Angular中组件间通讯的实现方法
这篇文章主要介绍Angular中组件间通讯的实现方法,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
Angular 组件间的通讯
组件间三种典型关系:
父好组件之间的交互(@Input/@Output/模板变量/@ViewChild)
非父子组件之间的交互(Service/localStorage)
还可以可以利用 Session、 路由参数来进行通讯等
相关教程推荐:《angular教程》
父子组件之间交互
子组件编写
child.component.ts
@Component({ selector: 'app-child', templateUrl: './child.component.html', styleUrls: ['./child.component.css']})export class ChildComponent implements OnInit { private _childTitle = '我是子组件'; @Input() set childTitle(childTitle: string) { this._childTitle = childTitle; } get childTitle(): string { return this._childTitle; } @Output() messageEvent: EventEmitter<string> = new EventEmitter<string>(); constructor() { } ngOnInit(): void { } sendMessage(): void { this.messageEvent.emit('我是子组件'); } childFunction(): void { console.log('子组件的名字是:' + this.childTitle); }}
child.component.html
<div class="panel panel-primary"> <div class="panel-heading">{{childTitle}}</div> <div class="panel-body"> <button (click)="sendMessage()" class="btn btn-success">给父组件发消息</button> </div></div>
父组件
parent-and-child.component.ts
@Component({ selector: 'app-parent-and-child', templateUrl: './parent-and-child.component.html', styleUrls: ['./parent-and-child.component.css']})export class ParentAndChildComponent implements OnInit { constructor() { } ngOnInit(): void { } doSomething(event: any): void { alert(event); }}
parent-and-child.component.html
<div class="panel panel-primary"> <div class="panel-heading">父组件</div> <div class="panel-body"> <app-child #child (messageEvent) = "doSomething($event)"></app-child> <button (click)="child.childFunction()" class="btn btn-success">调用子组件的方法</button> </div></div>
@Input 属性绑定是单向的,父组件的属性变化会影响子组件的属性变化, 子组件的属性变化不会反过来影响父组件的的属性变化。
不过,可以利用 @Input() 和 @Output() 实现属性的双向绑定。
@Input()value: string;@Output()valueChange: EventEmitter<any> = new EventEmitter();// 实现双向绑定<input [(value)] = "newValue"></input>
注意: 使用 [()]
进行双向绑定时,输出属性名必须是输入属性名与 Change 组成, 形如: xxxChange。
非父子组件之间交互
使用 Service 进行交互
event-bus.service.ts
@Injectable()export class EventBusService { evnetBus: Subject<string> = new Subject<string>(); constructor() { }}
child1.component.ts
@Component({ selector: 'app-child1', templateUrl: './child1.component.html', styleUrls: ['./child1.component.css']})export class Child1Component implements OnInit { constructor(private eventBusService: EventBusService) { } ngOnInit(): void { } triggerEventBus(): void { this.eventBusService.evnetBus.next('child1 触发的事件'); }}
child1.component.html
<div class="panel panel-primary"> <div class="panel-heading">child1 组件</div> <div class="panel-body"> <button (click)="triggerEventBus()" class="btn btn-success">触发事件</button> </div></div>
child2.component.ts
@Component({ selector: 'app-child2', templateUrl: './child2.component.html', styleUrls: ['./child2.component.css']})export class Child2Component implements OnInit { events: Array<string> = new Array<string>(); constructor(private eventBusService: EventBusService) { } ngOnInit(): void { this.listenerEvent(); } listenerEvent(): void { this.eventBusService.evnetBus.subscribe( value => { this.events.push(value); }); }}
child2.component.html
<div class="panel panel-primary"> <div class="panel-heading">child2 组件</div> <div class="panel-body"> <p *ngFor="let event of events">{{event}}</p> </div></div>
brother.component.ts
@Component({ selector: 'app-brother', templateUrl: './brother.component.html', styleUrls: ['./brother.component.css']})export class BrotherComponent implements OnInit { constructor() { } ngOnInit(): void { }}
brother.component.html
<div class="panel panel-primary"> <div class="panel-heading">第二种:没有父子关系的组件间通讯</div> <div class="panel-body"> <app-child1></app-child1> <app-child2></app-child2> </div></div>
使用 localStorage 进行交互
local-child1.component.ts
@Component({ selector: 'app-local-child1', templateUrl: './local-child1.component.html', styleUrls: ['./local-child1.component.css']})export class LocalChild1Component implements OnInit { constructor() { } ngOnInit(): void { } writeData(): void { window.localStorage.setItem('message', JSON.stringify({name: 'star', age: 22})); }}
local-child1.component.html
<div class="panel panel-primary"> <div class="panel-heading"> LocalChild1 组件</div> <div class="panel-body"> <button class="btn btn-success" (click)="writeData()">写入数据</button> </div></div>
local-child2.component.ts
@Component({ selector: 'app-local-child2', templateUrl: './local-child2.component.html', styleUrls: ['./local-child2.component.css']})export class LocalChild2Component implements OnInit { constructor() { } ngOnInit(): void { } readData(): void { const dataStr = window.localStorage.getItem('message'); const data = JSON.parse(dataStr); console.log('name:' + data.name, 'age:' + data.age); }}
local-child2.component.html
<div class="panel panel-primary"> <div class="panel-heading">LocalChild2 组件</div> <div class="panel-body"> <button class="btn btn-success" (click)="readData()">读取数据</button> </div></div>
local-storage.component.ts
@Component({ selector: 'app-local-storage', templateUrl: './local-storage.component.html', styleUrls: ['./local-storage.component.css']})export class LocalStorageComponent implements OnInit { constructor() { } ngOnInit(): void { }}
local-storage.component.html
<div class="panel panel-primary"> <div class="panel-heading">第三种方案:利用 localStorge 通讯</div> <div class="panel-body"> <app-local-child1></app-local-child1> <app-local-child2></app-local-child2> </div></div>
最后,关于使用 Session、路由参数实现数据交互的方式,这里就不演示了。
以上是“Angular中组件间通讯的实现方法”这篇文章的所有内容,感谢各位的阅读!希望分享的内容对大家有帮助,更多相关知识,欢迎关注编程网行业资讯频道!
免责声明:
① 本站未注明“稿件来源”的信息均来自网络整理。其文字、图片和音视频稿件的所属权归原作者所有。本站收集整理出于非商业性的教育和科研之目的,并不意味着本站赞同其观点或证实其内容的真实性。仅作为临时的测试数据,供内部测试之用。本站并未授权任何人以任何方式主动获取本站任何信息。
② 本站未注明“稿件来源”的临时测试数据将在测试完成后最终做删除处理。有问题或投稿请发送至: 邮箱/279061341@qq.com QQ/279061341