Need to reload page twice, when calling woocommerce_product_query - php

Question

I've got these 3 functions in my functions.php (sorry for the newbie code).
There's a submit button, and a dropdown. User selects a country in the list of options and press submit. The custom_product_query_tax_query is then run, and sorts the products by the slug Denmark or Europa. It's working, however, I need to press the submit button twice, or atleast reload the page manually for the changes to be visible.
Do I need to call the woocommerce_product_query before other content, or am I simply doing it all wrong?
//Before shop loop we inject the dropdown form with submit button.
//We also preselect the last option choosen, based on the country in session.
function report_button()
{
// display button only on posts
if ( !is_single() )
{
$retrive_data = WC()->session->get( 'Country' );
$denmark = '';
$europe = '';
if($retrive_data === 'Denmark')
{
$denmark = 'selected';
}
else
{
$europe = 'selected';
}
$content .= '<form action="" method="POST">
<select name="select_name[]" id="">
<option value="Europe" '. $europe .'>Vis alle produkter</option>
<option value="Denmark" '. $denmark .'>Vis kun lovlige i Danmark</option>
</select>
<input type="submit">
</form>';
echo $content;
}
}
add_action( 'woocommerce_before_shop_loop', 'report_button', 10 );
//On submit, we set the selected country in a session variable.
add_action( 'template_redirect', 'wpse149613_form_process' );
function wpse149613_form_process()
{
if(isset($_POST['select_name'])){ // select_name will be replaced with your input filed name
$getInput = $_POST['select_name']; // select_name will be replaced with your input filed name
foreach ($getInput as $option => $value) {
$selectedOption = $value;
WC()->session->set( 'Country' , $selectedOption );
}
}
}
//Custom woocommerce product query, show only products with Slug, Denmark.
function custom_product_query_tax_query( $q )
{
if( is_admin() ) return $q;
$retrive_data = WC()->session->get( 'Country' );
if ( $retrive_data == 'Denmark' )
{
$tax_query = (array) $q->get( 'tax_query' );
$tax_query[] = array(
'taxonomy' => 'product_tag',
'field' => 'slug',
'terms' => array( 'Denmark' ),
'operator' => 'IN'
);
$q->set( 'tax_query', $tax_query );
}
else
{
return $q;
}
}
add_filter( 'woocommerce_product_query', 'custom_product_query_tax_query', 10, 2 );

Answer 1

Alright, I seem to have found the answer elsewhere. The template_redirect function hook, needs somewhere to redirect to. I added this to the buttom of the code, and it works!
$current_url = home_url( add_query_arg( array(), $wp->request ) );
wp_redirect($current_url);
exit;