jQuery UI DatePicker to show month year only

This code is working flawlessly to me:

<script type="text/javascript">
$(document).ready(function()
{   
    $(".monthPicker").datepicker({
        dateFormat: 'MM yy',
        changeMonth: true,
        changeYear: true,
        showButtonPanel: true,

        onClose: function(dateText, inst) {
            var month = $("#ui-datepicker-div .ui-datepicker-month :selected").val();
            var year = $("#ui-datepicker-div .ui-datepicker-year :selected").val();
            $(this).val($.datepicker.formatDate('MM yy', new Date(year, month, 1)));
        }
    });

    $(".monthPicker").focus(function () {
        $(".ui-datepicker-calendar").hide();
        $("#ui-datepicker-div").position({
            my: "center top",
            at: "center bottom",
            of: $(this)
        });
    });
});
</script>

<label for="month">Month: </label>
<input type="text" id="month" name="month" class="monthPicker" />

Output is:

enter image description here


Here's a hack (updated with entire .html file):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.js"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js"></script>
    <link rel="stylesheet" type="text/css" media="screen" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/base/jquery-ui.css">
    <script type="text/javascript">
        $(function() {
            $('.date-picker').datepicker( {
            changeMonth: true,
            changeYear: true,
            showButtonPanel: true,
            dateFormat: 'MM yy',
            onClose: function(dateText, inst) { 
                $(this).datepicker('setDate', new Date(inst.selectedYear, inst.selectedMonth, 1));
            }
            });
        });
    </script>
    <style>
    .ui-datepicker-calendar {
        display: none;
    }
    </style>
</head>
<body>
    <label for="startDate">Date :</label>
    <input name="startDate" id="startDate" class="date-picker" />
</body>
</html>

EDIT jsfiddle for the above example: http://jsfiddle.net/DBpJe/7755/

EDIT 2 Adds the month year value to input box only on clicking of Done button. Also allows to delete input box values, which isn't possible in above field http://jsfiddle.net/DBpJe/5103/

EDIT 3 updated Better Solution based on rexwolf's solution down.
http://jsfiddle.net/DBpJe/5106


@Ben Koehler, that's prefect! I made a minor modification so that using a single instance of the date picker more than once works as expected. Without this modification the date is parsed incorrectly and the previously selected date is not highlighted.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.js"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js"></script>
    <link rel="stylesheet" type="text/css" media="screen" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/base/jquery-ui.css">
    <script type="text/javascript">
    $(function() {
        $('.date-picker').datepicker( {
            changeMonth: true,
            changeYear: true,
            showButtonPanel: true,
            dateFormat: 'MM yy',
            onClose: function(dateText, inst) { 
                var month = $("#ui-datepicker-div .ui-datepicker-month :selected").val();
                var year = $("#ui-datepicker-div .ui-datepicker-year :selected").val();
                $(this).datepicker('setDate', new Date(year, month, 1));
            },
            beforeShow : function(input, inst) {
                var datestr;
                if ((datestr = $(this).val()).length > 0) {
                    year = datestr.substring(datestr.length-4, datestr.length);
                    month = jQuery.inArray(datestr.substring(0, datestr.length-5), $(this).datepicker('option', 'monthNamesShort'));
                    $(this).datepicker('option', 'defaultDate', new Date(year, month, 1));
                    $(this).datepicker('setDate', new Date(year, month, 1));
                }
            }
        });
    });
    </script>
    <style>
    .ui-datepicker-calendar {
        display: none;
        }
    </style>
</head>
<body>
    <label for="startDate">Date :</label>
    <input name="startDate" id="startDate" class="date-picker" />
</body>
</html>