AngularJS is throwing an error because it is unable to access the property `$valid` on an undefined object

I am currently working on a web application using AngularJS and I have created the following form:

<form name="form2" novalidate><multiselect class="input-xlarge" multiple="true"
ng-model="selectedCar" options="c.name for c in cars" change="selected()"></multiselect> 
<input type="file" file-modelsr = "myFileDL" />
<input type="file" file-modelsr="myFileID" />
<input type="submit" value="{{ 'NEXT' | translate }}" class="blue-button" ng-click="saveDetail()">

Below you can find the JavaScript code associated with this form:

var myapp = angular.module('RoslpApp');
(function () {
    angular.module('RoslpApp').controller('CarOutside', ['$scope', '$http', '$translatePartialLoader', '$translate', '$state', '$stateParams', 'cfg', 'toastr', '$cookieStore', '$filter', '$anchorScroll', '$location', 'fileUpload',
        function ($scope, $http, $translatePartialLoader, $translate, $state, $stateParams, cfg, toastr, $cookieStore, $filter, $anchorScroll, $location, fileUpload) {
            $translatePartialLoader.addPart('ServiceRequest');
            $translate.refresh();
            var cookiePreferredLanguage = $cookieStore.get('PreferredLanguage');
            var LoginID = $cookieStore.get("LoginID");
            var baseurl = cfg.Baseurl;
            $translate.use((cookiePreferredLanguage != null && cookiePreferredLanguage != undefined && cookiePreferredLanguage != "") ? cookiePreferredLanguage : 'de_AR');
            $scope.name = 'World';
            //Bind data to multi select dropdown(location)
            $scope.cars = [{ id: 1, name: 'Audi' }, { id: 2, name: 'BMW' }, { id: 1, name: 'Honda' }];
            $scope.selectedCar = [];
            //Bind data to period
            $scope.periodList = [{ id: 1, period: 'Audi' }, { id: 2, period: 'BMW' }, { id: 1, period: 'Honda' }];

            if ($scope.form2.$valid) {
                $scope.saveDetail = function () {
                    var fileDL = $scope.myFileDL;
                    var fileID = $scope.myFileID;
                    var uploadUrl = "/fileUpload";
                    fileUpload.uploadFileToUrl(file, uploadUrl);
                };
            } else {
                alert("not valid");
            }
    }]);
})();

I encountered an error stating that I cannot read property $valid of undefined, and I'm struggling to understand why this is happening. Any assistance or guidance would be greatly appreciated. Thank you.

Answer №1

Ensure that your check is placed inside the saveDetail() function. The condition ($scope.form2.$valid) is being evaluated when the controller is executed, before $scope.form2 has any data available, resulting in it being undefined.

       $scope.saveDetail = function() {
            if ($scope.form2.$valid) {
            var fileDL = $scope.myFileDL;
            var fileID = $scope.myFileID;
            var uploadUrl = "/fileUpload";
            fileUpload.uploadFileToUrl(file, uploadUrl);
            } else {
                alert("not valid");
            }
        };

Answer №2

Consider moving the if.. else statements inside the function saveDetail, instead of having them outside.

Currently, the error occurs because when trying to execute $scope.form2.$valid, the form (form2) has not been initialized yet and is therefore undefined. This results in getting $valid as undefined

$scope.saveDetail = function () {
  if ($scope.form2.$valid) {
    var fileDL = $scope.myFileDL;
    var fileID = $scope.myFileID;
    var uploadUrl = "/fileUpload";
    fileUpload.uploadFileToUrl(file, uploadUrl);
  } else {
    alert("not valid");
  }
};

Answer №3

Make sure to wrap the if....else.. statement within the saveDetail() function.

Additionally, consider passing form2.$valid as an argument to the method in ng-submit like so:

ng-submit="saveDetail(form2.$valid)"
. Then, inside the function, you can check if it is true or false.

var app = angular.module("app", []);
app.controller("ctrl", function($scope) {
  $scope.saveDetail = function(valid) {
    if (valid) {
      console.log("Data is valid.");
    } else {
      console.log("Data is not valid.")
    }
  }
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="app" ng-controller="ctrl">
  <form name="form2" novalidate ng-submit="saveDetail(form2.$valid)">
    <multiselect class="input-xlarge" multiple="true" ng-model="selectedCar" options="c.name for c in cars" change="selected()"></multiselect>
    <input type="file" file-modelsr="myFileDL" />
    <input type="file" file-modelsr="myFileID" />
    <input type="submit" value="{{ 'NEXT'}}" class="blue-button">
  </form>
</body>

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