changes to the physical scanner processing

Web/templates/library_table.html

@@ -843,6 +843,8 @@
     let keyboardScanBuffer = '';
     let keyboardLastKeyAt = 0;
     const KEYBOARD_SCAN_INTERCHAR_MS = 100; // max time between keystrokes to consider them one scan
+    const physicalScanQueue = [];
+    let keyboardScanProcessing = false;
     let editLibraryState = {
         itemId: '',
         seriesGroupId: '',
@@ -1188,38 +1190,49 @@
         // Only active when explicitly enabled
         if (!keyboardScannerEnabled) return;
 
-        // Ignore if focus is in an input/textarea/contenteditable to avoid interfering with typing
-        const active = document.activeElement;
-        if (active && (active.tagName === 'INPUT' || active.tagName === 'TEXTAREA' || active.isContentEditable)) return;
-
         const now = Date.now();
 
         // If Enter/Return pressed -> finalize buffer
         if (e.key === 'Enter') {
+            e.preventDefault();
             const code = keyboardScanBuffer.trim();
             keyboardScanBuffer = '';
             keyboardLastKeyAt = 0;
             if (!code) return;
 
-            // Process exactly like a camera scan - centralized logic handles the rest!
-            handleScanSuccess(code);
+            // Scanner keystrokes must not be submitted into the focused form field.
+            processPhysicalScan(code);
             return;
         }
 
-        // Only accept common printable characters; ignore modifier keys
-        if (e.key.length === 1) {
+        // Physical scanners in this workflow emit numeric codes only.
+        if (e.key.length === 1 && /\d/.test(e.key)) {
             // If time gap too big, start new buffer
             if (keyboardLastKeyAt && (now - keyboardLastKeyAt) > KEYBOARD_SCAN_INTERCHAR_MS) {
                 keyboardScanBuffer = '';
             }
             keyboardScanBuffer += e.key;
             keyboardLastKeyAt = now;
-            // Prevent default so scanner input doesn't accidentally move focus or trigger shortcuts
+            // Prevent default so scanner input is captured even while an input has focus.
             e.preventDefault();
         }
     }
 
-    function handleScanSuccess(decodedText) {
+    async function processPhysicalScan(code) {
+        physicalScanQueue.push(code);
+        if (keyboardScanProcessing) return;
+
+        keyboardScanProcessing = true;
+        try {
+            while (physicalScanQueue.length > 0) {
+                await handleScanSuccess(physicalScanQueue.shift());
+            }
+        } finally {
+            keyboardScanProcessing = false;
+        }
+    }
+
+    async function handleScanSuccess(decodedText) {
         const scannedCode = typeof normalizeScannedCode === "function" ? normalizeScannedCode(decodedText) : decodedText;
         if (!scannedCode) return;
 
@@ -1235,26 +1248,27 @@
 
         // 1. Modus: Nur Rückgabe
         if (mode === 'return_only') {
-            returnByCode(scannedCode);
+            await returnByCode(scannedCode);
             return;
         }
 
         // 2. Modus: Nur Ausweis
         if (mode === 'card_only') {
             setActiveStudentCard(scannedCode);
-            setScanStatus(`Ausweis gesetzt: ${activeStudentCardId}`, 'ok');
+            setScanStatus(`Ausweis gesetzt: ${activeStudentCardId}. Bitte den nächsten Ausweis scannen.`, 'ok');
+            showSmallConfirm(`Ausweis erkannt: ${activeStudentCardId}. Sie können den nächsten scannen.`, 'ok');
             return;
         }
 
         // 3. Modus: Schnellmodus (1x Ausweis, 1x Buch)
         if (mode === 'quick_toggle') {
-            processQuickToggleScan(scannedCode);
+            await processQuickToggleScan(scannedCode);
             return;
         }
 
         // 4. Modus: Dauermodus (1x Ausweis, Nx Bücher)
         if (mode === 'continuous') {
-            processContinuousScan(scannedCode);
+            await processContinuousScan(scannedCode);
             return;
         }
     }
@@ -1341,7 +1355,8 @@
         // 2. Wenn kein Ausweis gesetzt ist, wird der Code als Ausweis interpretiert
         if (!activeStudentCardId) {
             setActiveStudentCard(scannedCode);
-            setScanStatus(`Ausweis gesetzt: ${activeStudentCardId}`, 'ok');
+            setScanStatus(`Ausweis gesetzt: ${activeStudentCardId}. Bitte den nächsten Mediencode scannen.`, 'ok');
+            showSmallConfirm(`Ausweis erkannt: ${activeStudentCardId}. Bitte jetzt den nächsten Mediencode scannen.`, 'ok');
             return;
         }