title: How to disable a button in angular 2 and then enable it once the data loads
body: <p>I have a form with save button.Once the data is loaded in the form then only I need to enable the save button.</p>
  
  <p>How to disable a button in angular 2? This might sound simple.</p>
  
  <p>Things I tried</p>
  
  <p>1 - <code>[disabled]="true"</code> but it does not work.</p>
  
  <p>2 - <code>[disabled]="!isValid"</code> but it does not work.</p>