Nested Loop Binding in Thymeleaf

Question

I am making web app using Java/Spring/Thymeleaf and don't seem to be able to get past this problem!

So, here's my thymeleaf template code:

<form th:action="@{/holiday/create}" th:object="${holiday}" method="post">
    <select name="user_scroll">
        <option th:each="user : ${allUsers}" th:value="${user.id}"
                th:text="${user.email}" th:field="${holiday.user_id}" />
    </select>
    <button type="submit">
        Create
    </button>
</form>

I have read the related questions on here but am still stumped. I did read that you can't bind an object directly that's why I am trying to bind to the user_id property of the holiday object. I did suspect the holiday object my be out of scope but that doesn't seem to be the case. Perhaps I am accessing the user_id property incorrectly?

When I click submit and follow debug through to my controller user_id is just sent through as null. I hope that's enough info - let me know if I need to provide more. Thanks!

What is the exact problem you have?

mtyurt
– mtyurt

2015-05-14 08:56:37 +00:00
Commented May 14, 2015 at 8:56 — mtyurt
– mtyurt, Commented May 14, 2015 at 8:56

Razorblade · Accepted Answer · 2015-05-16 19:08:19Z

1

Frankie, try adding the th:field attribute to the select object instead of putting it in the option. Like this:

 <select name="user_scroll" th:field="*{user_id}">

Notice the SPel syntax. Starts with an asterisk instead of $ and says user_id instead of holiday.user_id. You can access the field directly this way, since you already have defined it as your selected object in the form definition using

th:object="${holiday}"

This will also bind the selected value to the user_id property of your backing object and should solve the problem.

answered May 16, 2015 at 19:08

Razorblade

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