为什么我不能设置/获取$ rootScope? [英] Why I can't set/get $rootScope?
问题描述
我尝试在.run()的$ rootScope中设置一个值,并尝试在服务中获取它,但看起来好像是未定义的. .run()和服务中的所有其他程序都运行良好.
I try to set a a value in $rootScope in a .run() and try to get it in a service but it looks like it's undefined. Everything else in the .run() and in the service is running fine.
.run(function($ionicPlatform, $translate, $rootScope) {
document.addEventListener("deviceready",function(){ onDeviceReady($rootScope); }, false);
function onDeviceReady($rootScope) {
if(typeof navigator.globalization !== "undefined") {
navigator.globalization.getPreferredLanguage(function(language) {
$rootScope.language='en'; //(language.value).split('-')[0];
$translate.use((language.value).split("-")[0]).then(function(data) {
console.log("SUCCESS -> " + data);
}, function(error) {
console.log("ERROR -> " + error);
});
}, null);
}
}
})
.service('Webcache', function ($http, $q, apiHost, $rootScope) {
return {
getDataBySection: function (section, version, params) {
var params = params || {};
var host = apiHost;
var deferred = $q.defer();
var start = new Date().getTime();
params.lang = $rootScope.language;
$http.get('http://'+ host +'/api/'+ version +'/'+ section, {
cache: true,
params: params
}).success(function (response) {
deferred.resolve(response);
}).error(function (response){
deferred.resolve(false);
});
return deferred.promise;
}
};
})
推荐答案
您根本不应该绑定到onDeviceReady
事件. Ionic为您提供了一种角度兼容的处理方式:$ionicPlatform.ready()
会返回一个承诺.使用它会使您的代码看起来像这样:
You shouldn't be binding to the onDeviceReady
event at all. Ionic gives you an angular compatible way to handle it: $ionicPlatform.ready()
which returns a promise. Using this would make your code look something like this:
.run(function($ionicPlatform, $translate, $rootScope, $q, $log) {
$rootScope.languagePromise = $ionicPlatform.ready()
.then(function() {
return $q(function(resolve, reject) {
if(angular.isDefined(navigator.globalization)) {
navigator.globalization.getPreferredLanguage(function(language) {
$translate.use((language.value).split("-")[0]).then(function(data) {
$log.debug("SUCCESS -> " + data);
resolve(language);
}, function(error) {
$log.debug("ERROR -> " + error);
reject(error);
});
}, null);
} else { resolve('en'); }
});
});
})
这为您带来了希望,您可以随时使用它(立即完成初始化)或在可用时获取语言.
This puts a promise in the scope which you can use at any time to get the language either immediately (if the initialisation is completed), or when it becomes available.
.service('Webcache', function ($http, apiHost, $rootScope) {
return {
getDataBySection: function (section, version, params) {
params = params || {};
var host = apiHost;
return $rootScope.languagePromise.then(function(language) {
params.lang = language;
return $http.get('http://'+ host +'/api/'+ version +'/'+ section, {
cache: true,
params: params
}).catch(function (){
return false;
});
});
}
};
})
直接使用getDataBySection
方法返回等待语言承诺的结果,而语言承诺又取决于$http
承诺的结果,因此响应数据将像现有代码一样传播回去.
The getDataBySection
directly method returns the result of waiting on the language promise which in turn depends on the result of the $http
promise, so the response data will propagate back just as for your existing code.
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