使用$ http从本地json文件获取值的替代方法

I want to load countries list from a countries json file stored locally. I have included the file in index.html as:

我想从本地存储的国家/地区json文件加载国家/地区列表。我已将该文件包含在index.html中：

<!-- Including Json -->
<script src="json/countries.json"></script>

The Json file is saved in json folder with name countries.json, the file contents are as:

Json文件保存在名为countries.json的json文件夹中，文件内容如下：

[  
   {  
      "country_id":"1",
      "country_name":"Afghanistan"
   },
   {  
      "country_id":"2",
      "country_name":"Albania"
   },
   {  
      "country_id":"3",
      "country_name":"Algeria"
   },
   {  
      "country_id":"4",
      "country_name":"American Samoa"
   },
   {  
      "country_id":"5",
      "country_name":"Andorra"
   },
   {  
      "country_id":"6",
      "country_name":"Angola"
   },
   {  
      "country_id":"7",
      "country_name":"Anguilla"
   },
   {  
      "country_id":"8",
      "country_name":"Antarctica"
   },
   {  
      "country_id":"9",
      "country_name":"Antigua and Barbuda"
   },
   {  
      "country_id":"10",
      "country_name":"Argentina"
   },
   {  
      "country_id":"11",
      "country_name":"Armenia"
   },
   {  
      "country_id":"12",
      "country_name":"Aruba"
   },
   {  
      "country_id":"13",
      "country_name":"Australia"
   },
   {  
      "country_id":"14",
      "country_name":"Austria"
   },
   {  
      "country_id":"15",
      "country_name":"Azerbaijan"
   },
   {  
      "country_id":"16",
      "country_name":"Bahamas"
   },
   {  
      "country_id":"17",
      "country_name":"Bahrain"
   },
   {  
      "country_id":"18",
      "country_name":"Bangladesh"
   },
   {  
      "country_id":"19",
      "country_name":"Barbados"
   },
   {  
      "country_id":"20",
      "country_name":"Belarus"
   },
   {  
      "country_id":"21",
      "country_name":"Belgium"
   },
   {  
      "country_id":"22",
      "country_name":"Belize"
   },
   {  
      "country_id":"23",
      "country_name":"Benin"
   },
   {  
      "country_id":"24",
      "country_name":"Bermuda"
   }
]

To just name a few countries.

仅举几个国家。

I could successfully parse the data and populate it to the UI from my controller referring the $htttp.get() service of angular as suggested by @jaime:

我可以成功地解析数据并将其填充到我的控制器的UI中，参考@jaime建议的$ htttp.get（）角度服务：

     //Getting the base url inorder to tell app where to find countries json
     var baseUrl = $location.absUrl().substring(0, $location.absUrl().indexOf('www')); 

                    //Fetching the countries Json
                    return $http.get(baseUrl+'www/json/countries.json')

                    //On Fetching the countries lsit
                    .then( function(response){
                        $scope.countryList =  response.data;
                    });

It works well, no doubt about it. But is there another alternative to achieve this functionality? Without using the $http.get()? I came accross angular.fromJson(), but it won't parse a file path as it requires it's argument to be a json object. Also I came across alternatives using jquery as in https://*.com/a/12091134/1904479. is there any other alternative which doesn't require jquery, Instead uses angular or ionic code?

它运作良好，毫无疑问。但是有另一种方法可以实现这个功能吗？不使用$ http.get（）？我来到angular.fromJson（），但它不会解析文件路径，因为它需要它的参数是一个json对象。另外，我在https://*.com/a/12091134/1904479中遇到了使用jquery的替代方案。有没有其他替代品，不需要jquery，而是使用角度或离子代码？

1 个解决方案

#1

Actually, we can use it, by declaring it in a constants file as:

实际上，我们可以通过在常量文件中声明它来使用它：

Step 1) Create a file constants.jsand add the json object into it:

步骤1）创建一个文件constants.js并将json对象添加到其中：

var ConstantsCountries  =  [  
       {  
          "country_id":"1",
          "country_name":"Afghanistan"
       },
       {  
          "country_id":"2",
          "country_name":"Albania"
       },
       {  
          "country_id":"3",
          "country_name":"Algeria"
       },
       {  
          "country_id":"4",
          "country_name":"American Samoa"
       },
       {  
          "country_id":"5",
          "country_name":"Andorra"
       },
       {  
          "country_id":"6",
          "country_name":"Angola"
       },
       {  
          "country_id":"7",
          "country_name":"Anguilla"
       },
       {  
          "country_id":"8",
          "country_name":"Antarctica"
       },
       {  
          "country_id":"9",
          "country_name":"Antigua and Barbuda"
       },
       {  
          "country_id":"10",
          "country_name":"Argentina"
       },
       {  
          "country_id":"11",
          "country_name":"Armenia"
       },
       {  
          "country_id":"12",
          "country_name":"Aruba"
       },
       {  
          "country_id":"13",
          "country_name":"Australia"
       },
       {  
          "country_id":"14",
          "country_name":"Austria"
       },
       {  
          "country_id":"15",
          "country_name":"Azerbaijan"
       },
       {  
          "country_id":"16",
          "country_name":"Bahamas"
       },
       {  
          "country_id":"17",
          "country_name":"Bahrain"
       },
       {  
          "country_id":"18",
          "country_name":"Bangladesh"
       },
       {  
          "country_id":"19",
          "country_name":"Barbados"
       }
    ]

Step 2: Include the js file in the index.html as:

第2步：在index.html中包含js文件：

<!-----Constants Classes---->
    <script src="Constants/Constants.js"></script>

Step 3: Use it in your controller as:

第3步：在控制器中使用它：

.controller('CountriesCtrl', function ($localStorage,$rootScope,$location,$ionicLoading,$ionicHistory,$timeout) { 
    $scope.countries = ConstantsCountries;
    console.log(angular.toJson($scope.countries));
}))

#1