Prevent Dragging Nodes to Root Level
Your project might require you to prevent the TreeView nodes from being dragged to the root level of the tree.
The following example demonstrates how to handle the drag event to achieve this behavior.
<div id="tree"></div>
<script>
$("#tree").kendoTreeView({
dragAndDrop: true,
dataSource: [
{ text: "root 1", expanded: true, items: [
{ text: "bar", expanded: true, items: [
{ text: "baz" },
{ text: "foo" }
] }
] },
{ text: "root 2" }
],
drag: function(e) {
if (e.statusClass == "denied") {
// The TreeView already denies this operation.
return;
} else {
// Whether the action is related to a root node.
var targetsRoot = $(e.dropTarget).parentsUntil(".k-treeview", ".k-item").length == 1;
// If targeting a root node and the operation is not add.
// This means that the operation is to insert before or after the root
// which will create another root.
if (targetsRoot && e.statusClass != "add") {
e.setStatusClass("k-denied");
}
}
}
});
</script>