Contact Form 7 – Dynamically populate dropdown list

Populate Select List

We can achieve the result with some really simple PHP, using the wpcf7_form_tag_data_option action hook. I failed to find any good documentation about this powerful feature. That’s why I wrote this post.

add_filter( 'wpcf7_form_tag_data_option', 'dynamic_select_list', 10, 3);
function dynamic_select_list($n, $options, $args) {
	if (in_array('division', $options)){
	  $division= array(
		"MAY 07 - NEW ORLEANS, LA",
		"MAY 09 - AUSTIN, TX",
		"MAY 12 - HOUSTON, TX"
	  );
	  return $division;
	}
	return $n;
}

Used

[select divisionname data:division]

Populate Select List With Taxonomy

The following is a more up to date way to dynamically populate the built-in select with options and could easily be extended to support more.

add_filter( 'wpcf7_form_tag', 'dynamic_select_taxonomy', 10 );
function dynamic_select_taxonomy( $tag ) {

    // Only run on select lists
    if( 'select' !== $tag['type'] && ('select*' !== $tag['type']) ) {
        return $tag;
    } else if ( empty( $tag['options'] ) ) {
        return $tag;
    }

    $term_args = array();

    // Loop thorugh options to look for our custom options
    foreach( $tag['options'] as $option ) {

        $matches = explode( ':', $option );

        if( ! empty( $matches ) ) {

            switch( $matches[0] ) {

                case 'taxonomy':
                    $term_args['taxonomy'] = $matches[1];
                    break;

                case 'parent':
                    $term_args['parent'] = intval( $matches[1] );
                    break;

            }
        }

    }

    // Ensure we have a term arguments to work with
    if( empty( $term_args ) ) {
        return $tag;
    }

    // Merge dynamic arguments with static arguments
    $term_args = array_merge( $term_args, array(
        'hide_empty' => false,
    ) );

    $terms = get_terms( $term_args );

    // Add terms to values
    if( ! empty( $terms ) && ! is_wp_error( $term_args ) ) {

        foreach( $terms as $term ) {

            $tag['values'][] = $term->name;

        }

    }

    return $tag;

}

Uses

[select mytaxname taxonomy:category]