嵌套的自定义FormArray组件不与具有FormArrayName的子窗体绑定

Question

我试图使用CVA具有2个嵌套表单。问题是当我将第二个from绑定到formControl时没有用数据初始化。

Stackblitz

我有主表格：

this.requestForm = this.fb.group({
  garageId: 0,
  routes: new FormArray([
    new FormGroup({
      addressPointId: new FormControl,
      municipalityId: new FormControl,
      regionId: new FormControl,
      rvId: new FormControl,
      sequenceNumber: new FormControl,
      settlementId: new FormControl,
      regionName: new FormControl,
      municipalityName: new FormControl,
      settlementName: new FormControl,
      description: new FormControl,
    })
  ]),
  endDateTime: 0,
});

在主要形式的html中，我使用formArrayName将路由绑定到。

 <app-cva-form-array formArrayName="routes"></app-cva-form-array>

组件CVA-FORM-ARRAY具有。

form = new FormArray([
new FormGroup({
  addressPointId: new FormControl,
  municipalityId: new FormControl,
  regionId: new FormControl,
  rvId: new FormControl,
  sequenceNumber: new FormControl,
  settlementId: new FormControl,
  regionName: new FormControl,
  municipalityName: new FormControl,
  settlementName: new FormControl,
  description: new FormControl,
})
]);

从这里开始一切都很好。我将数组中的每个formGroup绑定到子组件CVA-FORM。

<app-cva-form [formControl]="route" (blur)="onTouched()"></app-cva-form>

对于每个formGroup的CVA-FORM，我创建了单独的组件，以防万一我想使用组件本身而不是整个数组。

  form: FormGroup = new FormGroup({
    regionName: new FormControl,
    regionId: new FormControl,
    municipalityName: new FormControl,
    municipalityId: new FormControl,
    sequenceNumber: new FormControl,
    settlementName: new FormControl,
    settlementId: new FormControl,
    addressPointId: new FormControl,
    description: new FormControl,
    rvId: new FormControl,
  });

主表单<-至-> app-cva-form-array绑定由于某些原因无法正常工作。

这些形式的思想来自kara关于angulaconnect的演讲。 这是她的幻灯片。

请帮助！

Answer 1

当您使用“自定义表单控件”时，需要考虑到您将cursom表单控件与表单控件（不是FormArray，不是FormGroup）一起提供了。FormControl具有一个数组或对象作为值，但是您不必对此感到困惑。（*）

您可以在stackblitz的工作中看到

那就是你的形式就像

//in main.form
this.requestForm = new FormGroup({
  garageId: new FormControl(0),
  routes: new FormControl(routes), //<--routes will be an array of object
  endDateTime: new FormControl(0)
})

//in cva-form-array
this.form=new FormArray([new FormControl(...)]); //<-this.form is a 
                             //formArray of FormControls NOT of formGroup

//finally in your cva-form
this.form=new FormGroup({});
this.form=formGroup({
      addressPointId: new FormControl(),
      municipalityId: new FormControl(),
      ...
})

我创建了一个const以导出为简单的代码。我的const expor是

export const dataI = {
  addressPointId: "",
  municipalityId: "",
  regionId: "",
  rvId: "",
  sequenceNumber: "",
  settlementId: "",
  regionName: "",
  municipalityName: "",
  settlementName: "",
  description: "",
}

因此，在mainForm中，我们有

  ngOnInit() {
    let routes:any[]=[];
    routes.push({...dataI});
    this.requestForm = new FormGroup({
      garageId: new FormControl(0),
      routes: new FormControl(routes),
      endDateTime: new FormControl(0)
    })
  }
<mat-card [formGroup]="requestForm" style="background: #8E8D8A">
    <app-cva-form-array formControlName="routes"></app-cva-form-array>
</mat-card>

在cvc-form数组中，当我们赋值时创建formArray

  writeValue(v: any) {
    this.form=new FormArray([]);
    for (let value of v)
        this.form.push(new FormControl(value))

    this.form.valueChanges.subscribe(res=>
    {
      if (this.onChange)
        this.onChange(this.form.value)
    })
  }

    <form [formGroup]="form" >
        <mat-card *ngFor="let route of form.controls; 
            let routeIndex = index; let routeLast = last;">
           <button (click)="deleteRoute(routeIndex)">
             cancel
           </button>
           <app-cva-form [formControl]="route" (blur)="onTouched()"></app-cva-form>
      </form>

最后，CVA形式

  writeValue(v: any) {
    this.form=new FormGroup({});
    Object.keys(dataI).forEach(x=>{
      this.form.addControl(x,new FormControl())
    })

    this.form.setValue(v, { emitEvent: false });
    this.form.valueChanges.subscribe(res=>{
       if (this.onChanged)
        this.onChanged(this.form.value)
    })
  }

<div [formGroup]="form">
  <mat-form-field class="locationDate">
    <input formControlName="regionName">
    <mat-autocomplete #region="matAutocomplete" 
      (optionSelected)="selectedLocation($event)">
      <mat-option *ngFor="let region of regions" 
      [value]="region">
        {{region.regionName}}
      </mat-option>
    </mat-autocomplete>
  </mat-form-field>
  <mat-form-field class="locationDate">
    <input formControlName="municipalityName" 
      [matAutocomplete]="municipality"
      (blur)="onTouched()"
      [readonly]="checked || this.form.value.regionId < 1">
   ....
   </form>

（*）是，我们习惯于看到FormControl具有字符串或数字作为值，但是没有人禁止我们将该值作为对象或数组（例如ng-bootstrap DatePicker存储对象{year ：.. month：..，day ..}，mat-multiselect存储数组，...）

更新当然，我们可以向控件提供来自服务或类似服务的数据。我们唯一需要考虑的就是我们如何提供数据。通常，我喜欢创建一个接收数据或null并返回FormControl的函数。

  getForm(data: any): FormGroup {
    data = data || {} as IData;
    return new FormGroup({
      garageId: new FormControl(data.garageId),
      routes: new FormControl(data.routes),
      endDateTime: new FormControl(data.endDateTime)
    })
  }

IData是接口

export interface IData {
  garageId: number;
  routes: IDetail[];
  endDateTime: any
}

和IDetail另一个接口

export interface IDetail {
  addressPointId: string;
  ...
  description: string;
}

然后我们可以得到一个复杂的数据，例如（大对象很抱歉）

let data = {
  garageId: 1,
  routes: [{
    addressPointId: "adress",
    municipalityId: "municipallyty",
    regionId: "regionId",
    rvId: "rvId",
    sequenceNumber: "sequenceNumber",
    settlementId: "settlementId",
    regionName: "regionName",
    municipalityName: "municipalityName",
    settlementName: "settlementName",
    description: "description",
  },
  {
    addressPointId: "another adress",
    municipalityId: "another municipallyty",
    regionId: "another regionId",
    rvId: "another rvId",
    sequenceNumber: "another sequenceNumber",
    settlementId: "another settlementId",
    regionName: "another regionName",
    municipalityName: "another municipalityName",
    settlementName: "another settlementName",
    description: "another description",
  }],
  endDateTime: new Date()
}

然后只需要make

this.requestForm = this.getForm(data);

堆栈闪电战（如果更新）