Code behind for Umbraco dynamically- generated Javascript for hiding back-end properties

HidePropertiesJsOutput.ashx.cs

using System.Configuration;
using System.Web;

namespace MyNamespace
{
    public class HidePropertiesJsOutput : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/javascript";
            string fieldsToHide = ConfigurationManager.AppSettings.Get("HideBackEndFields");
            if (!string.IsNullOrEmpty(fieldsToHide))
            {
                foreach (string field in fieldsToHide.Split(','))
                {
                    context.Response.Write("$(document).arrive(\"div[data-element='property-" + field + "']\", function () { $(this).hide(); });\r\n");
                }
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}