Spring MVC jQuery remote validation

jquery, json, spring, validation

Solution

I encountered the same problem with you.

and now I do

@RequestMapping(value = "/brand/check/exists", method = RequestMethod.GET)
public void isBrandNameExists(HttpServletResponse response,
        @RequestParam(value = "name", required = false) String name)
        throws IOException {
    response.getWriter().write(
            String.valueOf(Brand.findBrandsByName(name).getResultList()
                    .isEmpty()));
}

May not be a good solution. But anyway, that works out.

If there is a better way, please let me know :)

Update:

In Spring 3.0 we can use @ResponseBody to do this

@RequestMapping(value = "/brand/exists/name", method = RequestMethod.GET)
@ResponseBody
public boolean isBrandNameExists(HttpServletResponse response,
        @RequestParam String name) throws IOException {
    return Brand.findBrandsByName(name).getResultList().isEmpty();
}

Problem

I am using Spring MVC on the server side, but in one of the pages I decided to create an AJAX validation with jQuery rather than the default Spring validation. Everything works great, except when I have to do a remote validation to check if a "title" already exists in the database. For the javascript I have the following: ``` var validator = $("form").validate({ rules: { title: { minlength: 6, required: true, remote: { url: location.href.substring(0,location.href.lastIndexOf('/'))+"/checkLocalArticleTitle.do", type: "GET" } }, html: { minlength: 50, required: true } }, messages: { title: { required: "A title is required.", remote: "This title already exists." } } }); ``` Then, I use Spring-Json to make this validation and give a response: ``` @RequestMapping("/checkLocalArticleTitle.do") public ModelAndView checkLocalArticleTitle(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Map model = new HashMap(); String result = "FALSE"; try{ String title = request.getParameter("title"); if(!EJBRequester.articleExists(title)){ result = "TRUE"; } }catch(Exception e){ System.err.println("Exception: " + e.getMessage()); } model.put("result",result); return new ModelAndView("jsonView", model); } ``` However, this does not work and the field "title" is never validated. I think the reason for this is that I am returning an answer in the manner: ``` {result:"TRUE"} ``` when in fact, the answer should be: ``` {"TRUE"} ``` I don't know how to return a single response like this one using a ModelAndView answer. Another thing that is not working is the customized message for the "remote" validation: ``` messages: { title: { required: "A title is required.", remote: "This title already exists." } }, ``` The required message works, but not the remote message. I looked around, but I didn't see many people using Spring and jQuery at the same time. At least, not mixing with jQuery remote valdations and Spring-Json. I would appreciate some help here.

Original source