---
title: "Populate Select, Checkbox, and Radio field option values programmatically in Form (Adv)"
source: "https://docs.nexcess.com/software/kadence/blocks/populate-field-values-programmatically-form-adv/"
description: "This guide explains how to programmatically populate option values for Select, Checkbox, and Radio fields inside the Form (Adv) block. By default, these fields…"
vertical: "Software"
area: "Kadence Blocks"
date: "2025-09-25"
last_modified: "2026-07-02"
---

# Populate Select, Checkbox, and Radio field option values programmatically in Form (Adv)

This guide explains how to programmatically populate option values for **Select**, **Checkbox**, and **Radio** fields inside the **[Form (Adv)](https://docs.nexcess.com/software/kadence/advanced-form-block/)** block.

By default, these fields require options to be entered manually. Since **Dynamic Content is not yet supported**, you can instead use the WordPress **render\_block\_data** filter to inject options automatically. These options can come from **arrays, WordPress posts, taxonomies, or other data sources**.

Each option must be returned as an array with two keys:

- **label** → the text displayed to users
- **value** → the stored value when the form is submitted

Want to see this functionality built-in without the need of custom code? Then, consider [voting on this Feature Request](https://feedback.kadencewp.com/p/adv-form-select-dynamic-options) to show your support. We often implement popular requests into our products.

Example 1: Static Options (Array)

Use this approach when you want a predefined set of options, such as countries, departments, or product categories.

```php
add_filter('render_block_data', function ($parsed_block, $block, $parent_block ) {
    $inputName = $block['attrs']['inputName'];

    // Match your Field Name
    if ('my-dynamic-field' === $inputName ) {
        $parsed_block['attrs']['options'] = get_dynamic_options();
    }

    return $parsed_block;
}, 20, 3);

function get_dynamic_options(): array {
    $items = [
        'Option 1',
        'Option 2',
        'Option 3',
    ];

    return array_map(function ($item) {
        return [
            'value' => $item,
            'label' => $item,
        ];
    }, $items);
}
```

**Usage**

1. In your **Form (Adv) block**, select the field.
2. Go to **Advanced > Extra Settings > Field Name**.
3. Enter **my-dynamic-field** ([view screenshot](https://docs.nexcess.com/wp-content/uploads/2026/06/Edit-Page-Test1234-‹-Bonn-Joel-—-WordPress-2025-09-25-at-3.55.08-PM-373x1024-1.jpg))

Example 2: Dynamic Options from Posts (Using WP\_Query)

```php
add_filter('render_block_data', function ($parsed_block, $block, $parent_block ) {
    $input_name = $block['attrs']['inputName'];

    if ( isset( $input_name ) && 'post-dropdown' === $input_name ) {
        $parsed_block['attrs']['options'] = get_dynamic_post_options();
    }

    return $parsed_block;
}, 20, 3);

function get_dynamic_post_options(): array {
    $options = [];

    $query = new WP_Query([
        'post_type'      => 'post',    // Change to custom post type if needed
        'posts_per_page' => 10,        // Adjust limit
        'post_status'    => 'publish',
        'orderby'        => 'date',
        'order'          => 'DESC',
    ]);

    if ($query->have_posts()) {
        foreach ($query->posts as $post) {
            $options[] = [
                'value' => (string) $post->ID, // Stored on form submission
                'label' => $post->post_title,  // Shown in dropdown
            ];
        }
    }

    wp_reset_postdata();

    return $options;
}
```

### **Usage**

1. In your Form block, select the field.
2. In **Advanced > Extra Settings > Field Name**, enter: **post-dropdown**
3. The field will now display the latest 10 posts as selectable options.

With these approaches, you can programmatically populate **Select**, **Checkbox**, and **Radio** fields in Form (Advanced), pulling from either static data or dynamic WordPress content.