Adding optgroup dynamically server-side

[Hiyou]

Hi, I understand we can add optgroup with Quform. With the following dynamic population of data


add_action('quform_pre_display_1', function (Quform_Form $form) {
$select = $form->getElement('quform_1_3');

if ($select) {
$options = array();
$posts = get_posts(array('numberposts' => -1, 'post_type' => 'travel'));

foreach ($posts as $post) {
$options[] = array('label' => $post->post_title, 'value' => $post->post_title, 'id' => $post->ID);
}

$select->setOptions($options);
}
});


How do I add optgroup dynamically as well? E.g. if I want to group id 1-100 in one group, and 101-200 in another group. Thank you.

[Ally]

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