From 80fad65e5b95c8b78fdd365c03d975eb5f6c3d4e Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Tue, 28 Feb 2023 18:39:11 +0000
Subject: [PATCH] LibWeb: Add function to EventTarget that says if it has any
 listeners

Required by XHR to determine if it should use CORS-preflight if its
upload object has any event listeners.
---
 Userland/Libraries/LibWeb/DOM/EventTarget.cpp | 5 +++++
 Userland/Libraries/LibWeb/DOM/EventTarget.h   | 1 +
 2 files changed, 6 insertions(+)

diff --git a/Userland/Libraries/LibWeb/DOM/EventTarget.cpp b/Userland/Libraries/LibWeb/DOM/EventTarget.cpp
index cbbb2644de..a581a4cc9c 100644
--- a/Userland/Libraries/LibWeb/DOM/EventTarget.cpp
+++ b/Userland/Libraries/LibWeb/DOM/EventTarget.cpp
@@ -744,4 +744,9 @@ bool EventTarget::has_event_listener(DeprecatedFlyString const& type) const
     return false;
 }
 
+bool EventTarget::has_event_listeners() const
+{
+    return !m_event_listener_list.is_empty();
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/EventTarget.h b/Userland/Libraries/LibWeb/DOM/EventTarget.h
index 240d9ad387..5077c92ef7 100644
--- a/Userland/Libraries/LibWeb/DOM/EventTarget.h
+++ b/Userland/Libraries/LibWeb/DOM/EventTarget.h
@@ -55,6 +55,7 @@ public:
     void set_event_handler_attribute(DeprecatedFlyString const& name, WebIDL::CallbackType*);
 
     bool has_event_listener(DeprecatedFlyString const& type) const;
+    bool has_event_listeners() const;
 
 protected:
     explicit EventTarget(JS::Realm&);