vc_autocomplete_{tag}_{param_name}_callback

Provides autocomplete suggestions for a specific shortcode parameter via AJAX. The filter name is dynamic — replace {tag} with the shortcode base and {param_name} with the parameter name.

Parameters

Parameter	Type	Description
$query	string	The search query string from the user.
$tag	string	The shortcode base tag.
$param_name	string	The parameter name.

Usage

<?php
add_filter( 'vc_autocomplete_my_shortcode_my_param_callback', 'my_custom_function', 10, 3 );

function my_custom_function( $query, $tag, $param_name ) {
    // Provide custom suggestions for a param
    $suggestions = [];
    $posts = get_posts( [ 's' => $query, 'posts_per_page' => 10 ] );

    foreach ( $posts as $post ) {
        $suggestions[] = [
            'value' => $post->ID,
            'label' => $post->post_title,
        ];
    }

    return $suggestions;
}

Source

File: include/params/autocomplete/autocomplete.php