1购物车中商品删除功能
页面重新刷新
location.href = '/cart/cart/'
页面重新加载
location.reload()
<a onclick="del_cart({{ goods.0.id }})">删除</a>
function del_cart(id) {
var csrf = $('input[name="csrfmiddlewaretoken"]').val()
$.ajax({
url:'/cart/del_cart/' + id + '/',
type:'POST',
headers:{'X-CSRFToken':csrf},
dataType:'json',
success:function (data) {
删除标签
var nodeGoods = $('#goods_'+ id)
nodeGoods.remove()
cart_price()
},
error:function (data) {
alert('删除失败')
}
})
}
视图层删除函数
def del_cart(request, id):
if request.method == 'POST':
在session中删除购物车中删除的某个商品
session_goods = request.session.get('goods')
for re_goods in session_goods:
if re_goods[0] == id:
session_goods.remove(re_goods)
break
request.session['goods'] = session_goods
删除数据库中对应的session中被删除的数据
user_id = request.session.get('user_id')
if user_id:
ShoppingCart.objects.filter(goods_id=id, user_id=user_id).delete()
return JsonResponse({'code': 200, 'msg': '请求成功'})
2中间件登陆校验
主要区分哪些网址需要校验，哪些不需要校验，在需要校验的强制其跳转到登陆界面进行登陆
class LoggingMiddleware(MiddlewareMixin):
def process_request(self, request):
user_id = request.session.get('user_id')
path = request.path
不需要做登陆校验的地址
not_need_check = ['/user/register/', '/user/login/', '/goods/index/',
'goods/detail/.*', '/cart/.*']
for check_path in not_need_check:
if re.match(check_path, path):
当前path路径为不需要做登陆校验的路由，则直接访问对应页面
return None
if not user_id:
当前path路径为不需要做登陆校验的路由，则直接访问对应页面
return HttpResponseRedirect(reverse('user:login'))
3中间件同步数据库与session中的数据
class SessionToMiddleware(MiddlewareMixin):
def process_response(self, request, response):
同步session中的商品信息和数据库中购物车表的商品信息
1.判断用户是否登陆，登陆才做数据同步操作
user_id = request.session.get('user_id')
if user_id:
2.同步
2.1判断session中的商品是否存在于数据库中，如果存在，则更新
2.2如果不存在，则创建
2.3同步数据库的数据到session中
session_goods = request.session.get('goods')
if session_goods:
将session中的数据同步到数据库
for se_goods in session_goods:
# se_goods结构为[goods_id,num,is_select]
cart = ShoppingCart.objects.filter(user_id=user_id, goods_id=se_goods[0]).first()
if cart:
更新商品信息
if cart.nums != se_goods[1] or cart.is_select != se_goods[2]:
cart.nums = se_goods[1]
cart.is_select = se_goods[2]
cart.save()
else:
创建
ShoppingCart.objects.create(user_id=user_id, goods_id=se_goods[0],
nums=se_goods[1], is_select=se_goods[2])
同步数据库的数据到session中
db_carts=ShoppingCart.objects.filter(user_id=user_id)
组装多个商品格式:[[goods_id,num,is_select],[goods_id,num,is_select]]
if db_carts:
new_session_goods = [[cart.goods_id, cart.nums, cart.is_select] for cart in db_carts]
request.session['goods'] = new_session_goods
return response
4商品结算总价及小计
cart.goods_price = price；给cart添加一个小计的属性并赋值
def place_order(request):
if request.method == 'GET':
获取当前登陆系统的用户对象
user = request.user
carts = ShoppingCart.objects.filter(user=user, is_select=True).all()
计算小计和总价
total_price = 0
for cart in carts:
小计金额
price = cart.goods.shop_price * cart.nums
给cart添加一个小计的属性并赋值
cart.goods_price = price
总金额
total_price += price
return render(request, 'place_order.html', {'carts': carts, 'total_price': total_price, 'num': len(carts)})
