\":\"esm-with-signals.js\",\"content\":\"// src/signals-common.js\\nvar k = {\\n\\tisSignal(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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i.forEach((a) => a(t)) : t\\n\\t}), typeof r == \\\"function\\\" && (r = r.call(t, t));\\n\\tlet o = t[C];\\n\\to || yt(t);\\n\\tlet c = n.call(t, r);\\n\\treturn o || t.dispatchEvent(new Event(_)), e.nodeType === 11 && typeof e.mode == \\\"string\\\" && t.addEventListener(O, D.observe(e), { once: !0 }), m.pop(), e.append(c);\\n}\\nfunction yt(t) {\\n\\treturn J(t.prototype, \\\"connectedCallback\\\", function(e, n, r) {\\n\\t\\te.apply(n, r), n.dispatchEvent(new Event(_));\\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(O))\\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(M, {\\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 _t(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 i = c.length ? new CustomEvent(t, Object.assign({ detail: c[0] }, e)) : new Event(t, e);\\n\\t\\treturn o.dispatchEvent(i);\\n\\t};\\n}\\nfunction w(t, e, n) {\\n\\treturn function(o) {\\n\\t\\treturn o.addEventListener(t, e, n), o;\\n\\t};\\n}\\nvar it = (t) => Object.assign({}, typeof t == \\\"object\\\" ? t : null, { once: !0 });\\nw.connected = function(t, e) {\\n\\treturn e = it(e), function(r) {\\n\\t\\treturn r.addEventListener(_, t, e), r[C] ? r : r.isConnected ? (r.dispatchEvent(new Event(_)), r) : (q(e.signal, () => D.offConnected(r, t)) && D.onConnected(r, t), r);\\n\\t};\\n};\\nw.disconnected = function(t, e) {\\n\\treturn e = it(e), function(r) {\\n\\t\\treturn r.addEventListener(O, t, e), r[C] || q(e.signal, () => D.offDisconnected(r, t)) && D.onDisconnected(r, t), r;\\n\\t};\\n};\\nvar Z = /* @__PURE__ */ new WeakMap();\\nw.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(w.disconnected(() => e.abort())), e;\\n};\\nvar At = /* @__PURE__ */ new WeakSet();\\nw.attributeChanged = function(t, e) {\\n\\treturn typeof e != \\\"object\\\" && (e = {}), function(r) {\\n\\t\\tif (r.addEventListener(M, t, e), r[C] || At.has(r) || !d.M)\\n\\t\\t\\treturn r;\\n\\t\\tlet o = new d.M(function(i) {\\n\\t\\t\\tfor (let { attributeName: a, target: h } of i)\\n\\t\\t\\t\\th.dispatchEvent(\\n\\t\\t\\t\\t\\tnew CustomEvent(M, { 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/signals-lib.js\\nvar p = \\\"__dde_signal\\\";\\nfunction z(t) {\\n\\ttry {\\n\\t\\treturn T(t, p);\\n\\t} catch {\\n\\t\\treturn !1;\\n\\t}\\n}\\nvar H = [], g = /* @__PURE__ */ new WeakMap();\\nfunction E(t, e) {\\n\\tif (typeof t != \\\"function\\\")\\n\\t\\treturn st(!1, t, e);\\n\\tif (z(t))\\n\\t\\treturn t;\\n\\tlet n = st(!0), r = function() {\\n\\t\\tlet [o, ...c] = g.get(r);\\n\\t\\tif (g.set(r, /* @__PURE__ */ new Set([o])), H.push(r), dt(n, t()), H.pop(), !c.length)\\n\\t\\t\\treturn;\\n\\t\\tlet i = g.get(r);\\n\\t\\tfor (let a of c)\\n\\t\\t\\ti.has(a) || L(a, r);\\n\\t};\\n\\treturn g.set(n[p], r), g.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//signal: mark,\\n\\tonclear: Symbol.for(\\\"Signal.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), !g.has(o))\\n\\t\\t\\t\\treturn;\\n\\t\\t\\tlet c = g.get(o);\\n\\t\\t\\tc.delete(n), !(c.size > 1) && (n.clear(...c), g.delete(o));\\n\\t\\t});\\n\\t}\\n};\\nvar R = \\\"__dde_reactive\\\";\\nE.el = function(t, e) {\\n\\tlet n = j.mark({ type: \\\"reactive\\\" }, !0), r = n.end, o = d.D.createDocumentFragment();\\n\\to.append(n, r);\\n\\tlet { current: c } = m, i = {}, a = (h) => {\\n\\t\\tif (!n.parentNode || !r.parentNode)\\n\\t\\t\\treturn L(t, a);\\n\\t\\tlet v = i;\\n\\t\\ti = {}, m.push(c);\\n\\t\\tlet l = e(h, function(u, f) {\\n\\t\\t\\tlet b;\\n\\t\\t\\treturn T(v, u) ? (b = v[u], delete v[u]) : b = f(), i[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 y;\\n\\t\\tfor (; (y = x.nextSibling) && y !== r; )\\n\\t\\t\\ty.remove();\\n\\t\\tx.remove(), n.isConnected && St(c.host());\\n\\t};\\n\\treturn Q(t, a), ft(t, a, n, e), a(t()), o;\\n};\\nfunction St(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 Ot(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, Ot(e));\\n\\treturn w.attributeChanged(function({ detail: o }) {\\n\\t\\t/*! This maps attributes to signals (`S.observedAttributes`).\\n\\t\\t\\t* Investigate `__dde_attributes` key of the element.*/\\n\\t\\tlet [c, i] = o, a = this[G][c];\\n\\t\\tif (a)\\n\\t\\t\\treturn E.action(a, \\\"_set\\\", i);\\n\\t})(t), w.disconnected(function() {\\n\\t\\t/*! This removes all signals mapped to attributes (`S.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\\tisSignal: 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] = [], w.disconnected(\\n\\t\\t\\t() => (\\n\\t\\t\\t\\t/*!\\n\\t\\t\\t\\t* Clears all Signals listeners added in the current scope/host (`S.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, i]]) => L(c, i, 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 st(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: i } = 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: i,\\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), g.has(r) && g.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), !g.has(r))\\n\\t\\t\\treturn o;\\n\\t\\tlet c = g.get(r);\\n\\t\\tif (!g.has(c))\\n\\t\\t\\treturn o;\\n\\t\\tg.get(c).forEach((i) => L(i, c, !0));\\n\\t}\\n\\treturn o;\\n}\\n\\n// signals.js\\nB(ut);\\nexport {\\n\\tE as S,\\n\\tP as assign,\\n\\tnt as assignAttribute,\\n\\tht as chainableAppend,\\n\\tgt as classListDeclarative,\\n\\tj as createElement,\\n\\tqt as createElementNS,\\n\\tZt as customElementRender,\\n\\tyt as customElementWithDDE,\\n\\tQt as dispatchEvent,\\n\\tj as el,\\n\\tqt as elNS,\\n\\tvt as elementAttribute,\\n\\tFt as empty,\\n\\tz as isSignal,\\n\\tyt as lifecyclesToEvents,\\n\\t_t as observedAttributes,\\n\\tw as on,\\n\\tB as registerReactivity,\\n\\tm as scope,\\n\\tE as signal,\\n\\tWt as simulateSlots\\n};\\n\"}],\"toolbar\":false}"));</script><p>The library introduces a new “type” of variable/constant called <em>signal</em> allowing us to to use introduced 3PS pattern in our applications. As you can see it in the example above.</p><p>Also please notice that there is very similar 3PS pattern used for separate creation of UI and business logic. </p><p>The 3PS is very simplified definition of the pattern. There are more deep/academic definitions more precisely describe usage in specific situations, see for example <a title="Wikipedia: Model–view–viewmodel" href="https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93viewmodel">MVVM</a> or <a title="Wikipedia: Model–view–controller" href="https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller">MVC</a>.</p><h3 id="h-organization-of-the-documentation"><!--<dde:mark type="component" name="h3" host="parentElement" ssr/>--><a href="#h-organization-of-the-documentation" tabindex="-1">#</a> Organization of the documentation</h3><div class="prevNext"><!--<dde:mark type="component" name="prevNext" host="parentElement" ssr/>--><!--<dde:mark type="component" name="pageLink" host="this" ssr/>--><a rel="next" href="p02-elements" title="Basic concepts of elements modifications and creations."><!--<dde:mark type="component" name="pageLink" host="parentElement" ssr/>-->(next) Elements</a></div></main></body></html> |