title: Disable ngbDatepicker input
body: <p>Im using <code>ngbDatepicker</code> and <code>ng2-datepicker-jalali</code>. I use <code>ngbDatepicker</code> directive like below:</p>
  
  <pre><code>   &lt;div class="input-group" dir="ltr"&gt;
        &lt;input class="form-control" 
            placeholder="yyyy/m/d" 
            name="dp" 
            [(ngModel)]="registerDate" 
            ngbDatepicker 
            [firstDayOfWeek] = "6"
            [disabled]="disabled"
            #d="ngbDatepicker" &gt;
            &lt;button class="input-group-addon" (click)="d.toggle()" type="button"&gt;
                &lt;i class="fa fa-calendar"&gt;&lt;/i&gt;
            &lt;/button&gt;
      &lt;/div&gt;
  </code></pre>
  
  <p> </p>
  
  <p>I'm <strong>trying to disable input</strong> to force select date from datepicker.  <code>[disabled]="disabled"</code> attr disables whole datepicker. </p>