Utilizing an undefined constant in angular programming may lead to unexpected errors

Seeking assistance in generating random first and last names based on gender for a form using Angular. I am relatively new to Angular and keep encountering this error whenever the

 Use of undefined constant firstName - assumed 'firstName' 

Here's my View:

 @section('content')
 <form ng-app="getNameApp" ng-controller="getNameController">

   Male<input type="radio" ng-model="gender" value="male" name="gender" /><br />
   Female<input type="radio" ng-model="gender" value="female" name="gender" /><br />

   <input type="text" ng-model="{{ firstName }}" name="firstName" />
   <input type="text" ng-if="{{ lastName }}" value="{{ lastName.body }}" name="lastName" />

  <button ng-click="randomNameController()">Randomize</button>
</form>
@stop

This is my JS file

angular.module('getNameApp', [])
.controller('getNameController', getNameController);

function getNameController ($scope, $http) {
   $scope.gender = 'male';

   var randomName = $http({
       url: '/randomName',
       method: "GET",
       params: {gender: $scope.gender}
   });

   randomName.success(function(data) {
       $scope.firstName = data.firstName;
       $scope.lastName = data.lastName;
   });
   randomName.error(function() {
       document.write(randomName);
   });

}

This is my Controller

 public function randomName () {
    $faker = Faker\Factory::create();
    $gender = Input::get('gender');

    if ($gender == 'male') {
        $names = [
            'firstName' => $faker->firstNameMale
        ];
    } else {
        $names = [
            'firstName' => $faker->firstNameFemale
        ];
    }
    $names['lastName'] = $faker->lastName;
    return $names;
}

Update: Upon checking the network tab in inspect element, it indicates a 500 internal server error with createCharacter route (page).

Answer №1

Although I haven't encountered this specific error before, it seems like you may be experiencing an issue where you are attempting to access the firstName property from a promise.

randomName.success(function() {
     $scope.firstName = randomName.firstName; //<-- In this line, randomName is actually a promise and not data
     $scope.lastName = randomName.lastName;
  });

To resolve this, make sure to access the data that is passed as the first argument of the success callback function:

randomName.success(function(data) {
     $scope.firstName = data.firstName; 
     $scope.lastName = data.lastName;
  });

Answer №2

After some trial and error, it seems that the key to solving this issue is to exclude brackets from ng-model="". Despite encountering several obstacles in my code, I managed to come up with a functional version below. Hopefully, this solution proves useful to others facing similar challenges, despite its lack of elegance.

The snippet provided creates a form that generates a randomly assigned name based on the selected gender. Users can choose a gender and click 'Randomize' to receive a different name each time. To accomplish this, I utilized the https://github.com/fzaninotto/Faker library for name generation.

Visual representation:

<form ng-app="getNameApp" ng-controller="getNameController">

  Male<input type="radio" ng-model="gender" value="male" name="gender" /><br />
  Female<input type="radio" ng-model="gender" value="female" name="gender" /><br />

  <input type="text" ng-model="firstName" name="firstName" />
  <input type="text" ng-model="lastName" name="lastName" />

  <button ng-click="generate(gender)">Randomize</button>
</form>

Javascript logic:

 angular.module('getNameApp', []).controller('getNameController', getNameController);

function getNameController ($scope, $http) { $scope.gender = 'male';

$scope.generate = function (gender) {
    var randomName = $http({
        url: '/randomName',
        method: "GET",
        params: {gender: gender}
    });

    randomName.success(function (data) {
        var names = {
            firstName: data.firstName,
            lastName: data.lastName
        };
        $scope.firstName = names.firstName;
        $scope.lastName = names.lastName;

    });
    randomName.error(function () {
        document.write(randomName);
    });
    return $scope;
};

   $scope.generate($scope.gender);
}

Back-end controller:

public function randomName () {
    $faker = Faker\Factory::create();
    $gender = Input::get('gender');

    if ($gender == 'male') {
        $names = [
            'firstName' => $faker->firstNameMale
        ];
    } else if ($gender == 'female') {
        $names = [
            'firstName' => $faker->firstNameFemale
        ];
    }
    $names['lastName'] = $faker->lastName;
    return $names;
}

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