How to send data from radio buttons to Controller with Thymeleaf

Question

I have got an easy HTML page where I am displaying few radio buttons:

<form action="#" th:action="@{/processForm}" th:object="${priorities}"
  method="post">
  <fieldset>
    <table style="width: 500px">
      <tr th:each="item : ${chosen}">
        <td>
          <div>
            <div>
              <label th:text="${item}">example</label>
              <input type="radio" th:name="${'priorities[' + item + ']'}" value="a" />A
              <input type="radio" th:name="${'priorities[' + item + ']'}" value="b" />B
              <input type="radio" th:name="${'priorities[' + item + ']'}" value="c" />C
            </div>
          </div>
        </td>
      </tr>
      <tr>
        <td></td>
        <td></td>
      </tr>
      <tr>
        <td>
          <button type="submit"
            class="btn btn-xs btn-primary margin10-right paddingNew"
            name="save">Calculate!</button>
        </td>
        <td></td>
      </tr>
    </table>
  </fieldset>
</form>

Here you got what I can see:

I would like to send this data to my controller, so I created one:

@RequestMapping(value = "/processForm", method = RequestMethod.POST)
public String save(@ModelAttribute(value = "foo") ClusterParams foo,
@ModelAttribute(value = "priorities") HashMap<String, String> priorities,
final ModelMap m) throws ClassNotFoundException, IOException,
InterruptedException {

    for (String s : priorities.keySet()) {
        System.out.println(s);
    }
}

Here you can see my class Weights (removed):

public class Weights {

    Map<String, String> priorities = new HashMap<String, String>();

    public Map<String, String> getPriorities() {
        return priorities;
    }

    public void setPriorities(Map<String, String> priorities) {
        this.priorities = priorities;
    }

}

but I have no idea how to set the values with thymeleaf.

I would like to get a mapping:

camera -> B
video -> C

Could you help me to do that? Of course it is my idea with creating a HashMap, if there is any other solution I will change it.

Thank you in advance

Solution

According to 6.4.1 Setting and getting basic and nested properties, you should have <input> names such as priorities[camera] in generated HTML to make it work.

Try the following:

<input type="radio" th:name="${'priorities[' + item + ']'}" value="a" />