Angular 1.4: Empty Fiddle

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HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0-rc.1/angular.js"></script>
<div ng-controller="MyCtrl">
  <a class='btn btn-success' ng-disabled='true' ng-click='tada()'>
      Отправить
    </a>
  <button class='btn btn-success' ng-disabled='true' ng-click='tada()'>
    Отправить
  </button>

</div>

JavaScript

var app = angular.module('App', [])

app.controller('MyCtrl', ['$scope', function($scope) {
    $scope.tada = function() {
      alert('tada');
    };
  }
]);