如何在表单提交之间保留 ModelMap? [英] How to preserve the ModelMap between form submits?

问题描述

我在 ModelMap 中添加了一个 Map，它包含一个下拉列表，当表单初始化时我正在填充 ModelAttribute:

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";
    }

它按预期工作，但是当用户提交表单时，此列表将从地图中丢失.

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);

上述方法不起作用.

如何在表单提交之间保留地图?

How can I prserve the map between form submits?

推荐答案

没有.在这里，即使是 flash 范围也无济于事，因为您没有使用后重定向.以下是选项:

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

• 以html形式输出所有值，然后将它们提交到/dosearch，您就可以从请求中获取它们
• 使用会话来存储值(更糟糕的选择)

• 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)

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