docs: Add SSR setup guide and update SSR polyfills
- Add SSR_ANLEITUNG.md with step-by-step setup instructions - Add SSR_DOKUMENTATION.md with technical SSR documentation - Update ssr-dom-polyfill.ts for better SSR compatibility - Update ssr-dom-preload.mjs for dev:ssr mode - Update DEPLOYMENT.md with SSR deployment instructions
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# BizMatch SSR - Schritt-für-Schritt-Anleitung
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## Problem: SSR startet nicht auf neuem Laptop?
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Diese Anleitung hilft Ihnen, BizMatch mit Server-Side Rendering (SSR) auf einem neuen Rechner zum Laufen zu bringen.
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---
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## Voraussetzungen prüfen
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```bash
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# Node.js Version prüfen (mind. v18 erforderlich)
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node --version
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# npm Version prüfen
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npm --version
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# Falls Node.js fehlt oder veraltet ist:
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# https://nodejs.org/ → LTS Version herunterladen
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```
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---
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## Schritt 1: Repository klonen (falls noch nicht geschehen)
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```bash
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git clone https://gitea.bizmatch.net/aknuth/bizmatch-project.git
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cd bizmatch-project/bizmatch
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```
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---
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## Schritt 2: Dependencies installieren
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**WICHTIG:** Dieser Schritt ist essentiell und wird oft vergessen!
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```bash
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cd ~/bizmatch-project/bizmatch
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npm install
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```
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> **Tipp:** Bei Problemen versuchen Sie: `rm -rf node_modules package-lock.json && npm install`
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---
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## ⚠️ WICHTIG: Erstes Setup auf neuem Laptop
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**Wenn Sie das Projekt zum ersten Mal auf einem neuen Rechner klonen, müssen Sie ZUERST einen Build erstellen!**
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```bash
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cd ~/bizmatch-project/bizmatch
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# 1. Dependencies installieren
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npm install
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# 2. Build erstellen (erstellt dist/bizmatch/server/index.server.html)
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npm run build:ssr
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```
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**Warum?**
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- Die `dist/` Folder werden NICHT ins Git eingecheckt (`.gitignore`)
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- Die Datei `dist/bizmatch/server/index.server.html` fehlt nach `git clone`
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- Ohne Build → `npm run serve:ssr` crasht mit "Cannot find index.server.html"
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**Nach dem ersten Build** können Sie dann Development-Befehle nutzen.
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---
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## Schritt 3: Umgebung wählen
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### Option A: Entwicklung (OHNE SSR)
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Schnellster Weg für lokale Entwicklung:
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```bash
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npm start
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```
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- Öffnet automatisch: http://localhost:4200
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- Hot-Reload aktiv (Code-Änderungen werden sofort sichtbar)
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- **Kein SSR** (schneller für Entwicklung)
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### Option B: Development mit SSR
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Für SSR-Testing während der Entwicklung:
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```bash
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npm run dev:ssr
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```
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- Öffnet: http://localhost:4200
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- Hot-Reload aktiv
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- **SSR aktiv** (simuliert Production)
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- Nutzt DOM-Polyfills via `ssr-dom-preload.mjs`
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### Option C: Production Build mit SSR
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Für finalen Production-Test:
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```bash
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# 1. Build erstellen
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npm run build:ssr
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# 2. Server starten
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npm run serve:ssr
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```
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- Server läuft auf: http://localhost:4200
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- **Vollständiges SSR** (wie in Production)
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- Kein Hot-Reload (für Änderungen erneut builden)
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---
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## Schritt 4: Testen
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Öffnen Sie http://localhost:4200 im Browser.
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### SSR funktioniert, wenn:
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1. **Seitenquelltext ansehen** (Rechtsklick → "Seitenquelltext anzeigen"):
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- HTML-Inhalt ist bereits vorhanden (nicht nur `<app-root></app-root>`)
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- Meta-Tags sind sichtbar
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2. **JavaScript deaktivieren** (Chrome DevTools → Settings → Disable JavaScript):
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- Seite zeigt Inhalt an (wenn auch nicht interaktiv)
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3. **Network-Tab** (Chrome DevTools → Network → Doc):
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- HTML-Response enthält bereits gerenderten Content
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---
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## Häufige Probleme und Lösungen
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### Problem 1: `npm: command not found`
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**Lösung:** Node.js installieren
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```bash
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# Ubuntu/Debian
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curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
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sudo apt-get install -y nodejs
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# macOS
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brew install node
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# Windows
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# https://nodejs.org/ → Installer herunterladen
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```
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### Problem 2: `Cannot find module '@angular/ssr'`
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**Lösung:** Dependencies neu installieren
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```bash
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rm -rf node_modules package-lock.json
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npm install
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```
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### Problem 3: `Error: EADDRINUSE: address already in use :::4200`
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**Lösung:** Port ist bereits belegt
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```bash
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# Prozess finden und beenden
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lsof -i :4200
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kill -9 <PID>
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# Oder anderen Port nutzen
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PORT=4300 npm run serve:ssr
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```
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### Problem 4: `Error loading @angular/platform-server` oder "Cannot find index.server.html"
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**Lösung:** Build fehlt oder ist veraltet
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```bash
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# dist-Ordner löschen und neu builden
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rm -rf dist
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npm run build:ssr
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# Dann starten
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npm run serve:ssr
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```
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**Häufiger Fehler auf neuem Laptop:**
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- Nach `git pull` fehlt der `dist/` Ordner komplett
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- `index.server.html` wird beim Build erstellt, nicht ins Git eingecheckt
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- **Lösung:** Immer erst `npm run build:ssr` ausführen!
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### Problem 5: "Seite lädt nicht" oder "White Screen"
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**Lösung:**
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1. Browser-Cache leeren (Strg+Shift+R / Cmd+Shift+R)
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2. DevTools öffnen → Console-Tab → Fehler prüfen
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3. Sicherstellen, dass Backend läuft (falls API-Calls)
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### Problem 6: "Module not found: Error: Can't resolve 'window'"
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**Lösung:** Browser-spezifischer Code wird im SSR-Build verwendet
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- Prüfen Sie `ssr-dom-polyfill.ts` - DOM-Mocks sollten vorhanden sein
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- Code mit `isPlatformBrowser()` schützen:
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```typescript
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import { isPlatformBrowser } from '@angular/common';
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import { PLATFORM_ID } from '@angular/core';
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constructor(@Inject(PLATFORM_ID) private platformId: Object) {}
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ngOnInit() {
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if (isPlatformBrowser(this.platformId)) {
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// Nur im Browser ausführen
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window.scrollTo(0, 0);
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}
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}
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```
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---
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## Production Deployment mit PM2
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Für dauerhaften Betrieb (Server-Umgebung):
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```bash
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# PM2 global installieren
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npm install -g pm2
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# Production Build
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npm run build:ssr
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# Server mit PM2 starten
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pm2 start dist/bizmatch/server/server.mjs --name "bizmatch"
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# Auto-Start bei Server-Neustart
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pm2 startup
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pm2 save
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# Logs anzeigen
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pm2 logs bizmatch
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# Server neustarten nach Updates
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npm run build:ssr && pm2 restart bizmatch
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```
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---
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## Unterschiede der Befehle
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| Befehl | SSR | Hot-Reload | Verwendung |
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|--------|-----|-----------|------------|
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| `npm start` | ❌ | ✅ | Entwicklung (schnell) |
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| `npm run dev:ssr` | ✅ | ✅ | Entwicklung mit SSR |
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| `npm run build:ssr` | ✅ Build | ❌ | Production Build erstellen |
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| `npm run serve:ssr` | ✅ | ❌ | Production Server starten |
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---
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## Nächste Schritte
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1. Für normale Entwicklung: **`npm start`** verwenden
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2. Vor Production-Deployment: **`npm run build:ssr`** testen
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3. SSR-Funktionalität prüfen (siehe "Schritt 4: Testen")
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4. Bei Problemen: Logs prüfen und obige Lösungen durchgehen
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---
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## Support
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Bei weiteren Problemen:
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1. **Logs prüfen:** `npm run serve:ssr` zeigt Fehler in der Konsole
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2. **Browser DevTools:** Console + Network Tab
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3. **Build-Output:** `npm run build:ssr` zeigt Build-Fehler
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4. **Node-Version:** `node --version` (sollte ≥ v18 sein)
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@ -0,0 +1,784 @@
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# BizMatch SSR - Technische Dokumentation
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## Was ist Server-Side Rendering (SSR)?
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Server-Side Rendering bedeutet, dass die Angular-Anwendung nicht nur im Browser, sondern auch auf dem Server läuft und HTML vorab generiert.
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---
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## Unterschied: SPA vs. SSR vs. Prerendering
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### 1. Single Page Application (SPA) - OHNE SSR
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**Ablauf:**
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```
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Browser → lädt index.html
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→ index.html enthält nur <app-root></app-root>
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→ lädt JavaScript-Bundles
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→ JavaScript rendert die Seite
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```
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**HTML-Response:**
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```html
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<!doctype html>
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<html>
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<head><title>BizMatch</title></head>
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<body>
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<app-root></app-root> <!-- LEER! -->
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<script src="main.js"></script>
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</body>
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</html>
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```
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**Nachteile:**
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- ❌ Suchmaschinen sehen leeren Content
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- ❌ Langsamer "First Contentful Paint"
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- ❌ Schlechtes SEO
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- ❌ Kein Social-Media-Preview (Open Graph)
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---
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### 2. Server-Side Rendering (SSR)
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**Ablauf:**
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```
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Browser → fragt Server nach /business/123
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→ Server rendert Angular-App mit Daten
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→ Server sendet vollständiges HTML
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→ Browser zeigt sofort Inhalt
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→ JavaScript lädt im Hintergrund
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→ Anwendung wird "hydrated" (interaktiv)
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```
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**HTML-Response:**
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```html
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<!doctype html>
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<html>
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<head>
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<title>Restaurant "Zum Löwen" | BizMatch</title>
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<meta name="description" content="Restaurant in München...">
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</head>
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<body>
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<app-root>
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<div class="listing-page">
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<h1>Restaurant "Zum Löwen"</h1>
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<p>Traditionelles deutsches Restaurant...</p>
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<!-- Kompletter gerendeter Content! -->
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</div>
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</app-root>
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<script src="main.js"></script>
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</body>
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</html>
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```
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**Vorteile:**
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- ✅ Suchmaschinen sehen vollständigen Inhalt
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- ✅ Schneller First Contentful Paint
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- ✅ Besseres SEO
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- ✅ Social-Media-Previews funktionieren
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**Nachteile:**
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- ⚠️ Komplexere Konfiguration
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- ⚠️ Server-Ressourcen erforderlich
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- ⚠️ Code muss browser- und server-kompatibel sein
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---
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### 3. Prerendering (Static Site Generation)
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**Ablauf:**
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```
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Build-Zeit → Rendert ALLE Seiten zu statischen HTML-Dateien
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→ /business/123.html, /business/456.html, etc.
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→ HTML-Dateien werden auf CDN deployed
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```
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**Unterschied zu SSR:**
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- Prerendering: HTML wird **zur Build-Zeit** generiert
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- SSR: HTML wird **zur Request-Zeit** generiert
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**BizMatch nutzt SSR, NICHT Prerendering**, weil:
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- Listings dynamisch sind (neue Einträge täglich)
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- Benutzerdaten personalisiert sind
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- Suche und Filter zur Laufzeit erfolgen
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---
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## Wie funktioniert SSR in BizMatch?
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### Architektur-Überblick
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```
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┌─────────────────────────────────────────────────────────────┐
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│ Browser Request │
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│ GET /business/restaurant-123 │
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└────────────────────────────┬────────────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────────────────────┐
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│ Express Server │
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│ (server.ts:30-41) │
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||||||
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├─────────────────────────────────────────────────────────────┤
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||||||
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│ 1. Empfängt Request │
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│ 2. Ruft AngularNodeAppEngine auf │
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│ 3. Rendert Angular-Komponente serverseitig │
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||||||
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│ 4. Sendet HTML zurück │
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└────────────────────────────┬────────────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────────────────────┐
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│ AngularNodeAppEngine │
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│ (@angular/ssr/node) │
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├─────────────────────────────────────────────────────────────┤
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||||||
|
│ 1. Lädt main.server.ts │
|
||||||
|
│ 2. Bootstrapped Angular in Node.js │
|
||||||
|
│ 3. Führt Routing aus (/business/restaurant-123) │
|
||||||
|
│ 4. Rendert Component-Tree zu HTML-String │
|
||||||
|
│ 5. Injiziert Meta-Tags, Titel │
|
||||||
|
└────────────────────────────┬────────────────────────────────┘
|
||||||
|
│
|
||||||
|
▼
|
||||||
|
┌─────────────────────────────────────────────────────────────┐
|
||||||
|
│ Angular Application │
|
||||||
|
│ (Browser-Code im Server) │
|
||||||
|
├─────────────────────────────────────────────────────────────┤
|
||||||
|
│ • Komponenten werden ausgeführt │
|
||||||
|
│ • API-Calls werden gemacht (TransferState) │
|
||||||
|
│ • DOM wird SIMULIERT (ssr-dom-polyfill.ts) │
|
||||||
|
│ • HTML-Output wird generiert │
|
||||||
|
└─────────────────────────────────────────────────────────────┘
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Wichtige Dateien und ihre Rolle
|
||||||
|
|
||||||
|
### 1. `server.ts` - Express Server
|
||||||
|
|
||||||
|
```typescript
|
||||||
|
const angularApp = new AngularNodeAppEngine();
|
||||||
|
|
||||||
|
server.get('*', (req, res, next) => {
|
||||||
|
angularApp.handle(req) // ← Rendert Angular serverseitig
|
||||||
|
.then((response) => {
|
||||||
|
if (response) {
|
||||||
|
writeResponseToNodeResponse(response, res);
|
||||||
|
}
|
||||||
|
});
|
||||||
|
});
|
||||||
|
```
|
||||||
|
|
||||||
|
**Rolle:**
|
||||||
|
- HTTP-Server (Express)
|
||||||
|
- Nimmt Requests entgegen
|
||||||
|
- Delegiert an Angular SSR Engine
|
||||||
|
- Sendet gerenderte HTML-Responses zurück
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### 2. `src/main.server.ts` - Server Entry Point
|
||||||
|
|
||||||
|
```typescript
|
||||||
|
import './ssr-dom-polyfill'; // ← WICHTIG: DOM-Mocks laden
|
||||||
|
|
||||||
|
import { bootstrapApplication } from '@angular/platform-browser';
|
||||||
|
import { AppComponent } from './app/app.component';
|
||||||
|
import { config } from './app/app.config.server';
|
||||||
|
|
||||||
|
const bootstrap = () => bootstrapApplication(AppComponent, config);
|
||||||
|
|
||||||
|
export default bootstrap;
|
||||||
|
```
|
||||||
|
|
||||||
|
**Rolle:**
|
||||||
|
- Entry Point für SSR
|
||||||
|
- Lädt DOM-Polyfills **VOR** allen anderen Imports
|
||||||
|
- Bootstrapped Angular im Server-Kontext
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### 3. `dist/bizmatch/server/index.server.html` - Server Template
|
||||||
|
|
||||||
|
**WICHTIG:** Diese Datei wird **beim Build erstellt**, nicht manuell geschrieben!
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Build-Prozess erstellt automatisch:
|
||||||
|
npm run build:ssr
|
||||||
|
→ dist/bizmatch/server/index.server.html ✅
|
||||||
|
→ dist/bizmatch/server/server.mjs ✅
|
||||||
|
→ dist/bizmatch/browser/index.csr.html ✅
|
||||||
|
```
|
||||||
|
|
||||||
|
**Quelle:**
|
||||||
|
- Angular nimmt `src/index.html` als Vorlage
|
||||||
|
- Fügt SSR-spezifische Meta-Tags hinzu
|
||||||
|
- Generiert `index.server.html` für serverseitiges Rendering
|
||||||
|
- Generiert `index.csr.html` für clientseitiges Rendering (Fallback)
|
||||||
|
|
||||||
|
**Warum nicht im Git?**
|
||||||
|
- Build-Artefakte werden nicht eingecheckt (`.gitignore`)
|
||||||
|
- Jeder Build erstellt sie neu
|
||||||
|
- Verhindert Merge-Konflikte bei generierten Dateien
|
||||||
|
|
||||||
|
**Fehlerquelle bei neuem Laptop:**
|
||||||
|
```
|
||||||
|
git clone → dist/ Ordner fehlt
|
||||||
|
→ index.server.html fehlt
|
||||||
|
→ npm run serve:ssr crasht ❌
|
||||||
|
|
||||||
|
Lösung: → npm run build:ssr
|
||||||
|
→ index.server.html wird erstellt ✅
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### 4. `src/ssr-dom-polyfill.ts` - DOM-Mocks
|
||||||
|
|
||||||
|
```typescript
|
||||||
|
const windowMock = {
|
||||||
|
document: { createElement: () => ({ ... }) },
|
||||||
|
localStorage: { getItem: () => null },
|
||||||
|
navigator: { userAgent: 'node' },
|
||||||
|
// ... etc
|
||||||
|
};
|
||||||
|
|
||||||
|
if (typeof window === 'undefined') {
|
||||||
|
(global as any).window = windowMock;
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Rolle:**
|
||||||
|
- Simuliert Browser-APIs in Node.js
|
||||||
|
- Verhindert `ReferenceError: window is not defined`
|
||||||
|
- Ermöglicht die Ausführung von Browser-Code im Server
|
||||||
|
- Kritisch für Libraries wie Leaflet, die `window` erwarten
|
||||||
|
|
||||||
|
**Warum notwendig?**
|
||||||
|
- Angular-Code nutzt `window`, `document`, `localStorage`, etc.
|
||||||
|
- Node.js hat diese APIs nicht
|
||||||
|
- Ohne Polyfills: Crash beim Server-Start
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### 4. `ssr-dom-preload.mjs` - Node.js Preload Script
|
||||||
|
|
||||||
|
```javascript
|
||||||
|
import { isMainThread } from 'node:worker_threads';
|
||||||
|
|
||||||
|
if (!isMainThread) {
|
||||||
|
// Skip polyfills in worker threads (sass, esbuild)
|
||||||
|
} else {
|
||||||
|
globalThis.window = windowMock;
|
||||||
|
globalThis.document = documentMock;
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Rolle:**
|
||||||
|
- Wird beim `dev:ssr` verwendet
|
||||||
|
- Lädt DOM-Mocks **VOR** allen anderen Modulen
|
||||||
|
- Nutzt Node.js `--import` Flag
|
||||||
|
- Vermeidet Probleme mit early imports
|
||||||
|
|
||||||
|
**Verwendung:**
|
||||||
|
```bash
|
||||||
|
NODE_OPTIONS='--import ./ssr-dom-preload.mjs' ng serve
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### 5. `app.config.server.ts` - Server-spezifische Config
|
||||||
|
|
||||||
|
Enthält Provider, die nur im Server-Kontext geladen werden:
|
||||||
|
- `provideServerRendering()`
|
||||||
|
- Server-spezifische HTTP-Interceptors
|
||||||
|
- TransferState für API-Daten
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Rendering-Ablauf im Detail
|
||||||
|
|
||||||
|
### Phase 1: Server-Side Rendering
|
||||||
|
|
||||||
|
```
|
||||||
|
1. Request kommt an: GET /business/restaurant-123
|
||||||
|
|
||||||
|
2. Express Router:
|
||||||
|
→ server.get('*', ...)
|
||||||
|
|
||||||
|
3. AngularNodeAppEngine:
|
||||||
|
→ bootstrapApplication(AppComponent, serverConfig)
|
||||||
|
→ Angular läuft in Node.js
|
||||||
|
|
||||||
|
4. Angular Router:
|
||||||
|
→ Route /business/:slug matched
|
||||||
|
→ ListingDetailComponent wird aktiviert
|
||||||
|
|
||||||
|
5. Component Lifecycle:
|
||||||
|
→ ngOnInit() wird ausgeführt
|
||||||
|
→ API-Call: fetch('/api/listings/restaurant-123')
|
||||||
|
→ Daten werden geladen
|
||||||
|
→ Template wird mit Daten gerendert
|
||||||
|
|
||||||
|
6. TransferState:
|
||||||
|
→ API-Response wird in HTML injiziert
|
||||||
|
→ <script>window.__NG_STATE__ = {...}</script>
|
||||||
|
|
||||||
|
7. Meta-Tags:
|
||||||
|
→ Title-Service setzt <title>
|
||||||
|
→ Meta-Service setzt <meta name="description">
|
||||||
|
|
||||||
|
8. HTML-Output:
|
||||||
|
→ Komplettes HTML mit Daten
|
||||||
|
→ Wird an Browser gesendet
|
||||||
|
```
|
||||||
|
|
||||||
|
**Server-Output:**
|
||||||
|
```html
|
||||||
|
<!doctype html>
|
||||||
|
<html>
|
||||||
|
<head>
|
||||||
|
<title>Restaurant "Zum Löwen" | BizMatch</title>
|
||||||
|
<meta name="description" content="Traditionelles Restaurant...">
|
||||||
|
</head>
|
||||||
|
<body>
|
||||||
|
<app-root>
|
||||||
|
<!-- Vollständig gerenderte Component -->
|
||||||
|
<div class="listing-detail">
|
||||||
|
<h1>Restaurant "Zum Löwen"</h1>
|
||||||
|
<p>Adresse: Hauptstraße 1, München</p>
|
||||||
|
<!-- etc. -->
|
||||||
|
</div>
|
||||||
|
</app-root>
|
||||||
|
|
||||||
|
<!-- TransferState: verhindert doppelte API-Calls -->
|
||||||
|
<script id="ng-state" type="application/json">
|
||||||
|
{"listings":{"restaurant-123":{...}}}
|
||||||
|
</script>
|
||||||
|
|
||||||
|
<script src="main.js" defer></script>
|
||||||
|
</body>
|
||||||
|
</html>
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Phase 2: Client-Side Hydration
|
||||||
|
|
||||||
|
```
|
||||||
|
1. Browser empfängt HTML:
|
||||||
|
→ Zeigt sofort gerenderten Content an ✅
|
||||||
|
→ User sieht Inhalt ohne Verzögerung
|
||||||
|
|
||||||
|
2. JavaScript lädt:
|
||||||
|
→ main.js wird heruntergeladen
|
||||||
|
→ Angular-Runtime startet
|
||||||
|
|
||||||
|
3. Hydration beginnt:
|
||||||
|
→ Angular scannt DOM
|
||||||
|
→ Vergleicht Server-HTML mit Client-Template
|
||||||
|
→ Attachiert Event Listener
|
||||||
|
→ Aktiviert Interaktivität
|
||||||
|
|
||||||
|
4. TransferState wiederverwenden:
|
||||||
|
→ Liest window.__NG_STATE__
|
||||||
|
→ Überspringt erneute API-Calls ✅
|
||||||
|
→ Daten sind bereits vorhanden
|
||||||
|
|
||||||
|
5. App ist interaktiv:
|
||||||
|
→ Buttons funktionieren
|
||||||
|
→ Routing funktioniert
|
||||||
|
→ SPA-Verhalten aktiviert
|
||||||
|
```
|
||||||
|
|
||||||
|
**Wichtig:**
|
||||||
|
- **Kein Flickern** (Server-HTML = Client-HTML)
|
||||||
|
- **Keine doppelten API-Calls** (TransferState)
|
||||||
|
- **Schneller First Contentful Paint** (HTML sofort sichtbar)
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## SSR vs. Non-SSR: Was wird wann gerendert?
|
||||||
|
|
||||||
|
### Ohne SSR (`npm start`)
|
||||||
|
|
||||||
|
| Zeitpunkt | Server | Browser |
|
||||||
|
|-----------|--------|---------|
|
||||||
|
| T0: Request | Sendet leere `index.html` | - |
|
||||||
|
| T1: HTML empfangen | - | Leeres `<app-root></app-root>` |
|
||||||
|
| T2: JS geladen | - | Angular startet |
|
||||||
|
| T3: API-Call | - | Lädt Daten |
|
||||||
|
| T4: Rendering | - | **Erst jetzt sichtbar** ❌ |
|
||||||
|
|
||||||
|
**Time to First Contentful Paint:** ~2-3 Sekunden
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Mit SSR (`npm run serve:ssr`)
|
||||||
|
|
||||||
|
| Zeitpunkt | Server | Browser |
|
||||||
|
|-----------|--------|---------|
|
||||||
|
| T0: Request | Angular rendert + API-Call | - |
|
||||||
|
| T1: HTML empfangen | - | **Inhalt sofort sichtbar** ✅ |
|
||||||
|
| T2: JS geladen | - | Hydration beginnt |
|
||||||
|
| T3: Interaktiv | - | Event Listener attached |
|
||||||
|
|
||||||
|
**Time to First Contentful Paint:** ~200-500ms
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Prerendering vs. SSR: Wann wird gerendert?
|
||||||
|
|
||||||
|
### Prerendering (Static Site Generation)
|
||||||
|
|
||||||
|
```
|
||||||
|
Build-Zeit (npm run build):
|
||||||
|
→ ng build
|
||||||
|
→ Rendert /business/1.html
|
||||||
|
→ Rendert /business/2.html
|
||||||
|
→ Rendert /business/3.html
|
||||||
|
→ ...
|
||||||
|
→ Alle HTML-Dateien auf Server deployed
|
||||||
|
|
||||||
|
Request-Zeit:
|
||||||
|
→ Nginx sendet vorgefertigte HTML-Datei
|
||||||
|
→ KEIN Server-Side Rendering
|
||||||
|
```
|
||||||
|
|
||||||
|
**Vorteile:**
|
||||||
|
- Extrem schnell (statisches HTML)
|
||||||
|
- Kein Node.js-Server erforderlich
|
||||||
|
- Günstig (CDN-Hosting)
|
||||||
|
|
||||||
|
**Nachteile:**
|
||||||
|
- Nicht für dynamische Daten geeignet
|
||||||
|
- Re-Build bei jeder Änderung nötig
|
||||||
|
- Tausende Seiten = lange Build-Zeit
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### SSR (Server-Side Rendering)
|
||||||
|
|
||||||
|
```
|
||||||
|
Build-Zeit (npm run build:ssr):
|
||||||
|
→ ng build (Client-Bundles)
|
||||||
|
→ ng build (Server-Bundles)
|
||||||
|
→ KEINE HTML-Dateien generiert
|
||||||
|
|
||||||
|
Request-Zeit:
|
||||||
|
→ Node.js Server empfängt Request
|
||||||
|
→ Angular rendert HTML on-the-fly
|
||||||
|
→ Frische Daten aus DB
|
||||||
|
→ Sendet HTML zurück
|
||||||
|
```
|
||||||
|
|
||||||
|
**Vorteile:**
|
||||||
|
- Immer aktuelle Daten
|
||||||
|
- Personalisierte Inhalte
|
||||||
|
- Keine lange Build-Zeit
|
||||||
|
|
||||||
|
**Nachteile:**
|
||||||
|
- Server-Ressourcen erforderlich
|
||||||
|
- Langsamer als Prerendering (Rendering kostet Zeit)
|
||||||
|
- Komplexere Infrastruktur
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### BizMatch: Warum SSR statt Prerendering?
|
||||||
|
|
||||||
|
**Gründe:**
|
||||||
|
|
||||||
|
1. **Dynamische Listings:**
|
||||||
|
- Neue Businesses werden täglich hinzugefügt
|
||||||
|
- Prerendering würde tägliche Re-Builds erfordern
|
||||||
|
|
||||||
|
2. **Personalisierte Daten:**
|
||||||
|
- Benutzer sehen unterschiedliche Inhalte (Favoriten, etc.)
|
||||||
|
- Prerendering kann nicht personalisieren
|
||||||
|
|
||||||
|
3. **Suche und Filter:**
|
||||||
|
- Unendliche Kombinationen von Filtern
|
||||||
|
- Unmöglich, alle Varianten vorzurendern
|
||||||
|
|
||||||
|
4. **Skalierung:**
|
||||||
|
- 10.000+ Listings → Prerendering = 10.000+ HTML-Dateien
|
||||||
|
- SSR = 1 Server, rendert on-demand
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Client-Side Hydration im Detail
|
||||||
|
|
||||||
|
### Was ist Hydration?
|
||||||
|
|
||||||
|
**Hydration** = Angular "erweckt" das Server-HTML zum Leben.
|
||||||
|
|
||||||
|
**Ohne Hydration:**
|
||||||
|
- HTML ist statisch
|
||||||
|
- Buttons funktionieren nicht
|
||||||
|
- Routing funktioniert nicht
|
||||||
|
- Kein JavaScript-Event-Handling
|
||||||
|
|
||||||
|
**Nach Hydration:**
|
||||||
|
- Angular übernimmt Kontrolle
|
||||||
|
- Event Listener werden attached
|
||||||
|
- SPA-Routing funktioniert
|
||||||
|
- Interaktivität aktiviert
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Hydration-Ablauf
|
||||||
|
|
||||||
|
```typescript
|
||||||
|
// 1. Server rendert HTML
|
||||||
|
<button (click)="openModal()">Details</button>
|
||||||
|
|
||||||
|
// 2. Browser empfängt HTML
|
||||||
|
// → Button ist sichtbar, aber (click) funktioniert NICHT
|
||||||
|
|
||||||
|
// 3. Angular-JavaScript lädt
|
||||||
|
// → main.js wird ausgeführt
|
||||||
|
|
||||||
|
// 4. Hydration scannt DOM
|
||||||
|
angular.hydrate({
|
||||||
|
serverHTML: '<button>Details</button>',
|
||||||
|
clientTemplate: '<button (click)="openModal()">Details</button>',
|
||||||
|
|
||||||
|
// Vergleich: HTML matches Template? ✅
|
||||||
|
// → Reuse DOM node
|
||||||
|
// → Attach Event Listener
|
||||||
|
});
|
||||||
|
|
||||||
|
// 5. Button ist jetzt interaktiv
|
||||||
|
// → (click) funktioniert ✅
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Probleme bei Hydration
|
||||||
|
|
||||||
|
#### Problem 1: Mismatch zwischen Server und Client
|
||||||
|
|
||||||
|
**Ursache:**
|
||||||
|
```typescript
|
||||||
|
// Server rendert:
|
||||||
|
<div>Server Time: {{ serverTime }}</div>
|
||||||
|
|
||||||
|
// Client rendert:
|
||||||
|
<div>Server Time: {{ clientTime }}</div> // ← Unterschiedlich!
|
||||||
|
```
|
||||||
|
|
||||||
|
**Folge:**
|
||||||
|
- Angular erkennt Mismatch
|
||||||
|
- Wirft Warnung in Console
|
||||||
|
- Re-rendert Component (Performance-Verlust)
|
||||||
|
|
||||||
|
**Lösung:**
|
||||||
|
- TransferState nutzen für gemeinsame Daten
|
||||||
|
- `isPlatformServer()` für unterschiedliche Logik
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
#### Problem 2: Browser-only Code wird im Server ausgeführt
|
||||||
|
|
||||||
|
**Ursache:**
|
||||||
|
```typescript
|
||||||
|
ngOnInit() {
|
||||||
|
window.scrollTo(0, 0); // ← CRASH: window ist undefined im Server
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Lösung:**
|
||||||
|
```typescript
|
||||||
|
import { isPlatformBrowser } from '@angular/common';
|
||||||
|
import { PLATFORM_ID } from '@angular/core';
|
||||||
|
|
||||||
|
constructor(@Inject(PLATFORM_ID) private platformId: Object) {}
|
||||||
|
|
||||||
|
ngOnInit() {
|
||||||
|
if (isPlatformBrowser(this.platformId)) {
|
||||||
|
window.scrollTo(0, 0); // ← Nur im Browser
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## TransferState: Verhindert doppelte API-Calls
|
||||||
|
|
||||||
|
### Problem ohne TransferState
|
||||||
|
|
||||||
|
```
|
||||||
|
Server:
|
||||||
|
→ GET /api/listings/123 ← API-Call 1
|
||||||
|
→ Rendert HTML mit Daten
|
||||||
|
|
||||||
|
Browser (nach JS-Load):
|
||||||
|
→ GET /api/listings/123 ← API-Call 2 (doppelt!)
|
||||||
|
→ Re-rendert Component
|
||||||
|
```
|
||||||
|
|
||||||
|
**Problem:**
|
||||||
|
- Doppelter Netzwerk-Traffic
|
||||||
|
- Langsamere Hydration
|
||||||
|
- Flickern beim Re-Render
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Lösung: TransferState
|
||||||
|
|
||||||
|
**Server-Side:**
|
||||||
|
```typescript
|
||||||
|
import { TransferState, makeStateKey } from '@angular/platform-browser';
|
||||||
|
|
||||||
|
const LISTING_KEY = makeStateKey<Listing>('listing-123');
|
||||||
|
|
||||||
|
ngOnInit() {
|
||||||
|
this.http.get('/api/listings/123').subscribe(data => {
|
||||||
|
this.transferState.set(LISTING_KEY, data); // ← Speichern
|
||||||
|
this.listing = data;
|
||||||
|
});
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**HTML-Output:**
|
||||||
|
```html
|
||||||
|
<script id="ng-state" type="application/json">
|
||||||
|
{"listing-123": {"name": "Restaurant", "address": "..."}}
|
||||||
|
</script>
|
||||||
|
```
|
||||||
|
|
||||||
|
**Client-Side:**
|
||||||
|
```typescript
|
||||||
|
ngOnInit() {
|
||||||
|
const cachedData = this.transferState.get(LISTING_KEY, null);
|
||||||
|
|
||||||
|
if (cachedData) {
|
||||||
|
this.listing = cachedData; // ← Wiederverwenden ✅
|
||||||
|
} else {
|
||||||
|
this.http.get('/api/listings/123').subscribe(...); // ← Nur wenn nicht cached
|
||||||
|
}
|
||||||
|
|
||||||
|
this.transferState.remove(LISTING_KEY); // ← Cleanup
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
**Ergebnis:**
|
||||||
|
- ✅ Nur 1 API-Call (serverseitig)
|
||||||
|
- ✅ Kein Flickern
|
||||||
|
- ✅ Schnellere Hydration
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Performance-Vergleich
|
||||||
|
|
||||||
|
### Metriken
|
||||||
|
|
||||||
|
| Metrik | Ohne SSR | Mit SSR | Verbesserung |
|
||||||
|
|--------|----------|---------|--------------|
|
||||||
|
| **Time to First Byte (TTFB)** | 50ms | 200ms | -150ms ❌ |
|
||||||
|
| **First Contentful Paint (FCP)** | 2.5s | 0.5s | **-2s ✅** |
|
||||||
|
| **Largest Contentful Paint (LCP)** | 3.2s | 0.8s | **-2.4s ✅** |
|
||||||
|
| **Time to Interactive (TTI)** | 3.5s | 2.8s | -0.7s ✅ |
|
||||||
|
| **SEO Score (Lighthouse)** | 60 | 95 | +35 ✅ |
|
||||||
|
|
||||||
|
**Wichtig:**
|
||||||
|
- TTFB ist langsamer (Server muss rendern)
|
||||||
|
- Aber FCP viel schneller (HTML sofort sichtbar)
|
||||||
|
- User-Wahrnehmung: SSR fühlt sich schneller an
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## SEO-Vorteile
|
||||||
|
|
||||||
|
### Google Crawler
|
||||||
|
|
||||||
|
**Ohne SSR:**
|
||||||
|
```html
|
||||||
|
<!-- Google sieht nur: -->
|
||||||
|
<app-root></app-root>
|
||||||
|
<script src="main.js"></script>
|
||||||
|
```
|
||||||
|
|
||||||
|
→ ❌ Kein Content indexiert
|
||||||
|
→ ❌ Kein Ranking
|
||||||
|
→ ❌ Keine Rich Snippets
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
**Mit SSR:**
|
||||||
|
```html
|
||||||
|
<!-- Google sieht: -->
|
||||||
|
<title>Restaurant "Zum Löwen" | BizMatch</title>
|
||||||
|
<meta name="description" content="Traditionelles Restaurant in München">
|
||||||
|
<h1>Restaurant "Zum Löwen"</h1>
|
||||||
|
<p>Adresse: Hauptstraße 1, 80331 München</p>
|
||||||
|
<div itemscope itemtype="https://schema.org/Restaurant">
|
||||||
|
<span itemprop="name">Restaurant "Zum Löwen"</span>
|
||||||
|
<span itemprop="address">München</span>
|
||||||
|
</div>
|
||||||
|
```
|
||||||
|
|
||||||
|
→ ✅ Vollständiger Content indexiert
|
||||||
|
→ ✅ Besseres Ranking
|
||||||
|
→ ✅ Rich Snippets (Sterne, Adresse, etc.)
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
### Social Media Previews (Open Graph)
|
||||||
|
|
||||||
|
**Ohne SSR:**
|
||||||
|
```html
|
||||||
|
<!-- Facebook/Twitter sehen nur: -->
|
||||||
|
<title>BizMatch</title>
|
||||||
|
```
|
||||||
|
|
||||||
|
→ ❌ Kein Preview-Bild
|
||||||
|
→ ❌ Keine Beschreibung
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
**Mit SSR:**
|
||||||
|
```html
|
||||||
|
<meta property="og:title" content="Restaurant 'Zum Löwen'" />
|
||||||
|
<meta property="og:description" content="Traditionelles Restaurant..." />
|
||||||
|
<meta property="og:image" content="https://bizmatch.net/images/restaurant.jpg" />
|
||||||
|
<meta property="og:url" content="https://bizmatch.net/business/restaurant-123" />
|
||||||
|
```
|
||||||
|
|
||||||
|
→ ✅ Schönes Preview beim Teilen
|
||||||
|
→ ✅ Mehr Klicks
|
||||||
|
→ ✅ Bessere User Experience
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
## Zusammenfassung
|
||||||
|
|
||||||
|
### SSR in BizMatch bedeutet:
|
||||||
|
|
||||||
|
1. **Server rendert HTML vorab** (nicht erst im Browser)
|
||||||
|
2. **Browser zeigt sofort Inhalt** (schneller First Paint)
|
||||||
|
3. **JavaScript hydrated im Hintergrund** (macht HTML interaktiv)
|
||||||
|
4. **Kein Flickern, keine doppelten API-Calls** (TransferState)
|
||||||
|
5. **Besseres SEO** (Google sieht vollständigen Content)
|
||||||
|
6. **Social-Media-Previews funktionieren** (Open Graph Tags)
|
||||||
|
|
||||||
|
### Technischer Stack:
|
||||||
|
|
||||||
|
- **@angular/ssr**: SSR-Engine
|
||||||
|
- **Express**: HTTP-Server
|
||||||
|
- **AngularNodeAppEngine**: Rendert Angular in Node.js
|
||||||
|
- **ssr-dom-polyfill.ts**: Simuliert Browser-APIs
|
||||||
|
- **TransferState**: Verhindert doppelte API-Calls
|
||||||
|
|
||||||
|
### Wann wird was gerendert?
|
||||||
|
|
||||||
|
- **Build-Zeit:** Nichts (kein Prerendering)
|
||||||
|
- **Request-Zeit:** Server rendert HTML on-the-fly
|
||||||
|
- **Nach JS-Load:** Hydration macht HTML interaktiv
|
||||||
|
|
||||||
|
### Best Practices:
|
||||||
|
|
||||||
|
1. Browser-Code mit `isPlatformBrowser()` schützen
|
||||||
|
2. TransferState für API-Daten nutzen
|
||||||
|
3. DOM-Polyfills für Third-Party-Libraries
|
||||||
|
4. Meta-Tags serverseitig setzen
|
||||||
|
5. Server-Build vor Deployment testen
|
||||||
Loading…
Reference in New Issue