Angular 4 – 从子组件调用父方法不起作用
发布时间:2020-12-17 17:51:55 所属栏目:安全 来源:网络整理
导读:我的所有事件发射器都正常工作,除了一个. child.ts: @Component({ ... outputs: ['fileUploaded'] })export class childComponent implements OnInit { ... fileUploaded = new EventEmitterboolean(); ... randomMethod(){ ... this.fileUploaded.emit(tru
我的所有事件发射器都正常工作,除了一个.
child.ts: @Component({ ... outputs: ['fileUploaded'] }) export class childComponent implements OnInit { ... fileUploaded = new EventEmitter<boolean>(); ... randomMethod(){ ... this.fileUploaded.emit(true); } } 从我将要显示的父组件中调用randomMethod() parent.html ... <child (fileUploaded)="onSubmit($event)"></child> .. parent.ts export class parentComponent { ... theChild = new childComponent; submitted = false; ... onSubmit(event: boolean) { console.log('in onSubmit()'); this.submitted = event; } functionCallsChild(){ this.theChild.randomMethod(); ... this.theChild = new childComponent; } } 我的应用程序从不记录“在onSubmit()”中,为什么不调用此方法?我也尝试不在我的最后一行创建一个新的子对象,但这并没有什么区别. 解决方法
您选择的子组件是错误的,您应该像这样使用ViewChild:
parent.html: <child #theChild (fileUploaded)="onSubmit($event)"></child> parent.ts: export class parentComponent { ... @ViewChild('theChild') theChild; submitted = false; ... onSubmit(event: boolean) { console.log('in onSubmit()'); this.submitted = event; } functionCallsChild(){ this.theChild.randomMethod(); ... } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |