我是Reactive Forms的新手,我试图制作一个 indicadores
与 answers
的组件:
有了这个组件:
addAnswers(indicador: Indicador, answer?: any):void {
const indicadoresFormArray = <FormArray>this.customForm.controls['indicadores'];
let label = answer ? answer.label : '';
let value = answer ? answer.value : '';
let superi = 0;
for(let i = 0; i < indicadoresFormArray.length; i++) {
if(indicadoresFormArray.value[i].id == indicador.id) {
superi = i;
}
}
(<FormArray>(<FormGroup>(indicadoresFormArray).controls[superi])
.controls['answers']).push(
new FormGroup({
label: new FormControl(label),
value: new FormControl(value)
})
)
}
和模板
<div *ngFor="let indicador of customForm.controls['indicadores'].controls">
<div class="row" *ngFor="let answer of indicador.controls['answers'].controls">
<div class="input-field col m5 s6"><input formControlName="label" placeholder="Etiqueta" /></div>
<div class="input-field col m5 s6"><input formControlName="value" placeholder="Valores" /></div>
<div class="input-field col m2 s12 center-align">
<button type="button" class="btn-floating waves-effect waves-light" (click)="addAnswer()"><i class="material-icons">add</i></button>
</div>
</div>
</div>
它总是抛出异常:
ERROR Error: Cannot find control with name: 'label'
ERROR Error: Cannot find control with name: 'value'
而我也不知道为什么......
console.log(indicadoresFormArray);
1 回答
您的模板存在一些问题,缺少一些
formArrayName
和formGroupName
.每个
FormArray
都需要在模板formArrayName="the name of the array"
中进行标记,如果你在数组中嵌套了FormGroup
,则需要在这种情况下使用索引(从FormArray
的迭代中获得)来标记,如下所示:[formGroupName]="i"
或formGroupName="{{i}}"
.因此,您的模板应如下所示:
PLUNKER