title: Set submit button for ng-submit form
body: <p>According to <a href="https://docs.angularjs.org/api/ng/directive/form" rel="nofollow">the docs</a>, pressing enter in a form would "<em>trigger the click handler on the first button or input[type=submit] (ngClick) and a submit handler on the enclosing form (ngSubmit)</em>". Is there any way to instead set which button should be triggered?</p>
  
  <p>I have a form in which <a href="http://amsul.ca/pickadate.js/" rel="nofollow">pickadate.js</a> creates some button elements before the submit button.</p>