Explanation of asynchronous data loading in AngularJS -

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below example code in controller 2 console.log instructions. after accessing page in browser, list of users appears, displayed well. result of console.log :

the first one: after loadall() function call = 0

the second one: end of loadall() function = 8

angular.module('tessicommunicationapp') .controller('usermanagementcontroller', ['$scope', '$filter', '$log', 'principal', 'user', 'parselinks', 'language', 'ngtableparams', function ($scope, $filter, $log, principal, user, parselinks, language, ngtableparams) {             $scope.users = [];             $scope.authorities = ["role_user", "role_admin", "role_tc_admin", "role_tc_ges_adm", "role_tc_sui_tra", "role_tc_cons"];             language.getall().then(function (languages) {                 $scope.languages = languages;             });              principal.identity().then(function (account) {                 $scope.currentaccount = account;             });             $scope.page = 1;             $scope.loadall = function () {                 user.query({                     page : $scope.page - 1,                     size : 20                 }, function (result, headers) {                     $scope.links = parselinks.parse(headers('link'));                     $scope.totalitems = headers('x-total-count');                     $scope.users = result;                     console.log("end of loadall() function = " + $scope.users.length);                 });             };              $scope.loadpage = function (page) {                 $scope.page = page;                 $scope.loadall();             };             $scope.loadall();             console.log("after loadall() function call = " + $scope.users.length);         }     ]);

my question simple : why first 1 log print "0" whereas loadall() method called before.

because call asynchronous, in case means $scope.users.lenghthas not yet been populated when first log length (console.log("after loadall() function call = " + $scope.users.length);). in "callback-function", when data has been fetched in $scope.loadall() have recieved data , $scope.users has been populated.

simply put, code executed directly after calling $scope.loadall(), , not wait finish before running next line console.log("after loadall() function call = " + $scope.users.length);


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