![](/img/trans.png)
[英]Angular Reactive Forms with FormArray inside a nested FormGroup
[英]Accessing FormArray inside nested FormGroup , angular6
我有一個簡單的反應形式
ngOnInit() {
this.outerForm = this._formBuilder.group({
firstFormGroup: this._formBuilder.group({
nserNumber: ['', [Validators.required, Validators.pattern(this.spacePattern)]],
}),
secondFormGroup: this._formBuilder.group({
nser1Number: ['', [Validators.required, Validators.pattern(this.spacePattern)]],
connectionRow: this._formBuilder.array([{
connectionType: [''],
switchHostname: ['']
}])
})
});
}
我可以在UI中顯示它。 但是我無法顯示connectionRow
<fieldset formGroupName="secondFormGroup">
<input matInput placeholder="PID number" id='nser1Number' formControlName="nser1Number">
<div class='formRow' *ngFor="let itemrow of connectionRow.controls; let i=index" [formGroupName]="i">
{{i}}
</div>
</fieldset>
錯誤TypeError:無法讀取未定義的屬性“控件”
請幫忙
您錯過了在模板中提及formArrayName的內容。
在HTML中更新
<fieldset formGroupName="secondFormGroup">
<input matInput placeholder="PID number" id='nser1Number' formControlName="nser1Number">
<div formArrayName="connectionRow">
<div class='formRow' *ngFor="let itemrow of connectionRow.controls; let i=index" [formGroupName]="i">
<input matInput placeholder="Tenant" formControlName="connectionType">
<input matInput placeholder="Tenant" formControlName="switchHostname">
</div>
</div>
</fieldset>
並在TS文件中
get connectionRow(): FormArray {
return this.outerForm.get('secondFormGroup').get("connectionRow") as FormArray;
}
enter code here
要處理每個輸入的錯誤,請將其包裝在mat-form-field容器中。 您可以參考以下內容
<mat-form-field>
<input matInput placeholder="Enter your email" formControlName="connectionType" required>
<mat-error *ngIf="connectionRow.controls[i].connectionType.invalid">Your message</mat-error>
</mat-form-field>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.