如何在忍者形式的表单加载之前设置值

Hi I have used following method shown on link to achive this. But field is not populated with the value i pass.

function wpse_158000_populate_field($form_id,$myfield) {
global $ninja_forms_loading;

$my_id_field = 16; //put the id for your hidden field here

//Change the value that a field is pre-populated with.
$ninja_forms_loading->update_field_value($my_id_field, $myfield);
}

add_action('ninja_forms_display_init', 'wpse_158000_populate_field',10,"test");

but it didnt worked.

I have added this code in ninja-forms-modal/includes/shortcodes.php