button for resetting all the custom meta fields

What plugin are you using for the custom fields?

I dont have any plug-in, it’s all coding

Hey, I spend a good time to write a code for your requirement.

Step 1: Add JavaScript

Add the following JavaScript to your admin area. You can enqueue it using admin_enqueue_scripts.

jQuery(document).ready(function($) {
    $('#target').on('click', function() {
        if (confirm("Do you really want to delete prices?")) {
            $.ajax({
                url: ajaxurl, // WordPress AJAX URL
                type: 'POST',
                data: {
                    action: 'reset_price_fields', // Custom action to be processed in PHP
                    author_id: $(this).data('author-id') // Pass the author ID
                },
                success: function(response) {
                    alert(response.message); // Show success message
                },
                error: function() {
                    alert('Error resetting prices.'); // Show error message
                }
            });
        }
    });
});

Step 2: Add PHP Function

Add this function to your theme’s functions.php file or a custom plugin.

add_action('wp_ajax_reset_price_fields', 'reset_price_fields');

function reset_price_fields() {
    // Check for the required parameter
    if (!isset($_POST['author_id'])) {
        wp_send_json_error(['message' => 'No author ID provided.']);
        exit;
    }

    $author_id = intval($_POST['author_id']);
    $args = [
        'post_type' => 'apartment', // Change this to your custom post type
        'author' => $author_id,
        'posts_per_page' => -1 // Get all posts
    ];

    $query = new WP_Query($args);

    if ($query->have_posts()) {
        while ($query->have_posts()) {
            $query->the_post();
            $post_id = get_the_ID();

            // Get current custom fields
            $custom_fields = get_post_meta($post_id);

            // Prepare an array of custom fields to reset
            $fields_to_reset = ['price_field_1', 'price_field_2']; // Replace with your custom field keys

            foreach ($fields_to_reset as $field) {
                if (array_key_exists($field, $custom_fields)) {
                    // Delete the specific custom field
                    delete_post_meta($post_id, $field);
                }
            }
        }
        wp_send_json_success(['message' => 'Prices have been reset successfully.']);
    } else {
        wp_send_json_error(['message' => 'No posts found for this author.']);
    }

    wp_reset_postdata();
    exit;
}

Step 3: HTML

Make sure to include the data-author-id attribute in your button to pass the author’s ID.

<button type="button" id="target" data-author-id="<?php echo get_current_user_id(); ?>">Cancella prezzi</button>

Let me know if this works for you & if requires any further modification.

Thanks for your effort, When you say “Add the following JavaScript to your admin area”, do you mean that I have to put the .js file in the wp-admin folder? Or do I put it in the “.js” folder inside my theme? In this same “.js” folder is currently the file “areyousure.js” that controls the pop up with the warning message

I have some problems. I created a .js file: “cancella_prezzi_2.js” for your step 1: I added at the end of your code:

add_action( 'admin_enqueue_scripts', 'reset_price_fields' );

is it correct? then I put the file into wp-admin/js , I’m doing correctly? I also did step 2 and step 3, changing the meta fields names (to clear), but at the moment nothing happens when clicking on the button…(I see the button in my author edit page)…