var jsonData = JSON.parse(JSON.stringify(xhr));
        if (jsonData.length) {
            $('#comments').html("");
            var source_g = $('#comments_template').html();
            var template_g = Handlebars.compile(source_g);
            for ( var i = 0; i < jsonData.length; i++) {
                var data = jsonData[i];
                console.log("comments to display : "+data.comment);
                var html = template_g(data);
                $('#comments').append(html);
            }