diff --git a/README.md b/README.md index e69de29..cbdd069 100644 --- a/README.md +++ b/README.md @@ -0,0 +1,126 @@ +# ToDo-App – React Beispiel + +Einfache ToDo-Web-App für den Frontend-Unterricht. +Gebaut mit **React 18** und **Vite** – läuft vollständig im Browser, kein eigener Server nötig. + +--- + +## Projektstruktur + +``` +WebDev-React-ToDo-Example/ +├── index.html # HTML-Einstiegspunkt (Root-Element für React) +├── vite.config.js # Vite Build-Tool Konfiguration +├── package.json # Abhängigkeiten und npm-Scripts +└── src/ + ├── main.jsx # React-Einstiegspunkt (createRoot) + ├── App.jsx # Haupt-Komponente (State, Effekte, Handler) + ├── api.js # API-Service (alle fetch()-Aufrufe) + ├── index.css # Globales Stylesheet (kein Framework) + └── components/ + ├── TodoForm.jsx # Formular: neues ToDo erstellen + ├── TodoList.jsx # Liste + Pagination + └── TodoItem.jsx # Einzelnes ToDo (Checkbox, Löschen) +``` + +--- + +## Erste Schritte + +```bash +# 1. Abhängigkeiten installieren +npm install + +# 2. Entwicklungsserver starten (mit Hot Reload) +npm run dev + +# 3. Produktions-Build erstellen +npm run build +``` + +Nach `npm run dev` ist die App unter **http://localhost:5173** erreichbar. + +--- + +## Verwendete Technologien + +| Technologie | Zweck | +|---|---| +| [React 18](https://react.dev) | UI-Bibliothek (Komponenten, State, Hooks) | +| [Vite](https://vitejs.dev) | Build-Tool & Dev-Server | +| Fetch API (Browser built-in) | HTTP-Anfragen an die REST-API | +| CSS (vanilla) | Styling ohne externe Bibliotheken | + +--- + +## API + +Die App kommuniziert mit der REST-API unter: + +``` +https://webdev.iten-web.ch/10003/api/ +``` + +Die App verwendet **Best-Practice-Routing mit REST-Pfaden**. + +| Methode | URL | Beschreibung | +|---|---|---| +| GET | `/todos?page=1&limit=10` | Liste abrufen (paginiert) | +| POST | `/todos` | Neues ToDo erstellen | +| PATCH | `/todos/{id}` | Felder teilweise aktualisieren | +| DELETE | `/todos/{id}` | ToDo löschen | + +Alle API-Aufrufe sind in `src/api.js` gekapselt. + +--- + +## Automatisches Aktualisieren (Polling) + +Die App lädt die aktuell sichtbare Seite **alle 5 Sekunden** automatisch neu. + +- Intervall: `5000 ms` in `src/App.jsx` +- Technik: `setInterval(...)` in einem `useEffect(...)` +- Cleanup: `clearInterval(...)`, damit beim Unmount keine Hintergrund-Timer aktiv bleiben + +Damit unnötige Re-Renders vermieden werden, vergleicht die App die neu geladenen ToDos +mit den bereits angezeigten Daten (`areTodosEqual`). + +- **Keine Änderung**: State bleibt unverändert, DOM bleibt wie es ist +- **Änderung vorhanden**: State wird aktualisiert, React rendert die betroffenen Elemente neu + +--- + +## Wichtige React-Konzepte im Code + +### Komponenten +Jede `.jsx`-Datei exportiert eine Funktion, die JSX zurückgibt. +JSX ist eine HTML-ähnliche Syntax, die zu `React.createElement()`-Aufrufen kompiliert wird. + +### Props +Daten fliessen von Eltern- zu Kindkomponenten über Props (Parameter der Funktion): +```jsx + +``` + +### State (`useState`) +Lokaler Zustand einer Komponente. Ändert sich der State, rendert React die Komponente neu: +```jsx +const [todos, setTodos] = useState([]) +``` + +### Effekte (`useEffect`) +Seiteneffekte (z.B. API-Aufruf) nach dem Render ausführen: +```jsx +useEffect(() => { + loadTodos() +}, [page]) // läuft neu, wenn sich `page` ändert +``` + +### Datenfluss +``` +App (State) + ↓ Props +TodoList → TodoItem + ↑ Callbacks (onToggle, onDelete) +App (State aktualisieren) +``` diff --git a/dist/assets/index-BLMhEhhy.js b/dist/assets/index-BLMhEhhy.js new file mode 100644 index 0000000..81011d6 --- /dev/null +++ b/dist/assets/index-BLMhEhhy.js @@ -0,0 +1,40 @@ +(function(){const t=document.createElement("link").relList;if(t&&t.supports&&t.supports("modulepreload"))return;for(const l of document.querySelectorAll('link[rel="modulepreload"]'))r(l);new MutationObserver(l=>{for(const u of l)if(u.type==="childList")for(const o of u.addedNodes)o.tagName==="LINK"&&o.rel==="modulepreload"&&r(o)}).observe(document,{childList:!0,subtree:!0});function n(l){const u={};return 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"dev": "vite", + "build": "vite build", + "preview": "vite preview" + }, + "dependencies": { + "react": "^18.3.1", + "react-dom": "^18.3.1" + }, + "devDependencies": { + "@vitejs/plugin-react": "^4.3.1", + "vite": "^5.4.0" + } +} diff --git a/src/App.jsx b/src/App.jsx new file mode 100644 index 0000000..107721b --- /dev/null +++ b/src/App.jsx @@ -0,0 +1,243 @@ +/** + * App.jsx – Haupt-Komponente der ToDo-App + * ========================================= + * + * Diese Komponente ist die "Schaltzentrale" der Anwendung. + * Sie ist verantwortlich für: + * + * 1. STATE verwalten: Welche Daten existieren und wie ist der aktuelle Zustand? + * 2. EFFEKTE auslösen: Wann sollen Daten von der API geladen werden? + * 3. HANDLER definieren: Was passiert bei Benutzeraktionen (Hinzufügen, Löschen …)? + * 4. RENDER: Kindkomponenten mit Daten und Callbacks versorgen. + * + * Datenfluss in React: + * App (State) → Props → Kindkomponenten + * Kindkomponenten → Callbacks → App (State ändern) + */ +import { useState, useEffect, useCallback } from 'react' +import { fetchTodos, createTodo, patchTodo, deleteTodo } from './api' +import TodoForm from './components/TodoForm' +import TodoList from './components/TodoList' +import './index.css' + +/** Anzahl ToDos pro Seite (an API und Pagination-Logik weitergegeben) */ +const LIMIT = 10 + +/** Polling-Intervall in Millisekunden (5000 ms = 5 Sekunden) */ +const POLL_INTERVAL_MS = 5000 + +/** + * Vergleicht zwei Todo-Arrays auf inhaltliche Gleichheit. + * + * Wenn sich nichts geändert hat, behalten wir den bisherigen State bei. + * Dadurch vermeiden wir unnötige Re-Renders und React muss das DOM nicht neu anpassen. + */ +function areTodosEqual(listA, listB) { + if (listA.length !== listB.length) return false + + for (let i = 0; i < listA.length; i += 1) { + const a = listA[i] + const b = listB[i] + + if ( + a.id !== b.id || + a.userId !== b.userId || + a.title !== b.title || + a.completed !== b.completed + ) { + return false + } + } + + return true +} + +function App() { + // ========================================================== + // STATE + // ========================================================== + // useState(initialWert) → [aktueller Wert, Setter-Funktion] + // Beim Aufruf des Setters rendert React die Komponente neu. + + /** Array der aktuell angezeigten ToDo-Objekte */ + const [todos, setTodos] = useState([]) + + /** Aktuelle Seitennummer für die Pagination (beginnt bei 1) */ + const [page, setPage] = useState(1) + + /** true, solange eine API-Anfrage läuft */ + const [loading, setLoading] = useState(false) + + /** Fehlermeldung als String, oder null wenn kein Fehler */ + const [error, setError] = useState(null) + + // ========================================================== + // Zentrale Ladefunktion + // ========================================================== + /** + * Lädt die aktuelle Seite von der API. + * showLoading=true zeigt den Ladezustand (für initiales Laden / Seitenwechsel), + * beim Polling lassen wir den Ladezustand aus, damit die UI nicht flackert. + */ + const loadTodos = useCallback(async ({ showLoading = false } = {}) => { + if (showLoading) setLoading(true) + + try { + const data = await fetchTodos(page, LIMIT) + + // Vergleich mit aktuell dargestellten Daten (virtuelles DOM / State). + // Nur wenn sich Inhalte unterscheiden, wird der State ersetzt. + setTodos((prev) => (areTodosEqual(prev, data) ? prev : data)) + setError(null) + } catch (err) { + setError(err.message) + } finally { + if (showLoading) setLoading(false) + } + }, [page]) + + // ========================================================== + // EFFEKT 1: Initiales Laden + Laden bei Seitenwechsel + // ========================================================== + useEffect(() => { + loadTodos({ showLoading: true }) + }, [loadTodos]) + + // ========================================================== + // EFFEKT 2: Polling alle 5 Sekunden + // ========================================================== + /** + * Lädt periodisch nach und vergleicht mit dem aktuellen State. + * Änderungen am Backend werden dadurch zeitnah in der UI sichtbar. + */ + useEffect(() => { + const intervalId = setInterval(() => { + loadTodos() + }, POLL_INTERVAL_MS) + + // Cleanup verhindert Memory-Leaks beim Unmount oder Seitenwechsel. + return () => clearInterval(intervalId) + }, [loadTodos]) + + // ========================================================== + // HANDLER + // ========================================================== + + /** + * handleAdd – Neues ToDo über die API erstellen (POST). + * Wird als onAdd-Prop an weitergegeben. + * + * Nach dem Erstellen wird die Seite neu geladen, indem wir + * auf Seite 1 zurückspringen (löst den useEffect erneut aus). + * + * @param {{ userId: number, title: string }} newTodo + */ + async function handleAdd(newTodo) { + setError(null) + try { + await createTodo(newTodo) + // Zurück auf Seite 1. Falls wir bereits auf Seite 1 sind, + // laden wir die Daten direkt neu. + if (page === 1) { + await loadTodos({ showLoading: true }) + } else { + setPage(1) + } + } catch (err) { + setError(err.message) + } + } + + /** + * handleToggle – completed-Status eines ToDos umschalten (PATCH). + * Wird als onToggle-Prop an → weitergegeben. + * + * Statt die ganze Liste neu zu laden, aktualisieren wir nur das + * betroffene Element im lokalen State (optimistic / lokal). + * + * @param {number} id - ID des ToDos + * @param {boolean} completed - Neuer Status + */ + async function handleToggle(id, completed) { + setError(null) + try { + const updated = await patchTodo(id, { completed }) + // todos.map() erstellt ein NEUES Array (State darf nie direkt mutiert werden!) + // Nur das geänderte Element wird durch das aktualisierte ersetzt. + setTodos((prev) => + prev.map((t) => (t.id === id ? { ...t, completed: updated.completed } : t)) + ) + } catch (err) { + setError(err.message) + } + } + + /** + * handleDelete – ToDo über die API löschen (DELETE). + * Wird als onDelete-Prop an → weitergegeben. + * + * Nach erfolgreichem Löschen wird das Element lokal aus dem State entfernt. + * + * @param {number} id - ID des zu löschenden ToDos + */ + async function handleDelete(id) { + setError(null) + try { + await deleteTodo(id) + // filter() erstellt ein neues Array ohne das gelöschte Element + setTodos((prev) => prev.filter((t) => t.id !== id)) + } catch (err) { + setError(err.message) + } + } + + // --- Pagination-Handler --- + + /** Eine Seite zurück (Minimum: Seite 1) */ + function handlePrev() { + setPage((p) => Math.max(1, p - 1)) + } + + /** Eine Seite vor */ + function handleNext() { + setPage((p) => p + 1) + } + + // ========================================================== + // RENDER + // ========================================================== + // JSX: HTML-ähnliche Syntax, die Vite/Babel zu React.createElement() kompiliert. + // Ausdrücke in { } werden als JavaScript ausgewertet. + + return ( +
+

ToDo-App

+

React + Vite · REST API Demo

+ + {/* Formular zum Erstellen eines neuen ToDos */} + + + {/* Fehlermeldung anzeigen (nur wenn error nicht null ist) */} + {error &&

⚠ {error}

} + + {/* Ladeindikator ODER die Liste anzeigen */} + {loading ? ( +

Lädt …

+ ) : ( + + )} +
+ ) +} + +export default App diff --git a/src/api.js b/src/api.js new file mode 100644 index 0000000..f2d1c66 --- /dev/null +++ b/src/api.js @@ -0,0 +1,203 @@ +/** + * api.js – Zentraler Service für alle API-Aufrufe + * ================================================ + * + * Dieses Modul kapselt die gesamte Kommunikation mit der REST-API. + * Die UI-Komponenten importieren nur die benötigten Funktionen – + * sie müssen nicht wissen, wie die Fetch-Aufrufe intern funktionieren. + * + * API-Basis: https://webdev.iten-web.ch/10003/api + * + * Best-Practice-Routing mit REST-Pfaden: + * GET https://webdev.iten-web.ch/10003/api/todos?page=1&limit=10 + * GET https://webdev.iten-web.ch/10003/api/todos/42 + */ + +/** Basis-URL der API – hier zentral änderbar */ +const BASE_URL = 'https://webdev.iten-web.ch/10003/api' + +/** + * buildUrl – Erstellt eine vollständige Anfrage-URL. + * + * @param {string} path - API-Pfad, z.B. "/todos" oder "/todos/5" + * @param {object} [params] - Optionale Query-Parameter als Schlüssel-Wert-Objekt + * @returns {string} - Fertige URL als String + * + * Beispiel: + * buildUrl('/todos', { page: 2, limit: 10 }) + * → "https://webdev.iten-web.ch/10003/api/todos?page=2&limit=10" + */ +function buildUrl(path, params = {}) { + const normalizedPath = path.startsWith('/') ? path : `/${path}` + const url = new URL(`${BASE_URL}${normalizedPath}`) + + // Weitere Parameter anhängen (leere Werte werden übersprungen) + for (const [key, value] of Object.entries(params)) { + if (value !== undefined && value !== '') { + url.searchParams.set(key, value) + } + } + + return url.toString() +} + +// ============================================================= +// GET /todos – Liste abrufen (mit Pagination) +// ============================================================= + +/** + * fetchTodos – Ruft eine paginierte Liste von ToDos ab. + * + * @param {number} [page=1] - Seitennummer (1-basiert) + * @param {number} [limit=10] - Anzahl Einträge pro Seite + * @returns {Promise} - Array von Todo-Objekten + * + * Todo-Objekt: { id, userId, title, completed } + */ +export async function fetchTodos(page = 1, limit = 10) { + const url = buildUrl('/todos', { page, limit }) + const response = await fetch(url) + + // HTTP-Fehler (4xx, 5xx) werden von fetch() NICHT automatisch geworfen – + // wir prüfen response.ok manuell und werfen ggf. einen Fehler + if (!response.ok) { + throw new Error(`Fehler beim Laden der ToDos (HTTP ${response.status})`) + } + + // response.json() liest den Response-Body und parst ihn als JSON + return response.json() +} + +// ============================================================= +// GET /todos/{id} – Einzelnes ToDo abrufen +// ============================================================= + +/** + * fetchTodoById – Ruft ein einzelnes ToDo per ID ab. + * + * @param {number} id - ID des gesuchten ToDos + * @returns {Promise} - Todo-Objekt + */ +export async function fetchTodoById(id) { + const url = buildUrl(`/todos/${id}`) + const response = await fetch(url) + + if (!response.ok) { + throw new Error(`ToDo #${id} nicht gefunden (HTTP ${response.status})`) + } + + return response.json() +} + +// ============================================================= +// POST /todos – Neues ToDo erstellen +// ============================================================= + +/** + * createTodo – Erstellt ein neues ToDo. + * + * @param {{ userId: number, title: string, completed?: boolean }} todo + * @returns {Promise} - Erstelltes ToDo-Objekt (inkl. vergebener id) + * + * Beispiel-Aufruf: + * createTodo({ userId: 1, title: "Einkaufen gehen" }) + */ +export async function createTodo(todo) { + const url = buildUrl('/todos') + const response = await fetch(url, { + method: 'POST', + headers: { + // Teilt dem Server mit, dass wir JSON senden + 'Content-Type': 'application/json', + }, + // JSON.stringify() wandelt das JavaScript-Objekt in einen JSON-String um + body: JSON.stringify(todo), + }) + + if (!response.ok) { + throw new Error(`Fehler beim Erstellen des ToDos (HTTP ${response.status})`) + } + + // Der Server antwortet mit 201 Created + dem neuen Objekt + return response.json() +} + +// ============================================================= +// PATCH /todos/{id} – ToDo teilweise aktualisieren +// ============================================================= + +/** + * patchTodo – Aktualisiert einzelne Felder eines ToDos. + * + * Im Unterschied zu PUT werden bei PATCH nur die angegebenen Felder + * geändert – alle anderen bleiben unverändert. + * + * @param {number} id - Todo-ID + * @param {{ userId?: number, title?: string, completed?: boolean }} changes + * @returns {Promise} - Aktualisiertes ToDo + * + * Beispiel-Aufruf (nur completed ändern): + * patchTodo(5, { completed: true }) + */ +export async function patchTodo(id, changes) { + const url = buildUrl(`/todos/${id}`) + const response = await fetch(url, { + method: 'PATCH', + headers: { 'Content-Type': 'application/json' }, + body: JSON.stringify(changes), + }) + + if (!response.ok) { + throw new Error(`Fehler beim Aktualisieren von ToDo #${id} (HTTP ${response.status})`) + } + + return response.json() +} + +// ============================================================= +// PUT /todos/{id} – ToDo vollständig ersetzen +// ============================================================= + +/** + * putTodo – Ersetzt ein ToDo vollständig (alle Felder müssen angegeben werden). + * + * @param {number} id - Todo-ID + * @param {{ userId: number, title: string, completed: boolean }} todo + * @returns {Promise} - Ersetztes ToDo + */ +export async function putTodo(id, todo) { + const url = buildUrl(`/todos/${id}`) + const response = await fetch(url, { + method: 'PUT', + headers: { 'Content-Type': 'application/json' }, + body: JSON.stringify(todo), + }) + + if (!response.ok) { + throw new Error(`Fehler beim Ersetzen von ToDo #${id} (HTTP ${response.status})`) + } + + return response.json() +} + +// ============================================================= +// DELETE /todos/{id} – ToDo löschen +// ============================================================= + +/** + * deleteTodo – Löscht ein ToDo anhand seiner ID. + * + * @param {number} id - Todo-ID + * @returns {Promise} - Kein Rückgabewert (204 No Content) + */ +export async function deleteTodo(id) { + const url = buildUrl(`/todos/${id}`) + const response = await fetch(url, { + method: 'DELETE', + }) + + if (!response.ok) { + throw new Error(`Fehler beim Löschen von ToDo #${id} (HTTP ${response.status})`) + } + // DELETE gibt HTTP 204 No Content zurück → kein response.json() nötig +} diff --git a/src/components/TodoForm.jsx b/src/components/TodoForm.jsx new file mode 100644 index 0000000..325fb4e --- /dev/null +++ b/src/components/TodoForm.jsx @@ -0,0 +1,66 @@ +/** + * TodoForm.jsx – Formular zum Erstellen eines neuen ToDos + * ========================================================= + * + * Props: + * onAdd(todo) – Callback-Funktion, die mit dem neuen Todo-Objekt + * aufgerufen wird, sobald das Formular abgeschickt wird. + * Das Todo-Objekt hat die Form: { userId, title } + */ +import { useState } from 'react' + +function TodoForm({ onAdd }) { + // --- Lokaler State der Formularfelder --- + // useState gibt [aktueller Wert, Setter-Funktion] zurück. + // Jedes Mal wenn der Setter aufgerufen wird, rendert React die Komponente neu. + const [title, setTitle] = useState('') + const [userId, setUserId] = useState(1) + + /** + * handleSubmit – wird beim Klick auf "Hinzufügen" / Enter ausgeführt. + * + * @param {Event} e - Das Browser-Formular-Event + */ + function handleSubmit(e) { + // Verhindert das Standard-Verhalten des Browsers (Seite neu laden) + e.preventDefault() + + // Leere Titel ignorieren (trim() entfernt Leerzeichen am Rand) + if (!title.trim()) return + + // Callback an die Elternkomponente (App.jsx) aufrufen + onAdd({ userId: Number(userId), title: title.trim() }) + + // Eingabefeld zurücksetzen + setTitle('') + } + + return ( +
+ {/* Zahlenfeld für die User-ID */} + setUserId(e.target.value)} + className="input-userid" + aria-label="User-ID" + title="User-ID" + /> + + {/* Textfeld für den Titel – "controlled input": Wert kommt aus State */} + setTitle(e.target.value)} + placeholder="Neues ToDo eingeben ..." + className="input-title" + aria-label="Titel des ToDos" + /> + + +
+ ) +} + +export default TodoForm diff --git a/src/components/TodoItem.jsx b/src/components/TodoItem.jsx new file mode 100644 index 0000000..e35e500 --- /dev/null +++ b/src/components/TodoItem.jsx @@ -0,0 +1,44 @@ +/** + * TodoItem.jsx – Einzelnes ToDo in der Liste + * =========================================== + * + * Props: + * todo – Todo-Objekt: { id, userId, title, completed } + * onToggle(id, completed) – Callback: completed-Status umschalten + * onDelete(id) – Callback: ToDo löschen + */ + +function TodoItem({ todo, onToggle, onDelete }) { + return ( + // Klasse "completed" wird gesetzt, wenn todo.completed === true + // → CSS kann erledigte Todos anders darstellen (durchgestrichen) +
  • + + {/* Checkbox: Haken = erledigt, kein Haken = offen */} + onToggle(todo.id, !todo.completed)} + aria-label="Status umschalten" + /> + + {/* Titel des ToDos */} + {todo.title} + + {/* Kleine Anzeige: welchem User das ToDo gehört */} + User {todo.userId} + + {/* Löschen-Button */} + +
    • + ) +} + +export default TodoItem diff --git a/src/components/TodoList.jsx b/src/components/TodoList.jsx new file mode 100644 index 0000000..5b767c2 --- /dev/null +++ b/src/components/TodoList.jsx @@ -0,0 +1,59 @@ +/** + * TodoList.jsx – Liste aller ToDos + Pagination + * =============================================== + * + * Props: + * todos – Array von Todo-Objekten + * page – Aktuelle Seitennummer (Zahl) + * hasMore – true, wenn es eine nächste Seite geben könnte + * onPrev() – Callback: eine Seite zurück + * onNext() – Callback: eine Seite vor + * onToggle – Wird an TodoItem weitergeleitet + * onDelete – Wird an TodoItem weitergeleitet + */ +import TodoItem from './TodoItem' + +function TodoList({ todos, page, hasMore, onPrev, onNext, onToggle, onDelete }) { + // Sonderfall: Keine Ergebnisse + if (todos.length === 0) { + return

    Keine ToDos gefunden.

    + } + + return ( +
    + {/* Die eigentliche Liste – todos.map() erzeugt für jedes Element ein */} + {/* + key={todo.id} ist PFLICHT bei Listen in React: + React nutzt den Key, um bei Updates effizient die richtigen + DOM-Elemente zu finden und zu aktualisieren. + */} +
      + {todos.map((todo) => ( + + ))} +
    + + {/* Pagination: Zurück / Seite X / Weiter */} +
    + {/* disabled wenn wir auf Seite 1 sind */} + + + Seite {page} + + {/* disabled wenn die letzte Seite weniger Einträge hatte als das Limit */} + +
    +
    + ) +} + +export default TodoList diff --git a/src/index.css b/src/index.css new file mode 100644 index 0000000..5866134 --- /dev/null +++ b/src/index.css @@ -0,0 +1,181 @@ +/* ============================================================= + index.css – Globales Stylesheet der ToDo-App + Kein externes CSS-Framework – alles von Hand geschrieben. + ============================================================= */ + +/* --- Reset & Basis ----------------------------------------- */ +/* Box-Sizing: border-box → Padding/Border werden NICHT zur Breite addiert */ +*, +*::before, +*::after { + box-sizing: border-box; + margin: 0; + padding: 0; +} + +body { + font-family: system-ui, -apple-system, sans-serif; + background: #f0f2f5; + color: #222; + padding: 2rem 1rem; + min-height: 100vh; +} + +/* --- Container --------------------------------------------- */ +.container { + max-width: 640px; + margin: 0 auto; + background: #fff; + border-radius: 10px; + padding: 2rem; + box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08); +} + +h1 { + font-size: 1.9rem; + margin-bottom: 0.25rem; +} + +.subtitle { + color: #888; + margin-bottom: 1.75rem; + font-size: 0.875rem; +} + +/* --- Formular ---------------------------------------------- */ +.todo-form { + display: flex; + gap: 0.5rem; + margin-bottom: 1.5rem; +} + +/* Schmales Zahlenfeld für die User-ID */ +.input-userid { + width: 72px; + padding: 0.5rem 0.6rem; + border: 1px solid #ccc; + border-radius: 6px; + font-size: 1rem; +} + +/* Breites Textfeld für den Titel – wächst im Flexbox-Container */ +.input-title { + flex: 1; + padding: 0.5rem 0.75rem; + border: 1px solid #ccc; + border-radius: 6px; + font-size: 1rem; +} + +.input-userid:focus, +.input-title:focus { + outline: none; + border-color: #4a90e2; + box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.15); +} + +/* --- Buttons ----------------------------------------------- */ +button { + padding: 0.5rem 1.1rem; + border: none; + border-radius: 6px; + background: #4a90e2; + color: #fff; + cursor: pointer; + font-size: 1rem; + transition: background 0.15s; +} + +button:hover:not(:disabled) { + background: #357abd; +} + +button:disabled { + background: #ccc; + cursor: not-allowed; +} + +/* --- ToDo-Liste -------------------------------------------- */ +.todo-list { + list-style: none; +} + +/* Jede Zeile */ +.todo-item { + display: flex; + align-items: center; + gap: 0.75rem; + padding: 0.75rem 0; + border-bottom: 1px solid #f0f0f0; +} + +.todo-item:last-child { + border-bottom: none; +} + +/* Erledigte Todos werden durchgestrichen und abgeschwächt */ +.todo-item.completed .todo-title { + text-decoration: line-through; + color: #aaa; +} + +.todo-title { + flex: 1; + font-size: 0.95rem; +} + +/* Kleine Anzeige der User-ID */ +.todo-meta { + font-size: 0.78rem; + color: #bbb; + white-space: nowrap; +} + +/* Löschen-Button (rot) */ +.btn-delete { + background: #e74c3c; + padding: 0.3rem 0.65rem; + font-size: 0.8rem; + border-radius: 4px; + flex-shrink: 0; +} + +.btn-delete:hover:not(:disabled) { + background: #c0392b; +} + +/* --- Pagination -------------------------------------------- */ +.pagination { + display: flex; + align-items: center; + justify-content: center; + gap: 1.25rem; + margin-top: 1.5rem; + padding-top: 1rem; + border-top: 1px solid #f0f0f0; +} + +.pagination span { + font-size: 0.9rem; + color: #666; +} + +/* --- Zustands-Meldungen ------------------------------------ */ +.loading, +.empty { + text-align: center; + color: #999; + padding: 2.5rem 0; + font-size: 0.95rem; +} + +/* Fehlermeldung (rotes Banner) */ +.error { + color: #c0392b; + background: #fdf0ef; + border: 1px solid #f5c6c2; + border-radius: 6px; + padding: 0.75rem 1rem; + margin-bottom: 1rem; + font-size: 0.9rem; +} diff --git a/src/main.jsx b/src/main.jsx new file mode 100644 index 0000000..523ee6f --- /dev/null +++ b/src/main.jsx @@ -0,0 +1,17 @@ +/** + * main.jsx – Einstiegspunkt der React-Anwendung + * + * createRoot() bindet React an das
    in der index.html. + * StrictMode aktiviert zusätzliche Warnungen in der Entwicklung – + * er führt bestimmte Funktionen doppelt aus, um Fehler früh zu erkennen. + */ +import { StrictMode } from 'react' +import { createRoot } from 'react-dom/client' +import './index.css' +import App from './App' + +createRoot(document.getElementById('root')).render( + + + +) diff --git a/vite.config.js b/vite.config.js new file mode 100644 index 0000000..f1b1d9d --- /dev/null +++ b/vite.config.js @@ -0,0 +1,11 @@ +// vite.config.js – Konfiguration des Vite Build-Tools +// +// @vitejs/plugin-react aktiviert die React-spezifischen Transformationen: +// - JSX wird zu JavaScript kompiliert +// - Hot Module Replacement (HMR) für schnelles Entwickeln +import { defineConfig } from 'vite' +import react from '@vitejs/plugin-react' + +export default defineConfig({ + plugins: [react()], +})