Angular cannot set property of undefined

13
votes

I can't quite figure out why the following isn't working:

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";

  }
});

When I run the code I can an error that states:

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)

Clearly I'm missing something super obvious..

4
javascriptangularjs

4 Answers

42
votes

You're defining a property to an undefined object, you have to initialized your object before setting properties. 

$scope.message = {};
$scope.message.test = 'bla';
5
votes

You should initialize your $scope.message object, but do it safely (just in case it's defined somewhere else, maybe in some circumstanes):

$scope.message = $scope.message || {}; 
$scope.message.test = "blablabla";
4
votes

message in your code is not an object, you must make it:

$scope.message = { test: 'blablabla' };
2
votes

your test does not exist inside a message, you need to do $scope.message = {}; before , $scope.message.test = "blablabla";