Force top discount code field to be visible

force-top-discount-code-field-to-always-open.php

<?php   // do not copy this line.
/**
 * This recipe will force the top discount code to be open without clicking anything
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_open_discount_code_init()
{
    
    //define the fields
	$fields = array();
	$fields[] = new PMPro_Field(" ", "html", array("html"=>
	'<script>
		jQuery(document).ready(function() {
			jQuery("#other_discount_code_tr").show();
			jQuery("#other_discount_code_p").hide();
		});
	</script>'));
	

    //add the fields into a new checkout_boxes are of the checkout page
    foreach($fields as $field)
        pmpro_add_user_field(
            "before_submit_button", // location on checkout page
            $field            // PMPro_Field object
        );
   
}
add_action("init", "my_open_discount_code_init");