Oof, why I have to do this that way

js/pgupgrade.js

@@ -78,8 +78,9 @@ function doInstallScroller () {
     return false;
 }
 
-window.doUpgrade = function (form) {
+window.doUpgrade = function () {
     'use strict';
+    let form = new FormData(upgradeForm);
     window.selectedVersion = form.get('selectedVersion');
     document.getElementById('upgradeTitle').textContent = "Install Progress for PostgreSQL " + window.selectedVersion;
     let submitBtn = document.getElementById('submit');

templates/ui/pgupgrade.tmpl

@@ -70,6 +70,6 @@ This interface at least attempts to take care of those issues for you.
         </table>
     </form>
 </div>
-<button id="submit" class="btn btn-success" title="Please select a version above to continue" onclick="window.doUpgrade(new FormData(upgradeForm));">Continue</button>
+<button id="submit" class="btn btn-success" title="Please select a version above to continue" onclick="window.doUpgrade();">Continue</button>
 <script type="text/javascript" src="js/pgupgrade.js"></script>
 [% END %]