feat(plugin-form-builder): radio field (#11716)

### What?

A field for input radio

Demo:

<img width="1320" alt="Screenshot 2025-03-15 at 6 54 51 AM"
src="https://github.com/user-attachments/assets/47744e3f-e1ca-4596-bc7c-09f7b2d42c5b"
/>

---

UI code example, using shadcn/ui:

```tsx
import type { SelectField } from '@payloadcms/plugin-form-builder/types'
import type { Control, FieldErrorsImpl } from 'react-hook-form'

import { Label } from '@/components/ui/label'
import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group'
import React from 'react'
import { Controller } from 'react-hook-form'

import { Error } from '../Error'
import { Width } from '../Width'

export const Radio: React.FC<
  SelectField & {
    control: Control
    errors: Partial<FieldErrorsImpl>
  }
> = ({ name, control, errors, label, options, required, width, defaultValue }) => {
  return (
    <Width width={width}>
      <Label htmlFor={name}>{label}</Label>
      <Controller
        control={control}
        defaultValue={defaultValue}
        name={name}
        render={({ field: { onChange, value } }) => {
          return (
            <RadioGroup onValueChange={(val) => onChange(val)} value={value} className="space-y-2">
              {options.map(({ label, value }) => {
                const id = `${name}-${value}`

                return (
                  <div key={value} className="flex items-center space-x-2">
                    <RadioGroupItem value={value} id={id} />
                    <Label htmlFor={id}>{label}</Label>
                  </div>
                )
              })}
            </RadioGroup>
          )
        }}
        rules={{ required }}
      />
      {required && errors[name] && <Error />}
    </Width>
  )
}

```

UI demo:

<img width="651" alt="Screenshot 2025-03-15 at 7 04 37 AM"
src="https://github.com/user-attachments/assets/f3922489-8e62-4464-b48c-8425735421f5"
/>

Co-authored-by: Pan <kpkong@hk01.com>

packages/plugin-form-builder/src/collections/Forms/fields.ts

@@ -28,6 +28,95 @@ const width: Field = {
   label: 'Field Width (percentage)',
 }
 
+const placeholder: Field = {
+  name: 'placeholder',
+  type: 'text',
+  label: 'Placeholder',
+}
+
+const Radio: Block = {
+  slug: 'radio',
+  fields: [
+    {
+      type: 'row',
+      fields: [
+        {
+          ...name,
+          admin: {
+            width: '50%',
+          },
+        },
+        {
+          ...label,
+          admin: {
+            width: '50%',
+          },
+        },
+      ],
+    },
+    {
+      type: 'row',
+      fields: [
+        {
+          ...width,
+          admin: {
+            width: '50%',
+          },
+        },
+        {
+          name: 'defaultValue',
+          type: 'text',
+          admin: {
+            width: '50%',
+          },
+          label: 'Default Value',
+          localized: true,
+        },
+      ],
+    },
+    {
+      name: 'options',
+      type: 'array',
+      fields: [
+        {
+          type: 'row',
+          fields: [
+            {
+              name: 'label',
+              type: 'text',
+              admin: {
+                width: '50%',
+              },
+              label: 'Label',
+              localized: true,
+              required: true,
+            },
+            {
+              name: 'value',
+              type: 'text',
+              admin: {
+                width: '50%',
+              },
+              label: 'Value',
+              required: true,
+            },
+          ],
+        },
+      ],
+      label: 'Radio Attribute Options',
+      labels: {
+        plural: 'Options',
+        singular: 'Option',
+      },
+    },
+    required,
+  ],
+  labels: {
+    plural: 'Radio Fields',
+    singular: 'Radio',
+  },
+}
+
 const Select: Block = {
   slug: 'select',
   fields: [
@@ -68,6 +157,14 @@ const Select: Block = {
         },
       ],
     },
+    {
+      type: 'row',
+      fields: [
+        {
+          ...placeholder,
+        },
+      ],
+    },
     {
       name: 'options',
       type: 'array',
@@ -576,6 +673,7 @@ export const fields = {
   message: Message,
   number: Number,
   payment: Payment,
+  radio: Radio,
   select: Select,
   state: State,
   text: Text,

packages/plugin-form-builder/src/types.ts

@@ -97,6 +97,19 @@ export interface SelectField {
   label?: string
   name: string
   options: SelectFieldOption[]
+  placeholder?: string
+  required?: boolean
+  width?: number
+}
+
+export interface RadioField {
+  blockName?: string
+  blockType: 'radio'
+  defaultValue?: string
+  label?: string
+  name: string
+  options: SelectFieldOption[]
+  placeholder?: string
   required?: boolean
   width?: number
 }
@@ -175,6 +188,7 @@ export type FormFieldBlock =
   | EmailField
   | MessageField
   | PaymentField
+  | RadioField
   | SelectField
   | StateField
   | TextAreaField