Added an argument for the $categories
Input the ID of the parent to display all the subcategories.
function ba_SearchFilter($query) {
if (!$query->is_search) {
return $query;
}
if (isset($_POST['cat'])){
$query->set('category__and', $_POST['cat']);
}
if (isset($_POST['tags'])){
$query->set('tag__and', $_POST['tags']);
}
return $query;
}
//hook filters to search
add_filter('pre_get_posts','ba_SearchFilter');
function ba_search_with_filters(){
$out="<form role="search" method="get" id="searchform" action="". home_url( "https://wordpress.stackexchange.com/" ).'">
<div><label class="screen-reader-text" for="s">Search for:</label>
<input type="text" value="" name="s" id="s" /><br />';
$args = array ( 'child_of' => 1 );
$categories= get_categories( $args );
foreach ($categories as $category) {
$option = '';
$option .= '<input type="checkbox" name="cat[]" id="cat[]" value="'.$category->term_id.'"> ';
$option .= $category->cat_name .'<br />';
$out.= $option;
}
$out .='<input type="submit" id="searchsubmit" value="Search" />
</div>
</form>';
return $out;
}
add_shortcode('search_with_filter','ba_search_with_filters');