1 files changed, 31 insertions, 0 deletions
diff --git a/src/webex/pages/common.ts b/src/webex/pages/common.ts
new file mode 100644
index 000000000..695e5fc1d
--- /dev/null
+++ b/src/webex/pages/common.ts
@@ -0,0 +1,31 @@
+/*
+ This file is part of TALER
+ (C) 2018 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Common helper functions for all web extension pages.
+ */
+
+/**
+ * Make sure that a function is executed exactly once
+ * after the DOM has been loaded.
+ */
+export function runOnceWhenReady(f: () => void): void {
+  if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", f);
+    return;
+  }
+  f();
+}