app.scss

form i.icon.error {
  color: $assertive;
}

form input + i.icon.error {
  display: none;
  margin-left: 8px;
}

form.ng-submitted input.ng-invalid + i.icon.error {
  display: block;
}

form .has-error {
  border-left: 5px solid darken($assertive, 15%);
}

form .has-success {
  border-left: 5px solid darken($energized, 15%);
}

form.ng-submitted input.ng-valid + i.icon.error {
  display: none;
}

directives.js

angular.module('app', [...] )
.directive('onValidSubmit', ['$parse', '$timeout', function($parse, $timeout) {
    return {
      require: '^form',
      restrict: 'A',
      link: function(scope, element, attrs, form) {
        form.$submitted = false;
        var fn = $parse(attrs.onValidSubmit);
        element.on('submit', function(event) {
          scope.$apply(function() {
            element.addClass('ng-submitted');
            form.$submitted = true;
            if (form.$valid) {
              if (typeof fn === 'function') {
                fn(scope, {$event: event});
              }
            }
          });
        });
      }
    }

  }])
  .directive('validated', ['$parse', function($parse) {
    return {
      restrict: 'AEC',
      require: '^form',
      link: function(scope, element, attrs, form) {
        var inputs = element.find("*");

        var processInputs = function(input) {
          var attributes = input.attributes;
          if (attributes.getNamedItem('ng-model') != void 0 && attributes.getNamedItem('name') != void 0) {
            var field = form[attributes.name.value];
            if (field != void 0) {
              scope.$watch(function() {
                return form.$submitted + "_" + field.$valid;
              }, function() {
                if (form.$submitted != true) return;
                var inp = angular.element(input);
                if (inp.hasClass('ng-invalid')) {
                  element.removeClass('has-success');
                  element.addClass('has-error');
                } else {
                  element.removeClass('has-error').addClass('has-success');
                }
              });
            }
          }
        };

        for(var i = 0; i < inputs.length; i++) {
          processInputs(inputs[i]);
        }
      }
    }
  }])
;

form.html

    <form novalidate="novalidate" on-valid-submit="doLogin()">
    <div class="list card">
      <div class="item item-divider">Enter your info:</div>
      <label class="item item-input validated">
        <span class="input-label">Email</span>
        <input type="text" ng-model="user.email" required="required" name="email">
        <i class="icon ion-alert-circled error"></i>
      </label>
      <label class="item item-input validated">
        <span class="input-label">Password</span>
        <input type="password" ng-model="user.password" name="password" required="required">
        <i class="icon ion-alert-circled error"></i>
      </label>
    </div>
    <div class="padding">
      <button type="submit" class="button icon-right ion-chevron-right button-block button-energized">
        login
      </button>
    </div>
    </form>