Parsing JSON string returns null

Question

I'm quite new to JSON handling and I've got myself stuck. My page contains the following script;

<script type="text/javascript">



$(document).ready(function() {

    $('#progressBar').progressbar({value: 0.0});


    process();
});
    function process() {

        getStatus();
        setInterval(getStatus,1000);
    }

    function getStatus() {
        $.getJSON('status-report', function(data) {
            var statusBean = $.parseJSON(data);
              $('#progressBar').progressbar('option','value',$.trim(statusBean.percentComplete));
            $('#status').html(statusBean.statusDescription);
        });
    }


</script>

Using Firebug, I can see that the call to 'status-report' is returning a JSON string

{"statusBean":{"percentComplete":50.0,"statusDescription":"Default Description"}}

but after $.parseJSON, Firebug shows me that the variable statusBean is null.

What am I doing wrong?

data is already a JavaScript object. getJSON parses the response for you. It is described in the documentation: "The success callback is passed the returned data, which is typically a JavaScript object or array as defined by the JSON structure and parsed using the $.parseJSON() method.". — Felix Kling
– Felix Kling, Commented Dec 20, 2011 at 12:31

David Hedlund · Accepted Answer · 2011-12-20 12:31:33Z

3

The value of data as passed to the getJSON callback, will already be a JS object. $.parseJSON will return null when an object is passed to it, as it expects a string. The call to $.parseJSON can simply be removed here, since getJSON assumes JSON in the first place.

answered Dec 20, 2011 at 12:31

David Hedlund

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