refactoring

docs/UIUtils.js

@@ -0,0 +1,15 @@
+class UIUtils {
+
+    static instantiateTemplate(templateId) {
+        return document.getElementById(templateId).content.firstElementChild.cloneNode(true);
+    }
+
+    static createChartViewElementWithHeading(heading) {
+        const chartViewElement = UIUtils.instantiateTemplate('template-ChartView');
+        chartViewElement.querySelector(".heading").textContent = heading;
+        return {
+            chartViewElement: chartViewElement,
+            canvas: chartViewElement.querySelector(".canvas")
+        };
+    }    
+}