title: How to disable FormControl in FormArray in Angular 4
body: <p>I wrote the below code snippet, which I considered as it will disable the <code>FormControl</code> in a <code>FormArray</code>.</p>
  
  <p><strong>some.component.html</strong></p>
  
  <pre><code>&lt;form [formGroup]="testForm"&gt;
      &lt;div *ngFor="let num of countArr"&gt;
          &lt;input type="text" formNameArray="arrs"&gt;
      &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p><strong>some.component.ts</strong></p>
  
  <pre><code>countArr = [1, 2, 3, 4, 5];
  count = 5;
  arrs;
  testForm: FormGroup;
  
  this.testForm = this.formBuilder.group(
      arrs: this.formBuilder.array([])
  );
  
  this.arrs = this.testForm.get('arrs');
  
  for (let i = 0; i &lt; this.count; i++) {
      this.arrs.insert(i, new FormControl({value: '', disabled: true}));
  }
  </code></pre>
  
  <p>But after <code>for</code> execution completed, I checked the form and found nothing has been disabled. Can you please tell me where I am doing wrong??? :-)</p>
  
  <p>Thank you for your help!!! :-)</p>