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Thymeleaf Variables Tutorial

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1- Variables

You are not strange to the concept of variable in the Java language, but what about it in Thymeleaf? Definitely, Thymeleaf also has the concept of variables. 
An attribute of  org.springframework.ui.Model object, or an attribute of  HttpServletRequest object is a variable of  Thymeleaf. This variable can be used everywhere in  Template.
(Java Spring)
@RequestMapping("/variable-example1")
public String variableExample1(Model model, HttpServletRequest request) {

    // variable1
    model.addAttribute("variable1", "Value of variable1!");

    // variable2
    request.setAttribute("variable2", "Value of variable2!");

    return "variable-example1";
}
variable-example1.html
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <meta charset="UTF-8" />
      <title>Variable</title>
   </head>
   <body>
       <h1>Variables</h1>  
       
       
       <h4>${variable1}</h4>
       <span th:utext="${variable1}"></span>
       
       <h4>${variable2}</h4>
       <span th:utext="${variable2}"></span>
        
       
   </body>
   
</html>

Local Variables

You can define variables in Template. They are local variables. They only exist and are available in a Template section.
In this example, two flower, iter variables only exist and are available within the loop that has declared them. 
(Java Spring)
@RequestMapping("/variable-in-loop")
public String objectServletContext(Model model, HttpServletRequest request) {

    String[] flowers = new String[] {"Rose","Lily", "Tulip", "Carnation", "Hyacinth" };
    
    
    model.addAttribute("flowers", flowers);

    return "variable-in-loop";
}
variable-in-loop.html
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8" />
  <title>Variable</title>
</head>
<body>
    <h1>Variable: flower, iter</h1>

    <table border="1">

        <tr>
            <th>No</th>
            <th>Flower Name</th>
        </tr>
        
        <!--
             Local Variable: flower
             Local Variable: iter (Iterator).
           -->
        <tr th:each="flower, iter : ${flowers}">
            <td th:utext="${iter.count}">No</td>
            <td th:utext="${flower}">Flower Name</td>
        </tr>

    </table>


</body>
</html>

th:with

You can also create one or more local variables through the th:with attribute. Its syntax is like a regular "value assignment expression".
(Java Spring)
@RequestMapping("/variable-example3")
public String variableExample3(Model model) {

    String[] flowers = new String[] {"Rose","Lily", "Tulip", "Carnation", "Hyacinth" };
    
    
    model.addAttribute("flowers", flowers);
 

    return "variable-example3";
}
variable-example3.html
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8" />
  <title>Variable</title>
</head>
<body>
    <h1>th:with</h1>

    <!-- Local variable: flower0 -->
    <div th:with="flower0 = ${flowers[0]}">
    
       <h4>${flower0}</h4>
       <span th:utext="${flower0}"></span>
    
    </div>
    
    <!-- Local variable: flower1, flower2 -->
    <div th:with="flower1 = ${flowers[1]}, flower2 = ${flowers[2]}">
    
       <h4>${flower1}, ${flower2}</h4>
       <span th:utext="${flower1}"></span>
       <br/>
       <span th:utext="${flower2}"></span>
    
    </div>
    
    <hr>
    
    <!-- Local variable: firstName, lastName, fullName -->
    <div th:with="firstName = 'James', lastName = 'Smith', fullName = ${firstName} +' ' + ${lastName}">
        
         First Name: <span th:utext="${firstName}"></span>
         <br>
         Last Name: <span th:utext="${lastName}"></span>
         <br>
         Full Name: <span th:utext="${fullName}"></span>
    
    
    </div>

</body>
</html>
Example, create an array in the Thymeleaf:
variable-array-example.html (Template)
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8" />
  <title>Variable</title>
</head>
<body>
    <h1>th:with (Array)</h1>

     <!-- Create an Array: -->
    <th:block th:with="flowers = ${ {'Rose', 'Lily', 'Tulip'} }">

        <table border="1">
            <tr>
                <th>No</th>
                <th>Flower</th>
            </tr>

            <tr th:each="flower, state : ${flowers}">

                <td th:utext="${state.count}">No</td>
                <td th:utext="${flower}">Flower</td>

            </tr>
        </table>

    </th:block>

</body>
</html>

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