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Rank: Member
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Joined: 10/15/2007
Posts: 23
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Is there any way that a server-side event can be called when a TreeView's checkbox is checked or unchecked? Right now, I seem to only be able to call an event when the node's item itself is clicked. So that obviously means that the checkbox is seperate from the node itself, correct?
Regards,
David
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
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Hi David,
Unfortunately no. Click on the check box are node are handled separately. While you can set clicking a node to trigger a server side event, currently there is no way to set clicking on the checkbox to trigger any event. Sorry about that!
Thanks
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Rank: Member
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Joined: 10/15/2007
Posts: 23
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So then, at what point can I tell which nodes have their checkboxes checked? I don't seem to be able to tell at postback or callback. That is, it always shows the state as being unchecked.
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
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You can get the value when the page postback. Try the following steps: 1. Place a TreeView in the form; 2. Place a Button in the form; 3. Inside the button's Click handler, check the value of TreeView1.Nodes[0].Checked; 4. Run the page and check the first node of the TreeView, then click the button to postback the page; You can also check the value on the client side with JavaScript through this function: http://www.essentialobjects.com/ViewDoc.aspx?t=JSDoc.Public.TreeNode.getCheckState.htmlThanks
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Rank: Member
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Joined: 10/15/2007
Posts: 23
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Here is the code that I have and it always seems to show the checkstate as unchecked even the box is checked. This code is placed in the form's submit button click handler:
Code: Visual Basic.NET
For Each node As EO.Web.TreeNode In TreeView1.Nodes
Select Case node.CheckState
Case EO.Web.CheckState.Checked
blah blah blah
Case EO.Web.CheckState.Indeterminate
blah blah blah
Case EO.Web.CheckState.Unchecked
blah blah blah
End Select
Next
Any thoughts?
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Rank: Administration
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Joined: 5/27/2007
Posts: 24,194
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Hi David,
Can you try the steps that we posted in our previous post and let us know what happens? Make sure you are running the latest version when you try that.
Thanks
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Rank: Member
Groups: Member
Joined: 10/15/2007
Posts: 23
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Nope, I tried the simple steps you listed above and I still get TreeView1.Nodes(0).Checked=False. Here is the HTML:
Code: HTML/ASPX
<eo:TreeView ID="TreeView1" runat="server" ControlSkinID="None" AutoCheckChildren="True" AutoCheckParent="True" AutoUncheckChildren="True">
<TopGroup Style-CssText="cursor:hand; font-family:Tahoma; font-size:9pt; color:Black; padding-right: 5px; padding-left: 5px; padding-bottom: 5px; padding-top: 5px">
</TopGroup>
<LineImages Visible="False" />
<LookNodes>
<eo:TreeNode CollapsedImageUrl="00030501" ExpandedImageUrl="00030502" ImageUrl="00030503" ItemID="_Default" NormalStyle-CssText="padding-right: 3px; padding-left: 3px; padding-bottom: 1px; padding-top: 1px" SelectedStyle-CssText="border-right: #8396c3 1px solid; padding-right: 2px; border-top: #8396c3 1px solid; padding-left: 2px; padding-bottom: 0px; border-left: #8396c3 1px solid; padding-top: 0px; border-bottom: #8396c3 1px solid; background-color: #f2f5fb">
<SubGroup ItemSpacing="4">
</SubGroup>
</eo:TreeNode>
</LookNodes>
</eo:TreeView>
One more thing I forgot to mention is that I have a TreeView1.ItemPopulate event that loads child nodes under each parent node. Would that cause this issue? By the way, on an entirely different note, how do I know if I have the latest version of the controls? That is, the download page says the current version is "2007.2.34" but the DLL version says "5.0.35.2".
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
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Hi, It appears that you are dynamically generating the nodes (because your TreeView has no nodes defined), when that is the case, everything is wiped out when you generates the nodes (typically by calling DataBind) again. For example, if you always call DataBind in your Page_Load, whatever changes you made on the client side is instantly gone, because you just told the TreeView to populate from the data source again. The same can occur when you generates nodes from code. In order to avoid this problem, you should populate from the data source only once. This is typically done by:
Code: Visual Basic.NET
If Not Page.IsPostBack Then 'Without this if everything will be wipped out
'prepare the data source.....
TreeView1.DataBind
End If
As for the version number, 2007.2 = 5.0. So you actually have 2007.2.35.2, which is one version ahead because our website was not updated (it is updated now). The last version number ".2" means its for ASP.NET 2.0. Thanks
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Rank: Member
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Joined: 10/15/2007
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That did it. Thanks for your guidance!  Meanwhile, I'd like to recommend a server-side event for the checkbox in a future release. 
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Rank: Administration
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Joined: 5/27/2007
Posts: 24,194
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Thanks for the suggestion. We will keep that in mind!
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