jsTree custom contextmenu not filtering based on type folder/file

Question

I am trying to configure a custom context menu for jsTree. I want files to have two options [Rename, Delete] and I want folders to have one option [Create]

The below code seems correct as described here: Configuring jstree right-click contextmenu for different node types

However this does not seem to work, there are two problems.

1. Both context menus display the options [Rename, Delete]
2. Choosing either option causes the error: Uncaught TypeError: undefined is not a function

What am I doing wrong? Edit: here is a fiddle

$( document ).ready(function() {
    function customMenu(node) {
        // The default set of all items
        var items = {
            createItem: { // The "create" menu item
                label: "Create",
                action: function () {
                    this.create(node);
                }
            },
            renameItem: { // The "rename" menu item
                label: "Rename",
                action: function () {
                    this.rename(node);
                }
            },
            deleteItem: { // The "delete" menu item
                label: "Delete",
                action: function () {
                    this.remove(node);
                }
            }
        };

        if ($(node).hasClass("folder") || $(node).hasClass("jstree-closed") || $(node).hasClass("jstree-open")) {
            delete items.deleteItem;
            delete items.renameItem;
        }

        else{
            delete items.createItem;
        }

        return items;
    }

    $('#tree').jstree({
        'core': {
            'data': [
                { "id": "ajson1", "parent": "#", "text": "Folder 1" },
                { "id": "ajson2", "parent": "ajson1", "text": "File 1" },
                { "id": "ajson3", "parent": "ajson1", "text": "File 2" }
            ]
        },
        "plugins": [ "contextmenu" ],
        "contextmenu": {items: customMenu}
    });
});

Answer 1

Okay so the answer is that jstree does not implicitly distinguish between files and folders. If you want to make the distinction you need to add an identifier and custom logic.

To accomplish this I added the following to each of my data objects.

"data" : { "file" : true }

The custom logic then became

if (node.data.file) {
    delete items.createItem;
}

else{
    delete items.deleteItem;
    delete items.renameItem;
}

Furthermore, the manner in which I was implementing custom actions was wrong. I figured this out by looking at the source of jstree (jstree/src/jstree.contextmenu.js). To enable create and delete you must set 'check_callback': true. Then you can for example implement the create action as follows.

createItem: { // The "create" menu item
                        label: "Create",
                        action: function (data) {
                            var inst = $.jstree.reference(data.reference),
                                    obj = inst.get_node(data.reference);
                            inst.create_node(obj, {}, "last", function (new_node) {
                                new_node.data = {file: true};
                                setTimeout(function () { inst.edit(new_node); },0);
                            });
                        }
                    },

Full working jsfiddle here.