[英]Why $state.go doesn't work when destination state or it's parent resolves with promise
我嘗試使用resolve加載父狀態的一些數據,並在應用程序運行時將用戶重定向到默認狀態:
app.config(['$stateProvider', '$urlRouterProvider', function($stateProvider, $urlRouterProvider) {
$stateProvider.state('home', {
url: '/',
template: '<div><a ui-sref="home">Start App</a> <a ui-sref="home.main">Home</a> <a ui-sref="home.other">Other state</a><div ui-view>Loading...</div></div>',
resolve: {
user: ['$timeout', '$q',
function($timeout, $q) {
var deferred = $q.defer();
var promise = deferred.promise;
var resolvedVal = promise.then(function() {
console.log('$timeout executed');
return {Id: 12, email: 'some@email.com', name: 'some name'};
}, function() {
console.log('Error happend');
});
$timeout(function() {
deferred.resolve();
}, 2000);
return resolvedVal;
}]
//user: function() {return {id: 222, name: 'testname', email: 'test@em.ail'}; }
},
controller: ['$scope', 'user', function($scope, user) {
$scope.user = user;
}]
});
$stateProvider.state('home.other', {
url: 'other',
template: '<div>Your name is {{user.name}}, and email is {{user.email}}</div><div>This is other state of application, I try to make it open as default when application starts, by calling to $state.transitionTo() function in app.run() method</div>',
resolve: {
someObj: function() {
console.log('hello');
return {someProp: 'someValue'};
}
},
controller: ['$scope', 'user', function($scope, user) {
$scope.user = user;
}]
});
}]);
app.run(['$state', '$rootScope', function ($state, $rootScope) {
$state.go('home.other');
}]);
並且這不會更改地址欄中的url並且不顯示home.other狀態的模板(雖然home.state的解析功能已執行且控制台中有'hello')。 但是當我在解析中評論promise函數時,反而把簡單的函數返回對象應用程序重定向到預期。
而不是$ timeout嘗試做$ http請求實際上會在那里,但也沒有運氣。
並回答我自己的問題 - 由於在$ state.go('home.other')被調用之后,摘要周期開始處理請求的url並且當resolve函數創建了deffered對象時發生了不需要的行為,盡管此對象已解析,狀態引擎已經傳遞到請求的URL狀態。 所以為了防止這種情況,我使用了下面解釋的技術:
如果在應用程序啟動時需要在某些情況下放棄執行請求的URL狀態解析,可以使用$ stateChangeStart事件,如下所示:
app.run(['$state', '$rootScope', '$timeout', function ($state, $rootScope, $timeout) {
var appStarted = 0; // flag to redirect only once when app is started
$rootScope.$on('$stateChangeStart',
function(event, toState, toParams, fromState, fromParams) {
if(appStarted) return;
appStarted = 1;
event.preventDefault(); //prevents from resolving requested url
$state.go('home.other'); //redirects to 'home.other' state url
});
}]);
還有一個來自user3357257提供的相同鏈接的替代解決方案,我認為它有點清潔。
app.run(['$state', '$rootScope', '$timeout', function ($state, $rootScope, $timeout) {
$timeout(function() { $state.go('home.other'); });
}]);
訣竅是將$state.go()
包裝到$timeout()
這樣它就不會被覆蓋。
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