Version: 2.0.8
Plugin page: https://pluginus.net/shop/wordpress-plugins/wordpress-filter-plugins/taxonomy-chain-menu/

Demo pages:
- http://cars.wp-filter.com/simple-taxonomy-chain-menu/
- http://woocommerce.wp-filter.com/simple-taxonomy-chain-menu-2/
- https://demo.posts-table.com/taxonomy-chain-menu/ - compatible with TABLEON
- https://demo.products-tables.com/taxonomy-chain-menu/ - compatible with WOOT
- https://demo.products-filter.com/taxonomy-chain-menu/ - compatible with WOOF filtration behavior


Example of the shortcode:
    [taxonomy_chain_menu post_type='product' taxonomy='product_cat' parent_id=0 exclude='36,12' watch_view='posts' show_count=1 button_title='Watch It' target='_blank' label_taxonomy='Producer|Model' label_post='Select car' chain_id='chain1' connect_table='ttt1']

The shortcode attributes list:
* post_type – what post type to use in the chain menu. Default type is 'post'.
* taxonomy – what taxonomy terms to navigate. Default taxonomy is 'category'.
* term_id – started term ID, 0 means all from the top.
* exclude – terms ids to hide from the chain. For example: 12,44,73.
* include – terms ids to show only. Opposite to 'exclude'. For example: 11,43,72.
* include_top – terms ids related to the top only. For example: 10,42,71.
* show_count – show/hide count of posts of the terms in drop-downs options. Default value is 0.
* target – how to open selected post/terms. Default is: '_self' (opening in the same browser tab). To open in another tab use: '_blank'
* watch_view – values: 'posts', 'terms', 'none'. What to show on the end of the chain. Posts - drop-down with posts. Terms - button with link to posts of the term selected in the last drop-down. None - nothing, good for products tables filtering.
* label_taxonomy - label(s) of the drop-down(s). Example: Producer|Model
* label_post - label of the posts drop-down

Also it is possible to use custom actions (started from 'call_filter_') for translations, example: [taxonomy_chain_menu label_taxonomy='call_filter_chain1' label_post='call_filter_chain1-post']
In file functions.php add next code:
add_filter('chain1', function($args) {

    $res = 'Producer|Model';

    if (defined('ICL_LANGUAGE_CODE')) {
        switch (ICL_LANGUAGE_CODE) {
            case 'es':
                $res = 'Productor|Modelo';
                break;
            case 'uk':
                $res = 'Виробник|Модель';
                break;
        }
    }

    return $res;
}, 10, 1);

add_filter('chain1-post', function($args) {

    $res = 'Select car';

    if (defined('ICL_LANGUAGE_CODE')) {
        switch (ICL_LANGUAGE_CODE) {
            case 'es':
                $res = 'Seleccionar coche';
                break;
            case 'uk':
                $res = 'Яке твое авто';
                break;
        }
    }

    return $res;
}, 10, 1);

* button_title – title for the button at the end of the chain. By default it is 'GO!'. It is also is possible to use action, example:
//[taxonomy_chain_menu post_type='product' taxonomy='product_cat' button_title='call_filter_chain1-btn']
add_filter('chain1-btn', function($args) {

    $res = 'Take it!';

    if (defined('ICL_LANGUAGE_CODE')) {
        switch (ICL_LANGUAGE_CODE) {
            case 'es':
                $res = 'Tomar lo!';
                break;
            case 'uk':
                $res = 'Забираймо!';
                break;
        }
    }

    return $res;
}, 10, 1);

* ready_chain - allows to display pre-selected values in the chain menu, example: 
[taxonomy_chain_menu watch_view='posts' ready_chain='17,20,post(51)'] - at the end of the chain will be displayed 
drop-down with posts and button with the link to the selected post. If exists more sub-categories use 0 (zero) at the end: 
[taxonomy_chain_menu ready_chain='17,20,0']

* chain_id - unique JavaScript identifier for js event 'taxonomy-chain-menu' and in custom WordPress actions
* connect_table - unique identifier of posts/products table set in its shortcode attribute or backend settings. 
It is possible to use Taxonomy Chain Menu as filter with posts and products table plugins: 
TABLEON - WordPress Posts Table Filterable https://posts-table.com/ and 
WOOT - WooCommerce Products Table https://products-tables.com/
Such scripts cooperation is possible thanks to JavaScript event 'taxonomy-chain-menu' 
and shortcode attributes 'chain_id' with 'connect_table'
* label_before - any words before first drop-down
add_filter('chain1-before', function($args) {

    $res = 'Take our best products:';

    if (defined('ICL_LANGUAGE_CODE')) {
        switch (ICL_LANGUAGE_CODE) {
            case 'es':
                $res = 'Toma nuestros mejores productos:';
                break;
            case 'uk':
                $res = 'Візьміть наші найкращі продукти:';
                break;
        }
    }

    return $res;
}, 10, 1);
* do_filter - accepted from the box only one value 'woof' (demo: https://demo.products-filter.com/taxonomy-chain-menu ), but 
it is possible to adapt any another wordpress/woocommerce filter plugin using js event taxonomy-chain-menu-do-filter and values there: e.detail.term_id, e.detail.slug, e.detail.container

* select_wrapper - (from 2.0.8) has only one value 'selectron23' and allows to wrap drop-down in more
reach html-element Selectron23 https://c2n.me/4bp12P2.png . Use with attribute 'chain_id' to separate functionality
for different chain menus. Use hook 'taxonomy-chain-menu-option-data' to set all the data.
See code example (add to file functions.php) below to set data in Selectron23 drop-down:

add_filter('taxonomy-chain-menu-option-data', function($id, $taxonomy, $parent_id, $chain_id) {
    $data = [];

    $get_thumbnail = function ($thumbnail_id, $size = 'thumbnail') {
        $img = wp_get_attachment_image_src($thumbnail_id, $size);
        if (!isset($img[0])) {
            $img = wp_get_attachment_url($thumbnail_id);
        } else {
            $img = $img[0];
        }

        return $img;
    };

    //+++
    if ($chain_id === 'chain1') {
        if ($taxonomy === 'product_cat') {
            $term_id = $id;
            if ($term_id > 0) {
                $data['text'] = strip_tags(tag_description($term_id));
                $thumbnail_id = get_term_meta($term_id, 'thumbnail_id', true);
                $data['img'] = $get_thumbnail($thumbnail_id);
            } else {
                //labels
                $deep = 0;
                if ($parent_id > 0) {
                    $deep = count(get_ancestors($parent_id, $taxonomy)) + 1;
                }

                switch ($deep) {
                    case 0:
                        $data['text'] = 'Best producers';
                        $data['img'] = $get_thumbnail(31);
                        break;
                    case 1:
                        $data['text'] = 'Best models';
                        $data['img'] = $get_thumbnail(32);
                        break;
                    case 2:
                        $data['text'] = 'Best sub-models';
                        $data['img'] = $get_thumbnail(30);
                        break;
                }
            }
        }

        if ($taxonomy === 'is_post') {
            $post_id = $id;
            $data['text'] = 'Any short text about post here';
            $data['img'] = $get_thumbnail(get_post_thumbnail_id($post_id)); //featured image
        }
    }
    return $data;
}, 10, 4);


* select_width - (from 2.0.8) widths for drop-downs in chain. Use one value or some separated by '|'.
Example: select_width='300px|200px|100px'

* max_posts_count - (from 2.0.8) set maximum count of posts in posts drop-down

* posts_orderby - (from 2.0.8) how to order by posts in posts drop-down (title, id, meta). By default title.

* posts_order - (from 2.0.8) posts order direction in posts drop-down. Possible values: ASC, DESC

* posts_order_meta_key - (from 2.0.8) here is meta key by which posts in posts drop-down should be ordered. 
Be care, meta values should exist in the requested posts. Example: [taxonomy_chain_menu post_slug='product' taxonomy='product_cat' posts_orderby='meta_value_num' posts_order_meta_key='prod_1' posts_order='DESC']

* selectron23_max_open_height - (from 2.0.8) works if wrapper selectron23 applied. Defines maximum drop-down height if opened,
if drop-down is large vertical scroll appears. In px only. Value example: '150|200|300' - for first, second and third drop-down


+++++++++++++++++++++++++++++++++++++++++++++++++++++

Hooks:
- taxonomy-chain-menu-option-data: for data set when selectron23 applied
- hook taxonomy-chain-menu-loader: to change loader image
- taxonomy-chain-menu-do-filter: (for dev only) hook for filter plugins. In code called as: $.dispatchEvent(new CustomEvent('taxonomy-chain-menu-do-filter', {detail: {term_id, slug, container}}));