implementation of a new Framework for the Barcode scanning via Quagga2 -> only test implementation

.github/workflows/release-docker.yml

@@ -15,15 +15,6 @@ on:
           - patch
           - minor
           - major
-          - development
-      push_dev:
-        description: "If true, push the :dev image to GHCR for development releases"
-        required: false
-        default: "false"
-        type: choice
-        options:
-          - "true"
-          - "false"
 
 permissions:
   contents: write
@@ -48,13 +39,12 @@ jobs:
           EVENT_NAME: ${{ github.event_name }}
           REF_NAME: ${{ github.ref_name }}
           BUMP_TYPE: ${{ github.event.inputs.bump || 'patch' }}
-          PUSH_DEV: ${{ github.event.inputs.push_dev || 'false' }}
         run: |
           if [ "$EVENT_NAME" = "push" ] && [ -n "$REF_NAME" ]; then
             TAG="$REF_NAME"
           else
-            # Fetch latest release tag via GitHub API (fall back to v3.0.0)
-            latest_tag="v3.0.0"
+            # Fetch latest release tag via GitHub API (fall back to v0.8.31)
+            latest_tag="v0.8.31"
             if meta_json=$(curl -fsSL -H "Authorization: Bearer $GH_TOKEN" -H "Accept: application/vnd.github+json" "https://api.github.com/repos/$REPO/releases/latest" 2>/dev/null); then
               tag_name=$(printf "%s" "$meta_json" | sed -n 's/.*"tag_name"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' | head -n1)
               if [ -n "$tag_name" ]; then
@@ -67,7 +57,7 @@ jobs:
               minor=${BASH_REMATCH[2]}
               patch=${BASH_REMATCH[3]}
             else
-              major=3; minor=0; patch=0
+              major=0; minor=8; patch=31
             fi
 
             # Bump strategy: major / minor / patch
@@ -78,30 +68,28 @@ jobs:
             else
               patch=$((patch + 1))
             fi
-
-            if [ "${BUMP_TYPE:-}" = "development" ]; then
-              TAG="v${major}.${minor}.${patch}-dev"
-            else
-              TAG="v${major}.${minor}.${patch}"
-            fi
+            
+            # Zusammenbau des Tags für den manuellen Run
+            TAG="v${major}.${minor}.${patch}"
           fi
 
+          # Validierung des erzeugten oder übergebenen Tags
           if ! echo "$TAG" | grep -Eq '^v[0-9]+\.[0-9]+\.[0-9]+(-dev(\.[0-9]+)?)?$'; then
-            echo "Error: tag '$TAG' is not valid semver (vX.Y.Z or vX.Y.Z-dev)"
+            echo "Error: tag '$TAG' is not valid semver (vX.Y.Z)"
             exit 1
           fi
 
           git fetch --tags --force
           LATEST_TAG="$(git tag -l 'v*' | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' | sort -V | tail -n1)"
           if [ -z "$LATEST_TAG" ]; then
-            LATEST_TAG="v3.0.0"
+            LATEST_TAG="v0.8.31"
           fi
 
           TAG_MAJOR="${TAG#v}"
           TAG_MAJOR="${TAG_MAJOR%%.*}"
           LATEST_MAJOR="$(echo "$LATEST_TAG" | grep -Eo '^v[0-9]+' | tr -d 'v')"
           if [ -z "$LATEST_MAJOR" ]; then
-            LATEST_MAJOR="3"
+            LATEST_MAJOR="0"
           fi
 
           # If not explicitly bumping major, disallow changing major version
@@ -123,33 +111,6 @@ jobs:
           IMAGE="ghcr.io/aiirondev/legendary-octo-garbanzo:${TAG}"
           echo "tag=$TAG" >> "$GITHUB_OUTPUT"
           echo "image=$IMAGE" >> "$GITHUB_OUTPUT"
-          if [ "${BUMP_TYPE:-}" = "development" ]; then
-            echo "is_development=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "is_development=false" >> "$GITHUB_OUTPUT"
-          fi
-          if [ "${BUMP_TYPE:-}" = "development" ] && [ "${PUSH_DEV:-}" = "true" ]; then
-            echo "push_dev=true" >> "$GITHUB_OUTPUT"
-          else
-            echo "push_dev=false" >> "$GITHUB_OUTPUT"
-          fi
-
-      - name: Update .release-version file
-        run: |
-          echo "${{ steps.meta.outputs.tag }}" > .release-version
-          cat .release-version
-
-      - name: Create and push tag for manual releases
-        if: github.event_name == 'workflow_dispatch'
-        run: |
-          TAG="${{ steps.meta.outputs.tag }}"
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add .release-version
-          git commit -m "chore: bump version to $TAG" || true
-          git tag "$TAG"
-          git push origin "$TAG"
-          git push origin HEAD:${{ github.ref_name }}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -162,26 +123,16 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push release image
-        if: steps.meta.outputs.is_development != 'true'
         uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile
           push: true
+          load: true # Lädt das Image in den lokalen Docker-Daemon für den 'docker save' Schritt
           tags: |
             ${{ steps.meta.outputs.image }}
             ghcr.io/aiirondev/legendary-octo-garbanzo:latest
 
-      - name: Build and push development image (:dev)
-        if: steps.meta.outputs.is_development == 'true' && steps.meta.outputs.push_dev == 'true'
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: ./Dockerfile
-          push: true
-          tags: |
-            ghcr.io/aiirondev/legendary-octo-garbanzo:dev
-
       - name: Build local image tar for offline deploy
         run: |
           set -euo pipefail
@@ -204,30 +155,17 @@ jobs:
           docker build -t "$IMG" .
           docker save "$IMG" | gzip > "inventarsystem-image-${TAG}.tar.gz"
 
-      # development tar omitted: dev releases will be versioned (vX.Y.Z-dev) and handled by update.sh using the tag
-
-      - name: Commit .release-version for tag pushes
-        if: github.event_name == 'push'
-        run: |
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          if ! git diff --quiet .release-version; then
-            git add .release-version
-            git commit -m "chore: update version to ${{ steps.meta.outputs.tag }}"
-            git push origin HEAD:${{ github.ref_name }}
-          fi
-
       - name: Create release-only docker bundle
         run: |
           mkdir -p release-bundle
           cat > release-bundle/docker-compose.yml <<EOF
           services:
             app:
-              image: ${INVENTAR_APP_IMAGE:-ghcr.io/aiirondev/legendary-octo-garbanzo:${{ steps.meta.outputs.tag }}}
+              image: \${INVENTAR_APP_IMAGE:-ghcr.io/aiirondev/legendary-octo-garbanzo:${{ steps.meta.outputs.tag }}}
               container_name: inventarsystem-app
               restart: unless-stopped
               ports:
-                - "${INVENTAR_HTTP_PORT:-10000}:8000"
+                - "\${INVENTAR_HTTP_PORT:-10000}:8000"
               depends_on:
                 - mongodb
                 - redis
@@ -300,17 +238,6 @@ jobs:
             fi
           done
 
-          cat > release-bundle/DEVELOPMENT.md <<EOF
-          This is a development prerelease bundle for tag: ${{ steps.meta.outputs.tag }}
-
-          This prerelease is intentionally separate from normal releases and will not be used by default.
-
-          To install this prerelease on a target host run:
-
-            ./update.sh ${{ steps.meta.outputs.tag }}
-
-          EOF
-
           # Make any shipped scripts executable
           find release-bundle -maxdepth 1 -type f -name '*.sh' -exec chmod +x {} \; || true
           tar -czf inventarsystem-docker-bundle.tar.gz -C release-bundle .
@@ -319,10 +246,8 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           tag_name: ${{ steps.meta.outputs.tag }}
-          prerelease: ${{ steps.meta.outputs.is_development }}
           files: |
             inventarsystem-docker-bundle.tar.gz
             inventarsystem-image-${{ steps.meta.outputs.tag }}.tar.gz
-            inventarsystem-image-dev.tar.gz
           fail_on_unmatched_files: false
-          generate_release_notes: true
+          generate_release_notes: true

.release-version

@@ -1 +1 @@
-v0.8.30
+v0.8.31.1

Web/app.py

@@ -3484,66 +3484,6 @@ def api_library_scan_action():
             client.close()
 
 
-@app.route('/api/scan_upload', methods=['POST'])
-def api_scan_upload():
-    """
-    Server-side barcode/QR decoding endpoint.
-    Accepts image upload and returns detected barcodes (fallback for client-side scanner).
-    """
-    if 'username' not in session:
-        return jsonify({'ok': False, 'message': 'Nicht angemeldet.'}), 401
-
-    try:
-        from pyzbar.pyzbar import decode
-        from PIL import Image
-        import io
-    except ImportError:
-        return jsonify({'ok': False, 'message': 'pyzbar library not installed on server.'}), 500
-
-    if 'image' not in request.files:
-        return jsonify({'ok': False, 'message': 'Keine Bilddatei bereitgestellt.'}), 400
-
-    file = request.files['image']
-    if file.filename == '':
-        return jsonify({'ok': False, 'message': 'Datei ist leer.'}), 400
-
-    try:
-        # Decode image
-        image = Image.open(io.BytesIO(file.read()))
-        image = image.convert('RGB')
-
-        # Detect barcodes using pyzbar
-        results = decode(image)
-
-        if not results:
-            return jsonify({'ok': False, 'message': 'Kein Barcode im Bild erkannt.'}), 400
-
-        # Return all detected barcodes, sorted by confidence (quality)
-        barcodes = [
-            {
-                'type': result.type,
-                'value': result.data.decode('utf-8'),
-                'rect': {
-                    'x': result.rect.left,
-                    'y': result.rect.top,
-                    'width': result.rect.width,
-                    'height': result.rect.height,
-                }
-            }
-            for result in results
-        ]
-
-        return jsonify({
-            'ok': True,
-            'barcodes': barcodes,
-            'message': f'{len(barcodes)} Barcode(s) erkannt.'
-        }), 200
-
-    except Exception as e:
-        app.logger.error(f"Error decoding barcode image: {e}")
-        return jsonify({'ok': False, 'message': f'Fehler beim Dekodieren: {str(e)}'}), 500
-
-
 @app.route('/api/item_detail/<item_id>')
 def api_item_detail(item_id):
     """

Web/requirements.txt

@@ -15,4 +15,3 @@ openpyxl
 cryptography>=42.0.0
 pywebpush
 py-vapid>=1.9.0
-pyzbar

Web/static/js/scanner.js

@@ -1,328 +0,0 @@
-/**
- * Hybrid Barcode Scanner
- * Supports: Real-time camera scanning (ZXing.js), image upload fallback (server-side pyzbar),
- *           and USB/keyboard scanner emulation.
- */
-
-class HybridScanner {
-  constructor(options = {}) {
-    this.options = {
-      videoId: options.videoId || 'scanner-video',
-      canvasId: options.canvasId || 'scanner-canvas',
-      formats: options.formats || ['QR_CODE', 'CODE_128', 'EAN_13', 'ISBN', 'CODE_39', 'UPC_A'],
-      fps: options.fps || 10,
-      onSuccess: options.onSuccess || (() => {}),
-      onError: options.onError || (() => {}),
-      facingMode: options.facingMode || 'environment', // 'environment' for rear, 'user' for front
-    };
-
-    this.state = {
-      isRunning: false,
-      stream: null,
-      reader: null,
-      canvas: null,
-      videoElement: null,
-      zxingReady: false,
-      lastScanTime: 0,
-      scanDebounceMs: 300, // Prevent rapid duplicate scans
-    };
-
-    this.keyboardInputBuffer = '';
-    this.keyboardInputTimeout = null;
-  }
-
-  /**
-   * Initialize ZXing library from CDN
-   */
-  async initZXing() {
-    if (this.state.zxingReady) {
-      return true;
-    }
-
-    return new Promise((resolve) => {
-      // Load ZXing library from CDN
-      if (typeof ZXing !== 'undefined') {
-        this.state.zxingReady = true;
-        resolve(true);
-        return;
-      }
-
-      // Use fallback URL for better mobile compatibility
-      let scriptUrl = 'https://unpkg.com/@zxing/library@latest/umd/index.min.js';
-      
-      // Check if already loading
-      const existingScript = document.querySelector(`script[src="${scriptUrl}"]`);
-      if (existingScript) {
-        existingScript.addEventListener('load', () => {
-          this.state.zxingReady = typeof ZXing !== 'undefined';
-          resolve(this.state.zxingReady);
-        }, { once: true });
-        existingScript.addEventListener('error', () => {
-          console.error('Failed to load ZXing library');
-          resolve(false);
-        }, { once: true });
-        return;
-      }
-
-      const script = document.createElement('script');
-      script.src = scriptUrl;
-      script.async = true;
-      script.onload = () => {
-        this.state.zxingReady = typeof ZXing !== 'undefined';
-        resolve(this.state.zxingReady);
-      };
-      script.onerror = () => {
-        console.error('Failed to load ZXing library');
-        resolve(false);
-      };
-      document.head.appendChild(script);
-    });
-  }
-
-  /**
-   * Start real-time barcode scanning via camera
-   */
-  async start() {
-    if (this.state.isRunning) {
-      return;
-    }
-
-    try {
-      // Ensure ZXing is loaded
-      const zxingReady = await this.initZXing();
-      if (!zxingReady) {
-        this.options.onError('ZXing library failed to load. Please use image upload fallback.');
-        return;
-      }
-
-      // Get DOM elements
-      this.state.videoElement = document.getElementById(this.options.videoId);
-      this.state.canvas = document.getElementById(this.options.canvasId);
-
-      if (!this.state.videoElement || !this.state.canvas) {
-        this.options.onError('Scanner video or canvas element not found.');
-        return;
-      }
-
-      // Request camera access
-      const stream = await navigator.mediaDevices.getUserMedia({
-        video: {
-          facingMode: this.options.facingMode,
-          width: { ideal: 1280 },
-          height: { ideal: 720 },
-        },
-        audio: false,
-      });
-
-      this.state.stream = stream;
-      this.state.videoElement.srcObject = stream;
-      
-      // Make video element visible (ensure it's not hidden by display: none)
-      this.state.videoElement.style.display = 'block';
-
-      // Initialize ZXing reader
-      const hints = new Map();
-      hints.set(ZXing.DecodeHintType.POSSIBLE_FORMATS, this.options.formats);
-      hints.set(ZXing.DecodeHintType.TRY_HARDER, true);
-      this.state.reader = new ZXing.BrowserMultiFormatReader(hints);
-
-      this.state.isRunning = true;
-
-      // Start scanning loop
-      this.scanLoop();
-
-      // Setup keyboard input fallback for USB scanners
-      this.setupKeyboardInput();
-    } catch (err) {
-      this.options.onError(`Camera error: ${err.message || err}`);
-    }
-  }
-
-  /**
-   * Stop barcode scanning
-   */
-  stop() {
-    if (!this.state.isRunning) {
-      return;
-    }
-
-    this.state.isRunning = false;
-
-    if (this.state.stream) {
-      this.state.stream.getTracks().forEach((track) => track.stop());
-      this.state.stream = null;
-    }
-
-    if (this.state.videoElement) {
-      this.state.videoElement.srcObject = null;
-      this.state.videoElement.style.display = 'none';
-    }
-
-    this.removeKeyboardInput();
-  }
-
-  /**
-   * Main scanning loop for real-time frame processing
-   */
-  scanLoop() {
-    if (!this.state.isRunning) {
-      return;
-    }
-
-    const canvas = this.state.canvas;
-    const video = this.state.videoElement;
-
-    if (!video || !canvas) {
-      setTimeout(() => this.scanLoop(), 100);
-      return;
-    }
-
-    if (video.readyState === video.HAVE_ENOUGH_DATA) {
-      try {
-        canvas.width = video.videoWidth;
-        canvas.height = video.videoHeight;
-        
-        if (canvas.width === 0 || canvas.height === 0) {
-          setTimeout(() => this.scanLoop(), 100);
-          return;
-        }
-
-        const context = canvas.getContext('2d');
-
-        if (context) {
-          context.drawImage(video, 0, 0);
-
-          try {
-            const luminanceSource = new ZXing.HTMLCanvasElementLuminanceSource(canvas);
-            const binaryBitmap = new ZXing.BinaryBitmap(new ZXing.HybridBinarizer(luminanceSource));
-
-            try {
-              const result = this.state.reader.decodeFromBitmap(binaryBitmap);
-              this.handleScanResult(result.text);
-            } catch (e) {
-              // No barcode found in frame; continue scanning
-            }
-          } catch (err) {
-            // Silently ignore canvas errors
-          }
-        }
-      } catch (err) {
-        console.warn('Scan loop error:', err);
-      }
-    }
-
-    // Throttle scan loop based on FPS setting
-    setTimeout(() => this.scanLoop(), 1000 / this.options.fps);
-  }
-
-  /**
-   * Handle successful barcode scan with debouncing
-   */
-  handleScanResult(scannedText) {
-    const now = Date.now();
-    if (now - this.state.lastScanTime < this.state.scanDebounceMs) {
-      return; // Ignore rapid duplicates
-    }
-
-    this.state.lastScanTime = now;
-    this.options.onSuccess(scannedText.trim());
-  }
-
-  /**
-   * Setup keyboard input listener for USB scanner emulation
-   * Most USB scanners emulate keyboard input (barcode followed by Enter)
-   */
-  setupKeyboardInput() {
-    this.keyboardListener = (event) => {
-      // Allow only alphanumeric, dash, colon (common in barcodes)
-      if (/^[a-zA-Z0-9:_\-]$/.test(event.key)) {
-        event.preventDefault();
-        this.keyboardInputBuffer += event.key;
-
-        // Reset timeout for multi-part barcodes
-        if (this.keyboardInputTimeout) {
-          clearTimeout(this.keyboardInputTimeout);
-        }
-      } else if (event.key === 'Enter') {
-        event.preventDefault();
-        if (this.keyboardInputBuffer.length > 0) {
-          this.handleScanResult(this.keyboardInputBuffer);
-          this.keyboardInputBuffer = '';
-        }
-      } else if (event.key === 'Escape') {
-        this.keyboardInputBuffer = '';
-        this.stop();
-      }
-
-      // Auto-trigger if buffer looks complete (common barcode lengths)
-      if ([8, 12, 13, 17].includes(this.keyboardInputBuffer.length)) {
-        this.keyboardInputTimeout = setTimeout(() => {
-          if (this.keyboardInputBuffer.length > 0) {
-            this.handleScanResult(this.keyboardInputBuffer);
-            this.keyboardInputBuffer = '';
-          }
-        }, 200);
-      }
-    };
-
-    document.addEventListener('keydown', this.keyboardListener);
-  }
-
-  /**
-   * Remove keyboard input listener
-   */
-  removeKeyboardInput() {
-    if (this.keyboardListener) {
-      document.removeEventListener('keydown', this.keyboardListener);
-      this.keyboardListener = null;
-    }
-    this.keyboardInputBuffer = '';
-  }
-
-  /**
-   * Upload image for server-side decoding (fallback)
-   * Requires /api/scan_upload endpoint
-   */
-  static async uploadImageForDecoding(file, onSuccess, onError) {
-    try {
-      const formData = new FormData();
-      formData.append('image', file);
-
-      const response = await fetch('/api/scan_upload', {
-        method: 'POST',
-        body: formData,
-      });
-
-      const data = await response.json();
-
-      if (data.ok && data.barcodes && data.barcodes.length > 0) {
-        // Return first detected barcode (highest confidence)
-        onSuccess(data.barcodes[0].value);
-      } else {
-        onError(data.message || 'No barcode detected in image.');
-      }
-    } catch (err) {
-      onError(`Upload error: ${err.message}`);
-    }
-  }
-
-  /**
-   * Toggle camera (front/rear on mobile)
-   */
-  toggleCamera() {
-    if (this.options.facingMode === 'environment') {
-      this.options.facingMode = 'user';
-    } else {
-      this.options.facingMode = 'environment';
-    }
-
-    // Restart scanning with new camera
-    this.stop();
-    this.start();
-  }
-}
-
-// Export for use in templates
-if (typeof window !== 'undefined') {
-  window.HybridScanner = HybridScanner;
-}

Web/templates/library.html

@@ -67,22 +67,8 @@
 
     <!-- Scanner Panel -->
     <div id="qrContainer" class="qr-container" style="display: none;">
-        <div class="scanner-header">
-            <h3>Barcode/QR-Code Scanner</h3>
-            <div class="scanner-controls">
-                <button type="button" id="cameraToggle" class="scanner-button" title="Kamera wechseln">📷 Kamera</button>
-                <label for="uploadScanImage" class="scanner-button" title="Bild hochladen zum Dekodieren">📤 Upload</label>
-                <input type="file" id="uploadScanImage" accept="image/*" style="display: none;">
-            </div>
-        </div>
-        <div class="scanner-video-wrapper">
-            <video id="qr-reader" playsinline style="width: 100%; max-width: 100%; height: auto; aspect-ratio: 4/3; object-fit: cover; border-radius: 8px;"></video>
-            <canvas id="scanner-canvas" style="display: none;"></canvas>
-        </div>
-        <div id="scanMessage" class="scanner-message" style="margin-top: 10px; text-align: center; font-weight: bold; color: #666;"></div>
-        <p style="font-size: 0.85em; color: #999; margin-top: 10px; margin-bottom: 0; text-align: center;">
-            💡 Hinweis: Scan-Ergebnis wird automatisch in das Feld oben übernommen. USB-Scanner werden als Tastatureingabe erkannt.
-        </p>
+        <div id="qr-reader" style="width: auto; height: 300px;"></div>
+        <span id="qr-result" style="display: none;"></span>
     </div>
 
     <!-- Table Header (only in table mode) -->
@@ -220,8 +206,7 @@
     </div>
 </div>
 
-<script src="https://unpkg.com/@zxing/library@latest/umd/index.min.js"></script>
-<script src="/static/js/scanner.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/html5-qrcode/minified/html5-qrcode.min.js"></script>
 <script>
 // View mode persistence
 const LIBRARY_VIEW_MODE_KEY = 'inventarLibraryViewMode';
@@ -646,9 +631,8 @@ document.getElementById('favoriteToggle').addEventListener('click', function() {
     // TODO: Implement favorites filtering
 });
 
-// Scanner instance (hybrid: real-time + upload + keyboard)
+// Scanner toggle
 let scanner = null;
-
 document.getElementById('scannerBtn').addEventListener('click', function(e) {
     e.stopPropagation();
     const container = document.getElementById('qrContainer');
@@ -656,10 +640,7 @@ document.getElementById('scannerBtn').addEventListener('click', function(e) {
     
     if (isOpen) {
         container.style.display = 'none';
-        if (scanner) {
-            scanner.stop();
-            scanner = null;
-        }
+        if (scanner) scanner.clear();
         this.classList.remove('open');
         this.setAttribute('aria-expanded', 'false');
     } else {
@@ -668,66 +649,17 @@ document.getElementById('scannerBtn').addEventListener('click', function(e) {
         this.setAttribute('aria-expanded', 'true');
         
         if (!scanner) {
-            initScanner();
+            scanner = new Html5Qrcode('qr-reader');
+            scanner.start(
+                { facingMode: "environment" },
+                { fps: 10, qrbox: 250 },
+                onScanSuccess,
+                onScanError
+            );
         }
     }
 });
 
-function initScanner() {
-    scanner = new HybridScanner({
-        videoId: 'qr-reader',
-        canvasId: 'scanner-canvas',
-        formats: ['QR_CODE', 'CODE_128', 'EAN_13', 'ISBN', 'CODE_39', 'UPC_A', 'EAN_8'],
-        fps: 10,
-        facingMode: 'environment',
-        onSuccess: function(decodedText) {
-            const studentId = decodedText.trim();
-            document.getElementById('studentIdInput').value = studentId;
-            document.getElementById('scanMessage').textContent = '✓ Erkannt: ' + studentId;
-            document.getElementById('scanMessage').style.color = '#4CAF50';
-        },
-        onError: function(error) {
-            document.getElementById('scanMessage').textContent = '✗ ' + error;
-            document.getElementById('scanMessage').style.color = '#f44336';
-        }
-    });
-
-    scanner.start();
-}
-
-// Camera toggle
-document.getElementById('cameraToggle')?.addEventListener('click', function() {
-    if (scanner) {
-        scanner.toggleCamera();
-        this.textContent = scanner.options.facingMode === 'user' ? '📷 Rückkamera' : '🤳 Frontkamera';
-    }
-});
-
-// Image upload fallback
-document.getElementById('uploadScanImage')?.addEventListener('change', function(e) {
-    const file = e.target.files[0];
-    if (file) {
-        const messageEl = document.getElementById('scanMessage');
-        messageEl.textContent = 'Wird dekodiert...';
-        messageEl.style.color = '#2196F3';
-        
-        HybridScanner.uploadImageForDecoding(
-            file,
-            (decodedText) => {
-                document.getElementById('studentIdInput').value = decodedText;
-                messageEl.textContent = '✓ Erkannt (Upload): ' + decodedText;
-                messageEl.style.color = '#4CAF50';
-                e.target.value = ''; // Reset file input
-            },
-            (error) => {
-                messageEl.textContent = '✗ ' + error;
-                messageEl.style.color = '#f44336';
-                e.target.value = '';
-            }
-        );
-    }
-});
-
 function onScanSuccess(decodedText, decodedResult) {
     const studentId = decodedText.trim();
     document.getElementById('studentIdInput').value = studentId;
@@ -797,9 +729,6 @@ function onScanError(error) {
         overflow-x: auto;
         -webkit-overflow-scrolling: touch;
         width: 100%;
-        box-sizing: border-box;
-        margin: 0 -12px;
-        padding: 0 12px;
     }
     .library-table-wrapper .table-row {
         min-width: 720px; /* allow table to have intrinsic width and be scrolled */
@@ -808,129 +737,5 @@ function onScanError(error) {
         display: block; /* keep rows stacked but allow horizontal scroll */
     }
 }
-
-/* Hybrid Scanner Styles */
-.qr-container {
-    background: #f5f5f5;
-    border: 1px solid #ddd;
-    border-radius: 8px;
-    padding: 12px;
-    margin: 12px 0;
-    overflow-x: hidden;
-    width: 100%;
-    box-sizing: border-box;
-}
-
-.scanner-header {
-    display: flex;
-    justify-content: flex-start;
-    align-items: center;
-    margin-bottom: 12px;
-    flex-wrap: wrap;
-    gap: 8px;
-    width: 100%;
-    box-sizing: border-box;
-}
-
-.scanner-header h3 {
-    margin: 0;
-    color: #333;
-    font-size: 1em;
-    flex: 0 0 auto;
-    white-space: nowrap;
-}
-
-.scanner-controls {
-    display: flex;
-    gap: 6px;
-    flex-wrap: wrap;
-    flex: 1 1 auto;
-    min-width: 0;
-}
-
-.scanner-button {
-    background: #2196F3;
-    color: white;
-    border: none;
-    padding: 6px 10px;
-    border-radius: 4px;
-    cursor: pointer;
-    font-size: 0.85em;
-    white-space: nowrap;
-    flex: 0 1 auto;
-    transition: background-color 0.2s;
-}
-
-.scanner-button:hover {
-    background: #1976D2;
-}
-
-.scanner-button:active {
-    background: #1565C0;
-}
-
-.scanner-video-wrapper {
-    display: flex;
-    justify-content: center;
-    align-items: center;
-    margin: 12px 0;
-    width: 100%;
-    box-sizing: border-box;
-    overflow: hidden;
-}
-
-#qr-reader {
-    width: 100%;
-    max-width: 100%;
-    height: auto;
-    border: 2px solid #2196F3;
-    border-radius: 8px;
-    display: block;
-}
-
-.scanner-message {
-    min-height: 20px;
-    font-size: 0.9em;
-    text-align: center;
-    word-wrap: break-word;
-}
-
-@media (max-width: 600px) {
-    .qr-container {
-        padding: 10px;
-        margin: 10px 0;
-    }
-
-    .scanner-header {
-        flex-direction: column;
-        align-items: stretch;
-        gap: 8px;
-    }
-
-    .scanner-header h3 {
-        width: 100%;
-        font-size: 0.95em;
-    }
-
-    .scanner-controls {
-        width: 100%;
-        justify-content: space-between;
-    }
-
-    .scanner-button {
-        flex: 1 1 auto;
-        padding: 8px 6px;
-        font-size: 0.8em;
-    }
-
-    #qr-reader {
-        max-width: 100%;
-        border-radius: 6px;
-    }
-
-    .scanner-message {
-        font-size: 0.85em;
-    }
-}
 </style>
 {% endblock %}

Web/templates/library_table.html

@@ -459,10 +459,7 @@
             Hinweis: Im Schnellmodus zuerst den Schülerausweis scannen, danach den Buch-/Mediencode.
         </div>
         <div id="scanReaderWrap" class="library-scan-reader-wrap">
-            <div id="libraryQrReader" class="library-scan-reader">
-                <video id="libraryQrReaderVideo" playsinline style="width: 100%; border-radius: 8px;"></video>
-                <canvas id="libraryQrReaderCanvas" style="display: none;"></canvas>
-            </div>
+            <div id="libraryQrReader" class="library-scan-reader"></div>
         </div>
     </div>
     <div id="filterPanel" class="library-filter-panel">
@@ -550,8 +547,7 @@
     </div>
 </div>
 
-<script src="https://unpkg.com/@zxing/library@latest/umd/index.min.js"></script>
-<script src="/static/js/scanner.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/html5-qrcode/minified/html5-qrcode.min.js"></script>
 <script>
     // State
     let libraryItems = [];
@@ -1006,8 +1002,54 @@
     }
 
     async function ensureScannerLibraryLoaded() {
-        // HybridScanner is loaded globally via script tag
-        return typeof HybridScanner !== 'undefined';
+        if (typeof Html5QrcodeScanner !== 'undefined') {
+            return true;
+        }
+
+        const sources = [
+            'https://cdn.jsdelivr.net/npm/html5-qrcode/minified/html5-qrcode.min.js'
+        ];
+
+        for (const src of sources) {
+            try {
+                await new Promise((resolve, reject) => {
+                    const existing = document.querySelector(`script[data-scanner-src="${src}"]`);
+                    if (existing) {
+                        const onLoad = () => resolve();
+                        const onError = () => reject(new Error('Script load failed'));
+                        existing.addEventListener('load', onLoad, { once: true });
+                        existing.addEventListener('error', onError, { once: true });
+                        setTimeout(() => {
+                            existing.removeEventListener('load', onLoad);
+                            existing.removeEventListener('error', onError);
+                            if (typeof Html5QrcodeScanner !== 'undefined') {
+                                resolve();
+                            } else {
+                                reject(new Error('Script not available'));
+                            }
+                        }, 1200);
+                        return;
+                    }
+
+                    const script = document.createElement('script');
+                    script.src = src;
+                    script.async = true;
+                    script.defer = true;
+                    script.dataset.scannerSrc = src;
+                    script.onload = () => resolve();
+                    script.onerror = () => reject(new Error('Script load failed'));
+                    document.head.appendChild(script);
+                });
+
+                if (typeof Html5QrcodeScanner !== 'undefined') {
+                    return true;
+                }
+            } catch (err) {
+                console.warn('Scanner library load failed from', src, err);
+            }
+        }
+
+        return false;
     }
 
     async function startScanner() {
@@ -1024,17 +1066,37 @@
         readerWrap.style.display = 'block';
 
         try {
-            scannerInstance = scannerInstance || new HybridScanner({
-                videoId: 'libraryQrReaderVideo',
-                canvasId: 'libraryQrReaderCanvas',
-                formats: ['QR_CODE', 'EAN_13', 'EAN_8', 'CODE_128', 'CODE_39', 'UPC_A', 'UPC_E', 'ITF', 'CODABAR'],
-                fps: 10,
-                facingMode: 'environment',
-                onSuccess: handleScanSuccess,
-                onError: handleScanError
-            });
+            const formats = [];
+            if (typeof Html5QrcodeSupportedFormats !== 'undefined') {
+                formats.push(
+                    Html5QrcodeSupportedFormats.QR_CODE,
+                    Html5QrcodeSupportedFormats.EAN_13,
+                    Html5QrcodeSupportedFormats.EAN_8,
+                    Html5QrcodeSupportedFormats.CODE_128,
+                    Html5QrcodeSupportedFormats.CODE_39,
+                    Html5QrcodeSupportedFormats.UPC_A,
+                    Html5QrcodeSupportedFormats.UPC_E,
+                    Html5QrcodeSupportedFormats.ITF,
+                    Html5QrcodeSupportedFormats.CODABAR
+                );
+            }
 
-            scannerInstance.start();
+            const scannerConfig = {
+                fps: 10,
+                rememberLastUsedCamera: true,
+                aspectRatio: 1.333334
+            };
+            if (formats.length > 0) {
+                scannerConfig.formatsToSupport = formats;
+            }
+
+            scannerInstance = scannerInstance || new Html5QrcodeScanner(
+                'libraryQrReader',
+                scannerConfig,
+                false
+            );
+
+            scannerInstance.render(handleScanSuccess, handleScanError);
             scannerRunning = true;
             toggleBtn.textContent = 'Scanner stoppen';
             setScanStatus('Scanner aktiv. Jetzt Code scannen.', 'warn');
@@ -1051,7 +1113,7 @@
         const readerWrap = document.getElementById('scanReaderWrap');
         const toggleBtn = document.getElementById('toggleScannerBtn');
         try {
-            scannerInstance.stop();
+            await scannerInstance.clear();
         } catch (err) {
             console.error('Scanner stop failed:', err);
         }

Web/templates/main.html

@@ -413,10 +413,7 @@
         </div>
         <div class="qr-container">
             <button id="scanButton" class="scan-button" aria-controls="qr-reader" aria-expanded="false">Barcode scannen</button>
-            <div id="qr-reader" style="display: none;">
-                <video id="qr-reader-video" playsinline style="width: 100%; max-width: 500px; border-radius: 8px;"></video>
-                <canvas id="qr-reader-canvas" style="display: none;"></canvas>
-            </div>
+            <div id="qr-reader"></div>
         </div>
         <div id="table-view-header" class="table-view-header" aria-hidden="true">
             <span>Name</span>
@@ -529,8 +526,7 @@
     window.isDebug = false; // Set to true only for development environment
 </script>
 
-<script src="https://unpkg.com/@zxing/library@latest/umd/index.min.js"></script>
-<script src="/static/js/scanner.js"></script>
+<script src="https://unpkg.com/html5-qrcode@2.0.9/dist/html5-qrcode.min.js"></script>
 <script>
     // Global state
     const highlightItemId = (window.serverVars && window.serverVars.highlightItemId && window.serverVars.highlightItemId !== 'null')
@@ -543,7 +539,7 @@
     document.addEventListener('DOMContentLoaded', function() {
         const scanButton = document.getElementById('scanButton');
         const qrReader = document.getElementById('qr-reader');
-        let hybridScanner = null;
+        let html5QrcodeScanner = null;
 
         if (!scanButton || !qrReader) return;
 
@@ -557,36 +553,28 @@
             if (qrReader.style.display !== 'block') {
                 qrReader.style.display = 'block';
                 
-                hybridScanner = new HybridScanner({
-                    videoId: 'qr-reader-video',
-                    canvasId: 'qr-reader-canvas',
-                    formats: ['QR_CODE', 'CODE_128', 'EAN_13', 'EAN_8', 'CODE_39'],
-                    fps: 10,
-                    facingMode: 'environment',
-                    onSuccess: function(decodedText) {
-                        hybridScanner.stop();
-                        qrReader.style.display = 'none';
-                        
-                        // Put scanned code into the search box and trigger search
-                        const searchInput = document.getElementById('code-search');
-                        if (searchInput) {
-                            searchInput.value = decodedText;
-                            searchByCode();
-                        }
-
-                        setScannerUi(false);
-                    },
-                    onError: function(error) {
-                        console.error('Scanner error:', error);
+                html5QrcodeScanner = new Html5QrcodeScanner(
+                    'qr-reader', { fps: 10, qrbox: 250 }
+                );
+                
+                html5QrcodeScanner.render((decodedText) => {
+                    html5QrcodeScanner.clear();
+                    qrReader.style.display = 'none';
+                    
+                    // Put scanned code into the search box and trigger search
+                    const searchInput = document.getElementById('code-search');
+                    if (searchInput) {
+                        searchInput.value = decodedText;
+                        searchByCode();
                     }
+
+                    setScannerUi(false);
                 });
 
-                hybridScanner.start();
                 setScannerUi(true);
             } else {
-                if (hybridScanner) {
-                    hybridScanner.stop();
-                    hybridScanner = null;
+                if (html5QrcodeScanner) {
+                    html5QrcodeScanner.clear();
                 }
                 qrReader.style.display = 'none';
                 setScannerUi(false);

Web/templates/main_admin.html

@@ -2732,7 +2732,7 @@ document.addEventListener('DOMContentLoaded', ()=>{
     
     window.isDebug = false; // Set to true only for development environment
 </script>
-<script src="https://unpkg.com/@zxing/library@latest/umd/index.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/@ericblade/quagga2/dist/quagga.js"></script>
 <script src="/static/js/scanner.js"></script>
 <script>
     // Function to check if a file is a video
@@ -2773,57 +2773,97 @@ document.addEventListener('DOMContentLoaded', ()=>{
         return;
     }
     
-    document.getElementById('scanButton').addEventListener('click', function() {
+    // Keep track of the scanner state globally/outer scope
+    let isScanning = false; 
+
+    function startScanner() {
         const qrReader = document.getElementById('qr-reader');
-        const scanBtn = document.getElementById('scanButton');
+        const statusText = document.getElementById('status');
 
-        const setScannerUi = (isOpen) => {
-            if (!scanBtn) return;
-            scanBtn.classList.toggle('is-active', isOpen);
-            scanBtn.setAttribute('aria-expanded', isOpen ? 'true' : 'false');
-            scanBtn.textContent = isOpen ? 'Scanner schliessen' : 'Barcode scannen';
-        };
-        
-        if (qrReader.style.display === 'none') {
-            qrReader.style.display = 'block';
-            
-            hybridScanner = new HybridScanner({
-                videoId: 'qr-reader-video',
-                canvasId: 'qr-reader-canvas',
-                formats: ['QR_CODE', 'CODE_128', 'EAN_13', 'EAN_8', 'CODE_39', 'UPC_A'],
-                fps: 10,
-                facingMode: 'environment',
-                onSuccess: function(decodedText) {
-                    hybridScanner.stop();
-                    qrReader.style.display = 'none';
-                    
-                    // Put the scanned code in the search box
-                    const searchInput = document.getElementById('code-search');
-                    if (searchInput) {
-                        searchInput.value = decodedText;
-                        // Trigger search automatically
-                        searchByCode();
-                    }
+        // Show the container
+        if (qrReader) qrReader.style.display = 'block';
+        if (statusText) statusText.innerText = "Initializing camera...";
 
-                    setScannerUi(false);
+        Quagga.init({
+            inputStream: {
+                name: "Live",
+                type: "LiveStream",
+                // Make sure this targets your correct HTML container element 
+                target: document.querySelector('#scanner-container'), 
+                constraints: {
+                    width: 640,
+                    height: 480,
+                    facingMode: "environment" // Force rear camera
                 },
-                onError: function(error) {
-                    console.error('Scanner error:', error);
-                }
-            });
-
-            hybridScanner.start();
-            setScannerUi(true);
-        } else {
-            if (hybridScanner) {
-                hybridScanner.stop();
-                hybridScanner = null;
+            },
+            decoder: {
+                // Your required formats mapped to Quagga2 reader strings
+                readers: ["code_128_reader", "ean_reader", "code_39_reader", "upc_reader"]
+            }
+        }, function(err) {
+            if (err) {
+                console.error("Initialization error:", err);
+                if (statusText) statusText.innerText = "Camera Error";
+                return;
+            }
+
+            Quagga.start();
+            isScanning = true;
+            setScannerUi(true);
+            if (statusText) statusText.innerText = "Scanning...";
+        });
+    }
+
+    function stopScanner() {
+        Quagga.stop();
+        isScanning = false;
+
+        const qrReader = document.getElementById('qr-reader');
+        if (qrReader) qrReader.style.display = 'none';
+
+        setScannerUi(false);
+    }
+
+    function setScannerUi(isOpen) {
+        const scanBtn = document.getElementById('scanButton');
+        if (!scanBtn) return;
+
+        scanBtn.classList.toggle('is-active', isOpen);
+        scanBtn.setAttribute('aria-expanded', isOpen ? 'true' : 'false');
+        scanBtn.textContent = isOpen ? 'Scanner schliessen' : 'Barcode scannen';
+    }
+
+    // 4. Quagga event listener for successful scans
+    Quagga.onDetected(function(data) {
+        const barcode = data.codeResult.code;
+        console.log("Barcode detected:", barcode);
+
+        // Critical: Stop scanning immediately to prevent multiple triggers
+        stopScanner();
+
+        // Update your results display if you have them
+        const resultText = document.getElementById('barcode-result');
+        if (resultText) resultText.innerText = barcode;
+
+        // Put the scanned code in the search box
+        const searchInput = document.getElementById('code-search');
+        if (searchInput) {
+            searchInput.value = barcode;
+            // Trigger your automatic search
+            if (typeof searchByCode === "function") {
+                searchByCode();
             }
-            qrReader.style.display = 'none';
-            setScannerUi(false);
         }
     });
 
+    // 5. Wire up your Toggle Button click event
+    document.getElementById('scanButton').addEventListener('click', function() {
+        if (!isScanning) {
+            startScanner();
+        } else {
+            stopScanner();
+        }
+    });
     function scanIntoEditCode() {
         const qrReader = document.getElementById('qr-reader');
         const editCodeInput = document.getElementById('edit-code4');

Web/templates/upload_admin.html

@@ -876,10 +876,7 @@
                     <button type="button" id="scan-code4-btn" class="fetch-isbn-button">Barcode scannen</button>
                 </div>
                 <small style="display:block; color:#666;">Einzelcode manuell setzen oder per Scanner erfassen.</small>
-                <div id="code4-scanner" style="width:100%; max-width:520px; display:none; margin-top:10px;">
-                    <video id="code4-scanner-video" playsinline style="width: 100%; border-radius: 8px;"></video>
-                    <canvas id="code4-scanner-canvas" style="display: none;"></canvas>
-                </div>
+                <div id="code4-scanner" style="width:100%; max-width:520px; display:none; margin-top:10px;"></div>
                 <small id="code4-scan-status" style="display:block; color:#666; margin-top:6px;"></small>
             </div>
             <div class="form-group">
@@ -910,10 +907,7 @@
                     <button type="button" id="scan-isbn-btn" class="fetch-isbn-button">Barcode scannen</button>
                     <button type="button" class="fetch-isbn-button" onclick="fetchBookInfo('upload')">Bild abrufen</button>
                 </div>
-                <div id="isbn-scanner" style="width:100%; max-width:520px; display:none; margin-top:10px;">
-                    <video id="isbn-scanner-video" playsinline style="width: 100%; border-radius: 8px;"></video>
-                    <canvas id="isbn-scanner-canvas" style="display: none;"></canvas>
-                </div>
+                <div id="isbn-scanner" style="width:100%; max-width:520px; display:none; margin-top:10px;"></div>
                 <small id="isbn-scan-status" style="display:block; color:#666; margin-top:6px;">Scannen oder manuell eingeben. Gültige ISBNs helfen beim Abruf von Buchdaten, andere Codes werden trotzdem akzeptiert.</small>
                 <div id="book-info-container" class="book-info-container"></div>
             </div>
@@ -977,8 +971,7 @@
     }
 </script>
 
-<script src="https://unpkg.com/@zxing/library@latest/umd/index.min.js"></script>
-<script src="/static/js/scanner.js"></script>
+<script src="https://unpkg.com/html5-qrcode@2.0.9/dist/html5-qrcode.min.js"></script>
 <script>
     const libraryModuleEnabled = {{ 'true' if library_module_enabled else 'false' }};
 
@@ -1057,19 +1050,16 @@
 
         // Stop ISBN scanner if currently running to avoid camera conflicts.
         if (isbnScannerRunning && isbnScannerInstance) {
-            isbnScannerInstance.stop();
-            isbnScannerInstance = null;
+            isbnScannerInstance.clear().catch(() => {});
             const isbnScannerBox = document.getElementById('isbn-scanner');
             const isbnScanButton = document.getElementById('scan-isbn-btn');
             if (isbnScannerBox) isbnScannerBox.style.display = 'none';
             if (isbnScanButton) isbnScanButton.textContent = 'ISBN scannen';
             isbnScannerRunning = false;
-            setIsbnScanStatus('Scanner gestoppt.');
         }
 
         if (code4ScannerRunning && code4ScannerInstance) {
-            code4ScannerInstance.stop();
-            code4ScannerInstance = null;
+            code4ScannerInstance.clear().catch(() => {});
             scannerBox.style.display = 'none';
             scanButton.textContent = 'Barcode scannen';
             code4ScannerRunning = false;
@@ -1079,36 +1069,29 @@
 
         scannerBox.style.display = 'block';
         scanButton.textContent = 'Scanner stoppen';
+        code4ScannerInstance = new Html5QrcodeScanner('code4-scanner', { 
+            fps: 10, 
+            qrbox: 250,
+            rememberLastUsedCamera: true
+        });
         code4ScannerRunning = true;
         setCode4ScanStatus('Scanner läuft. Der Scan wird im Basis-Codefeld übernommen.');
 
-        code4ScannerInstance = new HybridScanner({
-            videoId: 'code4-scanner-video',
-            canvasId: 'code4-scanner-canvas',
-            formats: ['CODE_128', 'CODE_39', 'QR_CODE'],
-            fps: 10,
-            facingMode: 'environment',
-            onSuccess: function(decodedText) {
-                const scannedCode = String(decodedText || '').trim();
-                if (!scannedCode) return;
+        code4ScannerInstance.render((decodedText) => {
+            const scannedCode = String(decodedText || '').trim();
+            if (!scannedCode) return;
 
-                const now = Date.now();
-                if (scannedCode === code4LastScanned && (now - code4LastScannedAt) < 1500) {
-                    return;
-                }
-                code4LastScanned = scannedCode;
-                code4LastScannedAt = now;
-
-                codeField.value = scannedCode;
-                validateCodeField(codeField);
-                setCode4ScanStatus(`Code_4 gesetzt: ${scannedCode}`);
-            },
-            onError: function(error) {
-                setCode4ScanStatus(`Fehler: ${error}`, true);
+            const now = Date.now();
+            if (scannedCode === code4LastScanned && (now - code4LastScannedAt) < 1500) {
+                return;
             }
-        });
+            code4LastScanned = scannedCode;
+            code4LastScannedAt = now;
 
-        code4ScannerInstance.start();
+            codeField.value = scannedCode;
+            validateCodeField(codeField);
+            setCode4ScanStatus(`Code_4 gesetzt: ${scannedCode}`);
+        }, () => {});
     }
 
     function startIsbnScanner() {
@@ -1123,8 +1106,7 @@
 
         // Stop Code_4 scanner if currently running to avoid camera conflicts.
         if (code4ScannerRunning && code4ScannerInstance) {
-            code4ScannerInstance.stop();
-            code4ScannerInstance = null;
+            code4ScannerInstance.clear().catch(() => {});
             const codeScannerBox = document.getElementById('code4-scanner');
             const codeScanButton = document.getElementById('scan-code4-btn');
             if (codeScannerBox) codeScannerBox.style.display = 'none';
@@ -1134,8 +1116,7 @@
         }
 
         if (isbnScannerRunning && isbnScannerInstance) {
-            isbnScannerInstance.stop();
-            isbnScannerInstance = null;
+            isbnScannerInstance.clear().catch(() => {});
             scannerBox.style.display = 'none';
             scanButton.textContent = 'ISBN scannen';
             isbnScannerRunning = false;
@@ -1145,16 +1126,15 @@
 
         scannerBox.style.display = 'block';
         scanButton.textContent = 'Scanner stoppen';
+        isbnScannerInstance = new Html5QrcodeScanner('isbn-scanner', {
+            fps: 10,
+            qrbox: 250,
+            rememberLastUsedCamera: true
+        });
         isbnScannerRunning = true;
         setIsbnScanStatus('Scanner läuft. Bitte ISBN-Code erfassen.');
 
-        isbnScannerInstance = new HybridScanner({
-            videoId: 'isbn-scanner-video',
-            canvasId: 'isbn-scanner-canvas',
-            formats: ['ISBN', 'EAN_13', 'EAN_8', 'QR_CODE'],
-            fps: 10,
-            facingMode: 'environment',
-            onSuccess: function(decodedText) {
+        isbnScannerInstance.render((decodedText) => {
             const scannedCode = String(decodedText || '').trim();
             if (!scannedCode) return;
 
@@ -1167,11 +1147,7 @@
                 setIsbnScanStatus('Kein gültiges ISBN-Format erkannt, der gescannte Wert bleibt aber im Feld.', true);
             }
 
-            // Stop scanner after successful scan
-            if (isbnScannerInstance) {
-                isbnScannerInstance.stop();
-                isbnScannerInstance = null;
-            }
+            isbnScannerInstance.clear().catch(() => {});
             scannerBox.style.display = 'none';
             scanButton.textContent = 'ISBN scannen';
             isbnScannerRunning = false;
@@ -1180,13 +1156,7 @@
                 // Automatically load book metadata after a valid ISBN scan.
                 fetchBookInfo('upload');
             }
-            },
-            onError: function(error) {
-                setIsbnScanStatus(`Fehler: ${error}`, true);
-            }
-        });
-
-        isbnScannerInstance.start();
+        }, () => {});
     }
 
     // Load predefined filter values for dropdowns

tools/debug_get_appointment.py

@@ -1,54 +0,0 @@
-#!/usr/bin/env python3
-"""
-Small debug script to check tenant-aware lookup for an appointment id.
-Usage: ./tools/debug_get_appointment.py <appointment_id> [tenant]
-"""
-import sys
-from bson.objectid import ObjectId
-from Web.modules.database.settings import MongoClient, MONGODB_HOST, MONGODB_PORT, MONGODB_DB
-import Web.modules.database.termine as termine
-
-
-def main():
-    if len(sys.argv) < 2:
-        print("Usage: debug_get_appointment.py <appointment_id> [tenant]")
-        sys.exit(2)
-    aid = sys.argv[1]
-    tenant = sys.argv[2] if len(sys.argv) > 2 else None
-
-    if tenant:
-        print(f"Looking up appointment {aid} for tenant {tenant}")
-    else:
-        print(f"Looking up appointment {aid} for default tenant")
-
-    try:
-        # Use the module helper directly
-        item = termine.get_item(aid)
-        if item:
-            print('Found with termini.get_item:')
-            print(item)
-        else:
-            print('termin.get_item returned None')
-
-        # Try explicit MongoClient + tenant DB resolution
-        client = MongoClient(MONGODB_HOST, MONGODB_PORT)
-        try:
-            from Web.tenant import TenantContext, get_tenant_db
-            if tenant:
-                ctx = TenantContext()
-                ctx.tenant_id = tenant
-                db = ctx.get_database(client)
-            else:
-                db = get_tenant_db(client) if 'get_tenant_db' in dir() else client[MONGODB_DB]
-
-            doc = db['appointments'].find_one({'_id': ObjectId(aid)})
-            print('Direct DB find_one returned:')
-            print(doc)
-        finally:
-            client.close()
-    except Exception as e:
-        print('Error during debug lookup:', e)
-
-
-if __name__ == '__main__':
-    main()