From 2d1362dd4112c49ccb18f5b615136ad39cb2373b Mon Sep 17 00:00:00 2001
From: rvsia <r.vsia@seznam.cz>
Date: Mon, 11 Jul 2022 15:53:10 +0200
Subject: [PATCH] Add Cascading Select example

---
 .../schemas/custom-examples.schema.js         |  4 +
 .../components/examples/cascading-select.js   | 85 +++++++++++++++++++
 .../src/pages/examples/cascading-select.md    | 18 ++++
 3 files changed, 107 insertions(+)
 create mode 100644 packages/react-renderer-demo/src/examples/components/examples/cascading-select.js
 create mode 100644 packages/react-renderer-demo/src/pages/examples/cascading-select.md

diff --git a/packages/react-renderer-demo/src/components/navigation/schemas/custom-examples.schema.js b/packages/react-renderer-demo/src/components/navigation/schemas/custom-examples.schema.js
index f9cec059e..8d24e5ec9 100644
--- a/packages/react-renderer-demo/src/components/navigation/schemas/custom-examples.schema.js
+++ b/packages/react-renderer-demo/src/components/navigation/schemas/custom-examples.schema.js
@@ -31,6 +31,10 @@ const customExamplesSchema = [
     component: 'value-listener',
     linkText: 'Value listener',
   },
+  {
+    component: 'cascading-select',
+    linkText: 'Cascading select',
+  },
 ];
 
 export default customExamplesSchema;
diff --git a/packages/react-renderer-demo/src/examples/components/examples/cascading-select.js b/packages/react-renderer-demo/src/examples/components/examples/cascading-select.js
new file mode 100644
index 000000000..a0d34f565
--- /dev/null
+++ b/packages/react-renderer-demo/src/examples/components/examples/cascading-select.js
@@ -0,0 +1,85 @@
+import React from 'react';
+import FormRenderer from '@data-driven-forms/react-form-renderer/form-renderer';
+import componentTypes from '@data-driven-forms/react-form-renderer/component-types';
+import FormSpy from '@data-driven-forms/react-form-renderer/form-spy';
+import FormTemplate from '@data-driven-forms/mui-component-mapper/form-template';
+import Select from '@data-driven-forms/mui-component-mapper/select';
+
+const mockApi = (type) => {
+  console.log(type);
+  switch (type) {
+    case 'vegetable':
+      return Promise.resolve([
+        { label: 'Carrot', value: 'carrot' },
+        { label: 'Potato', value: 'potato' },
+      ]);
+    case 'fruit':
+      return Promise.resolve([
+        { label: 'Apple', value: 'apple' },
+        { label: 'Orange', value: 'orange' },
+      ]);
+    case 'pasta':
+      return Promise.resolve([
+        { label: 'Manicotti', value: 'manicotti' },
+        { label: 'Rotini', value: 'rotini' },
+        { label: 'Tortellini', value: 'tortellini' },
+        { label: 'Bucatini', value: 'bucatini' },
+      ]);
+    default:
+      return Promise.resolve([]);
+  }
+};
+
+const counterMapper = (type) => {
+  switch (type) {
+    case 'vegetable':
+      return 3;
+    case 'fruit':
+      return 2;
+    case 'pasta':
+      return 1;
+    default:
+      return 0;
+  }
+};
+
+const schema = {
+  fields: [
+    {
+      component: 'select',
+      name: 'favorite',
+      label: 'Select your favorite category of food',
+      options: [
+        { label: 'Vegetable', value: 'vegetable' },
+        { label: 'Fruit', value: 'fruit' },
+        { label: 'Pasta', value: 'pasta' },
+      ],
+    },
+    {
+      component: 'enhanced-select',
+      name: 'food',
+      label: 'Select your favorite food of the selected category',
+      onInputChange: () => null,
+      noOptionsMessage: 'Select category first',
+      resolveProps: (_props, _field, { getState }) => {
+        const favoriteValue = getState().values.favorite;
+
+        return {
+          loadOptionsChangeCounter: counterMapper(favoriteValue),
+          loadOptions: () => mockApi(favoriteValue),
+        };
+      },
+    },
+  ],
+};
+
+const EnhancedSelect = (props) => <FormSpy subscription={{ values: true }}>{() => <Select {...props} />}</FormSpy>;
+
+const componentMapper = {
+  [componentTypes.SELECT]: Select,
+  'enhanced-select': EnhancedSelect,
+};
+
+const CascadingSelect = () => <FormRenderer FormTemplate={FormTemplate} componentMapper={componentMapper} schema={schema} onSubmit={console.log} />;
+
+export default CascadingSelect;
diff --git a/packages/react-renderer-demo/src/pages/examples/cascading-select.md b/packages/react-renderer-demo/src/pages/examples/cascading-select.md
new file mode 100644
index 000000000..9f0e656db
--- /dev/null
+++ b/packages/react-renderer-demo/src/pages/examples/cascading-select.md
@@ -0,0 +1,18 @@
+import DocPage from '@docs/doc-page';
+import CodeExample from '@docs/code-example';
+
+<DocPage>
+
+# Cascading select
+
+This example shows how to integrate that asynchronously loaded select depends on a value from different select.
+
+This select combines common DDF select with [value listener](/examples/value-listener). To change `loadOptions` prop you have to tell the component that the function is being changed. If you provide a function, that has the same string representation, you have to provide `loadOptionsChangeCounter` (*number*) prop to trigger a data reload.
+
+Using `noValueUpdates` (*boolean*) prop you control whether the value is being cleared when is not found in the current options array.
+
+## Preview
+
+<CodeExample source="components/examples/cascading-select" mode="preview" />
+
+</DocPage>