modal.ts

 <ng-template #content let-c="close" let-d="dismiss">
      <div class="modal-header">
        <h4 class="modal-title">Modal title</h4>
        <button type="button" class="close" aria-label="Close" (click)="d('Cross click')">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        <p>One fine body&hellip;</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" (click)="c('Close click')">Close</button>
      </div>
    </ng-template>

    <button class="btn btn-lg btn-outline-primary" (click)="open(content)">Launch demo modal</button>



 closeResult: string;
    open(content) {
       this.modalService.open(content).result.then((result) => {
         this.closeResult = Closed with: result;
       }, (reason) => {
         this.closeResult = Dismissed reason;
       });
     }

     private getDismissReason(reason: any): string {
       console.log(reason)
       if (reason === ModalDismissReasons.ESC) {
         return 'by pressing ESC';
       } else if (reason === ModalDismissReasons.BACKDROP_CLICK) {
         return 'by clicking on a backdrop';
       } else {
         return  'reason';
       }
     }
    constructor(private modalService: NgbModal){

    }