Question

我正在使用角度js mvc ie。用户界面，控制器和服务。我编写了一个代码，用于检查数据库中是否存在同名组织。为此，我写了一个AJAX调用。如果名称存在于数据库中，则返回我，或者不是以＆＃39; 0＆＃39;或者＆＃39; 1＆＃39;。即＆＃39; 1＆＃39;目前和＆＃39; 0＆＃39;缺席。我在控制器中检查这个响应，然后如果响应是一个，我将返回false给调用函数，但即使一切正常，我仍然可以看到变量值为＆＃39; undefined＆＃39;。以下是代码：

控制器：

     $scope.checkOrgName = function(){
         console.log("We are checking id organization name "+$scope.organization.orgName+" is already present in the database or not");
         if($scope.organization.orgName != ""){
             OrganizationService.checkOrgName($scope.organization.orgName).then(
                     function(data){
                         var dbOrgName = data;
                         if(dbOrgName==1){
                           (Command comes here and shows the following alert box on the UI)
                             $scope.failureAlertMessage("This organization name is already present, enter some other name");
                             $scope.organization.orgName = "";
                             return false;(here I am returning false)
                         }
                         else if(dbOrgName==0){
                             console.log("Organization name is available");
                             return true;
                         }
                     },
                     function(errResponse){
                         $scope.failureAlertMessage("Error while checking organization name in the database");
                     }
             );
         }else{
             console.log("No need for the organization name checking, name empty");
         }


     }

调用函数（仅限控制器内）

(Here I am calling the above function)
         $scope.orgNameStatus = $scope.checkOrgName();
         console.log("$scope.orgNameStatus: "+$scope.orgNameStatus);(This line prints 'undefined')
          if($scope.orgNameStatus == false){
              return false;
          }

浏览器控制台：

Inside addOrganization
organization_controller.js:51 We are checking id organization name dsd is already present in the database or not
organization_service.js:25 In service: check org name
organization_controller.js:171 $scope.orgNameStatus: undefined
organization_controller.js:217 Validation status: true
organization_controller.js:59 Command in dbOrgName==1

代码有什么问题。请帮帮我，谢谢。!!

Answer 1

$scope.orgNameStatus未定义的原因是您的函数$scope.checkOrgName未返回任何值。在函数的then回调中只有一个return语句。

在任何情况下，由于该函数是异步的，它只会返回一个 Promise ，您可以再次注册一个回调。在继续处理之前，您需要确保请求已完成。

<强>控制器

 $scope.checkOrgName = function(){
     console.log("We are checking id organization name "+$scope.organization.orgName+" is already present in the database or not");
     if($scope.organization.orgName != ""){
// added return statement to return promise
         return OrganizationService.checkOrgName($scope.organization.orgName).then(
                 function(data){
                     var dbOrgName = data;
                     if(dbOrgName==1){
                       (Command comes here and shows the following alert box on the UI)
                         $scope.failureAlertMessage("This organization name is already present, enter some other name");
                         $scope.organization.orgName = "";
                         return false;(here I am returning false)
                     }
                     else if(dbOrgName==0){
                         console.log("Organization name is available");
                         return true;
                     }
                 },
                 function(errResponse){
                     $scope.failureAlertMessage("Error while checking organization name in the database");
                 }
         );
     }else{
         console.log("No need for the organization name checking, name empty");
     }


 }

调用功能

$scope.checkOrgName().then(function(status) {
    $scope.orgNameStatus = status; // now the request is complete and we can assign the status to the scope variable
         console.log("$scope.orgNameStatus: "+$scope.orgNameStatus);(This line prints 'undefined')
          if($scope.orgNameStatus == false){
              return false;
          }
});

程序流在angularjs

1 个答案: