Ionic 3 formarray 验证动态单选按钮组

Question

我正在尝试验证从数组对象动态创建的单选按钮组，我希望它以我发布了一个寻求答案的问题的形式进行验证，但我没有得到澄清并再次进行了一些研究并发现了这个文章循序渐进，找到了formArrayName，但无法实现验证

<form[formGroup]="form">
  <ion-select formControlName="type">
    <ion-option value="1">Full Time</ion-option>
    <ion-option value="2">Part Time</ion-option>
  </ion-select>

  <div formArrayName="employee_details">
    <ion-row class="rows" *ngFor="let employee of employee;  let rowIndex = index">
      <ion-col text-center="text-center" col-6="col-6">
        [ {{employee.id}} ]
        <br> {{employee.name}}
      </ion-col>
      <ion-col class="rows last" col-6="col-6">
        <ion-list class="row" no-lines="no-lines" radio-group="radio-group">
          <ion-item col-4="col-4">
            <ion-radio class="radio " mode="md" value="Paid"></ion-radio>
          </ion-item>
          <ion-item col-4="col-4">
            <ion-radio class="radio " mode="md" value="Unpaid"></ion-radio>
          </ion-item>

        </ion-list>
      </ion-col>
    </ion-row>
  </div>

</form>

JS

import { FormBuilder, FormGroup, FormControl,FormArray, Validators } from '@angular/forms ';

class type {
  public name: string;
  public id: string;
}
...
class employee {
  public name: string;
  public id: string;
}
...
employee: employee = [{
  id: 1,
  name: "emp1"
}, {
  id: 2,
  name: "emp2"
}, {
  id: 3,
  name: "emp3"
}];
form: FormGroup;

this.form = new FormGroup({
  'type': new FormControl(null, [Validators.required]),
  'employee_details': new FormArray([])
});
Object.keys(this.employee).forEach(function(key, index) {
  console.log(key);
  // problem is here 
  const control = new FormControl(null, Validators.required);
  ( < FormArray > this.form.get('employee_details')).push(control);

});

Answer 1

这不是formArray，但绝对能帮到你..

.html

<form [formGroup]="form">
<ion-row class="rows" *ngFor="let detail of details; let i = index">
    <ion-col text-center="text-center" col-6="col-6">
        {{your_data}}
    </ion-col>
    <ion-col class="rows last" col-6="col-6">
        <ion-list class="row" no-lines="no-lines" radio-group="radio-group" formControlName="action{{i}}">
            <ion-item col-4>
                <ion-radio class="radio true" mode="md" value="true"></ion-radio>
            </ion-item>
            <ion-item col-4>
                <ion-radio class="radio false" mode="md" value="false"></ion-radio>
            </ion-item>
            <ion-item col-4>
                <ion-radio class="radio " mode="md" value="not sure"></ion-radio>
            </ion-item>
        </ion-list>
    </ion-col>
</ion-row>
<button ion-button (click)="submit()" [disabled]="!form.valid">Submit</button>
</form>

.ts 在您获取数据的位置添加此代码。

let i;
for(i in this.details){
  this.form.setControl('action'+i, new FormControl('', Validators.required));
}

变量 'i' 只是用来产生 0,1,2,3 以添加控件名称。您可以使用自己的方式来执行此操作，但需要循环。

Answer 2

您可以简单地通过数组map，然后为每个元素创建一个FormControl

，而不是做你现在正在做的事情

试试这个：

this.form = new FormGroup({
  type: new FormControl(null, [Validators.required]),
  employee_details: new FormArray([this.employee.map(emp => new FormControl(null, Validators.required))])
});