[英]Alternative way to fetch value from a local json file using $http
我想從本地存儲的國家json文件加載國家列表。 我將文件包含在index.html
為:
<!-- Including Json -->
<script src="json/countries.json"></script>
Json文件保存在名稱為countries.json的json文件夾中,文件內容為:
[
{
"country_id":"1",
"country_name":"Afghanistan"
},
{
"country_id":"2",
"country_name":"Albania"
},
{
"country_id":"3",
"country_name":"Algeria"
},
{
"country_id":"4",
"country_name":"American Samoa"
},
{
"country_id":"5",
"country_name":"Andorra"
},
{
"country_id":"6",
"country_name":"Angola"
},
{
"country_id":"7",
"country_name":"Anguilla"
},
{
"country_id":"8",
"country_name":"Antarctica"
},
{
"country_id":"9",
"country_name":"Antigua and Barbuda"
},
{
"country_id":"10",
"country_name":"Argentina"
},
{
"country_id":"11",
"country_name":"Armenia"
},
{
"country_id":"12",
"country_name":"Aruba"
},
{
"country_id":"13",
"country_name":"Australia"
},
{
"country_id":"14",
"country_name":"Austria"
},
{
"country_id":"15",
"country_name":"Azerbaijan"
},
{
"country_id":"16",
"country_name":"Bahamas"
},
{
"country_id":"17",
"country_name":"Bahrain"
},
{
"country_id":"18",
"country_name":"Bangladesh"
},
{
"country_id":"19",
"country_name":"Barbados"
},
{
"country_id":"20",
"country_name":"Belarus"
},
{
"country_id":"21",
"country_name":"Belgium"
},
{
"country_id":"22",
"country_name":"Belize"
},
{
"country_id":"23",
"country_name":"Benin"
},
{
"country_id":"24",
"country_name":"Bermuda"
}
]
僅舉幾個國家。
我可以成功解析數據,並通過@jaime建議的angular的$htttp.get()
服務從控制器將其填充到UI中:
//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){
$scope.countryList = response.data;
});
毫無疑問,它運作良好。 但是還有另一種方法可以實現此功能嗎? 不使用$ http.get()? 我遇到了angular.fromJson() ,但是它不會解析文件路徑,因為它需要將參數作為json對象。 我也遇到了使用jquery的替代方法,如https://stackoverflow.com/a/12091134/1904479 。 還有其他不需要jQuery的替代方法,而是使用角度或離子代碼嗎?
實際上,我們可以通過在常量文件中將其聲明為:
步驟1)創建一個文件constants.js
並將json對象添加到其中:
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"
}
]
第2步:將js文件包含在index.html
如下所示:
<!-----Constants Classes---->
<script src="Constants/Constants.js"></script>
步驟3:在您的控制器中以下列方式使用它:
.controller('CountriesCtrl', function ($localStorage,$rootScope,$location,$ionicLoading,$ionicHistory,$timeout) {
$scope.countries = ConstantsCountries;
console.log(angular.toJson($scope.countries));
}))
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