fab-manager/app/frontend/templates/shared/_coupon.html

<div class="form-group m-b-lg" ng-show="show">
  <a ng-click="code.input = true" ng-hide="code.input" class="b-b pointer" translate>{{ 'app.shared.coupon_input.i_have_a_coupon' }}</a>

  <div ng-show="code.input">
    <label for="coupon_code" translate>{{ 'app.shared.coupon_input.code_' }}</label>
    <div class="input-group m-b">
      <input type="text"
             class="form-control"
             name="coupon_code"
             ng-model="couponCode"
             id="coupon_code"
             ng-model-options='{ debounce: 1000 }'
             ng-change='validateCode()'/>
      <span class="input-group-addon" ng-class="{'label-success': status == 'valid', 'label-danger text-white': status == 'invalid'}">
        <i class="fa fa-spinner fa-pulse fa-fw" ng-show="status == 'pending'"></i>
        <i class="fa fa-times" ng-show="status == 'invalid'"></i>
        <i class="fa fa-check" ng-show="status == 'valid'"></i>
      </span>
    </div>

    <uib-alert ng-repeat="msg in messages" type="{{msg.type}}"  close="closeMessage($index)">{{msg.message}}</uib-alert>
  </div>
</div>