diff --git a/data_visualization/js/ui.js b/data_visualization/js/ui.js
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+++ b/data_visualization/js/ui.js
@@ -0,0 +1,136 @@
+/* ui.js — Verantwortlich für DOM-Manipulation und UI-Rendering */
+
+/**
+ * Rendert interaktive Diagramme für Umweltdaten.
+ * @param {Array<{timestamp: string, temperature: number, wind_speed: number, humidity: number}>} data - API Response von /data
+ */
+export function renderCharts(data) {
+  const chartContainer = document.querySelector('#data-charts');
+  if (!chartContainer) return;
+  chartContainer.innerHTML = '';
+
+  if (!Array.isArray(data) || data.length === 0) {
+    const msg = document.createElement('p');
+    msg.textContent = 'Keine Daten verfügbar';
+    chartContainer.appendChild(msg);
+    return;
+  }
+
+  // Grundstruktur für Canvas-Diagramme
+  const canvas = document.createElement('canvas');
+  canvas.setAttribute('aria-label', 'Umweltdaten Diagramm');
+  canvas.setAttribute('role', 'img');
+  chartContainer.appendChild(canvas);
+
+  // Beispielhafte Nutzung von Chart.js oder ähnlicher Logik (ohne externe Ressourcen)
+  // Zur Vereinfachung: Darstellung als einfache Linien mit Canvas API
+  const ctx = canvas.getContext('2d');
+  const width = chartContainer.clientWidth;
+  const height = 200;
+  canvas.width = width;
+  canvas.height = height;
+
+  ctx.clearRect(0, 0, width, height);
+
+  const temperatures = data.map(d => d.temperature);
+  const winds = data.map(d => d.wind_speed);
+  const hums = data.map(d => d.humidity);
+
+  const maxTemp = Math.max(...temperatures, 1);
+  const maxWind = Math.max(...winds, 1);
+  const maxHum = Math.max(...hums, 1);
+
+  const step = width / (data.length - 1);
+
+  // Hilfsfunktion zum Zeichnen von Linien
+  const drawLine = (values, color, maxVal) => {
+    ctx.beginPath();
+    ctx.strokeStyle = color;
+    ctx.lineWidth = 2;
+    values.forEach((val, i) => {
+      const x = i * step;
+      const y = height - (val / maxVal) * height;
+      if (i === 0) {
+        ctx.moveTo(x, y);
+      } else {
+        ctx.lineTo(x, y);
+      }
+    });
+    ctx.stroke();
+  };
+
+  drawLine(temperatures, '#e74c3c', maxTemp); // rot für Temp
+  drawLine(winds, '#3498db', maxWind); // blau für Wind
+  drawLine(hums, '#2ecc71', maxHum); // grün für Luftfeuchte
+
+  const legend = document.createElement('div');
+  legend.className = 'chart-legend';
+  legend.innerHTML = `
+    <span style="color:#e74c3c">Temperatur</span> |
+    <span style="color:#3498db">Wind</span> |
+    <span style="color:#2ecc71">Feuchtigkeit</span>
+  `;
+  chartContainer.appendChild(legend);
+}
+
+/**
+ * Rendert eine Galerie aus Bilddaten.
+ * @param {Array<{url: string, capture_time: string, analysis_result: string}>} images - API Response von /images
+ */
+export function renderGallery(images) {
+  const galleryContainer = document.querySelector('#image-gallery');
+  if (!galleryContainer) return;
+  galleryContainer.innerHTML = '';
+
+  if (!Array.isArray(images) || images.length === 0) {
+    const msg = document.createElement('p');
+    msg.textContent = 'Keine Bilddaten verfügbar';
+    galleryContainer.appendChild(msg);
+    return;
+  }
+
+  images.forEach(imgData => {
+    const wrapper = document.createElement('div');
+    wrapper.className = 'gallery-item';
+
+    const figure = document.createElement('figure');
+
+    const thumb = document.createElement('div');
+    thumb.className = 'image-thumb';
+    thumb.tabIndex = 0;
+    thumb.setAttribute('role', 'button');
+    thumb.setAttribute('aria-label', `Bild aufgenommen am ${imgData.capture_time}`);
+
+    // Bilddarstellung über CSS background-image, da keine externen Bilddateien verwendet werden dürfen
+    thumb.style.background = '#ccc'; // Platzhalter, da keine echten Bilder geladen werden dürfen
+
+    const caption = document.createElement('figcaption');
+    caption.textContent = `${imgData.capture_time} – ${imgData.analysis_result}`;
+
+    figure.appendChild(thumb);
+    figure.appendChild(caption);
+    wrapper.appendChild(figure);
+    galleryContainer.appendChild(wrapper);
+
+    // Interaktive Zoomfunktion (nur symbolisch)
+    thumb.addEventListener('click', () => {
+      const expanded = document.createElement('div');
+      expanded.className = 'overlay';
+      expanded.setAttribute('role', 'dialog');
+      expanded.setAttribute('aria-modal', 'true');
+
+      const expandedContent = document.createElement('div');
+      expandedContent.className = 'overlay-content';
+      expandedContent.style.background = '#999'; // Platzhalter für Zoom-Bild
+
+      const closeBtn = document.createElement('button');
+      closeBtn.textContent = 'Schließen';
+      closeBtn.className = 'close-button';
+      closeBtn.addEventListener('click', () => expanded.remove());
+
+      expanded.appendChild(expandedContent);
+      expanded.appendChild(closeBtn);
+      document.body.appendChild(expanded);
+    });
+  });
+}