How to refresh after selecting a variant in product-form.liquid?

Store Design
1

I have the following code in my 'product-form.liquid’ file:


{% if selected_variant.inventory_quantity <= 0 and product.type == "Matras" %}

Order (3 -4 weeks)

{% endif %}

This works but does not gets refreshed after selecting another variant which is on stock.

Any idea how I can trigger this to be checked after a variant selection?

Thanks