Question

I”ve been working at this for a good while now. I’m simply trying to access something that is in a datalist. I can get items just fine from the PageLoad, even set some dynamic items.. but I can’t acess controls from my button click handler.
I’ve tried other variations such as

ListView1.FindControl("DropDownList1") as DropDownList;

Which gives a NULL.
I’ve tried

<asp:LinkButton id="addPro" runat="server" CommandArgument='<%# DropDownList1.SelectedItem.Text %>' onCommand ="addPro_Click">Add To Cart</asp:LinkButton>

Which says it can’t find the data control in scope.

    <asp:ListView ID="ListView1" runat="server" 
        DataKeyNames="Expr7,Expr1,productNo" DataSourceID="SqlDataSource1">
        <AlternatingItemTemplate>
            <span style="">
            <asp:Label ID="productNameLabel" runat="server" 
                Text='<%# Eval("productName") %>' />
            <br />
            <asp:Image runat="server" height = "300" ImageUrl='<%# Eval("img") %>'></asp:Image>
            <br />
            Description:<br />
            <asp:Label ID="itemNotesLabel" runat="server" Text='<%# Eval("itemNotes") %>' />
            <br />

            stock:
            <asp:Label ID="stockLabel" runat="server" Text='<%# Eval("stock") %>' />
            <br />
            price:
            <asp:Label ID="priceLabel" runat="server" Text='<%# "$"+ Eval("price")+".00" %>' />
            <br />

            Quantitiy: <asp:DropDownList id="DropDownList1" runat="server"> </asp:DropDownList>            
            <br />

            <asp:LinkButton id="addPro" runat="server" CommandArgument='<%# Eval("productNo") %>' onCommand ="addPro_Click">Add To Cart</asp:LinkButton>
            <br /><br /><br />
<br /></span>
        </AlternatingItemTemplate>

On click

protected void addPro_Click(Object sender, CommandEventArgs e)
{
    string addr = "";
    string v = Request.QueryString["cat"];
    if (v != null)
    {
        v = "cat=" + v+"&";
    }
    else
    {
        v = "";
    }

    DropDownList stockDD = (DropDownList) FindControl("DropDownList1");
    if (stockDD != null)
        addr = "~/product.aspx/?" + v + "add=" + e.CommandArgument.ToString() + "&quant=" + stockDD.SelectedItem.Text;
    else
        addr = "ERROR!";
    Response.Redirect(addr+e.CommandArgument.ToString());        
    ListView1.ItemDataBound += (sa, ea) =>
        {
            DropDownList stockD = ea.Item.FindControl("DropDownList1") as DropDownList;
            Label l = ea.Item.FindControl("Lable12") as Label;
            l.Text = stockD.SelectedItem.Text;
            addr = "~/product.aspx/?" + v + "add=" + e.CommandArgument.ToString() + "&quant=" + stockD.SelectedItem;

        };
  // Response.Redirect(addr);
}

Any help in the right direction will help a ton! Thanks!

Answer 1

Try this:

LinkButton lbSender = (LinkButton)sender;
ListViewDataItem lvItem = (ListViewDataItem)(lbSender.Parent);
DropDownList DropDownList1 = lvItem.FindControl("DropDownList1");

ListView.Items is a collection of ListViewDataItem which inherits ListViewItem, which inherits from Control. This means you can find any control in its Controls collection using FindControl. You just have to look at the heirarchy.

Docs for ListView: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listview.aspx

Docs for ListViewDataItem: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listviewdataitem.aspx

Docs for ListViewItem: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listviewitem.aspx

Docs for Control: http://msdn.microsoft.com/en-us/library/system.web.ui.control.aspx