Add option to show additional field

[dannyvankooten]

Have users choose an extra field to show next to the email field (optional).

[dannyvankooten]

09c2bb9 adds a few filters that make it possible to add more fields to the bar programmatically.

Example

add_action( 'mctb_before_submit_button', function() {
    echo '<input type="text" name="NAME" placeholder="Your name" />';
});

add_filter( 'mctb_merge_vars', function( $vars ) {
    $vars['NAME'] = ( isset( $_POST['name'] ) ) ? $_POST['name'] : '';
    return $vars;
});