Question

我对angular2和离子很新。所以我试图实现一个接受值的表单，并将提交给服务。我收到错误：

Error in ./RecordvisitPage class RecordvisitPage - caused by: formGroup expects a FormGroup instance. Please pass one in.

这是我的html页面：

<ion-content>
  <form [formGroup]="recordVisitForm">
    <ion-item>
      <ion-label>Action Date</ion-label>
      <ion-input formControlName="actionDate" name="actionDate"></ion-input>
    </ion-item>
    <ion-item>
      <ion-label>Contacted</ion-label>
      <ion-input formControlName="contacted" name="contacted"></ion-input>
    </ion-item>
 </form>
<ion-footer>
  <button ion-button navPop>Back</button>
  <button ion-button (click)="saveVisit()">Save</button>
</ion-footer>

所以附加到这个html页面的组件是：

public recordVisitForm: FormGroup;
constructor(public navCtrl: NavController, private  loanService : LoanService,  public formBuilder: FormBuilder, public params: NavParams) { 

    this.loan = params.get('loan');

    this.recordVisitForm = formBuilder.group({
      actionDate: ['', Validators.required],
      contacted: ['', Validators.required],

    });

  }

Answer 1

lut = [ [1], // n=0 [1,1], // n=1 [1,2,1], // n=2 [1,3,3,1], // n=3 [1,4,6,4,1], // n=4 [1,5,10,10,5,1], // n=5 [1,6,15,20,15,6,1]] // n=6 binomial(n,k): while(n >= lut.length): s = lut.length nextRow = [] nextRow[0] = 1 for(i=1, prev=s-1; i<prev; i++): nextRow[i] = lut[prev][i-1] + lut[prev][i] nextRow[s] = 1 lut.push(nextRow) return lut[n][k]

中缺少binomial(4,2)

this

formGroup需要一个formGroup实例，如何正确分配formcontrol名称

1 个答案: