通过 Angular 资源服务读取 JSON [英] Reading in JSON through Angular Resources Service
问题描述
如何使用 angular-resources.js
通过服务读取 JSON 文件?
How can I use angular-resources.js
to read in a JSON file through a service?
我正在开发一个非常基本的 Angular 应用程序,用于测试目的,现在我只是想从 JSON 文件中读取数据.我将此代码放置在服务中,以便在移动基于服务器的数据存储时可以更轻松地将其替换.
I am working on a very basic Angular app for testing purposes and am just trying to read in data from JSON file right now. I am placing this code in a service so I can more easily swap it out when we move a server based data store.
我的App
和App.controller
声明如下:
'use strict';
// create module for custom directives
var App = angular.module('App', ['jsonService']);
// controller business logic
App.controller('AppCtrl', function AppCtrl($scope, JsonService) {
console.log("marker 1");
if (!$scope.jsonData) {
console.log("marker 2");
JsonService.getData(function (d) {
console.log(d);
$scope.jsonData = d;
$scope.records = d.length;
});
} else {
console.log("I have data already... " + $scope.jsonData);
}
console.log($scope.jsonData);
});
我的 JsonService
定义如下,目前:
My JsonService
is defined as the follow, at the moment:
'use strict';
angular.module('jsonService', ['ngResource'])
.factory('JsonService', function($resource, $filter) {
// define the remote service using Angular's $resource module
var service = $resource('/data/ProcessModeling-Resources.json', {});
var JsonService = {
// calls $resource.query() to retrieve the remote data.
getData : function getData(callback) {
console.log("marker 3");
service.query(function (data) {
console.log("marker 4");
});
}
};
return JsonService;
});
我得到的控制台输出如下:
The console output I am getting follows:
marker 1 app.js:8
marker 2 app.js:11
marker 3 services.js:13
undefined app.js:21
TypeError: Object #<Resource> has no method 'push'
at copy (http://127.0.0.1:8000/lib/angular.js:556:21)
at new Resource (http://127.0.0.1:8000/lib/angular-resource.js:330:9)
at http://127.0.0.1:8000/lib/angular-resource.js:386:32
at forEach (http://127.0.0.1:8000/lib/angular.js:117:20)
at http://127.0.0.1:8000/lib/angular-resource.js:385:19
at wrappedCallback (http://127.0.0.1:8000/lib/angular.js:6650:59)
at http://127.0.0.1:8000/lib/angular.js:6687:26
at Object.Scope.$eval (http://127.0.0.1:8000/lib/angular.js:7840:28)
at Object.Scope.$digest (http://127.0.0.1:8000/lib/angular.js:7707:25)
at Object.Scope.$apply (http://127.0.0.1:8000/lib/angular.js:7926:24) angular.js:5582
当我尝试调用我的 service.query(function (data) { }
时收到我的错误,它(如果我理解正确的话)应该拉入我的 JSON 文件.
I'm receiving my error when I attempt to call my service.query(function (data) { }
, which (if I'm understanding correctly) should be pulling my JSON file in.
我一直使用 AngularJS Cats App 作为提取数据的示例.>
I've been using AngularJS Cats App as an example for pulling data.
推荐答案
我会遵循 @pkozlowski 的建议并确保响应是一个数组.无论如何,这是一个从类似于您在评论中描述的 JSON 文件加载数据的示例.它使用 ngResource 并可以帮助你把事情放在一起:http://plnkr.co/edit/Ofq7Md8udEnIhAPF1NgL?p=preview
I'd follow @pkozlowski's advice and make sure the response is an array. Anyway, here's an example that loads data from a JSON file similar to what you describe in your comments. It uses ngResource and can help you put things together: http://plnkr.co/edit/Ofq7Md8udEnIhAPF1NgL?p=preview
服务
angular.module('jsonService', ['ngResource'])
.factory('JsonService', function($resource) {
return $resource('cats.json',{ }, {
getData: {method:'GET', isArray: false}
});
});
请注意,isArray
设置为 false
.
您的应用和控制器
var app = angular.module('app', ['jsonService']);
app.controller('ctrl', function($scope, JsonService){
JsonService.getData(function(data){
$scope.name = data.name;
$scope.children = data.children;
});
});
getData
实际上并不需要,因为 Resource 类为您提供了一些有用的便捷方法,例如 get
,您可以这样做>
getData
is actually not needed since the Resource class gives you some useful convenience methods such a get
, you can just do this
angular.module('jsonService', ['ngResource'])
.factory('JsonService', function($resource) {
return $resource('cats.json');
});
app.controller('ctrl', function($scope, JsonService){
JsonService.get(function(data){
$scope.name = data.name;
$scope.children = data.children;
});
});
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