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https://ecommerce.shopify.com/c/ecommerce-design/t/show-promo-discount-section-on-cart-page-207815{% if plus_cart_discount_code %} 

<script> 
  (function($) { 
    $(document).on('page:load page:change', function () {  
      if (localStorage.getItem('storedDiscount')){  
        var discountStored = localStorage.getItem('storedDiscount');   
        $('input[name="discount"]').val(localStorage.getItem('storedDiscount'));  
      }  
      $('form[action="/cart"]').on('submit', function(){ 
        var $discountCode = $('input[name="discount"]').val(); 
        localStorage.setItem('storedDiscount', $discountCode);  
      });   
    });   
  })(jQuery);   
</script> 

<div class="promo-form-holder">
  <div class="promo-form">
    <input autocomplete="off" type="text" name="discount" placeholder="Ajouter un code promo" /> 
  </div>
</div> 

{% endif %}