Thymeleaf check box checked using two string collection

Question

I have two string collection.

One is to generate all check boxes.

The other one is to select the element to check.

For example, I have two string collections ["A", "B", "C", "D"] ["A", "C"]

I want to make 4 check boxes A, B, C, D and want to check A and C

I tried as below.

    <span th:each="interestName : ${allInterest}">
        <span th:each="interest : ${userInfo.interestName}">
            <input type="checkbox"
               name="eachUserInterest"
               th:value="${interestName.name}"
                th:checked="${interestName.name.equals(interest)}"/>
            <label th:text="${interestName.name}"></label>
        </span>
    </span>

However, above code generates a check box repeatedly as many times as it is checked. Execution Results

Help me, please.

Answer 1

You should just loop over the allInterest array, and use contains to determine whether or not the checkbox is checked. Something like this for example:

<th:block th:each="interest: ${allInterest}">
  <input type="checkbox"
         name="eachUserInterest"
         th:value="${interest}"
         th:checked="${userInfo.interestName.contains(interest)}" />
  <label th:text="${interest}"></label>
</th:block>