The property being set in Angular is undefined, causing an error

I am struggling to understand why the code below is not functioning as intended:

Main.html

<div class="MainCtrl">
  <h1>{{message.test}}</h1>
</div>

Main.js

angular.module('myApp')
  .controller('MainCtrl', function(someService, $location, $scope) {

    $scope.message.test = "blablabla";

  }
});

Upon running the code, I encounter the following error message:

TypeError: Cannot set property 'test' of undefined at new (http://localhost:9000/scripts/controllers/main.js:13:25) at invoke (http://localhost:9000/bower_components/angular/angular.js:4473:17) at Object.instantiate (http://localhost:9000/bower_components/angular/angular.js:4481:27) at http://localhost:9000/bower_components/angular/angular.js:9108:28 at $route.link (http://localhost:9000/bower_components/angular-route/angular-route.js:977:26) at invokeLinkFn (http://localhost:9000/bower_components/angular/angular.js:8746:9) at nodeLinkFn (http://localhost:9000/bower_components/angular/angular.js:8246:11) at compositeLinkFn (http://localhost:9000/bower_components/angular/angular.js:7637:13) at publicLinkFn (http://localhost:9000/bower_components/angular/angular.js:7512:30) at name.$get.boundTranscludeFn (http://localhost:9000/bower_components/angular/angular.js:7656:16)

It seems like there is a simple mistake that I am overlooking..

javascriptangularjs

Answer №1

If you try to assign a property to an unspecified object, make sure to create the object first before adding properties.

$scope.data = {};
$scope.data.value = 'hello';

Answer №2

To ensure proper initialization of the $scope.message object, it is recommended to initialize it safely in order to avoid any potential conflicts:

$scope.message = $scope.message || {}; 
$scope.message.content = "Lorem ipsum";

Answer №3

content in your script is not recognized as an entity, it needs to be:

$variable.content = { example: 'something' };

Answer №4

Your examination isn't present in a message, so make sure to initialize it with $scope.message = {}; beforehand followed by 

$scope.message.examination = "example";

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