Troubleshooting: AngularJS encountering difficulty retrieving data from Service

I am encountering an issue with sending data to a controller from a service that calls an API. To demonstrate this problem, I have utilized http://embed.plnkr.co/jEQMch/ as the basis of my sample application and tweaked it to develop a bullet chart.

The structure of my controller is as follows:

var app = angular.module('plunker', ['nvd3', 'gridster', 'plunker.services']);

app.controller('MainCtrl', function($scope, $timeout, DataService) {
  // Controller logic goes here
});

This is how my dataservice appears:

angular.module('plunker.services', [])
.factory('DataService', function($http, $q) {
    return{
      bulletChart: {
            options: bulletChartOptions,
            data: bulletChartData
            } 
        };

/**
     *  Data & Options Generators
*/
    // Functions for generating options and data for the bullets chart
});

When using the 'bulletChartDataTest' function in my service, the graph displays correctly: https://i.sstatic.net/JnNOd.png

However, when switching to 'bulletChartData', the graph does not appear to be working properly. It seems like 'data: bulletChartData' is causing the issue. Can anyone provide guidance on what might be wrong with my 'bulletChartData' method?

Answer №1

The reason behind this issue lies in the difference between bulletChartDataTest and bulletChartData. In bulletChartDataTest, the data is readily available and simply needs to be returned. However, in bulletChartData, a service call must be made which returns a promise. This asynchronous nature of the service call causes the data not to refresh even after it has been successfully retrieved. One solution is to fetch the data upon loading, store it in a controller scope variable, then bind this variable to the data attribute of the nvd3 directive in the view. This way, the chart will automatically update once the response is received, rendering it on the DOM.

<nvd3 options="widget.chart.options" data="chartData" api="widget.chart.api" 
          config="config" events="events"></nvd3>

To make the service call for fetching chart data in the controller:

DataService.bulletChart.servicedata().then(function(data){
    $scope.chartData = data;
});

In this case, 'servicedata' is a factory function responsible for making the actual service call.

You can access a working version of this implementation on Plunker: https://plnkr.co/edit/WG6PJO?p=preview

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