angular ui-router- ajax call on load - angularjs

Question

We are developing an single page application using angular JS and I am using state provider for configuring routes. Basically there is a global navigation view and a dashboard view. I have to pass few params from navigation to make a service call and then display the dashboard accordingly.I have split the states as two, one for navigation and other for dashboard. THe thing which i am not able to figure out is that where should i make ajax call to fetch dashboard data. Should i make it in navigation itself and pass it through resolve. or should i just pass the data to dashboard controller and make ajax call from there. Below is my state
$stateProvider
.state('home', {
url: '/',
templateUrl: 'templates/home.htm',
controller: 'homeController',
})
.state('dashboard', {
url: 'contact',
templateUrl: 'templates/dashboard.htm',
controller: 'dashboardController'
})
.state('state3', {
url: '/articles',
templateUrl: 'templates/state3.htm',
controller: 'state3Controller'
});
$urlRouterProvider.otherwise('/home');

Answer 1

This entirely depends on how you want the user experience to play out.
If you want to do all the data fetching before transitioning to the dashboard state, use a resolve state configuration
.state('dashboard', {
url: '/contact',
templateUrl: 'templates/dashboard.htm',
controller: 'dashboardController',
resolve: {
someData: function($http) {
return $http.get('something').then(res => res.data);
}
}
}
then your controller can be injected with someData, eg
.controller('dashboardController', function($scope, someData) { ... })
This will cause the state transition to wait until the someName promise has been resolved meaning the data is available right away in the controller.
If however you want to immediately transition to the dashboard state (and maybe show a loading message, spinner, etc), you would move the data fetching to the controller
.controller('dashboardController', function($scope, $http) {
$scope.loading = true; // just an example
$http.get('something').then(res => {
$scope.loading = false;
$scope.data = res.data;
});
})