Validate custom shortcode

Hi guys,

I’ve created a custom shortcode that retrieves the title of a certain custom post type. These titles are placed in a select box.

I want to make sure that the user has selected one of these titles when filling in the form, so I guess some validation is needed. The official documentation about this doesn’t seem to be sufficient for me and I can’t find any useful topics that help me out.

Here I create the shortcode:

function upcoming_events($tag){
	$tag = new WPCF7_Shortcode( $tag );

	wp_reset_query();

	$output = "<select id='locatie' name='locatie' class='wpcf7-form-control wpcf7-select form-control' onchange='document.getElementById(\"locatie\").value=this.value;'><option disabled selected value> -- selecteer een locatie -- </option>";

	global $post;

	$locaties_args = array(
		'post_type' => 'speeldata',
		'posts_per_page' => -1,
		'orderby' => 'name',
		'order' => 'ASC',
		'meta_query' => array(
			array(
				'key' => 'date',
				'value' => date("Y-m-d"),
				'compare' => '>=',
				'type' => 'DATE'
			),
		),
	);

	$query = new WP_Query( $locaties_args );

	while( $query->have_posts() ) : $query->the_post();
		//var_dump($post);
		$atts = fw_get_db_post_option(get_the_id());

		setlocale(LC_ALL, 'nl_NL');
		$local_date = trim(strftime("%e %B %Y", strtotime($atts['datum'])));

		//var_dump($local_date);

		//var_dump($atts);
		$output .= "<option value='". $post->post_name ."'>". get_the_title() ." (". $local_date .")</option>";
	endwhile;

	$output .= "</select>";

	return $output;
}

function custom_add_shortcode() {
	wpcf7_add_shortcode('upcoming-events', 'upcoming_events', true);
	wpcf7_add_shortcode('upcoming-events*', 'upcoming_events', true);
}

add_action( 'wpcf7_init', 'custom_add_shortcode' );

This all works fine, the value is passed to the mail after the form gets submitted. The only problem is that I want the user to actively make a selection, so I need a default empty value and validation.

I got this so far, I know this is nowhere near the solution but when adding more code I the debug console throws 500 internal server errors at me.

function upcoming_events_validation( $result, $tag) {
    $tag = new WPCF7_Shortcode( $tag );
    
    $result->invalidate( $tag, "Selecteer een locatie" );
 
    return $result;
}
add_filter( 'wpcf7_validate_upcoming_events*', 'upcoming_events_validation');

• This topic was modified 8 years ago by ProxxiM. Reason: some explanation