Using Thymeleaf th:class, th:classappend, th:style, th:styleappend

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1- th:class, th:classappend

Very often, in the Thymeleaf, you need to set up  values for the class attribute based on a condition. And you can use th:class or th:classappend or both to do this. 

th:class

th:class will create the class attribute (or replace the available class attribute) during generating  HTML by the  Thymeleaf Engine.  
(Template)
<p class ="user-class" th:class="${isAdmin} ? admin-class : user-class ">
    Some Text 1
</p>


<p th:class="${isAdmin} ? admin-class : user-class ">
   Some Text 2
</p>


<p th:class="${isAdmin} ? admin-class : '' ">
   Some Text 3
</p>
If ${isAdmin} is evaluated as true, you get the result: 
<p class ="admin-class">
   Some Text 1
</p>

<p class="admin-class">
   Some Text 2
</p>

<p class="admin-class">
   Some Text 3
</p>
If ${isAdmin} is evaluated as  false , you get the result:
<p class ="user-class">
   Some Text 1
</p>

<p class="user-class">
   Some Text 2
</p>

<p>
  Some Text 3
</p>

th:classappend

Use th:classappend if you want to append values for the  class attribute.
(Template)
<p class ="base-class" th:classappend="${isAdmin} ? admin-class : user-class">
    Some Text 1
</p>


<p th:class = "${isAdmin} ? base-admin-class : base-user-class"
   th:classappend ="${isAdmin} ? admin-class : user-class">
   Some Text 2
</p>
If ${isAdmin} is evaluated as  true, you get the result:
<p class ="base-class admin-class">
   Some Text 1
</p>

<p class = "base-admin-class admin-class">
   Some Text 2
</p>
If ${isAdmin} is evaluated as  false you get the result:
<p class ="base-class user-class">
   Some Text 1
</p>

<p class = "base-user-class user-class">
   Some Text 2
</p>

2- th:style, th:styleappend

Use th:style or  th:styleappend or both helps you establish values for the  style attributes based on a condition.

th:style

th:style will create a the  style attribute (or replace the available  style attribute) during generating HTML by the  Thymeleaf Engine.  

(Template)
<p style ="color: blue;" th:style = "${isAdmin} ? 'color: blue' : 'color: black' ">
    Some Text 1
</p>


<p th:style ="${isAdmin} ? 'color: blue' : 'color: black' ">
   Some Text 2
</p>


<p th:style ="${isAdmin} ? 'color: blue' : '' ">
   Some Text 3
</p>
If ${isAdmin} is evaluated as  true , you get the result:
<p style ="color: blue">
   Some Text 1
</p>

<p style ="color: blue">
   Some Text 2
</p>

<p class="color: blue">
   Some Text 3
</p>
If ${isAdmin} is evaluated as  false , you get the result:
<p style ="color: black">
   Some Text 1
</p>

<p style ="color: black">
   Some Text 2
</p>

<p>
   Some Text 3
</p>

th:styleappend

Use th:styleappend you want to append values for the  style attribute.
(Template)
<p style ="background: #eee;" th:styleappend = "${isAdmin} ? 'color: blue' : 'color: black' ">
    Some Text 1
</p>

<p th:style ="${isAmin} ? 'font-style: bold;' : 'font-style: italic;'"
   th:styleappend ="${isAdmin} ? 'color: blue' : 'color: black' ">
   Some Text 2
</p>
If ${isAdmin} is evaluated as  true you get the result:
<p style ="background: #eee; color: blue">
   Some Text 1
</p>

<p style ="font-style: italic; color: blue">
   Some Text 2
</p>
If ${isAdmin} is evaluated as  false you get the result:
<p style ="background: #eee; color: black">
   Some Text 1
</p>

<p style ="font-style: italic; color: black">
   Some Text 2
</p>

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