From b38d7fd443a4931f4dcc57e0c351b926f17b2212 Mon Sep 17 00:00:00 2001
From: morning-star <26325820+Sight-wcg@users.noreply.github.com>
Date: Fri, 14 Feb 2025 16:38:01 +0800
Subject: [PATCH] =?UTF-8?q?fix(form):=20=E4=BF=AE=E5=A4=8D=20select=20?=
 =?UTF-8?q?=E6=9C=AA=E9=80=89=E4=B8=AD=E6=97=B6=20form.val=20=E8=8E=B7?=
 =?UTF-8?q?=E5=8F=96=E5=88=B0=E7=9A=84=E5=80=BC=E4=B8=BA=20null=20?=
 =?UTF-8?q?=E7=9A=84=E9=97=AE=E9=A2=98=20(#2475)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/modules/form.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/modules/form.js b/src/modules/form.js
index a61f3ff7..4d18289b 100644
--- a/src/modules/form.js
+++ b/src/modules/form.js
@@ -158,7 +158,12 @@ layui.define(['lay', 'layer', 'util'], function(exports){
       }
       
       if(/^(checkbox|radio)$/.test(item.type) && !item.checked) return;  // 复选框和单选框未选中，不记录字段     
-      field[init_name || item.name] = othis.val();
+      // select 多选用 jQuery 方式取值，未选中 option 时，
+      // jQuery v2.2.4 及以下版本返回 null，以上(3.x) 返回 []。
+      // 统一规范化为 []，参考 https://github.com/jquery/jquery/issues/2562
+      field[init_name || item.name] = (this.tagName === 'SELECT' && typeof this.getAttribute('multiple') === 'string') 
+        ? othis.val() || []
+        : this.value;
     });
     
     return field;