when i console getjson() it returns undefined

Question

I am new to javascript. I want to store Json data in function getjsonData. I have Created a private function retrieveJsonData and I am passing it through getJsonData. but i can't access json outside onload function.

var DataController = (function(){
        var retrieveJsonData = function(){
            var api,ourRequest;
            api = 'http://52.69.49.40/assignment/getServiceData.php';
            ourRequest =  new XMLHttpRequest();
            ourRequest.open('GET',api);
            ourRequest.onload = function(){
                obj = JSON.parse(ourRequest.responseText);
                getJsonData(obj);
            }   
            ourRequest.send();
        }


        var getJsonData = function(object){
            return object;
        }

        return{
            AjaxObject:function(){
                getJsonData();
                console.log(getJsonData());
            }
        }


    })();

Functions do not store data within themselves – Patrick Evans Apr 06 '18 at 15:41 — Patrick Evans, Apr 06 '18 at 15:41

score 1 · Answer 1 · answered Apr 06 '18 at 15:46

Your getJsonData takes one parameter, and returns the value of that parameter. It is something called the "identity function", which does absolutely nothing. You probably want to store that data somewhere, which you can do by replacing your function with:

var data = undefined;
function getJsonData() {
  if (arguments.length > 0) {
    data = arguments[0];
  }
  return data;
}

It isn't a very good function, though, because it doesn't do what it says on the tin. It claims to get the JSON data, but it also stores it.

when i console getjson() it returns undefined

1 Answers1