Frontend filters API

Changing filter values within a filter box
To access and change the values of filter items use the asp_pre_get_front_filters hook, as following:
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add_filter('asp_pre_get_front_filters', 'asp_change_a_filter', 10, 2);
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function asp_change_a_filter($filters, $type) {
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  foreach ($filters as $k => &$filter) {
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    // To check some of the attributes:
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    // $filter->label
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    // $filter->display_mode
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    // $filter->position
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    // $filter->id
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    // $filter->type() >> returns the filter type
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    // $filter->field() >> field that is filtered (if applicable)
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    // do a var_dump($filter->data) -> to see the filter data
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    // Go through the filter items via a loop
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    foreach ($filter->get() as $kk => $item) {
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      // Changing a filter attribute: label, selected, value, default by array ID
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      $filter->attr($kk, 'label', 'New Label', true);
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​
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      // Remove the current item by array ID
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      $filter->remove($kk, true);
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    }
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    // You can also change/remove items by key, without a loop
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    // ..for a category/term filter, use the term ID
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    $filter->attr(123, 'label', 'New Label');
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    $filter->remove(123);
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    // ..for a custom field filter, use the field value
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    $filter->attr('value', 'label', 'New Label');
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    $filter->remove('value'); 
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​
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    // Remove values from a custom field filter
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    if ( $filter->type() == 'custom_field' && $filter->field() == 'my_field' ) {
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      $filter->remove(array('value1', 'value2'));
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    }    
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    // Adding a new value to a custom field filter
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    if ( $filter->type() == 'custom_field' && $filter->field() == 'my_field' ) {
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      $filter->add(array(
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        'label' => 'Value label 1',
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        'selected' => false,
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        'value' => 'value1'
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      ));
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      // The second function argument allows setting the value position
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      // Adding a value after the 2nd option
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      $filter->add(array(
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        'label' => 'Value label 2',
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        'selected' => false,
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        'value' => 'value2'
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      ), 2);
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      // Adding a value to before the last option
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      $filter->add(array(
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        'label' => 'Value label 3',
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        'selected' => false,
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        'value' => 'value3'
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      ), -1);
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    }    
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  }
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  return $filters;
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}
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The WD_ASP_FrontFilters singleton class
This API should be used to manage the front-end filter boxes. The class methods can be used to add/remove/modify/find any front-end filter box.
Source
File: wp-content/plugins/ajax-search-pro/includes/classes/core/class-asp-frontfilters.php
The front-end filter management is encapsulated within the WD_ASP_FrontFilters class, and it's instance can be accessed via the..
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wd_asp()->front_filters
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..variable, or if you prefer your own, then:
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$my_variable = WD_ASP_FrontFilters::getInstance();
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Usage
For usage examples, please see the chapter below.
Filters should be added, changed and removed exlusively within the asp_pre_parse_filters and asp_post_parse_filters action hooks. Using any other hooks may result in a malfunction.
Example of changing and removing certain filters by their labels:
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add_action('asp_post_parse_filters', 'asp_change_the_filters', 10, 2);
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function asp_change_the_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        // Change filter position to 1
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        wd_asp()->front_filters->set("Test drop", 'position', 1);
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        // Change filter label
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        wd_asp()->front_filters->set("Test drop", 'label', 'My test drop');
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        // Remove a filter by label
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        wd_asp()->front_filters->remove("Filter by Product categories");
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    }
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}
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Example of adding a custom taxonomy filter:
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add_action('asp_pre_parse_filters', 'asp_add_my_own_filters', 10, 2);
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function asp_add_my_own_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        // Creating a new filter
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        $filter = wd_asp()->front_filters->create(
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            'taxonomy',
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            'My Taxonomy Filter',
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            'dropdown',
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            array(
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                'taxonomy' => 'category'
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            )
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        );
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        // Adding the select all option first
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        $filter->add(array(
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            'id' => 0,
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            'label' => 'Select all',
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            'default' => true,
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            'selected' => true
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        ));
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        // Getting the terms to add
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        $terms = get_terms("category", array(
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            'hide_empty' => false,
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            'fields' => 'id=>name'
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        ));
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        foreach( $terms as $id => $name ) {
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            // Add each taxonomy terms one by one
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            $filter->add(array(
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                'id' => $id,
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                'label' => $name,
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                'taxonomy' => 'category',
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                'default' => false,
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                'selected' => false
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            ));
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        }
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        /**
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         * Make sure to change the filter options, if there was a
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         * redirection to the results page.
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         **/ 
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        $filter->selectByOptions($options);
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        /**
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         * Optionally, you can change the filter position as well, via:
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         * $filter->position = 1;
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         **/
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        // Finally, append the filter
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        wd_asp()->front_filters->add($filter);
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    }
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}
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For methods list and examples, please check below.
Methods list
create()
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create(string $type, string $label = '', string $display_mode = '', array $data = array())
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Creates and returns a new filter object, depending on the $type variable. This will not add the filter automatically to the filters list, only creates a new object. The filter has to be added via the add($filter) method after.
Parameters
$type (string) - The filter type, can be: taxonomy
$label (string) (optional) - The filter box header label
$display_mode (string) (optional) - The display mode of the filter values: checkboxes, input, slider, range, dropdown, radio, dropdownsearch, multisearch
$data (array) (optional) - Additional data, that may be required within the template for this filter depending on the $type and $display_mode
Check the examples below for the usage.
Return values
(aspFilter | aspCfFilter | aspTaxFilter) The new filter object
add()
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add( aspFilter $filter )
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Adds the final $filter object to the front-end filters list.
Parameters
(aspFilter) $filter - The filter object to add to the front-end filters list
Return values
(aspFilter | aspCfFilter | aspTaxFilter) The new filter object
set()
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set( int|string $key, string $attribute, mixed $value )
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Finds a filter by title or ID ($key) and changes it's attribute.
Parameteres
$key (int|string) - Filter ID or filter label text
$attribute (string) - Filter attribute: label, display_mode, data, position
$value (mixed) - Value to change the attribute to
Return values
(bool) true|false - True, when the change was successful, false otherwise.
get()
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get( string $order = 'position', $type = false )
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Gets the registered filters by the given order and the given type
Parameteres
$order (string)(optional) - position or added
$type (bool | string)(optional) - filter type: taxonomy, custom_field or boolean false for everything
Return values
array - Array of front-end filters
remove()
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remove( int|string $key )
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Removes a filter from the front-end filters list, based on the ID or filter label.
Parameters
$key (int|string) - Filter ID or filter label text
Return values
(bool) true|false - True, when the removal was successful, false otherwise.
Examples
Adding custom taxonomy filter
The example below displays adding a custom taxonomy filter, with a select all option. The commented sections contain the possible parameters for this type of filter.
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add_action('asp_pre_parse_filters', 'asp_add_my_own_filters', 10, 2);
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function asp_add_my_own_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        $filter = wd_asp()->front_filters->create(
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            'taxonomy',                // Filter type
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            'My Product cat filter',   // Filter box label 
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            'checkboxes',              // Display mode: checkboxes, dropdown, dropdownsearch, multisearch, radio
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            array(
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                'taxonomy' => 'category',
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                // allowing CPT results that does not match the terms from this taxonomy
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                'allow_empty' => false, 
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                'logic' => 'or' // or, and,
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            )
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        );
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        // The select all must have the ID = 0
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        $filter->add(array(
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            'id' => 0,
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            'label' => 'Select All',
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            'default' => true,
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            'selected' => true
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        ));
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        $filter->add(array(
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            'id' => 81,
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            'label' => 'Clothing',
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            'taxonomy' => 'category',
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            'default' => true,
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            'selected' => true
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        ));
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        $filter->add(array(
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            'id' => 84,
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            'label' => 'Posters',
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            'taxonomy' => 'category',
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            'default' => true,
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            'selected' => true
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        ));
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        /**
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         Another variation, by adding all categories
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            $terms = get_terms("category", array(
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                'hide_empty' => false,
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                'fields' => 'id=>name'
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            ));
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            foreach( $terms as $id => $name ) {
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                $filter->add(array(
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                    'id' => $id,
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                    'label' => $name,
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                    'taxonomy' => 'category',
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                    'default' => false,
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                    'selected' => false
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                ));
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            }
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        */    
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        $filter->selectByOptions($options);
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        wd_asp()->front_filters->add($filter);
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    }
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}
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Dropdown, checkbox and radio type custom field filters
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// --------------------------------
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// Drop down filter example - for WooCoomerce stock status
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// --------------------------------
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add_action('asp_pre_parse_filters', 'asp_add_my_own_filters', 10, 2);
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function asp_add_my_own_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        // Dropdown
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        $filter = wd_asp()->front_filters->create(
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            'custom_field',
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            'Dropdown stock test',
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            // Type: dropdown, dropdownsearch, multisearch or radio
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            'dropdown',
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            array(
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                'field' => '_stock_status',
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                /**
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                 * Operators list:
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                 *  String
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                 *     like  => string matching anywhere
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                 *     elike => string matching exactly
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                 *  Numeric
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                 *     eq   => equals '='
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                 *     neq  => not equal '<>'
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                 *     lt   => less '<'
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                 *     let  => less or equals '<='
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                 *     gt   => greater '>'
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                 *     get  => greater or equals '>='
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                 */
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                'operator' => 'like',
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                // only applies on 'dropdown' type (multiselect for dropdown)
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                'multiple' => true,
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                // or or and, only applies for 'multisearch' or 'dropdown' + multiple
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                'logic' => 'or',
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                // allow match if this custom field is unset
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            )
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        );
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        $filter->add(array(
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            'label' => 'Any stock (empty val)',
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            'value' => '',
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            'selected' => true,
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            'default' => true
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        ));
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        $filter->add(array(
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            'label' => 'Any stock (multi val)',
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            'value' => 'instock::outofstock',
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            'selected' => true,
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            'default' => true
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        ));
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        $filter->add(array(
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            'label' => 'In Stock',
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            'value' => 'instock',
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            'selected' => true,
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            'default' => true
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        ));
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        $filter->add(array(
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            'label' => 'Out of Stock',
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            'value' => 'outofstock',
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            'selected' => false,
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            'default' => false
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        ));
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        $filter->selectByOptions($options);
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        wd_asp()->front_filters->add($filter);
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    }
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}
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Text and hidden type custom field filters
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// --------------------------------
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// Text or hidden filter example
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// --------------------------------
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add_action('asp_pre_parse_filters', 'asp_add_my_own_filters', 10, 2);
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function asp_add_my_own_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        $filter = wd_asp()->front_filters->create(
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            'custom_field',
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            'Text stock',
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            // text or hidden
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            'text',
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            array(
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                'field' => '_stock_status',
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                // See operator list on above example
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                'operator' => 'elike'
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            )
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        );
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        $filter->add(array(
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            'label' => 'Stock status',
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            'value' => 'instock',
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            'default' => 'instock'
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        ));
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        $filter->selectByOptions($options);
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        wd_asp()->front_filters->add($filter);
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    }
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}
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Date type custom field filter
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// --------------------------------
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// Date filter example
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// --------------------------------
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add_action('asp_pre_parse_filters', 'asp_add_my_own_filters', 10, 2);
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function asp_add_my_own_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        $filter = wd_asp()->front_filters->create(
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            'custom_field',
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            'Date test',
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            'datepicker',
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            array(
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                'field' => '_date',
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                'placeholder' => '',
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                // The display date format
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                'date_format' => 'dd/mm/yy',
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                /**
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                 * Date storage format (how the field contains the date)
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                 *  datetime  => standard datetime format, ex.: 2001-03-10 17:16:18
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                 *  timestamp => timestamp format, ex.: 1561971794
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                 *  acf       => custom ACF format (YYYYMMDD): 20191231
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                'date_store_format' => 'datetime'
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            )
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        );
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        $filter->add(array(
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            'label' => 'Date test',
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            /**
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             * Static values
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             * '31/07/2019' => use this format only, DD/MM/YYYY
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             * Relative values
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             * ''         => no value displayed
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             * '+0'       => current date
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             * '+3m +4d'  => 3 months and 4 days from now
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             * '-2m -10d' => 2 months and 10 days before now
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            'value' => '',
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            'default' => ''
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        ));
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        $filter->selectByOptions($options);
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        wd_asp()->front_filters->add($filter);
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    }
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}
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Slider and Range slider custom field filter
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// --------------------------------
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// Slider filter example
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// --------------------------------
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add_action('asp_pre_parse_filters', 'asp_add_my_own_filters', 10, 2);
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function asp_add_my_own_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        $filter = wd_asp()->front_filters->create(
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            'custom_field',
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            'Price slider <=',
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            'slider',
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            array(
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                'field' => '_price',
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                'slider_prefix' => '-,',
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                'slider_suffix' => '.',
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                'slider_step' => 1,
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                'slider_from' => 1,
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                'slider_to'   => 1200,
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                'slider_decimals' => 0,
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                'slider_t_separator' => ' ',
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                /**
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                 * Operators list:
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                 * eq   => equals '='
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                 * neq  => not equal '<>'
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                 * lt   => less '<'
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                 * let  => less or equals '<='
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                 * gt   => greater '>'
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                 * get  => greater or equals '>='
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                 */
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                'operator' => 'let'
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            )
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        );
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        $filter->add(array(
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            'value' => 300,
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            'default' => 300
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        ));
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        $filter->selectByOptions($options);
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        wd_asp()->front_filters->add($filter);
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    }
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}
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​
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// --------------------------------
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// Range slider filter example
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// --------------------------------
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add_action('asp_pre_parse_filters', 'asp_add_my_own_filters', 10, 2);
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function asp_add_my_own_filters($search_id, $options) {
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    if ( $search_id == 1 ) {
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        $filter = wd_asp()->front_filters->create(
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            'custom_field',
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            'Price range filter',
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            'range',
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            array(
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                'field' => '_price',
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                'range_prefix' => '-,',
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                'range_suffix' => '.',
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                'range_step' => 1,
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                'range_from' => 1,
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                'range_to'   => 1200,
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                'range_decimals' => 0,
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                'range_t_separator' => ' '
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            )
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        );
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        $filter->add(array(
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            'label' => 'Clothing',
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            'value' => array(20, 1180),
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            'default' => array(20, 1180)
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        ));
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        $filter->selectByOptions($options);
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        wd_asp()->front_filters->add($filter);
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    }
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}
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​
How to automatically check/select filter values based on the archive page?
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Changing filter values within a filter box
The WD_ASP_FrontFilters singleton class