获取回复的评论信息
有人会说获取回复的评论信息，这不简单么？加个 click 事件不就行了。还记得上一篇文章咱们是如何实现梯形展示评论的么？咱们是通过递归来实现的，怎么添加 click 事件让一个不知道嵌了多少层的组件能够把评论信息传给父组件？首先不具体想怎么实现，我们这个思路是不是对的：把子组件的信息传给父组件？答案是肯定的，我们就是要把不管嵌了多少层的子组件的信息传给 comment.component.ts 这个评论模块的主组件。
Angular 提供了 @Output 来实现子组件向父组件传递信息，我们在 comment-view.component.ts 模块中添加 @Output 向每个调用它的父组件传信息，我们是嵌套的，这样一层一层传出来，直到传给 comment-component.ts 组件。我们看代码怎么实现。
实现代码
comment-view.component.ts
@Component({
selector: 'comment-view',
templateUrl: './comment-view.component.html',
styleUrls: ['./comment-view.component.css']
})
export class CommentViewComponent implements OnInit {
@Input()
public comments: Comment[];
// 点击回复时返回数据
@Output()
public contentEvent: EventEmitter<Comment> = new EventEmitter<Comment>();
// 用于跳转到回复输入框的url拼接
public url: string = "";
constructor(private router: Router,
private activateRoute: ActivatedRoute ) {
}
ngOnInit(): void {
this.url = this.router.url;
this.url = this.url.split("#")[0];
this.url = this.url + "#comment";
}
reply(comment: Comment) {
this.contentEvent.emit(comment);
}
transferToParent(event) {
this.contentEvent.emit(event);
}
}
comment-view.component.html
<div *ngFor="let comment of comments">
<div class="media">
<div class="pull-left">
<span class="media-object"></span>
</div>
<div class="media-body">
<h4 class="media-heading">{{ comment.username }}
<small class="pull-right">{{ comment.time }} | <a href="{{url}}" rel="external nofollow" rel="external nofollow" (click)="reply(comment)" >{{ 'comment.reply' | translate }}</a></small>
</h4>
{{ comment.content }}
<hr>
<comment-view *ngIf="comment.cComments != null" [comments]="comment.cComments" (contentEvent)="transferToParent($event)"></comment-view>
</div>
</div>
</div>
comment.component.ts
@Component({
selector: 'comment',
templateUrl: './comment.component.html',
styleUrls: ['./comment.component.css']
})
export class CommentComponent implements OnInit {
@Input()
public comments: Comment[];
// 要回复的评论
public replyComment: Comment = new Comment();
public id: number = 0;
public content: string = "";
ngOnInit(): void {
}
getReplyComment(event) {
this.replyComment = event;
this.id = this.replyComment.id;
this.content = "[reply]" + this.replyComment.username + "[reply]\n";
}
}
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