How Can I Prevent Flickering During AngularJS Route Transitions When Fetching Data?

Delaying AngularJS Route Change for Data Fetching

AngularJS offers a solution to prevent flickering during route transitions when models require data fetching. This technique, analogous to Gmail's behavior, allows you to delay displaying a new route until the necessary model data has been retrieved.

Resolve Property of $routeProvider

The key feature for delaying route changes is the resolve property associated with $routeProvider. By defining a route with a resolve attribute, you specify that data needs to be fetched before the route can transition.

Example

Consider the following example:

// Define a route with a resolve property
$routeProvider.when('/phones', {
    templateUrl: 'partials/phone-list.html', 
    controller: PhoneListCtrl, 
    resolve: PhoneListCtrl.resolve
});

The resolve attribute refers to an object where you define functions to fetch the data. For instance:

function PhoneListCtrl($scope, phones) {
    $scope.phones = phones;
    $scope.orderProp = 'age';
}

PhoneListCtrl.resolve = {
    phones: function(Phone, $q) {
        // Deferred object for promise handling
        var deferred = $q.defer();
        
        // Fetch data via Phone service
        Phone.query(function(successData) {
            deferred.resolve(successData); 
        }, function(errorData) {
            deferred.reject(); // Optionally handle errors
        });
        
        return deferred.promise;
    }
}

Deferred Promises

Promises are used to represent the asynchronous data fetching process. Each resolve function returns a promise, and AngularJS collects all these promises. The route change is delayed until all promises are resolved, ensuring that the data is ready before displaying the new view.

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