DodoApp: Make form disabling logic work with all forms on the page

Change-Id: Ib82aa2fbd9c607fbc373fc0944fd5729813b128e
diff --git a/core/installer/welcome/dodo-app-tmpl/base.html b/core/installer/welcome/dodo-app-tmpl/base.html
index 450ab25..a4917de 100644
--- a/core/installer/welcome/dodo-app-tmpl/base.html
+++ b/core/installer/welcome/dodo-app-tmpl/base.html
@@ -17,6 +17,7 @@
 	</nav>
     {{- block "content" . }}
     {{- end }}
+	<script src="/stat/dodo-app.js?v=0.0.9"></script>
 </body>
 </html>
 {{ define "resources" }}
diff --git a/core/installer/welcome/dodo-app-tmpl/index.html b/core/installer/welcome/dodo-app-tmpl/index.html
index 67b20f6..5ea0a4b 100644
--- a/core/installer/welcome/dodo-app-tmpl/index.html
+++ b/core/installer/welcome/dodo-app-tmpl/index.html
@@ -31,5 +31,4 @@
 		</ul>
 	</nav>
 </aside>
-<script src="/stat/dodo-app.js?v=0.0.8"></script>
 {{- end -}}
diff --git a/core/installer/welcome/stat/dodo-app.js b/core/installer/welcome/stat/dodo-app.js
index ccb5252..15e3bb2 100644
--- a/core/installer/welcome/stat/dodo-app.js
+++ b/core/installer/welcome/stat/dodo-app.js
@@ -1,20 +1,16 @@
-function triggerForm(status, buttonTxt) {
-    const form = document.getElementById("create-app");
-    const elements = form.querySelectorAll("input, select, textarea, button");
-    const button = document.getElementById("create-app-button");
-    button.textContent = buttonTxt;
-    button.setAttribute("aria-busy", status);
-    elements.forEach(element => {
-        element.disabled = status;
-    });
+function makeFormBusyOnSubmit(form, submitter) {
+  submitter.setAttribute("aria-busy", true);
+  form.querySelectorAll("input, select, textarea, button").forEach((element) => {
+    element.disabled = true;
+  });
 }
 
 document.addEventListener("DOMContentLoaded", () => {
-    const form = document.getElementById("create-app");
+  document.querySelectorAll("form").forEach((form) => {
     form.addEventListener("submit", (event) => {
-        setTimeout(() => {
-            triggerForm(true, "creating app ...");
-        }, 0);
-    });
-    triggerForm(false, "create app");
+	  // TODO(gio): Find better way to disable fields
+	  setTimeout(() => makeFormBusyOnSubmit(event.target, event.submitter), 0);
+	  return true;
+	});
+  });
 });