将click事件添加到listView中生成的imagebutton中 [英] add click event to an imagebutton generated in listView

问题描述

大家好，对于asp.net来说是一个很新的东西，我试图实现一个在listView中生成的添加到购物车"按钮.
单击imagebutton时，试图将产品ID和数量= 1添加到我的sortedlist会话中
我尝试使用命令参数但没有成功
我做对了吗?

hi all, am quite new to asp.net am trying to implement an ''add to cart'' button which is generated in a listView
on clicking the imagebutton am trying to add the the product id and quantity=1 to my sortedlist Session
i tried to use command argument but no success
am i doing it right ?

<asp:ListView  ID="listview1" GroupItemCount="3" runat="server">
        <LayoutTemplate>
            <div id="itemListView">
                <asp:PlaceHolder runat="server" ID="groupPlaceHolder" />
            </div>
        </LayoutTemplate>
        <GroupTemplate>
            <div style="clear: both;">
                <asp:PlaceHolder runat="server" ID="itemPlaceHolder" />
            </div>
        </GroupTemplate>
        <ItemTemplate>
            <div class="lvProduct">
                
               
                <div class="productDisplayImage">
                        <asp:Imagebutton  imageURl='<%# Eval("imageUrl") %>'

                       PostBackUrl= '<%#string.concat("~/productDetail.aspx?pid=",Eval("pid")) %>'

                       

                        width="175px" Height="160px" runat="server"/>
                        
                </div>
                
                <div class="productPriceDisplay">
                        Price: $<%# Eval("price")%> <asp:ImageButton imageUrl="~/assignment/images/addToCartButton.png" ImageAlign="top" 

 onCommand="addToCart" commandArgument= '<%#string.concat("Eval("pid")) %>'                        
                        Width="100px" height="25px" style="margin-left:10px;" runat="server"/>
                </div>
            </div>
        </ItemTemplate>
        <Itemseparatortemplate>
            <div class="itemSep">
            </div>
        </ItemSeparatorTemplate>
        <GroupSeparatorTemplate>
            <div class="groupSep">
            </div>
        </GroupSeparatorTemplate>
        <EmptyDataTemplate>
        </EmptyDataTemplate>
    </asp:ListView>

Protected Function addToCart(ByVal sender As Object, ByVal e As CommandEventArgs) As Integer



        Dim pid As String = e.CommandArgument.ToString


        If Not IsNothing(Session("cart")) Then
            Dim slCart As SortedList = CType(Session("cart"), SortedList)
            slCart.Add(pid, "1")
            Response.Redirect("~/testing.aspx")
        Else
            Dim slCart As New SortedList

            slCart.Add(pid, "1")
 Response.Redirect("~/testing.aspx")

        End If

        Return Nothing
    End Function

推荐答案

<％#Eval(" )％> < asp:ImageButton imageUrl =" ImageAlign =" 顶部" onCommand =" addToCart" commandArgument " Eval("<​​/span> pid ))％>' 宽度=" 100px height =" 25px " margin-left:10px; " server " itemSep > </div> </ItemSeparatorTemplate> < GroupSeparatorTemplate> < div class =" groupSep > </div> </GroupSeparatorTemplate> < EmptyDataTemplate> </EmptyDataTemplate> </asp:ListView>

<%# Eval("price")%> <asp:ImageButton imageUrl="~/assignment/images/addToCartButton.png" ImageAlign="top" onCommand="addToCart" commandArgument= '<%#string.concat("Eval("pid")) %>' Width="100px" height="25px" style="margin-left:10px;" runat="server"/> </div> </div> </ItemTemplate> <Itemseparatortemplate> <div class="itemSep"> </div> </ItemSeparatorTemplate> <GroupSeparatorTemplate> <div class="groupSep"> </div> </GroupSeparatorTemplate> <EmptyDataTemplate> </EmptyDataTemplate> </asp:ListView>

Protected Function addToCart(ByVal sender As Object, ByVal e As CommandEventArgs) As Integer



        Dim pid As String = e.CommandArgument.ToString


        If Not IsNothing(Session("cart")) Then
            Dim slCart As SortedList = CType(Session("cart"), SortedList)
            slCart.Add(pid, "1")
            Response.Redirect("~/testing.aspx")
        Else
            Dim slCart As New SortedList

            slCart.Add(pid, "1")
 Response.Redirect("~/testing.aspx")

        End If

        Return Nothing
    End Function

您遇到的问题是因为触发addCart方法时，会话变量"cart"为空/为空.我已更新您的代码，如下所示:

The issue you are having is because the session variable "cart" is nothing/null when the addCart method is fired. I have updated your code as below:

Protected Function addToCart(ByVal sender As Object, ByVal e As CommandEventArgs) As Integer



        Dim pid As String = e.CommandArgument.ToString


        If Not IsNothing(Session("cart")) Then
            Dim slCart As SortedList = CType(Session("cart"), SortedList)
            slCart.Add(pid, "1")
            Response.Redirect("~/testing.aspx")
        Else
            Dim slCart As New SortedList

            slCart.Add(pid, "1")
            Session("cart") = slCart '<-- Missing this line
            Response.Redirect("~/testing.aspx")

        End If

        Return Nothing
    End Function

为了进一步增强页面逻辑的机制并遵循良好的编码习惯，请将会话购物车变量定义为类成员:

To further enhance the mechanics of your page logic and to work with good coding practice, is to define your session cart variable as a class member:

Private Property cart() As SortedList
       Get
           If Session("cart") Is Nothing Then
               Session("cart") = New SortedList
           End If
           Return Session("cart")
       End Get
       Set(ByVal value As SortedList)
           Session("cart") = value
       End Set
   End Property

这篇关于将click事件添加到listView中生成的imagebutton中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！