Question

我正在尝试将mat-select与表单数组一起使用。由于某种原因，它给了我以下错误：对于数组中的每个项目，都没有用于路径为'profileGroup-> meterings-> 0-> selected'的表单控制的值访问器。

  <div formGroupName="profileGroup" [class.active]="!show" class="inner-area">
        <mat-form-field formArrayName="meterings">
           <mat-select multiple>
                    <div *ngFor="let metering of meteringArray; let i = index">
                        <div [formGroupName]="i">
                            <mat-option formControlName="selected" [value]="metering.value">
                                {{ metering.value.name }}
                            </mat-option>
                        </div>
                    </div>
          </mat-select>
       </mat-form-field>
<div>

      this.mainForm = this.fb.group({
                profileGroup: this.fb.group({
                    meterings: this.fb.array([]),
                    from: [""],
                    to: [""]
                })
            });
    addMetering(metering: Metering) {
        const control = (this.mainForm.controls["profileGroup"] as FormGroup).get("meterings") as FormArray;
        control.push(this.createItem(metering));
    }
    createItem(metering: Metering): FormGroup {
        return this.fb.group({
            name: metering.name,
            id: metering.meteringId,
            selected: false
        });
    }

    get meteringArray() {
        return ((this.parent.controls["profileGroup"] as FormGroup).get("meterings") as FormArray).controls;
    }

Answer 1

您混入了不同的概念。选择多个材质是存储数组（以及对象数组或字符串数组）的控件。然后，您遍历元素的简单数组以在这些元素中进行选择。没有意义的使用FormArray，也没有向Array添加元素。所以我想你有一些像

meterings=[
  {name:"metering 1",id:1}
  {name:"metering 2",id:2}
  {name:"metering 3",id:2}
]
this.mainForm = this.fb.group({
   profileGroup: this.fb.group({
     meterings: [[]],
     from: [""],
     to: [""]
   })
});

.html

<div formGroupName="profileGroup" [class.active]="!show" class="inner-area">
   <mat-form-field >
     <mat-select fromGroupName="meterings">
         <mat-option *ngFor="let metering of meterings; let i = index"
                  [value]="metering.value">
            {{ metering.value.name }}
         </mat-option>
      </mat-select>
    </mat-form-field>
<div>

您的表单可以获取值，例如

mainform={
   profileGroup:{
       metering:[1,2]
       from:''
       to:''
   }
}

另一件事是，您要输入一个FormControls的FormArray。但是，那么您就不必使用选择倍数了

 this.mainForm = this.fb.group({
   profileGroup: this.fb.group({
      meterings: this.fb.array([]),
      from: [""],
      to: [""]
   })
 });

.html

<div formGroupName="profileGroup" [class.active]="!show" class="inner-area">
   <mat-form-field formArrayName="meterings">
       <div *ngFor="let metering of meteringArray; let i = index" [formGroupName]="i">
         <mat-checkbox formControlName="selected">
         </mat-checkbox>
         <input mat-input formControlName="name">
         <input mat-input formControlName="id">
      </div>
   </mat-form-field>
</div>

您的来信就像

mainform={
   profileGroup:{
       metering:[
          {id:1,name:"metering 1",true},
          {id:1,name:"metering 1",false}
       ]
       from:''
       to:''
   }
}

带有mat-select的角动态表单无法获取值访问器

1 个答案: