namespace DepartmentsLookup
{
    [CLSCompliant(false)]
    [Guid("9e13fe7a-86cb-4886-9500-89bbf9b0d7b5")]
    public class DepartmentsLookupField : SPFieldChoice
    {
        public DepartmentsLookupField(SPFieldCollection fields, string fieldName)
            : base(fields, fieldName)
        {
        }
        
        public DepartmentsLookupField(SPFieldCollection fields, string typeName, string displayName)
            : base(fields, typeName, displayName)
        {
        }

        public override BaseFieldControl FieldRenderingControl
        {
            [SharePointPermission(SecurityAction.LinkDemand, ObjectModel = true)]
            get
            {
                BaseFieldControl fieldControl = new DepartmentsLookupFieldControl();
                fieldControl.FieldName = InternalName;

                return fieldControl;
            }
        }
    }
}

namespace DepartmentsLookup
{
    [CLSCompliant(false)]
    [Guid("f3d236b0-ba93-4e8c-a1b5-ce982339bd2d")]
    public class DepartmentsLookupFieldControl : DropDownChoiceField
    {
        protected override void Render(System.Web.UI.HtmlTextWriter output)
        {
            base.Render(output);

		    if (ControlMode == SPControlMode.New || ControlMode == SPControlMode.Edit)
                output.Write("<script type=\"text/javascript\"> var deptId=\"" + ClientID + "\";");
        }
    }
}