Gehe zu button, Verwaltung Urlaubsberechnung

public/js/dashboard.js

@@ -171,6 +171,56 @@ document.addEventListener('DOMContentLoaded', async function() {
     saveLastWeek();
     loadWeek();
   });
+
+  function showGoToWeekError(msg) {
+    const el = document.getElementById('goToWeekError');
+    if (el) { el.textContent = msg; el.style.display = 'inline'; }
+  }
+  function clearGoToWeekError() {
+    const el = document.getElementById('goToWeekError');
+    if (el) { el.textContent = ''; el.style.display = 'none'; }
+  }
+  function goToWeek() {
+    clearGoToWeekError();
+    const input = document.getElementById('goToWeekInput');
+    if (!input) return;
+    const raw = (input.value || '').trim();
+    if (!raw) {
+      showGoToWeekError('Bitte KW eingeben (z. B. 12 oder 2025 12).');
+      return;
+    }
+    let year = null;
+    let week = null;
+    const parts = raw.split(/[\s\/]+/).filter(Boolean).map(p => parseInt(p, 10));
+    if (parts.length === 1 && !isNaN(parts[0])) {
+      week = parts[0];
+      year = currentWeekStart ? parseInt(currentWeekStart.split('-')[0], 10) : new Date().getFullYear();
+    } else if (parts.length === 2 && !isNaN(parts[0]) && !isNaN(parts[1])) {
+      if (parts[0] >= 1000) {
+        year = parts[0];
+        week = parts[1];
+      } else {
+        week = parts[0];
+        year = parts[1];
+      }
+    }
+    if (year == null || week == null || week < 1 || week > 53 || year < 2000 || year > 2100) {
+      showGoToWeekError('Ungültige Eingabe. KW 1–53, Jahr 2000–2100 (z. B. 12 oder 2025 12).');
+      return;
+    }
+    currentWeekStart = getWeekStartFromYearAndWeek(year, week);
+    saveLastWeek();
+    loadWeek();
+  }
+
+  const goToWeekBtn = document.getElementById('goToWeekBtn');
+  if (goToWeekBtn) goToWeekBtn.addEventListener('click', goToWeek);
+  const goToWeekInput = document.getElementById('goToWeekInput');
+  if (goToWeekInput) {
+    goToWeekInput.addEventListener('keydown', function(e) {
+      if (e.key === 'Enter') { e.preventDefault(); goToWeek(); }
+    });
+  }
   
   // Event-Listener für Submit-Button - mit Event-Delegation für bessere Zuverlässigkeit
   document.addEventListener('click', function(e) {
@@ -285,6 +335,20 @@ function getCalendarWeek(dateStr) {
   return weekNo;
 }
 
+// Montag (week_start) aus Jahr und Kalenderwoche (ISO 8601)
+function getWeekStartFromYearAndWeek(year, weekNumber) {
+  const jan4 = new Date(Date.UTC(year, 0, 4));
+  const jan4Day = jan4.getUTCDay() || 7;
+  const daysToMonday = jan4Day === 1 ? 0 : 1 - jan4Day;
+  const firstMonday = new Date(Date.UTC(year, 0, 4 + daysToMonday));
+  const weekMonday = new Date(firstMonday);
+  weekMonday.setUTCDate(firstMonday.getUTCDate() + (weekNumber - 1) * 7);
+  const y = weekMonday.getUTCFullYear();
+  const m = String(weekMonday.getUTCMonth() + 1).padStart(2, '0');
+  const d = String(weekMonday.getUTCDate()).padStart(2, '0');
+  return `${y}-${m}-${d}`;
+}
+
 // Datum formatieren (YYYY-MM-DD)
 function formatDate(date) {
   const d = new Date(date);