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;
  });
});

这篇关于通过 Angular 资源服务读取 JSON的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！