ngValueEqualsDirective ( used in confirm password )

equals.js

(function(){
  'use strict';


  angular
    .module('app')
    .directive('equals',valueEquals);

    function valueEquals(){
      return {
          require: 'ngModel',
          link: function (scope, elem, attrs, model) {
              if (!attrs.equals) {
                  console.error('equals expects a model as an argument!');
                  return;
              }
              scope.$watch(attrs.equals, function (value) {
                  // Only compare values if the second ctrl has a value.
                  if (model.$viewValue !== undefined && model.$viewValue !== '') {
                      model.$setValidity('equals', value === model.$viewValue);
                  }
              });
              model.$parsers.push(function (value) {
                  // Mute the nxEqual error if the second ctrl is empty.
                  if (value === undefined || value === '') {
                      model.$setValidity('equals', true);
                      return value;
                  }
                  var isValid = value === scope.$eval(attrs.equals);
                  model.$setValidity('equals', isValid);
                  return isValid ? value : undefined;
              });
          }
      };
    }

})();