更新
随着 angularFire 的发展，现在大部分内容已经过时了。查看此模块以获取更新版本：https://github.com/firebase/angularFire-seed/blob/master/app/js/module.simpleLoginTools.js
它装饰了ng-cloak 以使用简单的登录，并提供一些优化的帮助方法以及使用最新版本。
旧帖
身份验证需要往返服务器。在 SPA 中，您通常不会在正常使用期间重新加载页面，因此在大多数情况下这确实是多余的。
不过，只要对 Angular 有一定的了解，解决起来并不难。事实上，我在最近的一次研讨会上讲了这个确切的场景作为编写指令的示例。 Here's the gist I used 和 here's an example app 使用要点。
请注意，如果您尝试克隆 GitHub 存储库，则需要获取该特定标签 (git checkout step3)，因为该课程是分步教授的。
为了符合 SO 格式，这里是要点的内容。首先是指令：
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 < 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') });
}
}
});
以及一些示例用法：
<style>
.hide { display: none; }
</style>
<script>
// 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 */
})
})
</script>
<!-- and you can use the directives in your views -->
<div ng-cloak-auth>Authentication has resolved.</div>
<div ng-show-auth="login">{{user.id}} is logged in</div>
<div ng-show-auth="logout">Logged out</div>
<div ng-show-auth="error">An error occurred during authentication</div>