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🔤 intro

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Jan Andrle
2025-03-05 15:29:53 +01:00
parent 9ed6de2f8a
commit 8f0879196f
6 changed files with 247 additions and 119 deletions
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14
docs/components/examples/introducing/3ps-before.js Normal file
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@ -0,0 +1,14 @@
// pseudocode
// Mixed concerns make code hard to maintain
const button = document.querySelector('button');
let count = 0;
button.addEventListener('click', () => {
count++;
document.querySelector('p').textContent =
'Clicked ' + count + ' times';
if (count > 10) {
button.disabled = true;
}
});

20
docs/components/examples/introducing/3ps.js
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@ -1,6 +1,14 @@
// pseudo code!
const onchage=
event=>
console.log("Reacting to the:", event); // A
input.addEventListener("change", onchange); // B
input.dispatchEvent(new Event("change")); // C
// pseudocode
// 1. Create state
const count = S(0);
// 2. React to state changes
S.on(count, value => {
updateUI(value);
if (value > 10) disableButton();
});
// 3. Update state on events
button.addEventListener('click', () => {
count.set(count.get() + 1);
});

45
docs/components/examples/introducing/helloWorld.js
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@ -1,19 +1,30 @@
import { el } from "deka-dom-el";
import { el, on } from "deka-dom-el";
import { S } from "deka-dom-el/signals";
const threePS= ({ emoji= "🚀" })=> {
const clicks= S(0); // A
return el().append(
el("p", S(()=>
"Hello World "+emoji.repeat(clicks.get()) // B
)),
el("button", {
type: "button",
onclick: ()=> clicks.set(clicks.get()+1), // C
textContent: "Fire",
})
);
};
document.body.append(
el(threePS, { emoji: "🎉" }),
);
// A HelloWorld component using the 3PS pattern
function HelloWorld({ emoji = "🚀" }) {
// PART 1: Create reactive state
const clicks = S(0);
return el().append(
// PART 2: Bind state to UI elements
el("p", {
className: "greeting",
// This paragraph automatically updates when clicks changes
textContent: S(() => `Hello World ${emoji.repeat(clicks.get())}`)
}),
// PART 3: Update state in response to events
el("button", {
type: "button",
textContent: "Add emoji",
// When clicked, update the state
onclick: () => clicks.set(clicks.get() + 1)
})
);
}
// Use the component in your app
document.body.append(
el(HelloWorld, { emoji: "🎉" })
);

95
docs/index.html.js
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@ -2,7 +2,7 @@ import { t, T } from "./utils/index.js";
export const info= {
href: "./",
title: t`Introduction`,
description: t`Introducing a library.`,
description: t`A lightweight, reactive DOM library for creating dynamic UIs with a declarative syntax`,
};
import { el } from "deka-dom-el";
@ -26,37 +26,86 @@ const references= {
export function page({ pkg, info }){
const page_id= info.id;
return el(simplePage, { info, pkg }).append(
el("p", t`The library tries to provide pure JavaScript tool(s) to create reactive interfaces using …`),
el(h3, t`Event-driven programming (3 parts separation ≡ 3PS)`),
el("p").append(t`
Let's introduce the basic principle on which the library is built. We'll use the JavaScript listener as
a starting point.
`),
el(code, { src: fileURL("./components/examples/introducing/3ps.js"), page_id }),
el("h2", t`Vanilla for flavouring — a full-fledged feast for large projects`),
el("p").append(...T`
As we can see, in the code at location “A” we define ${el("em", t`how to react`)} when the function
is called with any event as an argument. At that moment, we ${el("em", t`don’t care who/why/how`)}
the function was called. Similarly, at point “B”, we reference to a function to be called on the event
${el("em", t`without caring`)} 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 ${el("em", t`don't care if/how someone`)}
is listening for the event.
Welcome to Deka DOM Elements (DDE) — a lightweight library for building dynamic UIs with a
declarative syntax that stays close to the native DOM API. DDE gives you powerful reactive
tools without the complexity and overhead of larger frameworks.
`),
el("div", { className: "callout" }).append(
el("h4", t`What Makes DDE Special`),
el("ul").append(
el("li", t`No build step required — use directly in the browser`),
el("li", t`Lightweight core (~10-15kB minified) with zero dependencies`),
el("li", t`Natural DOM API — work with real DOM nodes, not abstractions`),
el("li", t`Built-in reactivity with powerful signals system`),
el("li", t`Clean code organization with the 3PS pattern`)
)
),
el(example, { src: fileURL("./components/examples/introducing/helloWorld.js"), page_id }),
el(h3, t`The 3PS Pattern: A Better Way to Build UIs`),
el("p").append(...T`
The library introduces a new “type” of variable/constant called ${el("em", t`signal`)} allowing us to
to use introduced 3PS pattern in our applications. As you can see it in the example above.
At the heart of DDE is the 3PS (3-Part Separation) pattern. This simple yet powerful approach helps you
organize your UI code into three distinct areas, making your applications more maintainable and easier to reason about.
`),
el("div", { className: "illustration" }).append(
el("div", { className: "tabs" }).append(
el("div", { className: "tab" }).append(
el("h5", t`Traditional DOM Manipulation`),
el(code, { src: fileURL("./components/examples/introducing/3ps-before.js"), page_id }),
),
el("div", { className: "tab" }).append(
el("h5", t`DDE's 3PS Pattern`),
el(code, { src: fileURL("./components/examples/introducing/3ps.js"), page_id }),
)
)
),
el("p").append(...T`
Also please notice that there is very similar 3PS pattern used for separate creation of UI and
business logic.
The 3PS pattern separates your code into three clear parts:
`),
el("ol").append(
el("li").append(...T`
${el("strong", "Create State")}: Define your application's reactive data using signals
`),
el("li").append(...T`
${el("strong", "Bind to Elements")}: Define how UI elements react to state changes
`),
el("li").append(...T`
${el("strong", "Update State")}: Modify state in response to user events or other triggers
`)
),
el("p").append(...T`
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 ${el("a", { textContent: t`MVVM`, ...references.w_mvv })}
or ${el("a", { textContent: t`MVC`, ...references.w_mvc })}.
By separating these concerns, your code becomes more modular, testable, and easier to maintain. This approach
shares principles with more formal patterns like ${el("a", { textContent: "MVVM", ...references.w_mvv })} and
${el("a", { textContent: "MVC", ...references.w_mvc })}, but with less overhead and complexity.
`),
el(h3, t`Organization of the documentation`),
el("div", { className: "note" }).append(
el("p").append(...T`
The 3PS pattern becomes especially powerful when combined with components, allowing you to create
reusable pieces of UI with encapsulated state and behavior. You'll learn more about this in the
following sections.
`)
),
el(h3, t`How to Use This Documentation`),
el("p").append(...T`
This guide will take you through DDE's features step by step:
`),
el("ol").append(
el("li").append(...T`${el("strong", "Elements")} — Creating and manipulating DOM elements`),
el("li").append(...T`${el("strong", "Events")} — Handling user interactions and lifecycle events`),
el("li").append(...T`${el("strong", "Signals")} — Adding reactivity to your UI`),
el("li").append(...T`${el("strong", "Scopes")} — Managing component lifecycles`),
el("li").append(...T`${el("strong", "Custom Elements")} — Building web components`),
el("li").append(...T`${el("strong", "Debugging")} — Tools to help you build and fix your apps`),
el("li").append(...T`${el("strong", "SSR")} — Server-side rendering with DDE`)
),
el("p").append(...T`
Each section builds on the previous ones, so we recommend following them in order.
Let's get started with the basics of creating elements!
`),
);
}