1 files changed, 20 insertions, 0 deletions
diff --git a/code/frontpage/assets/js/alert.js b/code/frontpage/assets/js/alert.js
new file mode 100644
index 0000000..1956103
--- /dev/null
+++ b/code/frontpage/assets/js/alert.js
@@ -0,0 +1,20 @@
+var announcement = document.getElementById('announcement');
+
+if (announcement !== null) {
+
+  var id = announcement.dataset.id;
+
+  Object.keys(localStorage).forEach(function(key) {
+    if (/^global-alert-/.test(key)) {
+      if (key !== id ) {
+        localStorage.removeItem(key);
+        document.documentElement.removeAttribute('data-global-alert');
+      }
+    }
+  });
+
+  announcement.addEventListener('closed.bs.alert', () => {
+    localStorage.setItem(id, 'closed');
+  });
+
+}
+\ No newline at end of file