使用th:attr解决。

th:attr to the rescue Thymeleaf documentation – Setting attribute values.

For your scenario, this should do the job:

<div th:attr="data-el_id=${element.getId()}">

XML rules do not allow you to set an attribute twice in a tag, so you can’t have more than one th:attr in the same element.

Note: If you want more that one attribute, separate the different attributes by comma:如果想使用多个，方法如下

<div th:attr="data-id=${element.getId()},data-name=${element.getN‌​ame()}"> 

如果想拼接字符串。

原地址：https://stackoverflow.com/questions/24411826/using-data-attribute-with-thymeleaf