how to call service method from ng-change of select in angularjs? - angularjs

Question

I am new to angular js. I am trying to call factory service method 'getScoreData' from ng-change of select, but not able to get it done. please help.
Html code:
<select ng-model="Score" ng-change="getScoreData(Score)" ng-options="c.name for c in Scores"></select>
Angularjs code:
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);
}
};
});
above is the service factory method and its instantiate from controller. I tried instantiating from ng-change of select but its neither giving error nor its getting called.

Answer 1

You have at least two issues in your code:
ng-change="getScoreData(Score)
Angular doesn't see getScoreData method that refers to defined service
getScoreData: function (Score, callback)
We don't need to use callback since GET returns promise. Use then instead.
Here is a working example (I used random address only for simulation):
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;
}]);
Demo Fiddle