Hide enquiry button when product is on stock - php

Question

How can I hide a specific button, based on the stock status of my product?
The plugin is creating this class:
function wdm_pefree_init() {
// phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
if ( ! class_exists( 'Product_Enquiry_For_Woocommerce', false ) ) {
include_once WDM_PE_PLUGIN_PATH . '/includes/class-product-enquiry-for-woocommerce.php';
}
Product_Enquiry_For_Woocommerce::instance();
}
I only want to display this button the single product page of every product that is in backorder, but I can't get my code to work.
I'm not that great with PHP, so I'm trying to adapt some other code I have on my functions.php file, but without any luck.
Any help would be great, thanks!
I've tried this code:
add_filter('woocommerce_get_availability', 'wcs_custom_get_availability', 1, 2);
function wcs_custom_get_availability($availability, $_product) {
// Remove Enquiry Button
if (!$_product->is_in_stock()) {
remove_action('Product_Enquiry_For_Woocommerce');
}
return $availability;
}
I also see that the css class for the button is .pe-show-enq-modal, but I can't do a conditional "visibility: hidden" that only works for backorder products.

Answer 1

What you are looking for is this:
add_action( 'woocommerce_single_product_summary', 'remove_enquiry_button_if_out_of_stock', 30 );
function remove_enquiry_button_if_out_of_stock() {
global $product;
if ( ! $product->is_in_stock() ) {
remove_action( 'woocommerce_single_product_summary', array( Product_Enquiry_For_Woocommerce::instance(), 'enquiry_button' ), 25 );
}
}
Or Via CSS :
.product.out-of-stock .pe-show-enq-modal {
display: none;
}

Answer 2

The only way I got this (kinda) working was by using this JS:
function remove_enquiry() {
?>
<script type="text/javascript">
(function($){
$(document).ready(function(){
if($(".in-stock").length)
$(".pe-show-enq-modal").hide();
});
})(jQuery);
</script>
<?php
}
add_action('wp_head', 'remove_enquiry');
You can see it here.
But if you notice, it has a delay executing the JS, because when the page loads, the button still shows up for a brief moment (otherwise it seems to be working ok).