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！
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》
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。
使用 Service 进行交互
event-bus.service.ts
/**
* 用于充当事件总线
*/
@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，欢迎关注亿速云行业资讯频道！
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
