AngularJS throws an error when trying to access a property 'selection' that is undefined

I am encountering issues with connecting the inputs of my form to a specific factory that I have injected into the controller responsible for rendering the form. Below is the code snippet for my factory:

App.factory('DeviceSelection',function() {
   var states=[{selection:{}},{selection:{}},{selection:{}},{selection:{}}];
   return states;
});

Here is an example input from my form:


<div class="controls">
    <label class="radio">
        <input type="radio" name="user[role]" id="user_role_managing_editor" value="Managing editor" ng-model='states[0].selection.hours'>
        Yes 
    </label>
    <label class="radio">
        <input type="radio" name="user[role]" id="user_role_area_editor" value="Area editor", ng-model='states[0].selection.hours'>
        No 
    </label>
</div>

When attempting to interact with this radio input, I receive the following error in the JS Console:

TypeError: Cannot read property 'selection' of undefined

Does this imply that I need to initialize the model before the view is rendered? If so, where should this initialization occur?

My objective is to create a multi-step form where all the inputs are linked to the model, with the final step involving sending the results to an API. This concept was previously discussed here:

Store status between forms in AngularJS?

Answer №1

You mention that you have implemented injection in your controller. While it would be helpful to see how that injection is set up, I will take a guess at what might be causing the issue:

It seems like you may have something similar to this setup:

YourApp.controller('YourController', ['$scope', 'YourFactory', function ($scope,$yourFactory) {
...

However, have you assigned that injection to the $scope? Without doing so, the view will not have access to it :)

If not, try adding this line:

 $scope.states=$yourFactory;

My suspicion is that this step may have been missed. The controller must communicate to the view where to locate that state array via the $scope

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