How Can I Prevent Page Flicker During AngularJS Route Changes?

Delaying AngularJS Route Change to Prevent Page Flicker

When navigating between pages in an AngularJS application, sometimes it's desirable to delay the display of the new page until specific models or data have been loaded. This prevents flicker and ensures a smoother user experience.

Using the $routeProvider.resolve Property

The $routeProvider.resolve property allows you to define functions that must be resolved before a route change can occur. These functions can be used to load models, fetch data, or perform any other asynchronous actions necessary to prepare the new page.

angular.module('myApp', []).
  config(['$routeProvider', function($routeProvider) {
    $routeProvider.
      when('/myRoute', {
        templateUrl: 'my-route.html',
        controller: 'MyController',
        resolve: MyController.resolve
      })
  }]);

Defining the Resolve Function

The resolve function is a function that returns a promise. The promise represents the asynchronous action that must be completed before the router will allow the route change to occur.

function MyController($scope, myDataService) {
  $scope.myData = myDataService.getData();
}

MyController.resolve = {
  myData: function(myDataService, $q) {
    var deferred = $q.defer();
    myDataService.getData(function(data) {
      deferred.resolve(data);
    });
    return deferred.promise;
  }
};

In this example, the resolve function uses the myDataService to retrieve data. Once the data is received, the promise is resolved and the router is notified that the route change can proceed.

By delaying route changes until data is loaded, you can improve the user experience by avoiding page flicker and ensuring that all necessary data is available before the new page is displayed.

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