javascript - Angular js - detect when all $http() have finished

Question

Ok i have tons of $http() calls all around the app code,

i'm wondering is there any way / best practice to detect when all $http() around the app have finished ( success/error donesn't matter what they return, just need to know if finished )?

So that i can show a loading gif until they are loading ?

thanks

Answer 1

Do it like this:

angular.module('app').factory('httpInterceptor', ['$q', '$rootScope',
    function ($q, $rootScope) {
        var loadingCount = 0;

        return {
            request: function (config) {
                if(++loadingCount === 1) $rootScope.$broadcast('loading:progress');
                return config || $q.when(config);
            },

            response: function (response) {
                if(--loadingCount === 0) $rootScope.$broadcast('loading:finish');
                return response || $q.when(response);
            },

            responseError: function (response) {
                if(--loadingCount === 0) $rootScope.$broadcast('loading:finish');
                return $q.reject(response);
            }
        };
    }
]).config(['$httpProvider', function ($httpProvider) {
    $httpProvider.interceptors.push('httpInterceptor');
}]);

Then use event bound to $rootScope anywhere (preferable to use in directive):

$rootScope.$on('loading:progress', function (){
    // show loading gif
});

$rootScope.$on('loading:finish', function (){
    // hide loading gif
});