From c45febccd4f1e9f10417bfbc0ce780eeecf13e27 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BA=8C=E8=B4=A7=E6=9C=BA=E5=99=A8=E4=BA=BA?=
 <smith3816@gmail.com>
Date: Wed, 17 Dec 2025 16:52:44 +0800
Subject: [PATCH] fix: defaultOpen not working

---
 src/BaseSelect/index.tsx |  7 +++++--
 src/hooks/useOpen.ts     |  3 ++-
 tests/Select.test.tsx    | 10 ++++++++++
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/BaseSelect/index.tsx b/src/BaseSelect/index.tsx
index b80e4fe0..cb2ac94a 100644
--- a/src/BaseSelect/index.tsx
+++ b/src/BaseSelect/index.tsx
@@ -358,8 +358,11 @@ const BaseSelect = React.forwardRef<BaseSelectRef, BaseSelectProps>((props, ref)
   // Not trigger `open` when `notFoundContent` is empty
   const emptyListContent = !notFoundContent && emptyOptions;
 
-  const [mergedOpen, triggerOpen] = useOpen(open, onPopupVisibleChange, (nextOpen) =>
-    disabled || emptyListContent ? false : nextOpen,
+  const [mergedOpen, triggerOpen] = useOpen(
+    defaultOpen || false,
+    open,
+    onPopupVisibleChange,
+    (nextOpen) => (disabled || emptyListContent ? false : nextOpen),
   );
 
   // ============================= Search =============================
diff --git a/src/hooks/useOpen.ts b/src/hooks/useOpen.ts
index 53c6d92c..8d248054 100644
--- a/src/hooks/useOpen.ts
+++ b/src/hooks/useOpen.ts
@@ -39,6 +39,7 @@ export type TriggerOpenType = (
  * On client-side hydration, it syncs with the actual open state.
  */
 export default function useOpen(
+  defaultOpen: boolean,
   propOpen: boolean,
   onOpen: (nextOpen: boolean) => void,
   postOpen: (nextOpen: boolean) => boolean,
@@ -50,7 +51,7 @@ export default function useOpen(
     setRendered(true);
   }, []);
 
-  const [stateOpen, internalSetOpen] = useControlledState(false, propOpen);
+  const [stateOpen, internalSetOpen] = useControlledState(defaultOpen, propOpen);
 
   // During SSR, always return false for open state
   const ssrSafeOpen = rendered ? stateOpen : false;
diff --git a/tests/Select.test.tsx b/tests/Select.test.tsx
index 27531303..ce920b2b 100644
--- a/tests/Select.test.tsx
+++ b/tests/Select.test.tsx
@@ -66,6 +66,16 @@ describe('Select.Basic', () => {
     expect(onPopupVisibleChange).toHaveBeenCalledWith(false);
   });
 
+  it('should defaultOpen work', () => {
+    const { container } = render(
+      <Select defaultOpen>
+        <Option value="1">One</Option>
+        <Option value="2">Two</Option>
+      </Select>,
+    );
+    expectOpen(container);
+  });
+
   describe('render', () => {
     function genSelect(props?: Partial<SelectProps>) {
       return (