https://snippet.webix.com/sftrq1ot
this sub-items can display, it is no problem。
https://snippet.webix.com/c8kh84ef
this sub-items can not display, it used “webix.DataCollection”
Hello @eric, the menu expects data passed in directly as an array (via data property) or a URL (via url property), and is not meant to work with TreeCollection out of the box. To make it work, you will have to convert your data in a specific way, so that it would contain a menu property , which allows for the navigation menu to work correctly.
Please take a look at the following example: https://snippet.webix.com/9sxvqeis. Also please note that you should be using a TreeCollection in this case, as you are working with the hierarchical data.