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avoid dropping inside tree view
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Marco Teodoro
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Marco Teodoro asked on 09 Jun 2010, 03:11 PM
how can i make tree view undroppable.

i want ti drag from tree view and drop on a specific div, no inside tree view.

best regards

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Alex Gyoshev
Telerik team
answered on 10 Jun 2010, 08:24 AM
Hello Marco Teodoro,

  1. attach an event handler to the nodeDragging event and deny the dragging of nodes over the treeview:
    function onNodeDragging(e) {
        if ($(e.dropTarget).closest('.t-treeview').length > 0)
            e.setStatusClass('t-denied');
    }
  2. prevent the default action of the nodeDrop event and handle the drops onto the div elements, like this:
    function onNodeDrop(e) {
        e.preventDefault();
     
        var dropContainer = $(e.dropTarget).closest('.drop-container');
        var treeview = $('#TreeView').data('tTreeView');
                 
        if (dropContainer.length > 0) {
            $('<div><strong>' + treeview.getItemText(e.item) + '</strong></div>')
                .hide().appendTo(dropContainer).slideDown('fast');
        }
    }

I'm attaching the modified Drag&Drop demo that illustrates the above approach.

Best wishes,
Alex Gyoshev
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Jronny
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answered on 27 Aug 2010, 04:03 AM
Will this functionality be added to the next release?
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Jon
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answered on 23 Nov 2010, 10:10 PM
Should the following show the red circle with a line through it when dragging over the treeview control?
function onNodeDragging(e) {
    if ($(e.dropTarget).closest('.t-treeview').length > 0)
        e.setStatusClass('t-denied');
}
I'm using the Extensions for ASP.NET MVC Q3 2010 Live Examples (Win7, IE8 and FF3.6) with your attached drag-n-drop sample and I get the plus and insert inbetween icons when dragging over the treeview control.

It seems that the onNodeDragging function never gets called. If I insert an alert("hi"); before the if statement, I don't see the popup.

It does prevent dropping the node anywhere on the tree.

Thanks.
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Marco Teodoro
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Answers by
Alex Gyoshev
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Jronny
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Jon
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