How to set dynamic id in *ngFor?

This also will work:

<div class = "CirclePoint" *ngFor="let c of circles">
   <div [id]="c.id"></div>
</div>

If you want to add a prefix, say "loc";

<div class = "CirclePoint" *ngFor="let c of circles">
   <div [id]="'loc' + c.id"></div>
</div>

Using [] helps to add values dynamically.

Try this:

 <div class = "CirclePoint" *ngFor="let c of circles">
     <div id="location_{{c.id}}">write something which you want like c.x </div>
 </div>`

Hopefully this will work for you. I searched StackOverflow and I found this answer.

<div class = "CirclePoint" *ngFor="let c of circles" 
    [attr.id]="'Location' + c.id">
</div>

<div class = "CirclePoint" *ngFor="let c of circles" 
    attr.id="Location{{c.id}}">
</div>