onContextMenuItemClick

fires when a context menu item has been clicked
void onContextMenuItemClick(id id);
the item id
Example

webix.ui({
    type: "space",
    cols: [
        {
            view: "editor",
            value: "<p>Some text</p>",
            menubar: true,
            contextMenu: [
                {
                    id: "print-selection",
                    value: "Print selection",
                    icon: "rti-print"
                },
                // other context menu options
            ],
            upload: "https://docs.webix.com/editor-backend/images",
            on: {
                onContextMenuItemClick(action) {
                    if (action == "print-selection") {
                        const [start, end] = this.getService(
                            "operations"
                        ).getCursor();
                        if (end) {
                            const s = window.getSelection();
                            const range = s.getRangeAt(0);
                            const clonedSelection = range.cloneContents();
 
                            webix.html.addCss(document.body, "webix_print");
                            const wrap = webix.html.create("div", {
                                class: "webix_ui_print webix_view",
                            });
                            wrap.appendChild(clonedSelection);
                            webix.html.insertBefore(wrap, "", document.body);
 
                            window.print();
 
                            webix.html.remove(wrap);
                            webix.html.removeCss(document.body, "webix_print");
                        }
                    }
                }
            }
        }
    ]
});