I am unable to send back my JSON object

I seem to be having trouble returning a JSON object as all I get is an undefined variable.

The code below is supposed to fetch a JSON element from an API. It appears to work within the success: function, but when attempting to use that data elsewhere, it just shows 'undefined.'

var datas;
datas = fetchData();
//fetchData();
generateChart(datas)

alert('2datass' + datas); // this results in undefined

function generateChart(data){
    alert(data); //outputs as undefined
}

function fetchData(){
    alert('ajax');
    $.ajax({
        type: "GET",
        dataType: "json",
        url: "API URL",
        success: function(data){

            alert(data); // WORKS! and outputs my JSON data
            
            return jQuery.parseJSON(data);
            return data;
        }
    });
};

Any assistance would be greatly appreciated.

SOLUTION

Appreciation for everyone's help.

This seems to resolve the issue


        var datas;
        datas = obtainData();
        
        alert('2datass' + datas);
        console.log(datas);
        createChart(datas);


        function createChart(data){

            alert('createChart' + data);
            var dynamicData;

            for(var i = 0; i <= data.length-1; i++){
                var item = data[i];

                dynamicData = dynamicData + {
                    type: 'column',
                    name: item.name,
                    data: [item.difference]
                };
            }

            alert('dynamic' + dynamicData);

            var series = [dynamicData,{
                    type: 'column',
                    name: 'Jane',
                    data: [300, 30]
                }, {
                    type: 'column',
                    name: 'John',
                    data: [-200, 50]
                }];

            var options = {
                chart: {
                    renderTo: 'container'
                },
                title: {
                    text: 'Account Managers Leaderboard'
                },
                xAxis: {
                    categories: ['Month on Month', 'Day on Day']
                }
                // similar configurations...
            };

            $(document).ready(function() {
                var chart;
                chart = new Highcharts.Chart(options);
            });

        }



       function getData(){
            //alert('ajax');

            var receivedData;
            $.ajax({
                type: "GET",
                dataType: "json",
                url: "API URL",
                async: false,
                success: function(data){
                    alert('data' + data);
                    receivedData = data;
                }
            }); 

            return receivedData;
        };

Answer №1

By default, AJAX calls operate asynchronously. To retrieve the response from an AJAX call, use the following method:

function fetchData() {
    return $.ajax({ 
        type: "GET",
        dataType: "json",
        url: "API URL",
        async: false // TAKE NOTE OF THIS
    }).responseText; // ALSO CONSIDER THIS
};

It is uncertain whether the responseText will be in parsed or unparsed JSON format, so analyze the result accordingly.

Answer №2

The issue here is that you are returning from the success function instead of your getdataaa function. Since getdataaa does not have a return statement, it defaults to returning undefined. A return statement pertains to the closest function.

success: function(data){
   alert(data); // It works! and displays my JSON data
   ...
   //Both of these return statements do not seem to be effective
   return jQuery.parseJSON(data);
   return data;
}

This is the outcome you are experiencing. To obtain your desired result, you can utilize a closure like this:

function getdataaa(){
    alert('ajax');

    var receivedData; // store your value here
    $.ajax({
        type: "GET",
        dataType: "json",
        url: "API URL",
        async: false,
        success: function(data){

            alert(data);

            // ...

            receivedData = data;
        }
    });

    return receivedData;
};

Answer №3

Instead of:

 utilize jQuery.parseJSON(data);

OR

 utilize the data directly;

initiate the createChart function directly:

execute createChart(data)

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