What is the best way to postpone the angular animation until after the model has been bound

Question

What is the best way to postpone the angular animation until after the model has been bound

I am currently working on a project using AngularJS where I am implementing animations for state transitions. To help with this process, I have been referring to the angular wiki and found this Plunker example:

http://plnkr.co/edit/NsZhDL?p=preview

My issue arises when animating between two <table> elements in different states. The animation (a slide right effect) works correctly, but it triggers before the data is loaded. This results in only the headers sliding in from the right initially, followed by the data being loaded into the <tr> rows. My controller includes an AJAX call to fetch the necessary data, which seems to be executing after the animation. Is there a way to ensure that the data is loaded prior to triggering the animation?

function CategoryList(/*dependencies*/) {
var controller = this;
//setup stuff

//get the data
$http.get('/My/Url', {
    headers: {
        ShowLoading: true
    }
}).success(function (data, status, headers, config) {
    controller.setCategories(data);
});

To address this issue, I attempted using the resolve property within my state object to retrieve the data first and return a promise, but encountered the same problem. Here is my attempt:

.state('myStateName', {
            url: '/myUrl/{id:int}',
            templateUrl: '/mytemplate.html',
            controller: 'ListController',
            controllerAs: 'List',
            resolve: {
                ajaxData: ['$q', '$http', '$stateParams', '$timeout',
                    function ($q, $http, $stateParams, $timeout) {
                        var deferred = $q.defer();
                        // $http returns a promise for the url data
                        $http.get('/Admin/Activities/Category/GetDetail/' + $stateParams.id, {
                            headers: {
                                ShowLoading: false
                            }
                        }).success(function (data) {
                            deferred.resolve(data);
                        }).error(function (data) {
                            deferred.reject();
                        });
                        return deferred.promise;
                    }]
            }

Even though the data retrieval is successful, the animation still precedes it. I had expected the resolve function to execute before instantiating the controller as per the information provided on the angular-ui wiki page: https://github.com/angular-ui/ui-router/wiki#resolve

edit Further research led me to believe that the AJAX request completes before the animation, but the model binding takes place afterwards. This appears to be the current sequence of events:

Click on state transition link
Resolve function retrieves data from server
Fetch destination state's template
Animate the new template into position ([ui-view]-enter yada yada)
Bind the new template to the model.

edit Upon further investigation, it turned out to be a CSS-related issue. The minimum height set on the parent div of the table was causing the tbody content to remain hidden until the animation was completed.

javascript ajax angularjs animation

Answer 1

Answer №1

Unfortunately, Plunker is currently experiencing technical difficulties. However, the following code snippet appears to be functional:

var myApp = angular.module('myApp', ["ui.router", "ngAnimate"]);

function resolveData(data) {
  return function ($timeout, $q) {
    var deferred = $q.defer();
    $timeout(function () {
      deferred.resolve(data);
    }, 500);
    return deferred.promise;
  };
}

myApp.config(function ($stateProvider, $urlRouterProvider) {
  $stateProvider
    .state("foo", {
      url: "/foo",
      template: '<h1>{{ info }}</h1>',
      controller: 'FooBarController',
      resolve: {
        info: resolveData('foo')
      }
    })
    .state("bar", {
      url: "/bar",
      template: '<h1>{{ info }}</h1>',
      controller: 'FooBarController',
      resolve: {
        info: resolveData('bar')
      }
    })

  $urlRouterProvider.otherwise("/foo");
});

myApp.controller('FooBarController', function ($scope, info) {
  $scope.info = info;
});

The animations take place once the data has been successfully resolved.

Answer 2

Unfortunately, Plunker is currently experiencing technical difficulties. However, the following code snippet appears to be functional:

var myApp = angular.module('myApp', ["ui.router", "ngAnimate"]);

function resolveData(data) {
  return function ($timeout, $q) {
    var deferred = $q.defer();
    $timeout(function () {
      deferred.resolve(data);
    }, 500);
    return deferred.promise;
  };
}

myApp.config(function ($stateProvider, $urlRouterProvider) {
  $stateProvider
    .state("foo", {
      url: "/foo",
      template: '<h1>{{ info }}</h1>',
      controller: 'FooBarController',
      resolve: {
        info: resolveData('foo')
      }
    })
    .state("bar", {
      url: "/bar",
      template: '<h1>{{ info }}</h1>',
      controller: 'FooBarController',
      resolve: {
        info: resolveData('bar')
      }
    })

  $urlRouterProvider.otherwise("/foo");
});

myApp.controller('FooBarController', function ($scope, info) {
  $scope.info = info;
});

The animations take place once the data has been successfully resolved.

Answer 3

Answer №2

Initially, I was baffled by the resolve function as it didn't seem to work correctly for me.

Below is the code snippet that I've implemented in my current project and it seems to be functioning properly...

var fetchData = ['$q','$http',
  function($q, $http) {
    var deferred = $q.defer();

    // You can initiate your animation code here, but its functionality is unclear.
    $http.get('url')
      .success(function(data) {
        // Once this point is reached, it indicates that you have obtained your data and the resolve will execute, enabling the state transition.
        // If you wish to trigger your animation at this moment, you would include it here
        deferred.resolve(data);
      }
      .error(function(data) {
        deferred.reject();
      }

    return deferred.promise;
  }]

I hope this explanation clears things up for you. Feel free to ask if you need further clarification.

To transfer the resolved data from the resolve function to your target state controller, simply inject it into your controller.

app.controller('someController', ['$scope', 'resolvedData',
  function($scope, resolvedData) {
    $scope.data = resolvedData // This is where your data resides
  }]);

For more information on using resolve in Angular UI Router, refer to the ui.router documentation.

Answer 4

Initially, I was baffled by the resolve function as it didn't seem to work correctly for me.

Below is the code snippet that I've implemented in my current project and it seems to be functioning properly...

var fetchData = ['$q','$http',
  function($q, $http) {
    var deferred = $q.defer();

    // You can initiate your animation code here, but its functionality is unclear.
    $http.get('url')
      .success(function(data) {
        // Once this point is reached, it indicates that you have obtained your data and the resolve will execute, enabling the state transition.
        // If you wish to trigger your animation at this moment, you would include it here
        deferred.resolve(data);
      }
      .error(function(data) {
        deferred.reject();
      }

    return deferred.promise;
  }]

I hope this explanation clears things up for you. Feel free to ask if you need further clarification.

To transfer the resolved data from the resolve function to your target state controller, simply inject it into your controller.

app.controller('someController', ['$scope', 'resolvedData',
  function($scope, resolvedData) {
    $scope.data = resolvedData // This is where your data resides
  }]);

For more information on using resolve in Angular UI Router, refer to the ui.router documentation.

What is the best way to postpone the angular animation until after the model has been bound

Answer №1

Answer №2

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