$("#tree").fancytree({
    checkbox: true,
    selectMode: 3,
    source: {
      url:
        "https://cdn.rawgit.com/mar10/fancytree/72e03685/demo/ajax-tree-products.json"
    },
    lazyLoad: function(event, data) {
      data.result = {url: "https://cdn.rawgit.com/mar10/fancytree/72e03685/demo/ajax-sub2.json"};
    },
  
    activate: function(event, data) {
      $("#statusLine").text(event.type + ": " + data.node);
    },
    select: function(event, data) {
      $("#statusLine").text(
        event.type + ": " + data.node.isSelected() + " " + data.node
      );
    }
  });
  
  // Sample button
  $("#button1").click(function() {
    var tree = $.ui.fancytree.getTree(),
      node = tree.findFirst(function(n) {
        return n.title === "The Hobbit";
      });
  
    node.toggleSelected();
  });