Thymeleaf - Dynamically Add or Remove a CSS Class - th:classappend Attribute

In this article, we will discuss how to dynamically add and remove CSS class in Thymeleaf templates. 

Using th:classappend attribute

Thymeleaf comes with th:classappend attribute that was created for adding a style class to an element without overwriting the existing defined classes.
The following example shows how to use it conditionally:
<div class="panel" th:classappend="${condition} ? 'white' : 'red'"></div>
If ${condition} is true the rendered website will look like the following:
<div class="panel white"></div>
when ${condition} is false the result will be:
<div class="panel red"></div>
Thymeleaf gives the ability to provide an inline condition without else command, that will look like the following:
<a href="/something" th:classappend="${condition}? 'tag'" class="link">Link</a>
In this case when ${condition} is false, null will be returned and no class will be appended to the attribute.

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