Thymeleaf conditionals (#3949)

* different types of thymeleaf conditionals

* improved thymeleaf conditionals

spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/controller/TeacherController.java

@@ -0,0 +1,19 @@
+package com.baeldung.thymeleaf.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import com.baeldung.thymeleaf.utils.TeacherUtils;
+
+@Controller
+public class TeacherController {
+
+	@RequestMapping(value = "/listTeachers", method = RequestMethod.GET)
+	public String getInfo(Model model) {
+		model.addAttribute("teachers", TeacherUtils.buildTeachers());
+
+		return "listTeachers.html";
+	}
+}

spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Teacher.java

@@ -0,0 +1,78 @@
+package com.baeldung.thymeleaf.model;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+
+public class Teacher implements Serializable {
+
+	private static final long serialVersionUID = 946941572942270450L;
+
+	@NotNull(message = "Teacher ID is required.")
+	@Min(value = 1000, message = "Teacher ID must be at least 4 digits.")
+	private Integer id;
+
+	@NotNull(message = "Teacher name is required.")
+	private String name;
+
+	@NotNull(message = "Teacher gender is required.")
+	private String gender;
+
+	private boolean isActive;
+
+	private List<String> courses = new ArrayList<String>();
+
+	private String additionalSkills;
+
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getGender() {
+		return gender;
+	}
+
+	public void setGender(String gender) {
+		this.gender = gender;
+	}
+
+	public boolean isActive() {
+		return isActive;
+	}
+
+	public void setActive(boolean isActive) {
+		this.isActive = isActive;
+	}
+
+	public List<String> getCourses() {
+		return courses;
+	}
+
+	public void setCourses(List<String> courses) {
+		this.courses = courses;
+	}
+
+	public String getAdditionalSkills() {
+		return additionalSkills;
+	}
+
+	public void setAdditionalSkills(String additionalSkills) {
+		this.additionalSkills = additionalSkills;
+	}
+
+}

spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/utils/TeacherUtils.java

@@ -0,0 +1,47 @@
+package com.baeldung.thymeleaf.utils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.baeldung.thymeleaf.model.Teacher;
+
+public class TeacherUtils {
+
+	private static List<Teacher> teachers = new ArrayList<Teacher>();
+
+	public static List<Teacher> buildTeachers() {
+		if (teachers.isEmpty()) {
+			Teacher teacher1 = new Teacher();
+			teacher1.setId(2001);
+			teacher1.setName("Jane Doe");
+			teacher1.setGender("F");
+			teacher1.setActive(true);
+			teacher1.getCourses().add("Mathematics");
+			teacher1.getCourses().add("Physics");
+
+			teachers.add(teacher1);
+
+			Teacher teacher2 = new Teacher();
+			teacher2.setId(2002);
+			teacher2.setName("Lazy Dude");
+			teacher2.setGender("M");
+			teacher2.setActive(false);
+			teacher2.setAdditionalSkills("emergency responder");
+
+			teachers.add(teacher2);
+
+			Teacher teacher3 = new Teacher();
+			teacher3.setId(2002);
+			teacher3.setName("Micheal Jordan");
+			teacher3.setGender("M");
+			teacher3.setActive(true);
+			teacher3.getCourses().add("Sports");
+
+			teachers.add(teacher3);
+
+		}
+
+		return teachers;
+	}
+
+}

spring-thymeleaf/src/main/resources/messages_en.properties

@@ -1,9 +1,12 @@
-msg.id=ID
-msg.name=Name
-msg.gender=Gender
-msg.percent=Percentage
-welcome.message=Welcome Student !!!
-msg.AddStudent=Add Student
-msg.ListStudents=List Students
-msg.Home=Home
-
+msg.id=ID
+msg.name=Name
+msg.gender=Gender
+msg.percent=Percentage
+welcome.message=Welcome Student !!!
+msg.AddStudent=Add Student
+msg.ListStudents=List Students
+msg.Home=Home
+msg.ListTeachers=List Teachers
+msg.courses=Courses
+msg.skills=Skills
+msg.active=Active

spring-thymeleaf/src/main/webapp/WEB-INF/views/home.html

@@ -18,6 +18,9 @@
 		<tr>
 			<td><a th:href="@{/listStudents}" th:text="#{msg.ListStudents}" /></td>
 		</tr>
+		<tr>
+			<td><a th:href="@{/listTeachers}" th:text="#{msg.ListTeachers}" /></td>
+		</tr>
 	</table>
 </body>
 </html>

spring-thymeleaf/src/main/webapp/WEB-INF/views/listTeachers.html

@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml"
+	xmlns:th="http://www.thymeleaf.org">
+<head>
+<title>Teacher List</title>
+</head>
+
+<body>
+	<h1>Teacher List</h1>
+	<table border="1">
+		<thead>
+			<tr>
+				<th th:text="#{msg.id}" />
+				<th th:text="#{msg.name}" />
+				<th th:text="#{msg.gender}" />
+				<th th:text="#{msg.active}" />
+				<th th:text="#{msg.courses}" />
+				<th th:text="#{msg.skills}" />
+			</tr>
+		</thead>
+		<tbody>
+			<tr th:each="teacher: ${teachers}">
+				<td th:text="${teacher.id}" />
+				<td th:text="${{teacher.name}}" />
+
+				<td><span th:if="${teacher.gender == 'F'}">Female</span> <span
+					th:unless="${teacher.gender == 'F'}">Male</span></td>
+
+				<td th:text="${teacher.active} ? 'ACTIVE' : 'RETIRED'" />
+
+				<td th:switch="${#lists.size(teacher.courses)}"><span
+					th:case="'0'">NO COURSES YET!</span> <span th:case="'1'"
+					th:text="${teacher.courses[0]}"></span>
+					<div th:case="*">
+						<div th:each="course: ${teacher.courses}" th:text="${course}"></div>
+					</div></td>
+
+				<td th:text="*{teacher.additionalSkills}?: 'UNKNOWN'" />
+			</tr>
+		</tbody>
+	</table>
+	<div>
+		<p>
+			<a th:href="@{/}" th:text="#{msg.Home}" />
+		</p>
+	</div>
+</body>
+</html>
+
+

spring-thymeleaf/src/test/java/com/baeldung/thymeleaf/controller/ExpressionUtilityObjectsControllerIntegrationTest.java

@@ -59,5 +59,10 @@ public class ExpressionUtilityObjectsControllerIntegrationTest {
     public void testDates() throws Exception {
         mockMvc.perform(get("/dates").with(testUser()).with(csrf())).andExpect(status().isOk()).andExpect(view().name("dates.html"));
     }
+    
+    @Test
+    public void testTeachers() throws Exception {
+        mockMvc.perform(get("/listTeachers").with(testUser()).with(csrf())).andExpect(status().isOk()).andExpect(view().name("listTeachers.html"));
+    }
 
 }