JScript JSON Array access

I have a JSON array stored in a file data.json - I used the code that was recommended here for a similar problem, explain why when I try to access the array later in the program it tells me it is undefined.

    var chartData = (function () {
                var chartData = null;
                $.ajax({
                    'async': false,
                    'global': false,
                    'url': "data.json",
                    'dataType': "json",
                    'success': function (data) {
                        chartData = data;
                    }
             });
             return chartData;
        })();

Help appreciated!

Edit; For accessing, I'm using the array as a series in dojo-chart: http://dojotoolkit.org/grids-charts

After I attempt to initial开发者_如何转开发ize var chartData, the only other point I use it is in:

    chart.addSeries("Name",chartData);

Edit #2; In case it matters the data.json file is formatted like:

    [#, #, #, ... , #]

Perhaps because it was not successful? I found it very useful to debug using console.log (firebug, or most modern web developer panels in chrome or ie support it)

you can try this piece of code to debug it.

var chartData = (function () {
            var chartData = null;
            $.ajax({
                'async': false,
                'global': false,
                'url': "data.json",
                'dataType': "json",
                'success': function (data) {
                    console.log('success');
                    console.log(data);
                    chartData = data;
                }
                error: function (data) { console.log('error'); console.log(data); },
         });
         return chartData;
})();

I guess it should work somehow as you set async: false. But better is to use it asynchronously:

function handler(chartData) {
    // all the code here that deals with chartData
}

$.ajax({
    url: "data.json",
    dataType: "json",
    success: handler
});