angularjs - 如何从AngularJS中选择的ng-change调用服务方法？

Question

我是 Angular JS 新手。我试图从 select 的 ng-change 调用工厂服务方法“getScoreData”，但无法完成它。请帮忙。

HTML 代码:

<select ng-model="Score" ng-change="getScoreData(Score)" ng-options="c.name for c in     Scores"></select>

Angularjs 代码:

var app = angular.module('audiapp', []);

app.controller('audiLayoutCtrl', function ($scope, ScoreDataService) {
    ScoreDataService.getScoreData($scope.Score, function (data) {
        $scope.ScoreData = data;
    });
});

app.factory('ScoreDataService', function ($http) {
    return {
        getScoreData: function (Score, callback) {
            var params = {
                questionCode: Score.code
            }

            return $http({
                url: 'Home/GetAvgData',
                method: 'GET',
                params: params
            }).success(callback);
        }
    };
});

上面是服务工厂方法及其从 Controller 实例化。我尝试从 select 的 ng-change 实例化，但它既没有给出错误，也没有被调用。

Answer 1

您的代码中至少存在两个问题:

• ng-change="getScoreData(分数)

  Angular 没有看到引用已定义服务的 getScoreData 方法

• getScoreData:函数(分数、回调)

  我们不需要使用回调，因为GET返回promise。请改用 then。

这是一个工作示例(我仅使用随机地址进行模拟):

HTML

<select ng-model="score"
        ng-change="getScoreData(score)" 
        ng-options="score as score.name for score in  scores"></select>
    <pre>{{ScoreData|json}}</pre> 

JS

var fessmodule = angular.module('myModule', ['ngResource']);

fessmodule.controller('fessCntrl', function($scope, ScoreDataService) {

    $scope.scores = [{
        name: 'Bukit Batok Street 1',
        URL: 'http://maps.googleapis.com/maps/api/geocode/json?address=Singapore, SG, Singapore, 153 Bukit Batok Street 1&sensor=true'
    }, {
        name: 'London 8',
        URL: 'http://maps.googleapis.com/maps/api/geocode/json?address=Singapore, SG, Singapore, London 8&sensor=true'
    }];

    $scope.getScoreData = function(score) {
        ScoreDataService.getScoreData(score).then(function(result) {
            $scope.ScoreData = result;
        }, function(result) {
            alert("Error: No data returned");
        });
    };

});

fessmodule.$inject = ['$scope', 'ScoreDataService'];

fessmodule.factory('ScoreDataService', ['$http', '$q', function($http) {

    var factory = {
        getScoreData: function(score) {
            console.log(score);
            var data = $http({
                method: 'GET',
                url: score.URL
            });


            return data;
        }
    }
    return factory;
}]);

演示 Fiddle