JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://cdn.jsdelivr.net/foundation/4.3.2/css/foundation.min.css">
<script src="https://code.angularjs.org/1.3.0-beta.17/angular.min.js"></script>
<div ng-app="myApp">
<form name="signup_form" ng-controller="FormController" ng-submit="submitForm()" novalidate>
  <div ng-repeat="field in fields" ng-form="signup_form_input">
    <input type="text"
           name="dynamic_input"
           ng-required="field.isRequired"
           ng-model="field.name"
           ng-model-options="{ updateOn: 'blur' }"
           placeholder="{{field.placeholder}}" />
    <div ng-show="signup_form_input.dynamic_input.$dirty && signup_form_input.dynamic_input.$invalid">
      <span class="error" ng-show="signup_form_input.dynamic_input.$error.required">The field is required.</span>
    </div>
  </div>
  <button type="submit" ng-disabled="signup_form.$invalid">Submit All</button>
</form>
</div>

CSS

input.ng-invalid.ng-dirty {
  border: 1px solid red;
}

input.ng-valid {
  border: 1px solid green;
}

JavaScript

angular.module('myApp', [])
.controller('FormController', function($scope) {
  $scope.fields = [
    {placeholder: 'Username', isRequired: true},
    {placeholder: 'Password', isRequired: true},
    {placeholder: 'Email (optional)', isRequired: false}
  ];

  $scope.submitForm = function() {
    alert("it works!");
  };
});