working with booleans in thymeleaf (#4061)
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fanatixan
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package com.baeldung.thymeleaf.controller;
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import org.springframework.stereotype.Controller;
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import org.springframework.ui.Model;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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/**
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* Controller to test boolean expressions
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*
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*/
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@Controller
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public class BooleanExpressionsController {
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@RequestMapping(value = "/booleans", method = RequestMethod.GET)
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public String getDates(Model model) {
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// "truthy" values
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model.addAttribute("trueValue", true);
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model.addAttribute("one", 1);
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model.addAttribute("nonZeroCharacter", 'a');
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model.addAttribute("emptyString", "");
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model.addAttribute("foo", "foo");
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model.addAttribute("object", new Object());
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model.addAttribute("arrayOfZeros", new Integer[] { 0, 0 });
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model.addAttribute("arrayOfZeroAndOne", new Integer[] { 0, 1 });
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model.addAttribute("arrayOfOnes", new Integer[] { 1, 1 });
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// "falsy" values
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model.addAttribute("nullValue", null);
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model.addAttribute("falseValue", false);
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model.addAttribute("zero", 0);
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model.addAttribute("zeroCharacter", '\0');
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model.addAttribute("falseString", "false");
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model.addAttribute("no", "no");
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model.addAttribute("off", "off");
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model.addAttribute("isRaining", true);
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model.addAttribute("isSunny", true);
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model.addAttribute("isCold", false);
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model.addAttribute("isWarm", true);
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return "booleans.html";
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}
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}
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@@ -0,0 +1,179 @@
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml"
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xmlns:th="http://www.thymeleaf.org">
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<head>
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<meta charset="UTF-8">
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<title>Expression utility objects</title>
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<style>
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table {
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border-collapse: collapse;
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}
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td {
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border: 1px solid black;
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padding: .5em;
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}
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</style>
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</head>
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<body>
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<h1>'Truthy' and 'falsy' expressions</h1>
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<ul>
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<li>'true' is evaluated to <strong th:text="${#bools.isTrue(trueValue)}"></strong></li>
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<li>'1' is evaluated to <strong th:text="${#bools.isTrue(one)}"></strong></li>
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<li>non zero character is evaluated to <strong th:text="${#bools.isTrue(nonZeroCharacter)}"></strong></li>
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<li>empty string is evaluated to <strong th:text="${#bools.isTrue(emptyString)}"></strong></li>
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<li>the string "foo" is evaluated to <strong th:text="${#bools.isTrue(foo)}"></strong></li>
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<li>an object is evaluated to <strong th:text="${#bools.isTrue(object)}"></strong></li>
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<li>the array [0, 0] is evaluated to <strong th:text="${#bools.isTrue(arrayOfZeros)}"></strong></li>
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<li>the array [0, 1] is evaluated to <strong th:text="${#bools.isTrue(arrayOfZeroAndOne)}"></strong></li>
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<li>the array [1, 1] is evaluated to <strong th:text="${#bools.isTrue(arrayOfOnes)}"></strong></li>
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<li>null value is evaluated to <strong th:text="${#bools.isTrue(nullValue)}"></strong></li>
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<li>'false' is evaluated to <strong th:text="${#bools.isTrue(falseValue)}"></strong></li>
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<li>'0' is evaluated to <strong th:text="${#bools.isTrue(zero)}"></strong></li>
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<li>zero character is evaluated to <strong th:text="${#bools.isTrue(zeroCharacter)}"></strong></li>
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<li>the string "false" is evaluated to <strong th:text="${#bools.isTrue(falseString)}"></strong></li>
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<li>the string "no" is evaluated to <strong th:text="${#bools.isTrue(no)}"></strong></li>
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<li>the string "off" is evaluated to <strong th:text="${#bools.isTrue(off)}"></strong></li>
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</ul>
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<h1>Using booleans as rendering conditions</h1>
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<table>
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<tr>
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<td></td>
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<td>th:if</td>
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<td>th:unless</td>
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</tr>
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<tr>
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<td>true</td>
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<td><span th:if="${true}">will be rendered</span></td>
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<td><span th:unless="${true}">won't be rendered</span></td>
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</tr>
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<tr>
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<td>false</td>
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<td><span th:if="${false}">won't be rendered</span></td>
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<td><span th:unless="${false}">will be rendered</span></td>
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</tr>
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</table>
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<h1>Boolean and conditional operators</h1>
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<table>
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<tr>
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<td>A</td>
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<td>B</td>
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<td>${A or B}</td>
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<td>${A} or ${B}</td>
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<td>${A and B}</td>
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<td>${A} and ${B}</td>
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<td>${!A}</td>
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<td>!${A}</td>
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<td>${not A}</td>
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<td>not ${A}</td>
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</tr>
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<tr>
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<td>true</td>
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<td>true</td>
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<td th:text="${true or true}"></td>
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<td th:text="${true} or ${true}"></td>
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<td th:text="${true and true}"></td>
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<td th:text="${true} and ${true}"></td>
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<td th:text="${!true}"></td>
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<td th:text="!${true}"></td>
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<td th:text="${not true}"></td>
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<td th:text="not ${true}"></td>
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</tr>
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<tr>
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<td>true</td>
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<td>false</td>
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<td th:text="${true or false}"></td>
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<td th:text="${true} or ${false}"></td>
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<td th:text="${true and false}"></td>
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<td th:text="${true} and ${false}"></td>
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<td th:text="${!true}"></td>
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<td th:text="!${true}"></td>
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<td th:text="${not true}"></td>
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<td th:text="not ${true}"></td>
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</tr>
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<tr>
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<td>false</td>
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<td>true</td>
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<td th:text="${false or true}"></td>
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<td th:text="${false} or ${true}"></td>
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<td th:text="${false and true}"></td>
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<td th:text="${false} and ${true}"></td>
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<td th:text="${!false}"></td>
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<td th:text="!${false}"></td>
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<td th:text="${not false}"></td>
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<td th:text="not ${false}"></td>
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</tr>
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<tr>
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<td>false</td>
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<td>false</td>
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<td th:text="${false or false}"></td>
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<td th:text="${false} or ${false}"></td>
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<td th:text="${false and false}"></td>
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<td th:text="${false} and ${false}"></td>
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<td th:text="${!false}"></td>
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<td th:text="!${false}"></td>
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<td th:text="${not false}"></td>
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<td th:text="not ${false}"></td>
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</tr>
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</table>
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<ul>
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<li> the result of "true ? 'then'" is <strong th:text="true ? 'then'"></strong></li>
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<li> the result of "false ? 'then'" is <strong th:text="false ? 'then'"></strong></li>
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<li> the result of "true ? 'then' : 'else'" is <strong th:text="true ? 'then' : 'else'"></strong></li>
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<li> the result of "false ? 'then' : 'else'" is <strong th:text="false ? 'then' : 'else'"></strong></li>
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<li> the result of "'foo' ?: 'bar'" is <strong th:text="'foo' ?: 'bar'"></strong></li>
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<li> the result of "null ?: 'bar'" is <strong th:text="null ?: 'bar'"></strong></li>
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<li> the result of "0 ?: 'bar'" is <strong th:text="0 ?: 'bar'"></strong></li>
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<li> the result of "1 ?: 'bar'" is <strong th:text="1 ?: 'bar'"></strong></li>
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</ul>
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<ul>
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<li><span th:if="${isRaining or isCold}">The weather is bad</span></li>
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<li><span th:if="${isRaining} or ${isCold}">The weather is bad</span></li>
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<li><span th:if="${isSunny and isWarm}">The weather is good</span></li>
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<li><span th:if="${isSunny} and ${isWarm}">The weather is good</span></li>
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<li><span th:if="${not isCold}">It's warm</span></li>
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<li><span th:if="${!isCold}">It's warm</span></li>
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<li><span th:if="not ${isCold}">It's warm</span></li>
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<li><span th:if="!${isCold}">It's warm</span></li>
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<li>It's <span th:text="${isCold} ? 'cold' : 'warm'"></span></li>
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<li><span th:text="${isRaining or isCold} ? 'The weather is bad'"></span></li>
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</ul>
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<h1>#bools utility object</h1>
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<table>
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<tr>
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<td>Array</td>
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<td>#bools.arrayIsTrue()</td>
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<td>#bools.arrayIsFalse()</td>
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<td>#bools.arrayAnd()</td>
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<td>#bools.arrayOr()</td>
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</tr>
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<tr>
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<td>[0, 0]</td>
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<td th:text="${#strings.arrayJoin(#bools.arrayIsTrue(arrayOfZeros), ',')}"></td>
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<td th:text="${#strings.arrayJoin(#bools.arrayIsFalse(arrayOfZeros), ',')}"></td>
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<td th:text="${#bools.arrayAnd(arrayOfZeros)}"></td>
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<td th:text="${#bools.arrayOr(arrayOfZeros)}"></td>
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</tr>
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<tr>
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<td>[0, 1]</td>
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<td th:text="${#strings.arrayJoin(#bools.arrayIsTrue(arrayOfZeroAndOne), ',')}"></td>
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<td th:text="${#strings.arrayJoin(#bools.arrayIsFalse(arrayOfZeroAndOne), ',')}"></td>
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<td th:text="${#bools.arrayAnd(arrayOfZeroAndOne)}"></td>
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<td th:text="${#bools.arrayOr(arrayOfZeroAndOne)}"></td>
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</tr>
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<tr>
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<td>[1, 1]</td>
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<td th:text="${#strings.arrayJoin(#bools.arrayIsTrue(arrayOfOnes), ',')}"></td>
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<td th:text="${#strings.arrayJoin(#bools.arrayIsFalse(arrayOfOnes), ',')}"></td>
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<td th:text="${#bools.arrayAnd(arrayOfOnes)}"></td>
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<td th:text="${#bools.arrayOr(arrayOfOnes)}"></td>
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</tr>
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</table>
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</body>
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</html>
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