Mam pętlę dla mojego niestandardowego typu postów workshop filtrowane za pomocą dwóch niestandardowych taksonomii group I teacher na tej samej stronie. Filtr Ajax działa idealnie.

Każde łącze filtra działa z <input type="checkbox">, dla obu list taksonomii. Gdy użytkownik zaznaczy w filtrze jedno lub wiele terminów, a następnie odznaczy je wszystkie, filtr zwróci komunikat „Nie znaleziono wpisów”, ponieważ nic nie jest zaznaczone.

To, co chciałbym zrobić, to gdy użytkownik odznaczy wszystkie warunki w filtrze, wyświetli wszystkie posty mojego niestandardowego typu postów.

Kod PHP filtra dla frontendu:

<form action="<?php echo site_url() ?>/wp-admin/admin-ajax.php" method="POST" id="filter">

  <div>
  <?php
    if( $groups = get_terms( array( 'taxonomy' => 'group' ) ) ) :
      echo '<ul class="groups-list">';
      foreach( $groups as $group ) :
         echo '<input type="checkbox" class="" id="group_' . $group->term_id . '" name="group_' . $group->term_id . '" /><label for="group_' . $group->term_id . '">' . $group->name . '</label>';
       endforeach;
       echo '</ul>';
     endif;
   ?>
   </div>

   <div>
   <?php
     if( $teachers = get_terms( array( 'taxonomy' => 'teacher' ) ) ) :
       echo '<ul class="teachers-list">';
       foreach( $teachers as $teacher ) :
         echo '<input type="checkbox" class="" id="teacher_' . $teacher->term_id . '" name="teacher_' . $teacher->term_id . '" /><label for="teacher_' . $teacher->term_id . '">' . $teacher->name . '</label>';
                             
        endforeach;
        echo '</ul>';
     endif;
   ?>
   </div>

   <input type="hidden" name="action" value="myfilter">
</form>

Kod PHP dla filtra AJAX w functions.php:

function mysite_filter_function(){

//groups checkboxes
if( $groups = get_terms( array( 'taxonomy' => 'group' ) ) ) :
$groups_terms = array();

foreach( $groups as $group ) {
    if( isset( $_POST['group_' . $group->term_id ] ) && $_POST['group_' . $group->term_id] == 'on' )
         $groups_terms[] = $group->slug;
}
endif;

//teachers checkboxes
if( $teachers = get_terms( array( 'taxonomy' => 'teacher' ) ) ) :
$teachers_terms = array();

foreach( $teachers as $teacher ) {
    if( isset( $_POST['teacher_' . $teacher->term_id ] ) && $_POST['teacher_' . $teacher->term_id] == 'on' )
         $teachers_terms[] = $teacher->slug;
}
endif;



if (empty($groups_terms) || empty($teachers_terms) ) {
 $relation = 'OR';
}else{
 $relation = 'AND';
}

$args = array(
    'orderby' => 'date',
    'post_type' => 'workshop',
    'posts_per_page' => -1,
    'tax_query' => array(
        'relation' => $relation,
        array(
            'taxonomy' => 'group',
            'field' => 'slug',
            'terms' => $groups_terms
        ),
        array(
            'taxonomy' => 'teacher',
            'field' => 'slug',
            'terms' => $teachers_terms
        )
    )
);

$query = new WP_Query( $args );

if( $query->have_posts() ) :
    while( $query->have_posts() ): $query->the_post();
        echo '<h2>' . $query->post->post_title . '</h2>';

    endwhile;
    wp_reset_postdata();
else :
    echo 'No posts found';
endif;

die();
}
add_action('wp_ajax_myfilter', 'mysite_filter_function');
add_action('wp_ajax_nopriv_myfilter', 'mysite_filter_function');

Kod JS:

$('#filter').change(function(){
    var filter = $('#filter');
    $.ajax({
        url:filter.attr('action'),
        data:filter.serialize(),
        type:filter.attr('method'),
        beforeSend:function(xhr){
            //filter.find('button').text('Processing...');
        },
        success:function(data){
            //filter.find('button').text('Filter');
            $('.loop-archive-workshop').html(data);
        }
    });
    return false;
});

Dzięki!