How do i update in String Array

Question

Hi guys.. I wanna build a shopping cart using Cookies. I wonder how can I update quantity when added the same item. TQ

The following is the data inside CartList (PID, Quantity)
?CartList
"5001,1|5002,1|5003,1"

    Public Sub EditCart(ByVal PID As String, ByVal quantity As Integer)

        If Request.Cookies("CartCookie") Is Nothing = False Then

            Dim CartList As String = Request.Cookies("CartCookie").Value.ToString()
            Dim CartListSplitter As String() = CartList.Split("|"c)

            For Each items As String In CartListSplitter

                If Not items = "" Then
                    Dim item As String() = items.Split(","c)
                    If PID = item(0) Then
                        item(1) += quantity
                        // do something to update quantity and save to CartCookies
                        Exit For
                    End If
                End If

            Next

            Response.Redirect(Request.RawUrl, False)

        End If

    End Sub

Answer 1

Hi @WebSpider ,
I'm guessing that your operations of shopping are like this: firstly, when users add the quantities, it need to pass the PID and the quantity to code behind. So it need you to use ajax webmethod. And then you could update the quantity.Also you want to save the data to cookies,you could do like this:

Response.Cookies["CartCookie"].Value =quantity.ToString();  

Best regards,
Yijing Sun

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Answer 2

Hi @Yijing Sun-MSFT

You're right, i will pass PID and Quantity to the code behind. This is how I add items to the cart.

• Existing cart cookies is 5001,1|5002,1|5003,1
• Will change to 5001,1|5002,1|5003,1|5004,1 if added new item.
• Just wonder how can i change to 5001,1|5002,1|5003,2 if item (5003) has been added twice.

    Dim cartListItems = New List(Of String)() From {
         PID,
         quantity
     }
     AddCart(cartListItems)
  
  
    Public Sub AddCart(ByVal listCookie As List(Of String))
  
        Dim CartList As String = String.Join(",", listCookie)
  
        If Request.Cookies("CartCookie") Is Nothing Then
            Dim CartCookie As New HttpCookie("CartCookie")
            Response.Cookies("CartCookie").Value = CartList
        Else
            Response.Cookies("CartCookie").Value = Request.Cookies("CartCookie").Value & "|" & CartList
        End If
  
        Response.Cookies("CartCookie").Expires = DateTime.Now.AddYears(1)
        Response.Redirect(Request.RawUrl, False)
  
    End Sub
  

Answer 3

Yes. You're right.

I wanna replace the old string and update the cookies accordingly.

Answer 4

Hi @Yijing Sun-MSFT

Tried and quantity will be changed accordingly but will replace 5001 to 5002 as well.

"5001,1|5002,1|5003,1"
to
"5002,2|5002,1|5003,1"

Please advise. TQ