From 8d752c74b99bbe04e69f698611705d84796319ea Mon Sep 17 00:00:00 2001
From: Travis <godxiaoji@163.com>
Date: Wed, 8 Mar 2023 15:13:15 +0800
Subject: [PATCH] fix(components): [select] Filter duplicate emits of "update
 options" (#11884)

* fix(components): [select] Filter duplicate emits of "update options"

* perf(components): [select] Code standardization
---
 packages/components/select/src/options.ts | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/components/select/src/options.ts b/packages/components/select/src/options.ts
index 8cbda10c38..047204f7af 100644
--- a/packages/components/select/src/options.ts
+++ b/packages/components/select/src/options.ts
@@ -6,6 +6,18 @@ export default defineComponent({
   name: 'ElOptions',
   emits: ['update-options'],
   setup(_, { slots, emit }) {
+    let cachedOptions: any[] = []
+
+    function isSameOptions(a: any[], b: any[]) {
+      if (a.length !== b.length) return false
+      for (const [index] of a.entries()) {
+        if (a[index] != b[index]) {
+          return false
+        }
+      }
+      return true
+    }
+
     return () => {
       const children = slots.default?.()!
 
@@ -19,7 +31,10 @@ export default defineComponent({
             )
             .map((item: VNode) => item.props?.label)
 
-          emit('update-options', filteredOptions)
+          if (!isSameOptions(filteredOptions, cachedOptions)) {
+            cachedOptions = filteredOptions
+            emit('update-options', filteredOptions)
+          }
         }
       }