Question

I am adding to the ModelMap a Map which contains a list to go on a drop down an I am populating the ModelAttribute when the form initialises:

@RequestMapping(method = RequestMethod.GET)
    public String initForm(HttpServletRequest httpRequest, ModelMap model)
    {
        model.addAttribute("myList", myMap);
        return "MyForm";
    }

It works as expected however when the user submits the form this list is lost from the map.

@RequestMapping(method = RequestMethod.POST, value ="/dosearch")
    public String processSearch(... ModelMap model)
    {
                .....
    return new ModelAndView("MyForm",model);

This approach above doesn’t work.

How can I prserve the map between form submits?

Answer 1

No. Even a flash scope won’t help you here, because you are not using redirect-after-post. Here are the options:

• output all values in the html form, then they will be submitted to /dosearch and you’ll be able to get them from the request
• use the session to store the values (worse option)