Data View Lazy Loading

Hi,

I am trying to implement lazy loading for data view in angualr4 by following the webix samples. I configured the related properties datafetch and url but when I scroll the dataview lazy loading is not working. The request to get the next set of records is not happening. I tried with onDataRequest event as well. I am using java spring rest service to get the data. Please find the below code sinppet url :
https://webix.com/snippet/5fe746aa
Is there any other configuration which I need to provide?

Check

https://snippet.webix.com/b9app5fg

Be sure that the initial data load returns json with total_count property, like here
https://docs.webix.com/samples/06_dataview/16_dyn_loading/data/data_dyn.php

Without such property, the component will not know that there is an extra data and will not issue the auto-loading request.