feat: refine price formatting and enable dynamic color updates in cart

- Updated price slider and backend formatting to round values instead of showing decimals
- Enhanced product detail page with active color selection display and automatic cart updates
- Adjusted swatch behavior to dynamically update the selected color in the cart via AJAX
- Improved consistency in slider steps and price formatting throughout templates and views

items/views.py

@@ -8,6 +8,7 @@ from django.shortcuts import redirect, render
 
 from favorites.services import get_user_favorite_item_ids
 from items.models import Category, Color, Item, Subcategory
+from orders.models import CartItem
 from orders.services import get_user_cart_item_ids
 
 
@@ -90,7 +91,7 @@ def _resolve_catalog_scope(scope_value: str | None) -> tuple[str | None, str | N
 
 
 def _format_price_value(value: Decimal) -> str:
-    return format(value, "f")
+    return str(int(value))
 
 
 def index(request: HttpRequest, category: str | None = None) -> HttpResponse:
@@ -322,11 +323,20 @@ def detail(request: HttpRequest, category: str, slug: str) -> HttpResponse:
 
     images = list(item.images.all())
 
+    cart_color_id = None
+    if request.user.is_authenticated:
+        cart_item = CartItem.objects.filter(
+            cart__user=request.user, item=item
+        ).select_related('selected_color').first()
+        if cart_item and cart_item.selected_color_id:
+            cart_color_id = cart_item.selected_color_id
+
     return render(request, 'catalog/detail.html', {
         'categories': Category.objects.order_by('name'),
         'item': item,
         'images': images,
         'primary_image': images[0] if images else None,
         'cart_item_ids': get_user_cart_item_ids(request.user),
+        'cart_color_id': cart_color_id,
         'favorite_item_ids': get_user_favorite_item_ids(request.user),
     })

static/js/catalog-price-slider.js

@@ -1,11 +1,11 @@
 document.addEventListener('DOMContentLoaded', function () {
     const priceFormatter = new Intl.NumberFormat('ru-RU', {
-        minimumFractionDigits: 2,
+        minimumFractionDigits: 0,
-        maximumFractionDigits: 2,
+        maximumFractionDigits: 0,
     });
 
     const formatQueryValue = function (value) {
-        return value.toFixed(2).replace(/\.?0+$/, '');
+        return Math.round(value).toString();
     };
 
     document.querySelectorAll('[data-price-slider]').forEach(function (slider) {

templates/catalog/_fragments/side-bar.html

@@ -64,7 +64,7 @@
                         type="range"
                         min="{{ price_slider_min_bound }}"
                         max="{{ price_slider_max_bound }}"
-                        step="0.01"
+                        step="1"
                         value="{{ price_slider_selected_min }}"
                         class="catalog-price-slider__range"
                         aria-label="Минимальная цена"
@@ -74,7 +74,7 @@
                         type="range"
                         min="{{ price_slider_min_bound }}"
                         max="{{ price_slider_max_bound }}"
-                        step="0.01"
+                        step="1"
                         value="{{ price_slider_selected_max }}"
                         class="catalog-price-slider__range"
                         aria-label="Максимальная цена"

templates/catalog/detail.html

@@ -61,13 +61,14 @@
                 <div class="product-summary__swatches" aria-label="Цвета товара">
                     {% for color in colors %}
                         <span
-                            class="product-summary__swatch"
+                            class="product-summary__swatch{% if color.id == cart_color_id %} product-summary__swatch--active{% endif %}"
                             style="background: {{ color.hex_code }};"
                             title="{{ color.name }}"
                             data-color-id="{{ color.id }}"
                         ></span>
                     {% endfor %}
                 </div>
+                <p class="product-summary__color-name" data-color-name>{% for color in colors %}{% if color.id == cart_color_id %}Цвет: {{ color.name }}{% endif %}{% endfor %}</p>
             {% endif %}
             {% endwith %}
 
@@ -77,6 +78,12 @@
 
             <div class="product-summary__actions">
                 {% if item.id in cart_item_ids %}
+                    <form method="post" action="{% url 'orders:add' %}" class="product-summary__cart-form" id="update-color-form" style="display:none;">
+                        {% csrf_token %}
+                        <input type="hidden" name="item_id" value="{{ item.id }}">
+                        <input type="hidden" name="next" value="{{ request.get_full_path }}">
+                        <input type="hidden" name="color_id" id="selected-color-id" value="">
+                    </form>
                     <a class="product-summary__button product-summary__button--primary product-summary__button--link" href="{% url 'orders:cart' %}">
                         Перейти в корзину
                     </a>
@@ -115,18 +122,29 @@
         (function () {
             var swatches = document.querySelectorAll('.product-summary__swatch[data-color-id]');
             var colorInput = document.getElementById('selected-color-id');
+            var colorNameEl = document.querySelector('[data-color-name]');
+            var updateForm = document.getElementById('update-color-form');
             var cartBtn = document.querySelector('.product-summary__button--primary[type="submit"]');
 
             if (!swatches.length || !colorInput) { return; }
 
-            if (cartBtn) { cartBtn.disabled = true; }
+            if (!updateForm && cartBtn) { cartBtn.disabled = true; }
 
             swatches.forEach(function (swatch) {
                 swatch.addEventListener('click', function () {
                     swatches.forEach(function (s) { s.classList.remove('product-summary__swatch--active'); });
                     this.classList.add('product-summary__swatch--active');
                     colorInput.value = this.dataset.colorId || '';
-                    if (cartBtn) { cartBtn.disabled = false; }
+
+                    if (colorNameEl) {
+                        colorNameEl.textContent = 'Цвет: ' + this.title;
+                    }
+
+                    if (updateForm) {
+                        updateForm.submit();
+                    } else if (cartBtn) {
+                        cartBtn.disabled = false;
+                    }
                 });
             });
         }());