ngFor alway returning id of first object in array - angular5

Question

I'm trying to get the ID of an object by assigning it to a variable declared in the component when a button is clicked. However, it seems to only be getting the first objects ID every time.
Here is a link to StackBlitz which replicates the issue I am having:
https://stackblitz.com/edit/angular-vcbzxf
Any assistance would be greatly appreciated.

Answer 1

Update 1 : You can actually achieve what you wanted using bootstrap modal with few changes like below.
comment.component.html:
<div *ngFor="let comment of post.comments; let i = index">
{{ comment.content }}
<button data-toggle="modal" [attr.data-target]="'#confirmDeleteCommentModal' + comment.id">Get ID</button>
<div class="fade modal" [attr.id]="'confirmDeleteCommentModal' + comment.id" tabindex="-1" role="dialog" aria-labelledby="confirmDeleteCommentModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="confirmDeleteCommentModalLabel">Delete Comment</h5>
<button type="button" class="close text-white" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-light" data-dismiss="modal">Cancel</button>
<button type="button" class="btn btn-primary" (click)="checkId(comment.id)">Delete</button>
</div>
</div>
</div>
</div>
</div>
Notice [attr.data-target]="'#confirmDeleteCommentModal' + comment.id" added to Get ID button and [attr.id]="'confirmDeleteCommentModal' + comment.id" which is added to bootstrap modal. Moreover, modal is now included in *ngFor div element.
Previously, data-target of Get ID button was always set to confirmDeleteCommentModal, and we technically just had one bootstrap modal with id set to confirmDeleteCommentModal, I think that is what caused the issue, we always loaded the same (and first) bootstrap modal.
Updated stackblitz: https://stackblitz.com/edit/angular-3tmtwa
Original answer (this did not solve the issue):
If you're going with per your most recent comment (as implemented here - https://stackblitz.com/edit/angular-vcbzxf), I would just like to point out that you could write your comment.component.html as follows:
comment.component.html
<div *ngFor="let comment of post.comments">
<div>
{{showDelete ? 'Are you sure you want to delete?' : comment.content + ' id = ' + comment.id}}
<button *ngIf="showDelete" (click)="showDelete = false">Cancel</button>
<button (click)="(showDelete == false && showDelete = true) || checkId(comment.id)">Delete</button>
</div>
</div>
Stackblitz to give it a quick test : https://stackblitz.com/edit/angular-q27xn7
While this may not be a great improvement over what you've done, thought I would just point out other ways of achieving similar results.