如何在 angular7 中使用 EventEmitter

Question

我在一個文件中定義了我的組件，我想在父函數中向子組件發送數據表單父組件工作正常但 eventEmitter 不發出

這是我的組件文件有兩個組件

import { Component, OnInit, Inject ,EventEmitter,Output} from '@angular/core';
    import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material';

export interface DialogData {
    name: string;
}

@Component({
    selector: 'app-new-time-register',
    templateUrl: './new-time-register.component.html',
    styleUrls: ['./new-time-register.component.scss']
})
export class NewTimeRegisterComponent implements OnInit {

    constructor(public dialog: MatDialog) { }

    ngOnInit() {
    }

    openDialog(modal:string): void {
        const dialogRef = this.dialog.open(RegisterDialog, {
            width: '480px',
            data: {name: modal}
        });
    }

    testEvent(value){
        console.log(value,"OOOOOOOOOOOOOOOOOOOO");
    }
}

@Component({
    selector: 'register-dialog',
    templateUrl: 'register-dialog.html',
    styleUrls: ['./new-time-register.component.scss']
})
export class RegisterDialog{

    constructor(
        public dialogRef: MatDialogRef<RegisterDialog>,
        @Inject(MAT_DIALOG_DATA) public data: DialogData) {}
    showAllPersons: Boolean = false;
    onNoClick(): void {
        this.dialogRef.close();
    }

    @Output() testEmit = new EventEmitter<string>();

    testEventEmitter(){
        console.log('TTTTTTTTTTTTTTTTTT');
        this.testEmit.emit("Test EventEmitter");
    }
}

這是 register-dialog.html 文件

<span class="panel-title" (click)='testEventEmitter()'>Computicate Trial Account Manager</span>

這是我的孩子 app-new-time-register html 文件

<register-dialog (testEmit)='testEvent($event)'></register-dialog>

這是一個子組件

testEvent(value){
        console.log(value,"OOOOOOOOOOOOOOOOOOOO");
    }

Answer 1

參考您的堆棧閃電戰，一切都可以進行一些更改。

您必須在app.module.ts 中添加RegisterDialog 。

 declarations: [AppComponent, HelloComponent, RegisterDialog]

同樣在app.component.html 中，您必須將$event變量添加到發射器：

<register-dialog (testEmit)='checkEvent($event)'></register-dialog>

現場示例：

https://stackblitz.com/edit/angular-stack-55945887?file=src%2Fapp%2Fapp.component.html