Unusual behavior in AngularJS: ng-change event not triggering

I have set the ng-change directive in a select element within my form, but for some reason, the associated function is not being called when I change the value. I have tried various solutions from similar questions but none have been effective so far.

Can you pinpoint what I might be doing incorrectly?

This is my HTML code:

<div class="row" ng-app="quoteApp">

    <div class="col-lg-12" ng-controller="QuoteController" ng-init="initialize()">
        <h1 class="page-header">Quote</h1>

                <div class="form-group">
                    <label>Carrier</label>
                    <select class="form-control" ng-model="form_carrier_id" ng-change="loadProducts()">
                        <option ng-repeat="carrier in carriers" value="{{carrier.id}}">{[{carrier.name}]}</option>
                    </select>
                </div>

                <div class="form-group">
                    <label>Product</label>
                    <select class="form-control" ng-model="form_product_id">
                        <option value=""></option>
                        <option ng-repeat="product in products" value="{{product.id}}">{[{product.name}]}</option>
                    </select>
                </div>

    </div>

</div>

This is my controller:

angular.module('quoteApp', ['angular-loading-bar']).config(function($interpolateProvider){
    $interpolateProvider.startSymbol('{[{').endSymbol('}]}');
})
    .controller('QuoteController', function ($scope, $http) {

        $scope.carriers = [];
        $scope.products = [];
        $scope.form_carrier_id = '';
        $scope.form_product_id = '';

        $scope.getUrl = function(action){return '/admin/application/quote/json?action='+ action;}

        $scope.initialize = function(){

            // Get the list of carriers
            $http.get($scope.getUrl('getCarriers'))
                .success(function (data) {
                    $scope.carriers = data;
                })
                .error(function () {
                    alert('Error loading carriers');
                });
        }

        $scope.loadProducts = function(){
            alert('HERE');
        }
    });

Everything seems correct to me. Can you identify what I may have overlooked? The first select element loads as expected, but the issue arises when I change its value, as the loadProducts function fails to trigger.

Thank you.

Answer №1

While this may not be the root of the issue, it's recommended to utilize ng-options instead of <option ng-repeat>. Previous experiences have shown strange behavior stemming from using the latter.

Answer №2

After some investigation, I identified the issue. The problem was with how I was populating the select element. It should be populated in the following manner:

            <select class="form-control" ng-model="form_carrier_id"
                    ng-options='carrier.id as carrier.name for carrier in carriers'
                    ng-change="loadProducts()">
            </select>

Answer №3

To enhance the functionality of your select dropdown, consider implementing ng-options to populate the products dynamically.

<select class="form-control" ng-model="selectedProduct"
                ng-options="product.id as product.name for product in availableProducts" ng-change="updateProduct()">
                    <option value="">Select product</option>
                </select>

By using ng-options, the selected product will automatically trigger an update in the system, ensuring seamless integration with the rest of the application.

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