starting to make prrByVaccineTable downloadable

docs/SymptomsCausedByVaccines/js/PrrByVaccineTableView.js

@@ -1,15 +1,34 @@
 class PrrByVaccineTableView {
 
     #prrByVaccineTable;
+    #prrByVaccine;
+    #symptom;
 
-    constructor(prrByVaccineTableElement) {
+    constructor(prrByVaccineTableElement, downloadPrrByVaccineTableButton) {
         this.#prrByVaccineTable = new PrrByVaccineTable(prrByVaccineTableElement);
         this.#prrByVaccineTable.initialize();
+        downloadPrrByVaccineTableButton.addEventListener(
+            'click',
+            () => this.#downloadPrrByVaccine())
     }
 
     displayPrrByVaccineTable4Symptom(symptom) {
         PrrByVaccineProvider
             .getPrrByVaccine(symptom)
-            .then(prrByVaccine => this.#prrByVaccineTable.display(prrByVaccine));
+            .then(prrByVaccine => {
+                this.#prrByVaccine = prrByVaccine;
+                this.#symptom = symptom;
+                this.#prrByVaccineTable.display(prrByVaccine);
+            });
+    }
+
+    #downloadPrrByVaccine() {
+        UIUtils.downloadUrlAsFilename(
+            window.URL.createObjectURL(
+                new Blob(
+                    [Utils.convertDict2CSV(this.#prrByVaccine)],
+                    { type: 'text/csv' })),
+            this.#symptom
+        );
     }
 }