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    <p><strong>Update</strong></p> <p>Most of this is outdated now with the progression of angularFire. Check out this module for an updated version: <a href="https://github.com/firebase/angularFire-seed/blob/master/app/js/module.simpleLoginTools.js" rel="nofollow">https://github.com/firebase/angularFire-seed/blob/master/app/js/module.simpleLoginTools.js</a></p> <p>It decorates <code>ng-cloak</code> to work with simple login and provides some optimized helper methods as well as working with recent versions.</p> <p><strong>Old Post</strong></p> <p>Authenticating requires a round trip to the server. In an SPA, you don't generally reload the page during normal usage so this is really superfluous in most cases.</p> <p>However, it's not difficult to solve with a moderate understanding of Angular. In fact, I taught this exact scenario as an example for writing directives in a recent workshop. <a href="https://gist.github.com/katowulf/7328023" rel="nofollow">Here's the gist I used</a>, and <a href="https://github.com/katowulf/codecamp-nov2013/tree/step3/app" rel="nofollow">here's an example app</a> that uses the gist.</p> <p>Note that if you try to clone the GitHub repo, you need to grab that particular tag (<code>git checkout step3</code>) as the course was taught in steps.</p> <p>For compliance with SO format, here's the contents of the gist. First the directive:</p> <pre><code>angular.module('waitForAuth', []) /** * A service that returns a promise object, which is resolved once angularFireAuth * is initialized (i.e. it returns login, logout, or error) */ .service('waitForAuth', function($rootScope, $q, $timeout) { var def = $q.defer(), subs = []; subs.push($rootScope.$on('angularFireAuth:login', fn)); subs.push($rootScope.$on('angularFireAuth:logout', fn)); subs.push($rootScope.$on('angularFireAuth:error', fn)); function fn() { for(var i=0; i &lt; subs.length; i++) { subs[i](); } $timeout(function() { // force $scope.$apply to be re-run after login resolves def.resolve(); }); } return def.promise; }) /** * A directive that hides the element from view until waitForAuth resolves */ .directive('ngCloakAuth', function(waitForAuth) { return { restrict: 'A', compile: function(el) { console.log('waiting'); el.addClass('hide'); waitForAuth.then(function() { el.removeClass('hide'); }) } } }) /** * A directive that shows elements only when the given authentication state is in effect */ .directive('ngShowAuth', function($rootScope) { var loginState; return { restrict: 'A', compile: function(el, attr) { var expState = attr.ngShowAuth; function fn(newState) { loginState = newState; el.toggleClass('hide', loginState !== expState ); } fn(null); $rootScope.$on("angularFireAuth:login", function() { fn('login') }); $rootScope.$on("angularFireAuth:logout", function() { fn('logout') }); $rootScope.$on("angularFireAuth:error", function() { fn('error') }); } } }); </code></pre> <p>And some example usages:</p> <pre><code>&lt;style&gt; .hide { display: none; } &lt;/style&gt; &lt;script&gt; // include the waitForAuth module as a dependency angular.module('myApp', ['waitForAuth']) // you can use waitForAuth directly from your scripts .controller('myController', function(waitForAuth) { waitForAuth.then(function() { /* do something after auth completes */ }) }) &lt;/script&gt; &lt;!-- and you can use the directives in your views --&gt; &lt;div ng-cloak-auth&gt;Authentication has resolved.&lt;/div&gt; &lt;div ng-show-auth="login"&gt;{{user.id}} is logged in&lt;/div&gt; &lt;div ng-show-auth="logout"&gt;Logged out&lt;/div&gt; &lt;div ng-show-auth="error"&gt;An error occurred during authentication&lt;/div&gt; </code></pre>
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