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POHow to Edit data in nested Listview
 

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  1. POHow to Edit data in nested Listview
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    <p>I am using listview to display a list of items and a nested listview to show list of features to each item. Both parent and child listview need to able Insert,Edit and delete operation. It works fine for parent listview. But when I try to edit an child item, The edit button does not take it into Edit mode. Can you please suggest me what I am missing in my code?</p> <pre><code>&lt;asp:ListView ID="lvParent" runat="server" OnItemDataBound="lvParent_ItemDataBound" onitemcanceling="lvParent_ItemCanceling" onitemcommand="lvParent_ItemCommand" DataKeyNames="ItemID" onitemdeleting="lvParent_ItemDeleting" oniteminserting="lvParent_ItemInserting" &gt; &lt;LayoutTemplate&gt; &lt;asp:PlaceHolder ID="itemPlaceholder" runat="server"&gt;&lt;/asp:PlaceHolder&gt; &lt;div align="right"&gt; &lt;asp:Button ID="btnInsert" runat="server" Text="ADD Item" onclick="btnInsert_Click"/&gt; &lt;/div&gt; &lt;/LayoutTemplate&gt; &lt;ItemTemplate&gt; &lt;table runat="server" cellpadding="0" cellspacing="0" border="0" width="100%"&gt; &lt;tr&gt; &lt;td&gt; &lt;div id="dvDetail"&gt; &lt;span &gt;Description&lt;/span&gt; &lt;asp:TextBox ID="txtDescription" runat="server" Text='&lt;%# DataBinder.Eval(Container.DataItem, "Description") %&gt;' TextMode="MultiLine" &gt;&lt;/asp:TextBox&gt; &lt;/div&gt; &lt;div id="dvFeature" &gt; &lt;span&gt;Feature List&lt;/span&gt; &lt;asp:ListView ID="lvChild" runat="server" InsertItemPosition="LastItem" DataKeyNames="FeatureID" OnItemCommand="lvChild_ItemCommand" OnItemCanceling="lvChild_ItemCanceling" OnItemDeleting="lvChild_ItemDeleting" OnItemEditing="lvChild_ItemEditing" OnItemInserting="lvChild_ItemInserting" OnItemUpdating="lvChild_ItemUpdating" DataSource='&lt;%# DataBinder.Eval(Container.DataItem, "FeatureList") %&gt;' &gt; &lt;LayoutTemplate&gt; &lt;ul &gt; &lt;asp:PlaceHolder runat="server" ID="itemPlaceHolder" &gt;&lt;/asp:PlaceHolder&gt; &lt;/ul&gt; &lt;/LayoutTemplate&gt; &lt;ItemTemplate&gt; &lt;li&gt; &lt;span class="dvList"&gt;&lt;%# DataBinder.Eval(Container.DataItem, "FeatureTitle")%&gt;&lt;/span&gt; &lt;div class="dvButton" &gt; &lt;asp:ImageButton ID="btnEdit" runat="server" ImageUrl="/Images/edit_16x16.gif" AlternateText= "Edit" CommandName="Edit" CommandArgument='&lt;%# DataBinder.Eval(Container.DataItem, "FeatureID") %&gt;' Width="12" Height="12" /&gt; &lt;asp:ImageButton ID="btnDelete" runat="server" ImageUrl="/Images/delete_16x16.gif" AlternateText= "Delete" CommandName="Delete" CommandArgument='&lt;%# DataBinder.Eval(Container.DataItem, "FeatureID") %&gt;' Width="12" Height="12" /&gt; &lt;/div&gt; &lt;/li&gt; &lt;/ItemTemplate&gt; &lt;EditItemTemplate&gt; &lt;li&gt; &lt;asp:TextBox ID="txtFeature" Text='&lt;%# DataBinder.Eval(Container.DataItem, "FeatureTitle")%&gt;' runat="server"&gt;&lt;/asp:TextBox&gt; &lt;div class="dvButton"&gt; &lt;asp:ImageButton ID="btnUpdate" runat="server" ImageUrl="/Images/ok_16x16.gif" AlternateText= "Update" CommandName="Update" CommandArgument='&lt;%# DataBinder.Eval(Container.DataItem, "FeatureID") %&gt;' Width="12" Height="12" /&gt; &lt;asp:ImageButton ID="btnCancel" runat="server" ImageUrl="/Images/delete_16x16.gif" AlternateText= "Cancel" CommandName="Cancel" Width="12" Height="12" CausesValidation="false" /&gt; &lt;/div&gt; &lt;/li&gt; &lt;/EditItemTemplate&gt; &lt;InsertItemTemplate&gt; &lt;asp:TextBox ID="txtFeature" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;div class="dvButton"&gt; &lt;asp:ImageButton ID="btnInsert" runat="server" ImageUrl="/Images/ok_16x16.gif" AlternateText= "Insert" CommandName="Insert" Width="12" Height="12" /&gt; &lt;asp:ImageButton ID="btnCancel" runat="server" ImageUrl="/Images/delete_16x16.gif" AlternateText= "Cancel" CommandName="Cancel" Width="12" Height="12" CausesValidation="false" /&gt; &lt;/div&gt; &lt;/InsertItemTemplate&gt; &lt;/asp:ListView&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td align="right"&gt; &lt;div id="dvButton" &gt; &lt;asp:Button ID="btnSave" runat="server" Text="Save" CommandName="Save" CommandArgument='&lt;%# DataBinder.Eval(Container.DataItem, "ItemID") %&gt;' /&gt; &lt;asp:Button ID="btnDelete" runat="server" Text="Delete" CssClass="Cancel" CommandName="Delete" CommandArgument='&lt;%# DataBinder.Eval(Container.DataItem, "ItemID") %&gt;' /&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/ItemTemplate&gt; &lt;/asp:ListView&gt; </code></pre> <p>Code Behind:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack == false) { BindData(); } } private void BindData() { MyDataContext data = new MyDataContext(); var result = from itm in data.ItemLists where itm.ItemID == iItemID select new { itm.ItemID, itm.Description, FeatureList = itm.Features }; lvParent.DataSource = result; lvParent.DataBind(); } protected void lvChild_ItemEditing(object sender, ListViewEditEventArgs e) { ListView lvChild = sender as ListView; lvChild.EditIndex = e.NewEditIndex; lvChild.DataBind(); } </code></pre> <p>Edit:</p> <pre><code>protected void lvChild_ItemEditing(object sender, ListViewEditEventArgs e) { ListView lvChild = sender as ListView; lvChild.EditIndex = e.NewEditIndex; lvChild.DataBind(); } </code></pre> <p>If I use "lvChild.DataBind()" in 'ItemEditing' event, the total list of child items goes away if I click 'edit'</p> <pre><code>protected void lvChild_ItemEditing(object sender, ListViewEditEventArgs e) { ListView lvChild = sender as ListView; lvChild.EditIndex = e.NewEditIndex; } </code></pre> <p>if I get rid of 'lvChild.Databind' in ItemEditing event, it goes to Edit mode after clicking the 'edit' button twice . And though it shows textbox control of EditItemTemplate, it appears as a blank textbox (does not bind existing value to edit).</p>
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