我在显示新控制器的视图之前使用firebase下载了一些数据,但在显示数据之前模板“闪烁”。我不明白为什么,它应该立即显示数据,没有任何延迟。我记录了它并标记了每个单独的帧(http://i.imgur.com/pUsMCqX.gif)。控制台记录解析对象返回的数据。您可以看到,在记录数据时,模板显示的第2帧和第3帧没有数据。
模板:
<div ng-cloak class="wrapper select-character">
<div>
<div>
<h1>Select character</h1>
<div>
<button ng-click="createNewCharacter()">create new character</button>
</div>
characters' list
</div>
</div>
<div ng-repeat="character in characters">
<div>
Name: {{ character.name }}
<br>
Level: {{ character.level }}
<br>
<button ng-click="enterWorld(character.name)">Choose</button>
</div>
</div>
</div>
控制器:
'use strict';
angular.module('App')
.controller('SelectCharacterCtrl', function($scope, $firebaseSimpleLogin, $location, characters) {
$scope.createNewCharacter = function() {
$location.path("/create-character");
};
$scope.enterWorld = function(name) {
alert(name);
};
$scope.characters = characters;
});
应用:
'use strict';
angular.module('App', [
'ngCookies',
'ngResource',
'ngSanitize',
'ngRoute',
'firebase',
'angularfire.firebase',
'angularfire.login'
])
.config(function ($routeProvider) {
$routeProvider
.when('/', {
templateUrl: 'views/log-in.html',
controller: 'LogInCtrl'
})
.when('/select-character', {
templateUrl: 'views/select-character.html',
controller: 'SelectCharacterCtrl',
resolve: {
characters: function($q, $timeout, $firebase, $firebaseSimpleLogin) {
var deferred = $q.defer();
var loginObj = $firebaseSimpleLogin(new Firebase("https://<id>.firebaseio.com"));
loginObj.$getCurrentUser()
.then(function(user) { // get login data
var userSync = $firebase(new Firebase('https://<id>.firebaseio.com/users/' + user.uid));
return userSync.$asObject().$loaded();
})
.then(function(user) { // get all characters
var promises = [];
angular.forEach(user.characters, function(name) {
var promise = $firebase(new Firebase('https://<id>.firebaseio.com/characters/' + name));
promises.push(promise.$asObject());
});
$q.all(promises).then(function(sth) {
console.log(sth);
deferred.resolve(sth);
});
});
return deferred.promise;
}
}
})
.when('/create-character', {
templateUrl: 'views/create-character.html',
controller: 'CreateCharacterCtrl'
})
});
为什么在更新示波器之前模板“闪烁”而没有2帧数据?有什么想法吗?
答案 0 :(得分:2)
由于$asObject
未返回承诺,因此会立即解析您的承诺列表(而不是在下载所有数据之后)。更改您的列表也返回承诺:
angular.forEach(user.characters, function(name) {
var promise = $firebase(new Firebase('https://<id>.firebaseio.com/characters/' + name));
promises.push(promise.$asObject().$loaded());
});