Change

<div id="treeList"></div>
<script>
  $("#treeList").kendoTreeList({
    columns: [
      { field: "id" },
      { field: "name" },
      { field: "age" }
    ],
    dataSource: [
      { id: 1, parentId: null, name: "Jane Doe", age: 22, expanded: true },
      { id: 2, parentId: 1, name: "John Doe", age: 24 },
      { id: 3, parentId: 1, name: "Jenny Doe", age: 3 }
    ],
    selectable: "multiple, row",
    change: function(e) {
      var selectedRows = this.select();
      var selectedDataItems = [];
      for (var i = 0; i < selectedRows.length; i++) {
        var dataItem = this.dataItem(selectedRows[i]);
        selectedDataItems.push(dataItem);
      }
      // selectedDataItems contains all selected data items
/* The result can be observed in the DevTools(F12) console of the browser. */
      console.log(selectedDataItems.length);
    }
  });
</script>

<div id="treeList"></div>
<script>
  function change(e) {
    var selectedCells = this.select();
    var selectedDataItems = [];
    for (var i = 0; i < selectedCells.length; i++) {
      var dataItem = this.dataItem(selectedCells[i].parentNode);
      if ($.inArray(dataItem, selectedDataItems) < 0) {
        selectedDataItems.push(dataItem);
      }
    }
    // selectedDataItems contains all selected data items
/* The result can be observed in the DevTools(F12) console of the browser. */
    console.log(selectedDataItems.length + " data items selected.");
  }
  $("#treeList").kendoTreeList({
    columns: [
      { field: "id" },
      { field: "name" },
      { field: "age" }
    ],
    dataSource: [
      { id: 1, parentId: null, name: "Jane Doe", age: 22, expanded: true },
      { id: 2, parentId: 1, name: "John Doe", age: 24 },
      { id: 3, parentId: 1, name: "Jenny Doe", age: 3 }
    ],
    selectable: "multiple, cell"
  });
  var treeList = $("#treeList").data("kendoTreeList");
  treeList.bind("change", change);
</script>