thymeleaf(th:each th:selected) 从后台动态获取下拉框数据回显及选中

 <div class="col-sm-8">
    <select data-placeholder="请选择实验室"  id="laboratoryId" name="laboratoryId"  class="form-control chosen-select" style=" 100%; "  required >
        <option   value=""   selected>请选择</option>
        <option   th:each="laboratoryDO:${laboratoryDOList}" th:value="${laboratoryDO.laboratoryId}"  th:text="${laboratoryDO.labName}" ></option>
    </select>
</div>

js

<script type="text/javascript" th:inline="javascript">
    $().ready(function() {
        var single = [[${laboratoryId}]];
        $("#laboratoryId option[value= " + single + "]").prop("selected",true);
    });
</script>

后台

model.addAttribute("laboratoryId",laboratoryId);