ListViewItem中的DropDownList [英] DropDownList inside ListViewItem

问题描述

问题

我遇到问题 DropDownList 控制 ListView - 当 DropDownList的选定索引被更改， ListViewItem 的 OnItemCommand 事件未被触发。



我不确定我是否正确配置控件，所以任何建议都会受到赞赏。



< b>更多细节

我在 ItemTemplate DropDownList c $ c>用于 ListView ，在我的aspx中定义。



当用户选择不同的索引时 DropDownList ，我想执行回发并捕获新选择的 DropDownList 索引，以及 ListViewItem 包含所说的 DropDownList 。



为实现这一目标，我我设置的 AutoPostBack 属性 DropDownList 改为true并尝试在 OnItemCommand中捕获 ListViewItem ListView的命令。



调试显示回发正在发生，但 OnItemCommand 事件没有被触发。



也许值得注意的是我不添加 DropDownList 到服务器上的ItemCreated事件中的 ListView 控件，因为这会导致 DropDownList 到在 ListViewItem 之外渲染，并没有改善问题。我只能假设我这样做是错误的，或者有一些我忽略的东西。



请有人建议吗？



谢谢

Hi,

Problem
I have a problem using a DropDownList control inside a ListView - when the selected index of the DropDownList is changed, the OnItemCommand event of the ListViewItem isn't being fired.

I'm not sure whether I'm configuring the controls correctly, so any advice would be appreciated.

More detail
I have a DropDownList inside of an ItemTemplate for a ListView, defined in my aspx.

When the user selects a different index in the DropDownList, I want to perform a postback and capture the newly chosen DropDownList index, as well as the ListViewItem that contains said DropDownList.

To achieve this, I am setting the AutoPostBack property of the DropDownList to "true" and am trying to capture the ListViewItem in the OnItemCommand command of the ListView.

Debugging reveals that the postback is occuring, but the OnItemCommand event isn't being triggered.

It might also be worth noting that I am NOT adding the DropDownList to the ListView controls in the ItemCreated event on the server, as this causes the DropDownList to render outside of the ListViewItem and doesn't improve the problem. I can only assume I am doing this the wrong way, or there is something I'm overlooking.

Please can anyone advise?

Thanks

推荐答案

抓住 ListView ItemDataBound



Plesae不要复制粘贴，试着理解。



example.aspx

Catch it on ListView ItemDataBound

Plesae dont copy and paste, try to understand.

example.aspx

<asp:listview id="ListView1" runat="server" onitemdatabound="ListView1_ItemDataBound" xmlns:asp="#unknown">
        DataSourceID="SqlDataSource1" ItemPlaceholderID="SqlItemContainer" DataKeyNames="cid"&gt;
.......................
 <itemtemplate>
            <asp:dropdownlist id="ddl" runat="server" autopostback="true" onselectedindexchanged="ddl_SelectedIndexChanged">
                <asp:listitem text="Select 1" value="One" selected="True">Review</asp:listitem>
                <asp:listitem text="Select 2" value="Two">Send Back to Level1</asp:listitem>
            </asp:dropdownlist>
        </itemtemplate>
<asp:label id="ddlval" text="" runat="server"></asp:label&gt;

....... ....................



example.cs

...........................

example.cs

protected void ddl_SelectedIndexChanged(object sender, EventArgs e)
    {
        ddlval.Text = ((DropDownList)sender).SelectedValue;
    }
    protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
    {
        if (Page.IsPostBack)
        {
            if (e.Item.ItemType == ListViewItemType.DataItem)
            {
                DropDownList ddl = e.Item.FindControl("ddl") as DropDownList;
                ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);

            }
        }

你应该抓住SelectedIndexChanging [ ^ ]或SelectedIndexChanged [ ^ ]事件。

You should rather capture SelectedIndexChanging [^]or SelectedIndexChanged [^]event.

protected void dropdownlist1_SelectedIndexChanged(object sender, EventArgs e)
   {
       DropDownList ddlListFind = (DropDownList)sender;
       ListViewItem item1 = (ListViewItem)ddlListFind.NamingContainer;
       DropDownList getDDLList = (DropDownList)item1.FindControl("dropdownlist1");

       Label lblMessage = (Label)item1.FindControl("lblMsg");
       lblMessage.Visible = true; lblMessage.Text = "dropDown text is : " + getDDLList.SelectedItem.Text + " and value is : " + getDDLList.SelectedItem.Value;
   }

这篇关于ListViewItem中的DropDownList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！