Tips on passing parameters during the initialization of an angular factory

Imagine a scenario where an Angular factory holds a substantial amount of raw data (referred to as _fakeData), and I aim to reveal a specific portion of the data based on the parameters passed during initialization (known as _exposedData).

Currently, I have implemented a method called init(language) that sets this._exposedData to a certain value depending on the language parameter. Subsequently, all other factory methods operate based on _exposedData.

However, to make this approach effective, I must first invoke the init() method and then constantly check if it has been called before using any other factory methods, making the process quite cumbersome.

I acknowledge that my current solution is not very efficient, and I seek advice on a better way to organize and structure my factory. Can someone provide guidance in this regard?

angular.module('testApp', [])
.factory('TestFactory', function() {
    return  {
        //raw data set that should not be accessed or modified
        //access should be done through _exposedData instead
        _fakeData: {
            javascript: 'blah blah',
            ruby: 'blah blah blah',
            python: 'blah blah blah blah'
        },
        _isInitialised: false,
        init: function(language) {
            if (this._fakeData[language]) {
                this._exposedData = this._fakeData[language]; 
                this._isInitialised = true;
                return this;
            }
            throw new Error('Cannot initialize');
        },
        getData: function() {
            this._checkInitialised();
            return this._exposedData;
        },
        //checks whether init() has been called
        _checkInitialised: function() {
            if (!this._isInitialised) {
                throw new Error('Not initialized');
            }
        }

    }
})
.controller('TestCtrl', function($scope, TestFactory) {
    console.log(TestFactory.init('javascript').getData());
})

http://jsfiddle.net/3jJeE/

Answer №1

One way to accomplish this is by using the module.run function. Make sure to include the init method within run.

myappModule.run(function(TestFactory) {
   TestFactory.init('javascript');
});

Answer №2

angular.module("AppTest",[]).provider("DataTester", function() {
    var _dummyData =  {
        java: 'lorem ipsum',
        ruby: 'ipsum lorem',
        python: 'lorem ipsum dolor sit amet'
    };
    this._publicData = {};
    this.setLanguage = function(x) {
      this._publicData = _dummyData[x];
    }
    var _self = this;
    this.$get = function () { //this method should return what factory does
        return {
           ....
           fetchData: function () {
               return _self.publicData;
        }
   }
});
angular.module("AppTest").config(function(DataTesterProvider)
    DataTesterProvider.setLanguage('java');
);

Hopefully, I grasped some of the essence of your inquiry... ;-)

Answer №3

Before doing anything else, ensure that the _fakeData object is moved outside the return block to allow your controller easy access to it.

var _fakeData = {
        javascript: 'blah blah',
        ruby: 'blah blah blah',
        python: 'blah blah blah blah'
};
return {
...
};

Next, consider using the module's constant method for defining the language:

var app = angular.module('testApp', []);
app.constant('language', 'javascript');

Then, inject the language into your factory, simplifying its structure:

app.factory('TestFactory', ['language', function(language) {
   var _fakeData = {
        javascript: 'blah blah',
        ruby: 'blah blah blah',
        python: 'blah blah blah blah'
   };
   return {
      getData: function() {
        return _fakeData[language];
      }
   };
}];

There's no longer a need for an init() method. Simply use the getData() method in your controller:

app.controller('TestCtrl', function($scope, TestFactory) {
   console.log(TestFactory.getData());
});

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