diff --git a/app/javascript/retrospring/utilities/on.ts b/app/javascript/retrospring/utilities/on.ts
new file mode 100644
index 00000000..1d7d5211
--- /dev/null
+++ b/app/javascript/retrospring/utilities/on.ts
@@ -0,0 +1,7 @@
+export function on(type: string, selector: string, callback: Function): void {
+  document.addEventListener(type, (event: Event) => {
+    if ((event.target as HTMLElement).matches(selector)) {
+      callback(event);
+    }
+  });
+};
\ No newline at end of file