百里香叶的条件属性

Question

我希望根据单选按钮在mymeleaf的输入中添加一个必需的属性。

我的代码目前是：

<div class="form-group row">
    <fieldset class="col-md-6">
        <legend class="control-label init-font-size">
            <span th:text="#{myLabel}"></span>
        </legend>
        <label th:with="label_key='radio.'+${item}+'.label'" class="radio-inline required" th:id="'lbl_' + test + ${iteration.index}" th:for="'input_' + test + ${iteration.index}" th:each="item, iteration : ${ { 'yes', 'no' } }" >
            <input type="radio" required="required" th:id="'input_' + test + ${iteration.index}" th:field="*{test}" th:value="${item}"/>
            <span th:text="#{${label_key}}"></span>
        </label>
    </fieldset>
</div>

<div class="form-group row classTestInfos">
    <div class="col-md-6">
        <label class="control-label" th:for="testInfos">
            <span th:text="#{test.label}"></span>
            <a role="button" href="#" data-toggle="collapse" th:attr="'data-target'='#help' + testInfos" class="btn btn-help collapsed" th:title="#{testInfos.title}">
                <span class="blank sr-only" th:text="#{testfInfos.title}"></span>
            </a>
            <span class="text-danger" aria-hidden="true" th:attr="'data-error-required'=#{testInfos.empty}, 'data-error-format'=#{testInfos.format}"></span>
        </label>
        <div>
            <textarea  id="testInfos" maxlength="400" class="form-control" th:field="*{testInfos}" aria-invalid="false"/>
        </div>
    </div>
</div>

如何在单选按钮上选中“是”时，将需要textarea，否则不需要。