From 51a042551ddd1fa4346d972ee8eec67da3348b32 Mon Sep 17 00:00:00 2001
From: Marco 'Lubber' Wienkoop <c64@lubber.de>
Date: Mon, 20 Dec 2021 08:50:49 +0100
Subject: [PATCH] fix(api): empty dropdown data was overriden by previous data

Revert and proper fix of #2175
I forgot to check for an empty dropdown value. Jquery unfortunately does not return the field at all on serializeArray when multiple named fields (which should return an array) are empty.
---
 src/definitions/behaviors/api.js | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/definitions/behaviors/api.js b/src/definitions/behaviors/api.js
index 3b2c1fccb3..71af919b28 100644
--- a/src/definitions/behaviors/api.js
+++ b/src/definitions/behaviors/api.js
@@ -74,6 +74,7 @@ $.api = $.fn.api = function(parameters) {
         url,
         data,
         requestStartTime,
+        originalData,
 
         // standard module
         element         = this,
@@ -86,6 +87,7 @@ $.api = $.fn.api = function(parameters) {
 
         initialize: function() {
           if(!methodInvoked) {
+            originalData = settings.data;
             module.bind.events();
           }
           module.instantiate();
@@ -197,7 +199,7 @@ $.api = $.fn.api = function(parameters) {
 
           // Add form content
           if(settings.serializeForm) {
-            settings.data = module.add.formData(settings.data);
+            settings.data = module.add.formData(originalData || settings.data);
           }
 
           // call beforesend and get any settings changes
@@ -428,7 +430,7 @@ $.api = $.fn.api = function(parameters) {
               formData = {},
               hasOtherData
             ;
-            data         = data || settings.data;
+            data         = data || originalData || settings.data;
             hasOtherData = $.isPlainObject(data);
 
             $.each($form.serializeArray(), function (i, element) {
@@ -443,9 +445,6 @@ $.api = $.fn.api = function(parameters) {
               } else {
                 formData[element.name] = element.value;
               }
-              if(hasOtherData && data[element.name]) {
-                delete data[element.name];
-              }
             });
 
             if(hasOtherData) {