From 017c4be9e8ea2a81b38c0ae7e4da8c58401d8ec8 Mon Sep 17 00:00:00 2001
From: johnsonwong666 <1067100250@qq.com>
Date: Wed, 12 Apr 2023 14:09:49 +0800
Subject: [PATCH] fix(Sticky): fix sticky wrap empty

---
 packages/sticky/index.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/packages/sticky/index.ts b/packages/sticky/index.ts
index b433e281f..0b0906352 100644
--- a/packages/sticky/index.ts
+++ b/packages/sticky/index.ts
@@ -49,6 +49,7 @@ VantComponent({
 
   mounted() {
     this.onScroll();
+    this.observeWrap();
   },
 
   methods: {
@@ -130,5 +131,16 @@ VantComponent({
         (resolve) => nodesRef.boundingClientRect(resolve).exec()
       );
     },
+
+    observeWrap() {
+      // 如果子元素没有内容了 高度为0 取消掉fixed
+      const observer = wx.createIntersectionObserver(this);
+      observer.relativeToViewport();
+      observer.observe(`.van-sticky-wrap`, (res) => {
+        if (!res.boundingClientRect.height) {
+          this.setDataAfterDiff({ fixed: false, height: 0 });
+        }
+      });
+    },
   },
 });