如何在Repeater中为LinkBut​​ton执行AsyncPostBackTrigger

Question

在我的页面中,我在转发器内部有一个LinkBut​​ton,但UpdatePanel无法找到LinkBut​​ton到AsyncPostBackTrigger.

这是mycode.aspx

<asp:ScriptManager ID="Test1" runat="server" />
<asp:UpdatePanel ID="TestUpdate" runat="server" UpdateMode="Always">
<ContentTemplate>
<table width="100%">
<tr valign="top">
    <td width="50%">
        <asp:Repeater ID="productList" runat="server" onitemcommand="productList_ItemCommand">
        <HeaderTemplate>
        <ul type="disc">
        </HeaderTemplate>
        <ItemTemplate>
        <li>
            <asp:Label id="L1" runat="server" Text='<%# Eval("productName") %>'></asp:Label><br />
            Price:
            <asp:Label runat="server" Text='<%# Eval("productPrice") %>' ></asp:Label>&nbsp;Bath<br />
            <img alt="" src="Images/product/product<%# Eval("productID") %>.png" style="width: 200px; height: 130px" /><br />
            <asp:TextBox ID="num_product" runat="server" Text="0"></asp:TextBox><br />
            <asp:LinkButton ID="order_button" runat="server"><img alt="" src="~/Images/button/order.png" /></asp:LinkButton>
        </li>
        </ItemTemplate>
        <FooterTemplate>
        </ul>
        </FooterTemplate>
        </asp:Repeater> 
    <td>
    <span class="labelText">Order list</span>
        <asp:BulletedList ID="orderList" runat="server" BulletStyle="Numbered">
        </asp:BulletedList> 
    </td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>

这是mycode.aspx.cs

protected void productList_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        //button
        /*LinkButton btn = new LinkButton();
        btn.ID = "order_button";
        btn.Click += LinkButton1_Click;
        Test1.RegisterAsyncPostBackControl(btn);*/

        LinkButton btn = (LinkButton)e.Item.FindControl("order_button");
        btn.Click += LinkButton1_Click;
        Test1.RegisterAsyncPostBackControl(btn);

            /*AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
            trigger.ControlID = btn.ClientID;
            trigger.EventName = "Click";
            TestUpdate.Triggers.Add(trigger);*/

    }
   protected void LinkButton1_Click(object sender, EventArgs e)
    {
        //string name = ProductName1.Text.ToString();
        //int price = System.Convert.ToInt32(ProductPrice1.ToString(), 10);
        //int number = System.Convert.ToInt32(TextBox1.ToString(),10);
        //orderList.Items.Clear();
        //orderList.Items.Add(new ListItem(name));
        //ListItem product1 = new ListItem();
        //product1.Text = name;
        orderList.Items.Add("test");
    }

我尝试了很多方法,但页面仍在刷新.你有什么建议吗？

Answer 1

Repeater控件的ItemCreated事件内部使用ScriptManager注册该按钮.

//Inside ItemCreatedEvent
ScriptManager scriptMan = ScriptManager.GetCurrent(this);
LinkButton btn = e.Item.FindControl("order_button") as LinkButton;
if(btn != null)
{
    btn.Click += LinkButton1_Click;
    scriptMan.RegisterAsyncPostBackControl(btn);
}

Answer 2

我有类似的问题,但我不想更新整个转发器,只有转发器之外的内容...所以我做的是

1.添加中继器

<asp:Repeater ID="productList" runat="server">
  <!-- my repeater -->
<asp:Repeater>

2.使用可更新内容和触发器添加更新面板

<asp:UpdatePanel ID="up" runat="server">
    <ContentTemplate>
        <!-- when the click on repeater's links, this content will be updated -->
    </ContentTemplate>
    <Triggers>
        <!-- trigger will be the repeater's links/btn that generate postback -->
        <asp:AsyncPostBackTrigger ControlID="productList" />
    </Triggers>
</asp:UpdatePanel>

Answer 3

将以下属性添加到包含转发器和链接按钮的页面指令也将起作用:

<%@ page ClientIDMode="AutoID" %>

我有一个控件需要异步和完全回发,所以使用ScriptManager.RegisterAsyncPostBackControl对我不起作用.通过将控件(包含转发器和链接按钮)封闭在UpdatePanel内部,链接按钮将导致异步回发.如果没有updatepanel,链接按钮将导致完全后备.

希望这有助于其他人.