starting Safety Signal (All drugs)

docs/SymptomsCausedByDrugs/js/PrrByKeyTableView.js

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+class PrrByKeyTableView {
+
+    #prrByKeyTable;
+    #downloadPrrByKeyTableButton;
+    #value;
+    #valueName;
+    #prrByKeyProvider;
+
+    constructor(prrByKeyTable, downloadPrrByKeyTableButton, valueName, prrByKeyProvider) {
+        this.#prrByKeyTable = prrByKeyTable;
+        this.#prrByKeyTable.initialize();
+        this.#initializeButton(downloadPrrByKeyTableButton);
+        this.#valueName = valueName;
+        this.#prrByKeyProvider = prrByKeyProvider;
+    }
+
+    displayPrrByKeyTable4Value(value) {
+        UIUtils.disableButton(this.#downloadPrrByKeyTableButton);
+        this.#prrByKeyProvider(value)
+            .then(prrByKey => {
+                this.#value = value;
+                this.#prrByKeyTable.display(prrByKey);
+                UIUtils.enableButton(this.#downloadPrrByKeyTableButton);
+            });
+    }
+
+    #initializeButton(downloadPrrByKeyTableButton) {
+        this.#downloadPrrByKeyTableButton = downloadPrrByKeyTableButton;
+        UIUtils.disableButton(downloadPrrByKeyTableButton);
+        downloadPrrByKeyTableButton.addEventListener(
+            'click',
+            () => this.#downloadPrrByKey())
+    }
+
+    #downloadPrrByKey() {
+        UIUtils.downloadUrlAsFilename(
+            window.URL.createObjectURL(
+                new Blob(
+                    [this.#prrByKeyTable.getDisplayedTableAsCsv(`# ${this.#valueName}: ${this.#value}`)],
+                    { type: 'text/csv' })),
+            this.#value
+        );
+    }
+}