Jquery 为不同的 node 类型配置jstree右键上下文菜单

The contextmenu plugin already has support for this. From the documentation you linked to:

items: Expects an object or a function, which should return an object. If a function is used it fired in the tree's context and receives one argument - the node that was right clicked.

因此，您可以提供以下函数，而不是让contextmenu使用硬编码对象.它判断在名为"Folder"的类中单击的元素，并通过从对象中删除"delete"菜单项来删除该菜单项:

function customMenu(node) {
    // The default set of all items
    var items = {
        renameItem: { // The "rename" menu item
            label: "Rename",
            action: function () {...}
        },
        deleteItem: { // The "delete" menu item
            label: "Delete",
            action: function () {...}
        }
    };

    if ($(node).hasClass("folder")) {
        // Delete the "delete" menu item
        delete items.deleteItem;
    }

    return items;
}

Note that the above will hide the delete option completely, but the plugin also allows you to show an item while disabling its behaviour, by adding _disabled: true to the relevant item. In this case you can use items.deleteItem._disabled = true within the if statement instead.

应该是显而易见的，但记住使用customMenu函数初始化插件，而不是使用之前的函数:

$("#tree").jstree({plugins: ["contextmenu"], contextmenu: {items: customMenu}});
//                                                                    ^
// ___________________________________________________________________|

Edit:如果您不想在每次右键单击时重新创建菜单，可以将逻辑放入"删除"菜单项本身的操作处理程序中.

"label": "Delete",
"action": function (obj) {
    if ($(this._get_node(obj)).hasClass("folder") return; // cancel action
}

Edit again: After looking at the jsTree source code, it looks like the contextmenu is being re-created every time it is shown anyway (see the show() and parse() functions), so I don't see a problem with my first solution.

However, I do like the notation you are suggesting, with a function as the value for _disabled. A potential path to explore is to wrap their parse() function with your own one that evaluates the function at disabled: function () {...} and stores the result in _disabled, before calling the original parse().

It won't be difficult either to modify their source code directly. Line 2867 of version 1.0-rc1 is the relevant one:

str += "<li class='" + (val._class || "") + (val._disabled ? " jstree-contextmenu-disabled " : "") + "'><ins ";

你可以简单地在这一行前面加一行，判断$.isFunction(val._disabled)，如果是的话，判断val._disabled = val._disabled().然后将其作为补丁提交给创建者:)