openTodoDialog_todo-list.component.ts

openTodoDialog(mode: string, todo?: TODO): void { // mode = 'create' | 'update'
    const dialogRef = this.dialog.open(TodoDialog, {
      width: '800px',
      data: { mode: mode, todos: todo ? [todo] : [] }
    });
    dialogRef.afterClosed().subscribe((result: TODO[]) => {
      if (result) {
        this.todoService.updateTodoList(result, mode);
      }
    });
  }