How to verify if an object is empty in an AngularJS expression

I need to display either a Login or Logout button based on the value of a $rootScope variable. Currently, only the Logout button is showing up in the li tag below. I have specific actions that should occur after certain events:

After Logging In:-

$rootScope.userData = response.userdata; //response.userdata is an Object

After Logging Out:-

delete $rootScope.userData;
$rootScope.userData = null;

In the Controller:-

console.log($rootScope.userData); //Object {}

Html Code:-

<li ng-if="$root.userData == null"><a href="#/login"><i class="fa fa-lock"></i> Login</a></li>
<li ng-if="$root.userData != null"><a href="#/logout"><i class="fa fa-lock"></i> Logout</a></li>
javascriptangularjs

Answer №1

login ng-if="!$root.userData.length"

logout ng-if="$root.userData.length"

I suggest creating a MainController, loading loggedin data into a model named user, and adding this MainController to the <body> tag for easy access to the loggedin user throughout the application instead of adding it to rootScope.

You could also develop a service that determines if a user is logged in and returns data. By creating a model called isAuthenticated with either true or false based on the login status checked by the service, you can use ng-if="isAuthenticated" and ng-if="!isAuthenticated".

Answer №2

Consider utilizing ng-show instead of ng-if in your code.

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