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<form name="myForm">
    <input name="myText" type="text" ng-model="mytext" required />
    <button ng-disabled="myForm.$invalid">Save</button>
  </form>

<button ng-disabled="myForm.$invalid">Submit Me</button>

<body>
    <div class="slide-animate" ng-include="'form.html'"></div>
    <div class="slide-animate" ng-include="'button.html'"></div>
  </body>

function myCtrl($scope) {
    $scope.submit = function () {
        alert('Submit button enabled');
    }
}