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Using RadTreeNode Methods Against а Group of Nodes

To run RadTreeNode methods against every node in a group, iterate the RadTreeNodeCollection and call the method for every RadTreeNode instance. For example, to check all nodes in a tree the RadTreeView get_allNodes() method returns the collection of all nodes, the nodes are iterated and set_checked(true) is called for every node instance. This same general pattern can be followed for all kinds of operations against collections of nodes.

function CheckAll() {
    var tree = $find("RadTreeView1");
    var nodes = tree.get_allNodes();
    for (var i = 0; i < nodes.length; i++) {

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