Configuring jstree right-click contextmenu for different node types

Question

I've seen an example somewhere online showing how to customise the appearance of jstree's right-click context menu (using contextmenu plugin).

For example, allow my users to delete "documents" but not "folders" (by hiding the "delete" option from the context menu for folders).

Now I can't find that example. Can anyone point me in the right direction? The official documentation didn't really help.

Edit:

Since I want the default context menu with only one or two minor changes, I'd prefer to not recreate the whole menu (though of course I will if it's the only way). What I'd like to do is something like this:

"contextmenu" : {
    items: {
        "ccp" : false,
        "create" : {
            // The item label
            "label" : "Create",
            // The function to execute upon a click
            "action": function (obj) { this.create(obj); },
            "_disabled": function (obj) { 
                alert("obj=" + obj); 
                return "default" != obj.attr('rel'); 
            }
        }
    }
}

but it doesn't work - the create item is just always disabled (the alert never appears).

Answer 1

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.

So rather than give contextmenu a hard-coded object to work with, you can supply the following function. It checks the element that was clicked for a class named "folder", and removes the "delete" menu item by deleting it from the object:

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.

Should be obvious, but remember to initialise the plugin with the customMenu function instead of what you had previously:

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

---

Edit: If you don't want the menu to be recreated on every right-click, you can put the logic in the action handler for the delete menu item itself.

"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 ";

You can simply add a line before this one that checks $.isFunction(val._disabled), and if so, val._disabled = val._disabled(). Then submit it to the creators as a patch :)

Answer 2

Implemented with different node types:

$('#jstree').jstree({
    'contextmenu' : {
        'items' : customMenu
    },
    'plugins' : ['contextmenu', 'types'],
    'types' : {
        '#' : { /* options */ },
        'level_1' : { /* options */ },
        'level_2' : { /* options */ }
        // etc...
    }
});

And the customMenu function:

function customMenu(node)
{
    var items = {
        'item1' : {
            'label' : 'item1',
            'action' : function () { /* action */ }
        },
        'item2' : {
            'label' : 'item2',
            'action' : function () { /* action */ }
        }
    }

    if (node.type === 'level_1') {
        delete items.item2;
    } else if (node.type === 'level_2') {
        delete items.item1;
    }

    return items;
}

Answer 3

To clear everything.

Instead of this:

$("#xxx").jstree({
    'plugins' : 'contextmenu',
    'contextmenu' : {
        'items' : { ... bla bla bla ...}
    }
});

Use this:

$("#xxx").jstree({
    'plugins' : 'contextmenu',
    'contextmenu' : {
        'items' : customMenu
    }
});

Answer 4

I have adapted the suggested solution for working with types a bit differently though, perhaps it can help someone else:

Where #{$id_arr[$k]} is the reference to the div container... in my case I use many trees so all this code will be the output to the browser, but you get the idea.. Basically I want all the context menu options but only 'Create' and 'Paste' on the Drive node. Obviously with the correct bindings to those operations later on:

<div id="$id_arr[$k]" class="jstree_container"></div>
</div>
</li>
<!-- JavaScript neccessary for this tree : {$value} -->
<script type="text/javascript" >
jQuery.noConflict();
jQuery(function ($) {
// This is for the context menu to bind with operations on the right clicked node
function customMenu(node) {
    // The default set of all items
    var control;
    var items = {
        createItem: {
            label: "Create",
            action: function (node) { return { createItem: this.create(node) }; }
        },
        renameItem: {
            label: "Rename",
            action: function (node) { return { renameItem: this.rename(node) }; }
        },
        deleteItem: {
            label: "Delete",
            action: function (node) { return { deleteItem: this.remove(node) }; },
            "separator_after": true
        },
        copyItem: {
            label: "Copy",
            action: function (node) { $(node).addClass("copy"); return { copyItem: this.copy(node) }; }
        },
        cutItem: {
            label: "Cut",
            action: function (node) { $(node).addClass("cut"); return { cutItem: this.cut(node) }; }
        },
        pasteItem: {
            label: "Paste",
            action: function (node) { $(node).addClass("paste"); return { pasteItem: this.paste(node) }; }
        }
    };

    // We go over all the selected items as the context menu only takes action on the one that is right clicked
    $.jstree._reference("#{$id_arr[$k]}").get_selected(false, true).each(function (index, element) {
        if ($(element).attr("id") != $(node).attr("id")) {
            // Let's deselect all nodes that are unrelated to the context menu -- selected but are not the one right clicked
            $("#{$id_arr[$k]}").jstree("deselect_node", '#' + $(element).attr("id"));
        }
    });

    //if any previous click has the class for copy or cut
    $("#{$id_arr[$k]}").find("li").each(function (index, element) {
        if ($(element) != $(node)) {
            if ($(element).hasClass("copy") || $(element).hasClass("cut")) control = 1;
        }
        else if ($(node).hasClass("cut") || $(node).hasClass("copy")) {
            control = 0;
        }
    });

    //only remove the class for cut or copy if the current operation is to paste
    if ($(node).hasClass("paste")) {
        control = 0;
        // Let's loop through all elements and try to find if the paste operation was done already
        $("#{$id_arr[$k]}").find("li").each(function (index, element) {
            if ($(element).hasClass("copy")) $(this).removeClass("copy");
            if ($(element).hasClass("cut")) $(this).removeClass("cut");
            if ($(element).hasClass("paste")) $(this).removeClass("paste");
        });
    }
    switch (control) {
        //Remove the paste item from the context menu
        case 0:
            switch ($(node).attr("rel")) {
                case "drive":
                    delete items.renameItem;
                    delete items.deleteItem;
                    delete items.cutItem;
                    delete items.copyItem;
                    delete items.pasteItem;
                    break;
                case "default":
                    delete items.pasteItem;
                    break;
            }
            break;
            //Remove the paste item from the context menu only on the node that has either copy or cut added class
        case 1:
            if ($(node).hasClass("cut") || $(node).hasClass("copy")) {
                switch ($(node).attr("rel")) {
                    case "drive":
                        delete items.renameItem;
                        delete items.deleteItem;
                        delete items.cutItem;
                        delete items.copyItem;
                        delete items.pasteItem;
                        break;
                    case "default":
                        delete items.pasteItem;
                        break;
                }
            }
            else //Re-enable it on the clicked node that does not have the cut or copy class
            {
                switch ($(node).attr("rel")) {
                    case "drive":
                        delete items.renameItem;
                        delete items.deleteItem;
                        delete items.cutItem;
                        delete items.copyItem;
                        break;
                }
            }
            break;

            //initial state don't show the paste option on any node
        default: switch ($(node).attr("rel")) {
            case "drive":
                delete items.renameItem;
                delete items.deleteItem;
                delete items.cutItem;
                delete items.copyItem;
                delete items.pasteItem;
                break;
            case "default":
                delete items.pasteItem;
                break;
        }
            break;
    }
    return items;
$("#{$id_arr[$k]}").jstree({
  // List of active plugins used
  "plugins" : [ "themes","json_data", "ui", "crrm" , "hotkeys" , "types" , "dnd", "contextmenu"],
  "contextmenu" : { "items" : customMenu  , "select_node": true},