how to set_type when loading jstree

Question

how to set_type when loading jstree? I need disable some node after load jstree, and before use it. I defined a new type "disabled", but I dont know how to use it. I have found many solutions and read docs. I still confused. How to set type to the node? why does this not work in my code to call set_type? My source is html_data. can anyone give me some references or advices? thx $("#demo1").jstree({ "checkbox" : {"two_state" : true}, "plugins" : [ "themes", "html_data", "checkbox", "ui" ],

        "types" : {
            "types": {
                "disabled" : { 
                    "check_node" : false, 
                    "uncheck_node" : false,
                    // "select_node" : function () {return false;}
                }
            }
        }

});

$("#demo1").bind("loaded.jstree", function (e, data) {
    $.jstree._reference("#demo1").get_unchecked(0, true).each(function(){
        if($(this).children().length <= 2){
            if("-1" == this.title ) {

                $(this).jstree("set_type", "disabled");
                $.jstree._reference("#demo1").set_type("disabled", "#-1");

            }
        }
     });