[ADD] web_widget_dropdown_dynamic

[UPD] Update web_widget_dropdown_dynamic.pot

[UPD] Update web_widget_dropdown_dynamic_example.pot

[UPD] README.rst

[ADD] icon.png

[UPD] README.rst

web_widget_dropdown_dynamic/static/src/js/basic_model.js

@@ -0,0 +1,47 @@
+/* 
+ * Copyright 2019 Brainbean Apps (https://brainbeanapps.com)
+ * License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+ */
+odoo.define('web_widget_dropdown_dynamic.basic_model', function (require) {
+    "use strict";
+
+    var BasicModel = require('web.BasicModel');
+
+    BasicModel.include({
+        /**
+         * Fetches all the values associated to the given fieldName.
+         *
+         * @param {Object} record - an element from the localData
+         * @param {Object} fieldName - the name of the field
+         * @param {Object} fieldInfo
+         * @returns {Promise<any>}
+         *          The promise is resolved with the fetched special values.
+         *          If this data is the same as the previously fetched one
+         *          (for the given parameters), no RPC is done and the promise
+         *          is resolved with the undefined value.
+         */
+        _fetchDynamicDropdownValues: function (record, fieldName, fieldInfo) {
+            var model = fieldInfo.options.model || record.model;
+            var method = fieldInfo.values || fieldInfo.options.values;
+            if (!method) {
+                return $.when();
+            }
+
+            var context = record.getContext({fieldName: fieldName});
+
+            // avoid rpc if not necessary
+            var hasChanged = this._saveSpecialDataCache(record, fieldName, {
+                context: context,
+            });
+            if (!hasChanged) {
+                return $.when();
+            }
+
+            return this._rpc({
+                model: model,
+                method: method,
+                context: context,
+            });
+        },
+    });
+});