Input values in Angular are not being updated according to the corresponding model values

My Angular application features two routes that share the same controller and partials. Despite the shared code, the controller and partials behave slightly differently depending on the route being used. Here are the routes:

$routeProvider.when('/join', {templateUrl: '/partials/global-shared/join.html', controller: HouseJoinController});
$routeProvider.when('/join/:code', {templateUrl: '/partials/global-shared/join.html', controller: HouseJoinController});

Within the controller, I am checking if a code is provided, making an API call, and updating a model based on the API response:

if ($routeParams.code) {
    API.post('signUp', 'invitedClient', 'getTenantDetails', {code: $routeParams.code}, function(result) {
        $scope.firstName = result.client.firstName;
    });
}

Additionally, the partial contains an input element that is linked to $scope.firstName through ng-model:

<input type="text" name="firstName" ng-model="firstName" ng-pattern="/^[a-zA-Z-']+[ ]?[a-zA-Z-']+$/" required>

Upon loading the page with a supplied code, I can see the API call and its results in Chrome's developer tools. I have also confirmed that $scope.firstName is updated with the API result by utilizing console.log().

Despite this, the input element does not reflect the updated model. Strangely, if I include {{ firstName }} just before the input element, the correct firstName model is displayed.

After trying to use $scope.$apply() within the API callback function as shown below:

if ($routeParams.code) {
    API.post('signUp', 'invitedClient', 'getTenantDetails', {code: $routeParams.code}, function(result) {
        $scope.$apply(function() {
            $scope.firstName = result.client.firstName;
        });
    });
}

Angular throws an error stating: Error: [$rootScope:inprog].

Answer №1

It seems like the issue at hand is related to javascript prototypal inheritance. My suggestion is to store your property within an object in the $scope. For a more detailed explanation, please refer to this documentation. Here's a summary:

To avoid problems with primitives, it is recommended to always include a '.' in your ng-models - watch Misko's 3-minute demo on the issue with primitive binding in ng-switch.

By including a '.', you will ensure the proper functioning of prototypal inheritance. Therefore, use

<input type="text" ng-model="someObj.prop1">
instead of
<input type="text" ng-model="prop1">
.

Answer №2

Can you explain what API is?

When using a service other than Angular's $http, Angular cannot detect any asynchronous updates to your model.

As a result, you may not need to use $apply() if you:

  • utilize the $http service
  • implement $q in your API.post method to handle the response

Another approach is to structure your $apply in this manner (as per the documentation, the scope is passed into the function):

$scope.$apply(function(scope) {
  scope.firstName = result.client.firstName;
});

Furthermore, it is recommended to use instance objects on $scope rather than primitives to prevent $scope inheritance issues:

$scope.client = receivedClient;

and

ng-model="client.firstName"

where applicable

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