Javascript Anonymous JSON Retrieval (WIP)

function loadJSON(callback)
{
    var xobj = new XMLHttpRequest();
    xobj.overrideMimeType("application/json");
    xobj.open('GET', 'http://someurl', true);
    xobj.onreadystatechange =
        function () {
            if (xobj.readyState == 4 && xobj.status == "200") {
                callback(xobj.responseText);
            }
        };
    xobj.send(null);
 }

 function requestJSON()
{
    loadJSON(
        function(response) {
            data = JSON.parse(response);
        }
    );
}

$(document).on("click", "a", function()
    {
        //this == the link that was clicked
        var href = $(this).attr("href");
        var href_id = $(this).attr("id");
        if (href_id == "getdata")
        {
            loadJSON(function(response)
            {
                var div_showdata = document.getElementById('showdata');
                div_showdata.innerHTML = "Data";

                var content = "<ul class='box3'>";
                // Parse JSON string into object
                data = JSON.parse(response);

                for (var key in data)
                {
                    content += ("<li>" + key + " : " + data[key] + "</li>");
                }
                content += "</ul>";

                //var first = "Some text";
                //var test_output = "<p>" + first + "</p>";
                div_showdata = document.getElementById('showdata');
                div_showdata.innerHTML = content;
            });
            console.log("You've clicked link:" + href);
        }
    }
);