JavaScript Variable Displaying an Undefined Value

I'm facing an issue with a global JavaScript array. At the beginning of the function, I can successfully call values from it. However, as the function progresses, when I try to alert leaders[i], it shows up as undefined: It seems like the problem arises when there are nested AJAX calls within each other, causing JS to not find the values in the array.

JS

function accessLeaders(bool) {
    var leaders = new Array();
    leaders.push('444');
    leaders.push('111');
    $.ajax({
        url: 'url',
        crossDomain: true,
        type: 'post',
        data: {
            'clubID': curClub
        },
        success: function (data) {
              for (var i = 0; i < leaders.length; i++)
              {
                  alert(leaders[i]); <===== This works fine here
                  $.ajax({
                       url: 'someurl',
                       crossDomain: true,
                       type: 'post',
                       data: {
                           'id': leaders[i] <====== This works fine here
                       },
                       success: function(data3) {
                           alert(leaders[i]);      <======= This is undefined here
                           var json3 = jQuery.parseJSON(data3);
                       }
                });
            }
           }
      });
     };

Answer №1

Because the call is asynchronous, the value of "i" is most likely greater than leader.length by the time the call finishes. This means you are likely trying to access an index that does not exist.

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