用c语言编写购物车系统,05-购物车功能实现

定义views页面函数，使其可以传送数据

views.py

@islogin

def cart(request):

uid = request.session['user_id']

carts = CartInfo.objects.filter(user_id=uid)

lenn = len(carts)

context={'title':'购物车',

'page_name':1,

'carts':carts,

'len':lenn}

return render(request,'df_cart/cart.html',context)

#添加商品

@islogin

def add(request,gid,count):

#用户uid购买了gid商品，数量为count

uid=request.session['user_id']

gid = int(gid)

count = int(count)

#查询购物车是否已经有此商品，有则增加

carts = CartInfo.objects.filter(user_id=uid, goods_id=gid)

if len(carts)>=1:

cart=carts[0]

# print '*'*10

# print cart -> 购物车商品数量

cart.count=cart.count+count

else:#不存在则直接加

cart=CartInfo()

cart.user_id=uid

cart.goods_id=gid

cart.count=count

cart.save()

count_s = CartInfo.objects.filter(user_id=uid).count()

request.session['count'] = count_s

#如果是ajax请求则返回json,否则转向购物车

if request.is_ajax():

# count=CartInfo.objects.filter(user_id=request.session['user_id']).count()

print ('*'*10)

print ('ajax')

#--------------未使用

return JsonResponse({'count':count_s})

else:

return redirect('/cart/')

@islogin

def edit(request,cart_id,count):

try:

cart=CartInfo.objects.get(pk=int(cart_id))

count1=cart.count=int(count)

cart.save()

data={'ok':0}

except Exception as e:

data={'ok':count1}

return JsonResponse(data)

@islogin

def delete(request,cart_id):

# try:

cart = CartInfo.objects.get(pk=int(cart_id))

cart.delete()

# print '*'*10

# print ('delete')

# data={'ok':1}

# except Exception as e:

count = CartInfo.objects.filter(user_id=request.session['user_id']).count()

request.session['count'] = count

data={'count':count}

# print '*' * 10

# print (count)

return JsonResponse(data)