Unable to access the 'data' property because it is undefined in AngularJS, making it impossible to retrieve data from the template to the controller

I am new to angularjs and still learning its intricacies. Currently, I am facing an issue where I can't seem to find a simple solution. I hope someone can assist me with this.

Here is the folder structure that I have created:


Select
->SelectModule.js
->SelectDirective.js
->SelectController.js
->SelectTemplate.html

In each file, here are the contents:

SelectModule.js


angular.module('Select', []);

SelectDirective.js


'use strict';
angular.module('Select').directive('Select', Select);
function Select() {
return {
    transclude: false,
    scope: {

    },
    controller: 'SelectController',
    templateUrl: 'app/directives/Select/SelectTemplate.html'
};
};

SelectController.js


'use strict'
var SelectMod = angular.module('Select', []);
SelectMod.controller('SelectController', function ($scope) {

console.log($scope.details.data);
});

SelectTemplate.html


<section ng-controller="SelectController">
<div><label>Data:</label><div><input type="number" ng-model="details.data" ng-init="details.data=0.2" step="0.1" /></div></div>
</section>

In the template, I have initialized details.data=0.2. However, when I try to access this initialized data in the controller, there is an error stating "Cannot read property 'data' of undefined." Can anyone help me figure out how to retrieve this value in the controller? I am stuck at this point and any suggestions or advice would be greatly appreciated.

Answer №1

The main reason lies in the fact that the controller must execute first before rendering the view, and not vice versa.

Therefore, when attempting to log the data, it may not yet be available.

Avoid utilizing ng-init for this particular task. The documentation for ng-init explicitly cautions against using it in this manner.

It is recommended to initialize variables within the controller logic.

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