Properly display form errors in counter

counter/static/bundled/counter/counter-click-index.ts

@@ -6,6 +6,7 @@ interface InitialFormData {
   /* Used to refill the form when the backend raises an error */
   id?: string;
   quantity?: number;
+  errors?: string[];
 }
 
 interface CounterConfig {
@@ -28,10 +29,12 @@ interface Product {
 class BasketItem {
   quantity: number;
   product: Product;
+  errors: string[];
 
   constructor(product: Product, quantity: number) {
     this.quantity = quantity;
     this.product = product;
+    this.errors = [];
   }
 
   getBonusQuantity(): number {
@@ -59,6 +62,7 @@ exportToHtml("loadCounter", (config: CounterConfig) => {
         for (const entry of config.formInitial) {
           if (entry.id !== undefined && entry.quantity !== undefined) {
             this.addToBasket(entry.id, entry.quantity);
+            this.basket[entry.id].errors = entry.errors ?? [];
           }
         }
 

counter/templates/counter/counter_click.jinja

@@ -72,20 +72,24 @@
           <input type="submit" value="{% trans %}Go{% endtrans %}"/>
         </form>
 
-        <template x-for="error in errors">
-          <div class="alert alert-red" x-text="error">
+        {% for error in form.non_form_errors() %}
+          <div class="alert alert-red">
+            {{ error }}
           </div>
-        </template>
+        {% endfor %}
         <p>{% trans %}Basket: {% endtrans %}</p>
         <form method="post" action="" x-ref="basketForm">
           {% csrf_token %}
-          {{ form.errors }}
-          {{ form.non_form_errors() }}
           <div x-ref="basketManagementForm">
             {{ form.management_form }}
           </div>
           <template x-for="(item, index) in Object.values(basket)">
             <ul>
+              <template x-for="error in item.errors">
+                <div class="alert alert-red" x-text="error">
+                </div>
+              </template>
+
               <button @click.prevent="addToBasket(item.product.id, -1)">-</button>
               <span x-text="item.quantity"></span>
               <button @click.prevent="addToBasket(item.product.id, 1)">+</button>
@@ -188,6 +192,7 @@
             {%- if f.cleaned_data["quantity"] -%}
               quantity: {{ f.cleaned_data["quantity"] | tojson }},
             {%- endif -%}
+            errors: {{ form_errors[loop.index0] | tojson }},
           },
         {%- endif -%}
       {%- endfor -%}

counter/views/click.py

@@ -261,6 +261,11 @@ class CounterClick(CounterTabsMixin, CanViewMixin, SingleObjectMixin, FormView):
                 )
         kwargs["customer"] = self.customer
 
+        # To get all forms errors to the javascript, we create a list of error list
+        kwargs["form_errors"] = []
+        for field_errors in kwargs["form"].errors:
+            kwargs["form_errors"].append(list(field_errors.values()))
+
         if self.object.type == "BAR":
             kwargs["student_card_fragment"] = StudentCardFormView.get_template_data(
                 self.customer