Thymeleaf provide null in controller

Question

I want to deliver the entire object from html to the controller

Controller:

@RequestMapping(method = RequestMethod.GET) public String get(){ Info info = new Info(); info.setTitle("Hello"); model.addAttribute("infos", Collections.singleton(info)); return "info-page"; } @RequestMapping(method = RequestMethod.POST, value = "show-all") public String showAllInfoObject(@ModelAttribute("info") Info info){ // info has null values! }

HTML

<li th:each="info : ${infos}"> <span th:text="${info.title}">webTitle</span>. <form th:action="@{'/show-all}" method="post"> <input type="hidden" name="result" th:field="*{info}" /> <input type="submit" value="show detalis" /> </form> </li>

However, the controller gets an empty object. Interestingly, when I provide only String "title", it gets the correct result in the controller.

How to deliver correctly the whole object from HTML?

Thiago Procaci · Accepted Answer · 2020-05-20 01:08:57Z

The problem is that th:field replaces the attributes value, id, and name in the input tag.

I would rewrite the HTML code as something like this:

<ul> <li th:each="info : ${infos}"> <span th:text="${info.title}"></span> <form th:action="@{/show-all}" method="post" > <input type="hidden" th:value="${info.title}" name="title" id="title" /> <input type="submit" value="show detalis" /> </form> </li> </ul>

So, setting the input name and id with "title", the controller will make the bind as expected.

The controller code remains the same but I will leave here the test that I did.

 @RequestMapping(method = RequestMethod.GET) public String get(Model model){ Info info = new Info(); info.setTitle("Hello"); Info info2 = new Info(); info2.setTitle("Hello2"); model.addAttribute("infos", Arrays.asList(info, info2)); return "info-page"; } @RequestMapping(method = RequestMethod.POST, value = "show-all") public String showAllInfoObject(@ModelAttribute("info") Info info){ // info has values! return "info-page"; }

Hope it helps you.

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