Private Function StoreCouponCode() As String
Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("DBConnectionString").ConnectionString)
Dim sql As New SqlCommand("", con)
Dim sqlGetSlNo As New SqlCommand("SELECT MAX(SlNo) FROM Coupons WHERE CustID=" & Convert.ToInt16(HFCustID.Value) & " AND BusiID=" & Convert.ToInt16(HFBusiID.Value) & " AND OfferID=" & Convert.ToInt16(HFOfferID.Value), con)
Dim sNo, UserID, couponCode, offerCheck As String
Dim slNo As Int16
Try
UserID = getCurrentUserID()
con.Open()
sNo = Convert.ToString(sqlGetSlNo.ExecuteScalar) 'fteches latest serial no for the coupon
If sNo = "" Then
slNo = 0
Else
slNo = Convert.ToInt16(sNo) + 1
End If
couponCode = MakeCouponCode(slNo)
offerCheck = couponCode.Substring(13, 3)
sql.CommandText = "INSERT INTO Coupons VALUES (" & _
HFCustID.Value & "," & HFBusiID.Value & "," & HFOfferID.Value & ",'" & _
Today.Date & "'," & Convert.ToString(slNo) & "," & offerCheck & ",'" & couponCode & "','" & _
UserID & "'," & LblPayInAdv.Text & "," & LblPayLater.Text & ",'" & Convert.ToString(Date.Now) & "')"
sql.ExecuteNonQuery()
con.Close()
Catch ex As Exception
couponCode = "N/A"
Finally
con.Dispose()
sql.Dispose()
End Try
Return couponCode
End Function
Protected Sub CmdGetCoupon_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles CmdGetCoupon.Click
If User.Identity.Name = "" Then
LblMessage.Text = "You need to login first!"
Exit Sub
End If
Dim couponCode As String = StoreCouponCode()
Response.Redirect("~/Coupon.aspx?CouponCode=" & couponCode, True)
End Sub
当用户点击CmdGetCoupon
时,需要一段时间才能重定向..因此,用户多次点击CmdGetCoupon
,这会导致从单个用户帐户生成多个优惠券。< / p>
我想显示一条消息“请等待您的优惠券正在生成”并禁用CmdGetCoupon
以便用户无法多次点击....任何想法??如何做到这一点?? < / p>
答案 0 :(得分:5)
在javascript中执行此操作 - 使用OnClientClick
调用禁用传入表单元素的函数。
// On button
... OnClientClick="DisableMe(this);" ...
// Javascript
function DisableMe(elem)
{
elem.disabled = true;
// more code to show message
}
答案 1 :(得分:2)
在你的html方面,你必须将它添加到onClientClick属性中:
<asp:Button ID="CmdGetCoupon" runat="server" onClientClick="this.disabled=true;" />
修改强>
由于@Oded如此准确地指出我的第一个答案没有解决消息的显示,这里有几个选项。
<span id="PleaseWaitContainer"></span>
<asp:Button ID="CmdGetCoupon" runat="server" onClientClick="this.disabled=true;document.getElementById('PleaseWaitContainer').innerText='Please Wait While Your Coupon Is Being Generated';" />
或者
<asp:Button ID="CmdGetCoupon" runat="server" onClientClick="this.disabled=true;alert('Please wait while your coupon is being generated...';" />
答案 2 :(得分:1)
您可以在点击处理程序中禁用该按钮,因为您将重定向到另一个页面,因此不关心任何其他逻辑。 否则,如果您正在执行任何异步操作,请再次单击它后立即禁用它,并在异步回调处理程序中根据逻辑启用它或以其他方式正确处理它。