DropDownList inside ListViewItem

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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

Posted 8-Feb-11 5:16am

anthasaurus

Updated 24-May-19 0:29am

Abhishek Sur

v2

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Monjurul Habib · Answer 1 · 2011-02-08T09:42:00

Catch it on ListView ItemDataBound

Plesae dont copy and paste, try to understand.

example.aspx

XML

<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

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);

            }
        }

Manas Bhardwaj · Answer 2 · 2011-02-08T05:20:00

Solution 1

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

Posted 8-Feb-11 5:20am

Manas Bhardwaj

Comments

anthasaurus 8-Feb-11 11:36am

Thanks for your reply Manas,

I'm not convinced that would be the way to do it - how would one go about obtaining the DataItem for the ListViewItem that the DropDownList belongs to?

The SelectedIndexChanging/Changed server event only passes 'EventArgs' as a parameter back to the server, but the DataItem of the ListView cannot be obtained from this.

JIYAUL MUSTAPHA · Answer 3 · 2019-05-24T00:30:00

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;
   }

DropDownList inside ListViewItem

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