AngularJS：使用共享服务（以$资源）共享控制器之间的数据，但如何界定回调函数？ [英] AngularJS: Using Shared Service(with $resource) to share data between controllers, but how to define callback functions?

问题描述

请注意：我也贴在这里AngularJS邮件列表这个问题：<一href=\"https://groups.google.com/forum/#!topic/angular/UC8_pZsdn2U\">https://groups.google.com/forum/#!topic/angular/UC8_pZsdn2U

Note: I also posted this question on the AngularJS mailing list here: https://groups.google.com/forum/#!topic/angular/UC8_pZsdn2U

大家好，

我建设我的第一个AngularJS应用程序，不是很熟悉JavaScript有这么任何指导，开始将大大AP preciated：）

I'm building my first AngularJS app and am not very familiar with Javascript to begin with so any guidance will be much appreciated :)

我的应用程序有两个控制器，ClientController和CountryController。在CountryController，我从使用$资源对象的CountryService检索的国家名单。这工作得很好，但我希望能够与大家分享了ClientController的国家名单。经过一番研究，我读，我应该使用CountryService来存储数据，并注入该服务为两个控制器。

My App has two controllers, ClientController and CountryController. In CountryController, I'm retrieving a list of countries from a CountryService that uses the $resource object. This works fine, but I want to be able to share the list of countries with the ClientController. After some research, I read that I should use the CountryService to store the data and inject that service into both controllers.

这是code我收到了：

This was the code I had before:

CountryService：

CountryService:

services.factory('CountryService', function($resource) {
    return $resource('http://localhost:port/restwrapper/client.json', {port: ':8080'});
});

CountryController：

CountryController:

//Get list of countries         
//inherently async query using deferred promise
$scope.countries = CountryService.query(function(result){       
        //preselected first entry as default
    $scope.selected.country = $scope.countries[0];  
});

和我的变化后，他们看起来是这样的：

And after my changes, they look like this:

CountryService：

CountryService:

services.factory('CountryService', function($resource) {
    var countryService = {};

    var data;
    var resource = $resource('http://localhost:port/restwrapper/country.json', {port: ':8080'});

    var countries = function() {
        data = resource.query();
        return data;
    }

    return {
        getCountries: function() {
            if(data) {
                console.log("returning cached data");
                return data;
            } else {
                console.log("getting countries from server");
                return countries(); 
            }

        }
    };
  });

CountryController：

CountryController:

$scope.countries = CountryService.getCountries(function(result){
        console.log("i need a callback function here...");
});

---

问题是，我曾经是能够使用$ resource.query回调函数（），以preSELECT默认的选择，但现在我搬到查询（）我CountryService内打电话，我似乎已经失去了什么。

---

The problem is that I used to be able to use the callback function in $resource.query() to preselect a default selection, but now that I've moved the query() call to within my CountryService, I seemed to have lost what.

什么是去解决这个问题的最好方法是什么？

What's the best way to go about solving this problem?

感谢您的帮助，
肖恩

Thanks for your help, Shaun

推荐答案

Ok..so看起来像我传递一个回调函数一路攀升到resource.query（）调用解决了这个问题。还不能确定这是否是做到这一点的最好办法。

Ok..so looks like I solved the problem by passing a callback function all the way up to the resource.query() call. Still not sure if this is the best way to do this.

作为参考，这是我做过什么：

For reference, this is what I did:

CountryController：

CountryController:

$scope.countries = CountryService.getCountries(function(){
    //preselected default
    $scope.selected.country = $scope.countries[0];  
});

CountryService：

CountryService:

//Country Service. Will contain all relevant rest methods here
services.factory('CountryService', function($resource) {
    var countryService = {};

    var data;
    var resource = $resource('http://localhost:port/restwrapper/country.json', {port: ':8080'});

    var countries = function(callback) {
        data = resource.query(callback);
        return data;
    }


    return {
        getCountries: function(callback) {
            if(data) {
                console.log("returning cached data");
                return data;
            } else {
                console.log("getting countries from server");
                return countries(callback); 
            }

        }
    };
  });

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