Unidentified variable in Angular Ajax function when accessed outside its scope

Currently, I am in the process of creating a ticket admin table. However, I am facing some challenges with exporting a variable outside of an ajax function.

Here is my code:

app.controller('bodyController',function($scope,$http,$sce){
$scope.ticketList = [];
$http.get("tickets.php")
.then(function(response) {
   $scope.ticketModify = response.data;
    console.log($scope.ticketModify); //this one return the correct data.
    return $scope.ticketModify;
});
console.log($scope.ticketModify); //this return undefine

I encountered the same issue when using factory to attempt to store the response.data in a variable.

Answer №1

Simply because code is written before other code doesn't guarantee it will be executed first in a program. Consider the following analogy:

app.controller('bodyController',function($scope,$http,$sce){
$scope.ticketList = [];
$http.get("tickets.php")
   .then(handleResponse);
console.log($scope.ticketModify); //this returns undefined

function handleResponse(response) {
    $scope.ticketModify = response.data;
    console.log($scope.ticketModify); //this now returns the correct data
    return $scope.ticketModify;
}

Now do you understand why $scope.ticketModify remains undefined? The order of code placement is not crucial, rather the timing of execution is key. If you wish to further manipulate the updated $scope.ticketModify, consider chaining another then after the existing one, or pass $scope.ticketModify to another function from the current then. The possibilities are endless!

Answer №3

app.controller('bodyController', function($scope, $http, $sce) {
      $scope.ticketList = [];
      $scope.ticketModify = "";
      $http.get("tickets.php")
        .then(function(response) {
          $scope.ticketModify = response.data;
          console.log($scope.ticketModify);
          return $scope.ticketModify;
        });
      console.log($scope.ticketModify);
      // This should print an empty String
    }

If the code is working fine for you, it means that after the call to tickets.php returns a response.

However, if you are encountering issues, it's likely because the ticketModify variable is not defined when you try to access it. The reason for this is that you make the call to tickets.php asynchronously and immediately attempt to access the variable before it has been populated.

To address this issue, declare the ticketModify variable on the scope before making the http call to tickets.php. Then, update the value of ticketModify in the success/then callback of the tickets.php request.

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