refactoring

docs/HistogramView.js

@@ -0,0 +1,25 @@
+class HistogramView {
+
+    constructor() {
+    }
+
+    show(batchcode, div) {
+        fetch(`data/histograms/${batchcode}.json`)
+            .then(response => response.json())
+            .then(json => {
+                const data = json.histograms[3].histogram;
+                new Chart(
+                    div.querySelector('#symptomByBatchcodeHisto'),
+                    {
+                        type: 'bar',
+                        data: {
+                            datasets: [{
+                                label: 'Acquisitions by year',
+                                data: data
+                            }]
+                        }
+                    }
+                );
+            });
+    }
+}