我没有收到任何错误，但数据没有传递给父组件。我这样做的方式与我在网上找到的所有例子有点不同，所以我已经不太确定如何设置它了。这是迄今为止的代码。
我如何在private String data1, data2;
public ReceivablesSummaryFragment () {
// Required empty public constructor
}
public static ReceivablesSummaryFragment newInstance(String param1, String param2) {
ReceivablesSummaryFragment fragment = new ReceivablesSummaryFragment ();
Bundle args = new Bundle();
args.putString("first data", param1);
args.putString("second data", param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
data1= getArguments().getString("first data);
data2= getArguments().getString("second data");
}
}
Child Component //a variable that stores the fetched data from a group of radio buttons
selected = {value1: '', value2: ''};
//the output variable
@Output() selectedO: EventEmitter<any> = new EventEmitter();
public sendAnswer = (): void => {
this.selectedO.emit(this.selected);
}
模板中的输入
Child Component我如何在<input type="radio"
[attr.name] = "quesForm.value.name"
[attr.id] = "ans.id"
[attr.value] = "ans.answer"
(click) = "getSelected(ans)" //fetches data I want to pass
(click) = "sendAnswer()" //sets fetched data to @Output
hidden
/>
模板
Parent Component我如何在<multiple-choice-radio *ngIf="expbTrigger"
[question]="question01"
(selectedO)="selectedI" //where I'm trying to pull the data into parent component
></multiple-choice-radio>
Parent Component这是我理性化的最好方法，试图让这一切都有效。我在这里做错了什么？
答案 0 :(得分：2)
如果提供字段或方法名称，事件绑定不会分配或调用，它只是执行表达式。因此，表达式需要包括赋值或调用。 $event引用了发出的值。
(selectedO)="selectedI = $event" // field
或
(selectedO)="selectedI($event)" // method