While looping API response in accordion menu data missing in Angular4

Question

I am tying to bind the api response (json) in accordion menu ,Here everything is working fine but in accordion I have category,group and subgroup .

In category there is

Answer 1

The problem is that you run *ngFor and set same ids and data-targets. To solve that you can use indexes *ngFor creates in every loop.

To use them you must assign a template expression to HTML attributes. Example:

See the working DEMO here