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OnClientNodeDragStart and alert

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This is a migrated thread and some comments may be shown as answers.

Ben Turpin asked on 26 Aug 2008, 03:02 PM

Hi.

Im trying to deny some operation on the client side through the OnClientNodeDragStart treeview event. If I show a simple alert in the handler the node gets stuck.

    
                    function OnDragStart(sender, args) 
        
                    { 
        
                       alert("hello"); 
        
                    }

    
            <body> 
        
                <form id="form1" runat="server"> 
        
                <telerik:RadScriptManager ID="RadScriptManager1" runat="server"> 
        
                </telerik:RadScriptManager> 
        
                <div> 
        
                    <telerik:RadAjaxManager ID="RadAjaxManager" runat="server"> 
        
                    </telerik:RadAjaxManager> 
        
                    <telerik:RadTreeView ID="RadTreeView" runat="server"  
        
                        LoadingStatusPosition="BeforeNodeText" EnableDragAndDrop="True"  
        
                        onclientnodedragstart="OnDragStart"> 
        
                        <Nodes> 
        
                            <telerik:RadTreeNode runat="server" Expanded="True" ExpandMode="ClientSide"  
        
                                Text="Parent A" Value="a"> 
        
                                <Nodes> 
        
                                    <telerik:RadTreeNode runat="server" ExpandMode="ClientSide" Text="Child A.1"  
        
                                        Value="a1"> 
        
                                    </telerik:RadTreeNode> 
        
                                    <telerik:RadTreeNode runat="server" ExpandMode="ClientSide" Text="Child A.2"  
        
                                        Value="a2"> 
        
                                    </telerik:RadTreeNode> 
        
                                </Nodes> 
        
                            </telerik:RadTreeNode> 
        
                        </Nodes> 
        
            <CollapseAnimation Type="OutQuint" Duration="100"></CollapseAnimation> 
        
            <ExpandAnimation Type="OutQuart" Duration="100"></ExpandAnimation> 
        
                    </telerik:RadTreeView> 
        
                </div> 
        
                </form> 
        
            </body>

Thanks

3 Answers, 1 is accepted

answered on 26 Aug 2008, 05:16 PM

Hi, thanks for the reply.

Well what I want is to dont let the user select nodes from different parents ans show an alert() .
As a first idea, I used the OnClientClicking event and checked if the new selected node is from the same parent as the other selected nodes. But this approach only works when the user releases the mouste button, in other words, the event OnClientClicking only fires just before the release of the mouse button.
So if I select the all the childs nodes and then at last click and drag the parent node it selects the parent node and drags it because the OnClientClicking has not been fired.

Any other option?

Thanks!

answered on 29 Aug 2008, 12:04 PM

Default23.zip

Hello Ben Turpin,

You can still hook on the OnClientNodeDragStart client-side event, but just do not alert. You can have a label below the treeview and mark its text in red if the operation is not supported.

Please find attached a sample page.

Sincerely yours,
Veskoni
the Telerik team

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