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BAEL-7263: Check if a Thymeleaf variable is defined

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Constantin 2024-01-29 15:12:21 +02:00
parent a108e81950
commit 2c75afbbe3
3 changed files with 118 additions and 1 deletions
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11
spring-web-modules/spring-thymeleaf-5/src/main/java/com/baeldung/thymeleaf/controller/HomeController.java
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@ -23,4 +23,15 @@ public class HomeController {
return "home.html"; return "home.html";
} }
@RequestMapping(value = "/variable-defined", method = RequestMethod.GET)
public String getDefinedVariables(Model model) {
DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, Locale.getDefault());
model.addAttribute("serverTime", dateFormat.format(new Date()));
return "checkVariableIsDefined.html";
}
@RequestMapping(value = "/variable-not-defined", method = RequestMethod.GET)
public String getNotDefinedVariables(Model model) {
return "checkVariableIsDefined.html";
}
} }

14
spring-web-modules/spring-thymeleaf-5/src/main/webapp/WEB-INF/views/checkVariableIsDefined.html Normal file
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@ -0,0 +1,14 @@
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
th:with="lang=${#locale.language}" th:lang="${lang}">
<head>
<title>How to Check if a Variable is Defined in Thymeleaf</title>
</head>
<body>
<div th:if="${#ctx.containsVariable('serverTime')}" th:text="'Server Time Using the #ctx Object Is: ' + ${serverTime}"/>
<div th:if="${not (serverTime == null)}" th:text="'Server Time Using #th:if Conditional Is: ' + ${serverTime}"/>
<div th:unless="${serverTime == null}" th:text="'Server Time Using #th:unless Conditional Is: ' + ${serverTime}"/>
</body>
</html>

92
spring-web-modules/spring-thymeleaf-5/src/test/java/com/baeldung/thymeleaf/controller/HomeControllerIntegrationTest.java Normal file
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@ -0,0 +1,92 @@
package com.baeldung.thymeleaf.controller;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.not;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import com.baeldung.thymeleaf.config.WebApp;
import com.baeldung.thymeleaf.config.WebMVCConfig;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.web.context.WebApplicationContext;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@ContextConfiguration(classes = { WebApp.class, WebMVCConfig.class })
public class HomeControllerIntegrationTest {
private static final String CTX_OBJECT_MSG = "Server Time Using the #ctx Object Is: ";
private static final String IF_CONDITIONAL_MSG = "Server Time Using #th:if Conditional Is: ";
private static final String UNLESS_CONDITIONAL_MSG = "Server Time Using #th:unless Conditional Is: ";
@Autowired
private WebApplicationContext wac;
private MockMvc mockMvc;
@Before
public void setup() {
mockMvc = MockMvcBuilders.webAppContextSetup(wac)
.build();
}
@Test
public void whenVariableIsDefined_thenCtxObjectContainsVariable() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/variable-defined"))
.andExpect(status().isOk())
.andExpect(view().name("checkVariableIsDefined.html"))
.andExpect(content().string(containsString(CTX_OBJECT_MSG)));
}
@Test
public void whenVariableNotDefined_thenCtxObjectDoesNotContainVariable() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/variable-not-defined"))
.andExpect(status().isOk())
.andExpect(view().name("checkVariableIsDefined.html"))
.andExpect(content().string(not(containsString(CTX_OBJECT_MSG))));
}
@Test
public void whenVariableIsDefined_thenIfConditionalIsTrue() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/variable-defined"))
.andExpect(status().isOk())
.andExpect(view().name("checkVariableIsDefined.html"))
.andExpect(content().string(containsString(IF_CONDITIONAL_MSG)));
}
@Test
public void whenVariableIsNotDefined_thenIfConditionalIsFalse() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/variable-not-defined"))
.andExpect(status().isOk())
.andExpect(view().name("checkVariableIsDefined.html"))
.andExpect(content().string(not(containsString(IF_CONDITIONAL_MSG))));
}
@Test
public void whenVariableIsDefined_thenUnlessConditionalIsTrue() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/variable-defined"))
.andExpect(status().isOk())
.andExpect(view().name("checkVariableIsDefined.html"))
.andExpect(content().string(containsString(IF_CONDITIONAL_MSG)));
}
@Test
public void whenUsingUnlessConditionalAndVariableIsNotDefined_thenVariableIsNotPrinted() throws Exception {
mockMvc.perform(MockMvcRequestBuilders.get("/variable-not-defined"))
.andExpect(status().isOk())
.andExpect(view().name("checkVariableIsDefined.html"))
.andExpect(content().string(not(containsString(UNLESS_CONDITIONAL_MSG))));
}
}