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true gaia true Web Engineering – DHBW Stuttgart Michael Czechowski – SoSe 2026 Web Engineering
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Web Engineering

DHBW Stuttgart · Informatik / Wirtschaftsinformatik

Sommersemester 2026

Willkommen!

1. Sitzung: 08.05.2026

Wer bist du, was machst du?

  • B.Sc. Wirtschaftsinformatik (Leibniz-FH Hannover)
  • Angestellt bei PONS Langenscheidt GmbH in Stuttgart
  • Honorardozent und Berater

Bisherige Vorlesungen (DHBW/Leibniz-FH):

  • Social Engineering, Mobile Medien, Web Eng

Vorlesungsplan

Sitzung Datum Thema
1 08.05. Intro, Projektgruppen, Internet 101
2 15.05. HTML und CSS (Frameworks)
3 22.05. JS (Frameworks) und npm
4 29.05. nodeJS: Scripting, Running and Building
5 05.06. Express API, CRUD und "Middlewares"
6 12.06. Projektwerkstattbericht
7 19.06. Testing (unit, integration, end-to-end)
8 26.06. TypeScript
9 03.07. Docker, Proxies and DBs
10 10.07. Wrap-up & Projektsupport
11 17.07. Präsentation

Prüfungsleistung – Übersicht

Eigenes Projekt: Web-App ODER Backend (API/CLI).

Grundanforderungen (75 Punkte)

Punkte Bereich
20 Idee, Konzeption, Planung
5 Plattformunabhängigkeit
25 Clean Code (KISS, SOLID, DI, Testing, Error Handling)
15 Präsentation
10 Dokumentation

Zusatzpunkte (max. 10): TypeScript, Docker, Dev/Prod-Parity, .env, npm-Publish, Domain, HTTPS, Responsive Design.

Prüfungsleistung – Idee & Konzeption (20 P.)

  • "Powerpoint"-Präsentation + Folien
  • Aussagekräftiger Arbeitstitel + Beschreibung
  • Elevator Pitch (max. 1 Min.)
  • Repo-Link (GitHub / GitLab / Codeberg / BitBucket)
  • Logs: wie hat sich Projekt verändert vs. Ursprungsidee?
  • Schematischer Projektaufbau (UML o. Ä.)

Prüfungsleistung – Clean Code (25 P.)

  • README.md (clone, start, contribute)
  • KISS – Keep It Simple, Stupid
  • SOLID – SRP, OCP, LSP, ISP, DIP
  • DI – Dependency Injection
  • Testing-Pyramide (Unit, Integration, E2E)
  • Exception/Error Handling

Prüfungsleistung – Abgabe & Termine

  • Code-Upload: bis 27.07.
  • Präsentation: 17.07. (Gruppen, ~10 Min.)

Details: https://git.dailysh.it/DHBW/pruefungsleistung

Internet 101 – Zeitleiste

Jahr Ereignis
1966 ARPANET
1969 RFCs
1986 IETF
1992 Internet Society
1974 TCP/IP und HTTP(S)
1987 Domain Names und DNS
1993 "Erster" Browser: Mosaic
1994 W3C (HTML, XML, CSS, SVG, WCAG etc.)
1995 ECMAScript (JS)
2006/08 V8 JS Runtime Engine
Heute 1,3 Mio. km Unterseekabel

Internet 101 – Browser Request

Browser                          Server
  |                                |
  |-- GET /products -------------->|
  |<-- HTTP 200 + index.html -----|
  |                                |
  |-- GET /script.js ------------->|
  |<-- HTTP 200 + script.js ------|
  |                                |
  |-- GET /api/products ---------->|
  |<-- HTTP 200 + JSON ------------|

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HTTP – Hypertext Transfer Protocol

Request:

GET /products HTTP/1.1
Host: localhost:8080

Response:

HTTP/1.1 200 OK
Content-Type: application/json

[{"id": 1, "name": "Produkt A"}, ...]

Entwicklungsumgebung

Tools:

  • Node.js + npm
  • VS Code
  • Git
  • Chrome DevTools

Versionierung mit Git

git init
git add .
git commit -m "initial commit"
git remote add origin https://github.com/user/repo.git
git push -u origin main

HTML – Hypertext Markup Language

HTML Grundlagen

<!DOCTYPE html>
<html lang="de">
<head>
  <meta charset="UTF-8">
  <title>Meine Seite</title>
</head>
<body>
  <h1>Überschrift</h1>
  <p>Textabsatz</p>
</body>
</html>

Semantisches HTML

<header>Navigationsbereich</header>
<nav>Navigation</nav>
<main>
  <article>
    <section>
      <h2>Überschrift</h2>
      <p>Inhalt</p>
    </section>
  </article>
</main>
<footer>Fußzeile</footer>

HTML – Tabellen und Listen

<table>
  <thead>
    <tr><th>Name</th><th>Preis</th></tr>
  </thead>
  <tbody>
    <tr><td>Produkt A</td><td>29,99 €</td></tr>
  </tbody>
</table>

<ul>
  <li>Punkt 1</li>
  <li>Punkt 2</li>
</ul>

CSS – Cascading Style Sheets

CSS Grundlagen

/* Element */
body { font-family: Arial, sans-serif; }

/* Klasse */
.button { background: #005f8a; color: white; }

/* ID */
#header { height: 60px; }

/* Attribut */
input[type="text"] { border: 1px solid #ccc; }

CSS Layout – Flexbox

.container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

CSS Layout – Grid

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

CSS – Box Model

.box {
  margin: 10px;
  border: 2px solid #005f8a;
  padding: 20px;
  width: 200px;
  box-sizing: border-box;
}

CSS Responsive

@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

JavaScript

JavaScript Grundlagen

// Variablen
let name = "Welt";
const alter = 25;

// Funktionen
function gruss(name) {
  return `Hallo, ${name}!`;
}

// Arrow Functions
const add = (a, b) => a + b;

// Arrays
const arr = [1, 2, 3];
arr.map(x => x * 2); // [2, 4, 6]

DOM Manipulation

// Element auswählen
const title = document.querySelector('h1');

// Inhalt ändern
title.textContent = 'Neue Überschrift';

// Event Listener
button.addEventListener('click', () => {
  alert('Geklickt!');
});

Fetch API

fetch('/api/products')
  .then(res => res.json())
  .then(data => {
    console.log(data);
  })
  .catch(err => console.error(err));

Async/Await

async function loadProducts() {
  try {
    const res = await fetch('/api/products');
    const data = await res.json();
    return data;
  } catch (err) {
    console.error('Fehler:', err);
  }
}

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JavaScript Frameworks – Kategorien

Kategorie Beispiele
CSS Frameworks Tailwind, Bootstrap, shadcn/ui
Frontend Frameworks React, Vue, Svelte, Astro
Rendering / Meta Next.js, Nuxt, Gatsby
Build Tools / Bundler Webpack, Vite, Parcel, esbuild
Backend Frameworks Express, Fastify, NestJS

Vanilla JS – Counter

<button id="myButton">Clicked 0 times</button>
<script>
  let count = 0;
  const btn = document.getElementById('myButton');
  btn.addEventListener('click', () => {
    count++;
    btn.textContent = `Clicked ${count} times`;
  });
</script>

✓ hohe Kompatibilität, simpel ✗ State-Management, Re-Rendering wird schnell komplex

React – Counter (JSX)

import { useState } from "react";

function MyButton() {
  const [count, setCount] = useState(0);

  return (
    <button onClick={() => setCount(count + 1)}>
      Clicked {count} times
    </button>
  );
}
  • Component-Based Architecture
  • Virtual DOM, JSX, Hooks
  • großes Ökosystem (React Router, Redux, …)

Vue 3 – Composition API

<script setup>
import { ref } from "vue";
const count = ref(0);
</script>

<template>
  <button @click="count++">
    Clicked {{ count }} times
  </button>
</template>
  • Reactive Data Binding
  • Single-File Components (.vue)
  • Vue Router, Pinia (State)

Svelte – Counter

<script>
  let count = 0;
</script>

<button on:click={() => count += 1}>
  Clicked {count} {count === 1 ? 'time' : 'times'}
</button>
  • Compiler-Based – kein Runtime-Framework
  • Reactive Assignments (let)
  • Built-in Animationen

Astro – Content-First

---
const greeting = "Hallo DHBW";
---
<html>
  <body>
    <h1>{greeting}</h1>
    <MyReactButton client:load />
  </body>
</html>
  • Islands Architecture – Komponenten mehrerer Frameworks mischen
  • Default: kein JS im Output (nur statisches HTML)
  • Hydration on demand (client:load, client:visible)

Rendering Frameworks

Frontend SSR SSG File Routing
Next.js React ✓ ✓ /app/page.js
Nuxt Vue ✓ ✓ /pages/*.vue
Gatsby React – ✓ GraphQL Data

Build Tools – Webpack

  • Module Bundling (JS, CSS, Images)
  • Module Loaders + großes Plugin-Ökosystem
  • Code Splitting, HMR
  • Konfigurations-lastig (webpack.config.js)

→ Standard für viele Legacy-Setups.

Build Tools – Vite

// vite.config.js
import { defineConfig } from "vite";

export default defineConfig({
  server: {
    proxy: {
      "/api": {
        target: "http://localhost:4567",
        changeOrigin: true,
        rewrite: (path) => path.replace(/^\/api/, "")
      }
    }
  }
});
  • Rollup unter der Haube, HMR mit ES Modules
  • Tree-Shaking, Code Splitting, React + Vue out-of-the-box

Build Tools – Parcel

{
  "name": "my-project",
  "source": "src/index.html",
  "browserslist": "> 0.5%, last 2 versions, not dead",
  "scripts": {
    "start": "parcel",
    "build": "parcel build"
  },
  "devDependencies": {
    "parcel": "latest"
  }
}
  • Zero-Config
  • Auto-Resolution, HMR
  • TS / CSS-Preprocessors out-of-the-box

Microfrontends

  • Mehrere unabhängige Frontend-Apps in einer Page
  • Module Federation (Webpack 5)
  • single-spa: https://single-spa.js.org/
  • Anwendungsfall: große Teams, unterschiedliche Tech-Stacks pro Domain

→ Komplexitätskosten: nur bei echtem Skalierungsbedarf.

Demo-Repos

Fragen?

  1. Was ist der Unterschied zwischen let und const?
  2. Wie funktioniert fetch()?
  3. Was macht box-sizing: border-box?
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