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  • Dynamic combobox help

    Hi im try to make a dynamic combo box but dont work

    in my controller y have

    @RequestMapping(method=RequestMethod.GET,value="/registro")
    public ModelAndView detalleEvento() throws ExceptionCmm {
    RegistroUsuario registro = new RegistroUsuario();
    ModelAndView mav = new ModelAndView(REGISTRO_VIEW_KEY);
    mav.addObject("registro", registro);
    return mav;
    }

    in my class registro ai have a arraylist<> city, and arraylist<> state
    i want to populate the citys comobobox when state change

    but i dont know how to send the other arraylist without reload the page,
    whe reload de page lost the selected state
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