Ajax read json console warning

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I have the following ajax call:

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

and produces the following error:

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://ift.tt/ZyN3LX.

But the json data is returned to my employeeData variable and I can access all of the properties within the object.

However, If I don't set async to false, which sets the default to true nothing is returned to my employeeData variable and is null yet the warning is gone.

asked 52 secs ago

Miura-shi

590

Ajax read json console warning