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POAccessing Controls on ListView Edit Command
 

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  1. POAccessing Controls on ListView Edit Command
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    <p>In my <code>ListView</code> I have an <code>ItemTemplate</code> and <code>EditItemTemplate</code> which look something like this, respectively.</p> <p><img src="https://i.stack.imgur.com/hew0h.png" alt="enter image description here"> -------> <img src="https://i.stack.imgur.com/FkNdq.png" alt="enter image description here"></p> <p>When I click the "Edit" button, and it switches to the <code>EditItemTemplate</code> view on the right, I want to prefill the <code>Textbox</code> and select the corresponding <code>option</code> in the <code>DropDownList</code>. How can I do this?</p> <p>Before you say to use something like the following, please know that I've already explored every possible variation I can think of. Sorry to be so demanding, but please be prepared to walk me through this one if you answer. ^.^ I've been stuck on this issue for literally months :(</p> <pre class="lang-vb prettyprint-override"><code>Dim lv As ListView = DirectCast(sender, ListView) 'sender is the ListView on the ItemCommand event Dim ddl As DropDownList = DirectCast(lv.Items(0).FindControl("NewProductName_ddl"), DropDownList) Dim tb As TextBox = DirectCast(lv.Items(0).FindControl("NewProductName_tb"), TextBox) </code></pre> <p><strong>UPDATE - RAWR!!</strong></p> <p>Oh my freaking goodness, SO CLOSE, but no cigar. The following code worked for prefilling when only one item was in the ListView, but when more than one items exist, it throws a <em>NullReferenceException</em> :(</p> <pre class="lang-vb prettyprint-override"><code>'PROBLEM WAS HERE: Compare to the working code in my answer. Protected Sub NewProduct_ItemDataBound(ByVal sender As ListView, ByVal e As ListViewItemEventArgs) Handles NewProduct.ItemDataBound If sender.EditIndex &gt; -1 Then Dim ddl As DropDownList = DirectCast(e.Item.FindControl("NewProductName_ddl"), DropDownList) Dim tb As TextBox = DirectCast(e.Item.FindControl("NewProductName_cb"), TextBox) ddl.Items.FindByValue(sender.DataKeys(sender.EditIndex)("ID").ToString).Selected = True 'Prefills the DropDownList tb.Text = sender.DataKeys(sender.EditIndex)("Product").ToString 'Prefills the TextBox End If End Sub </code></pre>
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    1. USChiramisu
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    1. COHave you looked here http://stackoverflow.com/questions/825048/accessing-controls-in-the-edititemtemplate-of-a-listview. Which event are you trying to access the control in?
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      1. USPaul McCowat
    2. CO@PaulMcCowat Yes, and I'm looking at it more closely now, but I'm still having trouble connecting the dots. How do I "tell" the ItemDataBound DropDownList that the SelectedValue should the one from the ItemCommand event? i.e. How do I pass that data between event? Or am I thinking about it wrong? See how confused I am? :'(
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      1. USChiramisu
    3. COIt looks like you are finding the `NewProductName_ddl` as if it's one instance. That's probably going to return a collection of DropDownLists. It's really hard to help you and write the code without having the full html and code behind available.
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      1. USThe Muffin Man
 

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