ngFor - Can't bind to 'testid' since it isn't a known property of 'input'. how to concat id with string?
问题 I am trying to add the index value with my ids. but getting an error as: Can't bind to 'testid' since it isn't a known property of 'input'. here is my template: <td *ngFor="let col of columns; let i = index" [ngClass]="col.class" data-testid="form-create-td-{{i}}"> what is wrong with my code? any one help me? 回答1: I think you will need property binding. So please try to replace below testid data property. <td ... [attr.data-testid]="'form-create-td-' + i"> For concatenation id property with