AngularJS Chart Directive - Data loaded in async service not updating chart - angularjs

Question

I am having one chart directive created, and I am bootstrpping the app after loading google api. In following code, a simple data table is working fine. But when I load data from server in async manner, chart is not being displayed.
Controller
'use strict';
myNetaInfoApp.controller('allCandidatesController', [
'$scope','allCandidates2009Svc', '$timeout',
function ($scope, allCandidates2009Svc, $timeout) {
$scope.data1 = {};
$scope.data1.dataTable = new google.visualization.DataTable();
$scope.data1.dataTable.addColumn("string", "Party");
$scope.data1.dataTable.addColumn("number", "qty");
$scope.data1.dataTable.title = "ASDF";
$timeout( function (oldval, newval) {
allCandidates2009Svc.GetPartyCriminalCount().then(function(netasParty) {
var i = 0;
for (var key in netasParty) {
$scope.data1.dataTable.addRow([key.toString(), netasParty[key]]);
i++;
if (i > 20) break;
}
});
});
$scope.dataAll = $scope.data1;
//sample data
$scope.data2 = {};
$scope.data2.dataTable = new google.visualization.DataTable();
$scope.data2.dataTable.addColumn("string", "Name");
$scope.data2.dataTable.addColumn("number", "Qty");
$scope.data2.dataTable.addRow(["Test", 1]);
$scope.data2.dataTable.addRow(["Test2", 2]);
$scope.data2.dataTable.addRow(["Test3", 3]);
}
]);
Service
'use strict';
myNetaInfoApp.factory('allCandidates2009Svc', ['$http', '$q',
function ($http, $q) {
var netas;
return {
GetPartyCriminalCount: function () {
var deferred = $q.defer();
$http.get('../../data/AllCandidates2009.json')
.then(function (res) {
netas = res;
if (netas) {
var finalObj = {};
_.each(netas.data, function(neta) {
finalObj[neta.pty] = finalObj[neta.pty] ? finalObj[neta.pty] + 1 : 1;
});
deferred.resolve(finalObj);
}
});
return deferred.promise;
}
};
}]);
Directive
"use strict";
var googleChart = googleChart || angular.module("googleChart", []);
googleChart.directive("googleChart", function () {
return {
restrict: "A",
link: function ($scope, $elem, $attr) {
var dt = $scope[$attr.ngModel].dataTable;
var options = {};
if ($scope[$attr.ngModel].title)
options.title = $scope[$attr.ngModel].title;
var googleChart = new google.visualization[$attr.googleChart]($elem[0]);
$scope.$watch($attr.ngModel, function (oldval, newval) {
googleChart.draw(dt, options);
});
}
};
});
HTML
<div ng-controller="allCandidatesController">
<div class="col-lg-6">
<h2>Parties and Candidates with Criminal Charges</h2>
<div google-chart="PieChart" ng-model="dataAll" class="bigGraph"></div>
<!--<p><a class="btn btn-primary" href="#" role="button">View details »</a></p>-->
</div>
<div class="col-lg-6">
<h2>Heading</h2>
<div google-chart="BarChart" ng-model="data2" class="bigGraph"></div>
</div>
</div>

Answer 1

I think you need to wrap your function body in allCandidates2009Svc factory with scope.$apply(). But the return deferred.resolve() will be outside scope.$apply().
function asyncGreet(name) {
var deferred = $q.defer();
setTimeout(function() {
// since this fn executes async in a future turn of the event loop, we need to wrap
// our code into an $apply call so that the model changes are properly observed.
scope.$apply(function() {
deferred.notify('About to greet ' + name + '.');
if (okToGreet(name)) {
deferred.resolve('Hello, ' + name + '!');
} else {
deferred.reject('Greeting ' + name + ' is not allowed.');
}
});
}, 1000);
return deferred.promise;
}
Read the docs here
http://docs.angularjs.org/api/ng.$q