Undefined variable when initializing with ng-init

As a newcomer to AngularJS (and JavaScript in general), I'm currently facing an issue that I could use some help with.

Below is the HTML template I am using:

<ion-view view-title="Playlists">
  <ion-content>
    <ion-list>
        <ion-item ng-repeat="playlist in playlists" ng-init="pageID=playlist.id" href="#/app/music/{{playlist.id}}">
            {{playlist.title}} {{pageID}}
        </ion-item>
    </ion-list>
  </ion-content>
</ion-view>

And this is the corresponding controller:

.controller('MusicCtrl', function($scope) {
  $scope.playlists = [
    { title: 'Reggae', id: 1 },
    { title: 'Chill', id: 2 },
    { title: 'Dubstep', id: 3 },
    { title: 'Indie', id: 4 },
    { title: 'Rap', id: 5 },
    { title: 'Cowbell', id: 6 }
  ];
  $scope.$watch('pageID', function () {
    console.log($scope.pageID); 
  });

Although {{pageID}} appears correctly on the page, it seems undefined when checked in the console. Can anyone point out what mistakes I might be making here?

javascriptangularjsionic-framework

Answer №1

When you see undefined for pageid in the console, it is because you have not properly defined it in your controller. Instead of just assigning a value in ng-init, make sure to define it within your controller. By doing this, you can avoid seeing undefined.

.controller('MusicCtrl', function($scope) {
   $scope.pageID = 1;//just an example

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