jquery - How to execute code synchronously in angular js -


i facing 1 issue service getting data service , binding ui, text box , drop down there passing model ui binding properly.

issue drop down working asynchronously (its guess). please check below code 

vendorservice.getvendordetailsforvendor().then(function(vendordetails) {             if (vendordetails.id !== 0) {                  $scope.businesstype = vendordetails.businesstypeid;                 $scope.vendortype = vendordetails.vendortypeid;                 $scope.category = vendordetails.shopcategory;                 $scope.discountunit = vendordetails.discountunitid;                 $scope.selectedstate = vendordetails.stateid;                 $scope.selectedcityid = vendordetails.cityid;                   if ($scope.businesstype != null) {                     $scope.$apply(function() {                         (var = 0; < $scope.businesstypelist.data.length; i++) {                             if ($scope.businesstypelist.data[i].businesstypeid === $scope.businesstype) {                                 $scope.businesstype = + 1;                             }                         }                     });                 }                  if ($scope.vendortype != null) {                     $scope.$apply(function() {                         (var = 0; < $scope.vendortypelist.data.length; i++) {                             if ($scope.vendortypelist.data[i].vendortypeid === $scope.vendortype) {                                 $scope.vendortype = + 1;                              }                         }                     });                 }                  if ($scope.category != null) {                     console.log($scope.category);                     $scope.$apply(function() {                         (var = 0; < $scope.categorylist.data.length; i++) {                             if ($scope.categorylist.data[i].shopname === $scope.category) {                                 $scope.category = + 1;                             }                         }                     });                 }                   if ($scope.discountunit != null) {                     $scope.$apply(function() {                         (var = 0; < $scope.discountunitlist.data.length; i++) {                             if ($scope.discountunitlist.data[i].discountunitid === $scope.discountunit) {                                 $scope.discountunit = + 1;                              }                         }                     });                 }                  if ($scope.selectedstate != null) {                     $scope.$apply(function() {                         (var = 0; < $scope.statelist.data.length; i++) {                             if ($scope.statelist.data[i].id === $scope.selectedstate) {                                 $scope.selectedstate = + 1;                              }                         }                     });                 }                  if ($scope.selectedcityid != null && $scope.selectedstate != undefined) {                     $scope.$apply(function() {                         vendorservice.getcity($scope.selectedstate).then(function(citylist) {                             $scope.citylist = {};                             $scope.citylist.data = citylist;                             (var = 0; < $scope.citylist.data.length; i++) {                                 if ($scope.citylist.data[i].id === $scope.selectedcityid) {                                     $scope.selectedcity = $scope.selectedcityid;                                 }                             }                         }, function() {                             alert("error while fetching server");                         });                     });                 }                 $scope.$apply(function() {                     $scope.inputdata = vendordetails;                 });                      $scope.loading = false;             }         }, function() {             alert("error while fetching server");         });

i getting error in chrome console

error : cannot read property 'data' of undefined

you should check if there defined, not if it's different null. this:

// returns true if value (object, array, number bigger 0, ...) // returns false if falsy value (0, '', undefined, null)  if ($scope.category) {     // ... code }

here cool link explains this.


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