Add dropdown prevalue editor

src/Umbraco.Web.UI.Client/src/views/prevalueeditors/dropdown.controller.js

@@ -0,0 +1,53 @@
+angular.module("umbraco").controller("Umbraco.PrevalueEditors.DropDownListController",
+    function ($scope) {
+        
+        const vm = this;
+        
+        vm.configItems = [];
+        vm.viewItems = [];
+
+        function init() {
+
+            const prevalues = ($scope.model.config ? $scope.model.config.prevalues : $scope.model.prevalues) || [];
+
+            let items = [];
+
+            for (let i = 0; i < prevalues.length; i++) {
+                const item = {};
+
+                if (Utilities.isObject(prevalues[i])) {
+                    item.value = prevalues[i].value;
+                    item.label = prevalues[i].label || prevalues[i].value;
+                }
+                else {
+                    item.value = prevalues[i];
+                    item.label = prevalues[i];
+                }
+
+                items.push({ value: item.value, label: item.label });
+            }
+
+            vm.configItems = items;
+
+            // update view model.
+            generateViewModel();
+        }
+
+        function generateViewModel() {
+
+            vm.viewItems = [];
+
+            let iConfigItem;
+            for (let i = 0; i < vm.configItems.length; i++) {
+                iConfigItem = vm.configItems[i];
+                vm.viewItems.push({
+                    value: iConfigItem.value,
+                    label: iConfigItem.label
+                });
+            }
+
+        }
+
+        init();
+
+    });

src/Umbraco.Web.UI.Client/src/views/prevalueeditors/dropdown.html

@@ -0,0 +1,11 @@
+<div class="umb-checkboxlist-preval" ng-controller="Umbraco.PrevalueEditors.DropDownListController as vm">
+
+    <select name="dropDownList"
+            class="umb-dropdown"
+            ng-if="vm.viewItems.length"
+            ng-model="model.value"
+            ng-options="item.value as item.label for item in vm.viewItems">
+        <option></option>
+    </select>
+
+</div>