title: Angular Form does not submit on enter when not focused
body: <p>I have some Angular 6 forms and I focus on the first available field. They contain a submit button and when I press enter, the form is submitted automatically and the ngSubmit event is triggered.</p>
  <p>There is one particular form which only contains a radio group, and I am not focusing on any field. In this case, ngSubmit is not triggered.</p>
  <p>If I click on a radio button and then press enter, the form submits correctly.</p>
  <p>Is there any way of making the form submit on enter even if none of the fields within the form are focused? Should I focus on the form itself somehow?</p>
  <p>Form:</p>
  <pre><code>&lt;form (ngSubmit)=&quot;onSubmit()&quot; [formGroup]=&quot;form&quot;&gt;
      &lt;mat-radio-group [formControl]=&quot;control&quot; name=&quot;test&quot;&gt;
          &lt;mat-radio-button *ngFor=&quot;let option of options&quot; [value]=&quot;option.key&quot;&gt;
          {{option.value}}
          &lt;/mat-radio-button&gt;
      &lt;/mat-radio-group&gt;
      &lt;button&gt;Submit&lt;/button&gt;
  &lt;/form&gt;
  </code></pre>
  <p><strong>Stackblitz:</strong>
  <a href="https://stackblitz.com/edit/angular-arcwjv?file=src/app/app.component.html" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-arcwjv?file=src/app/app.component.html</a></p>