JavaScript 确认框？

Question

Public Function CheckIfItemPresent(ByVal userID As String, ByVal itemID As String, ByVal itemPrice As Integer, ByVal offer As String) As Boolean
        On Error GoTo galti

        Dim sqlStatement As String = "SELECT itemQtty FROM shoppingCart WHERE userID = '" & _
                                    userID & "' AND itemID = '" & itemID & "'" & _
                                    " AND itemPrice = " & itemPrice & " AND offer = '" & offer & "'"
        Dim con As New SqlClient.SqlConnection("Data Source=.\SQLEXPRESS;" & _
                                               "AttachDbFilename=|DataDirectory|\database.mdf;" & _
                                               "Integrated Security=True;User Instance=True")
        Dim sql As New SqlClient.SqlCommand(sqlStatement, con)
        Dim reader As SqlClient.SqlDataReader

        con.Open()
        reader = sql.ExecuteReader
        reader.Read()
        Dim itemQtty As Integer = reader.Item("itemQtty")
        reader.Close()
        If itemQtty > 0 Then
            If ***MsgBox("Item already present. Add another one? Currently, number of this item in cart: " & itemQtty, MsgBoxStyle.YesNo, "") = MsgBoxResult.Yes*** Then
                itemQtty = itemQtty + 1
                sql.CommandText = "UPDATE shoppingCart SET itemQtty = " & itemQtty & " WHERE " & _
                                    "userID = '" & userID & "' AND itemID = '" & itemID & "' AND itemPrice=" & _
                                    itemPrice & " AND offer = '" & offer & "'"
                sql.ExecuteNonQuery()
            Else
            End If
        End If
        con.Close()
        con.Dispose()
        Return True
        Exit Function
galti:
        con.Close()
        con.Dispose()
        Return False
    End Function

如何使用 javascript 构造框而不是 asp.net msgbox...请检查 * 之间的部分

Answer 1

Javascript 没有直接替代品可以做到这一点。

要与用户交互，您必须将响应发送回可以显示的浏览器，然后用户可以做出选择并向服务器发送另一个包含有关该选择的信息的请求。

因此，您必须在服务器端将其分为两个单独的步骤。

要在 Javascript 中创建确认框，您可以使用 confirm 方法。例子：

var choise = window.confirm('Item already present. Add another one? Currently, number of this item in cart: 42');