How Can AngularJS Prevent Route Change Flicker by Delaying Until Data Loads?

Delaying AngularJS Route Change Until Data Loaded to Prevent Flicker

In AngularJS, abruptly changing routes can sometimes cause a flicker when the new page loads. To address this, we can delay showing the new route until after all necessary data has been retrieved.

Problem: How can AngularJS be configured to wait until models and data are fully loaded before displaying a new route, similar to the way Gmail operates?

Solution:

To prevent flickering, AngularJS provides the resolve property within routes. By defining a resolve function, we can specify which dependencies need to be resolved before proceeding with the route change.

Consider the following example:

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

PhoneListCtrl.resolve = {
  phones: function(Phone, $q) {
    var deferred = $q.defer();
    Phone.query(function(successData) {
      deferred.resolve(successData);
    }, function(errorData) {
      deferred.reject();
    });
    return deferred.promise;
  }
};

In this example, we define a resolve function for the PhoneListCtrl that returns a promise for the phone data. Once the promise is resolved, the data becomes available to the controller.

Configuring the route in the AngularJS application:

angular.module('phonecat').config(['$routeProvider', function($routeProvider) {
  $routeProvider.
    when('/phones', {
      templateUrl: 'partials/phone-list.html',
      controller: PhoneListCtrl,
      resolve: PhoneListCtrl.resolve
    });
}]);

By using the resolve property, AngularJS delays the route change until the phones promise is resolved, ensuring that the data is loaded before the new page is displayed. This approach prevents any flicker during the page transition.

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