Stirling-PDF/src/main/resources/templates/fragments/navbar.html

<div th:fragment="navbar">
	<nav class="navbar navbar-expand-lg navbar-light bg-light">
		<div class="container">

			<a class="navbar-brand" href="#" th:href="@{/}">Stirling PDF</a>

			<button class="navbar-toggler" type="button" data-toggle="collapse"
					data-target="#navbarNav" aria-controls="navbarNav"
					aria-expanded="false" aria-label="Toggle navigation">
				<span class="navbar-toggler-icon"></span>
			</button>

			<div class="collapse navbar-collapse" id="navbarNav">

				<ul class="navbar-nav">

					<li class="nav-item">
						<a class="nav-link" href="#" th:href="@{merge-pdfs}" th:classappend="${currentPage}=='merge-pdfs' ? 'active' : ''" th:text="#{home.merge.title}"></a>
					</li>

					<li class="nav-item">
						<a class="nav-link" href="#" th:href="@{split-pdfs}" th:classappend="${currentPage}=='split-pdfs' ? 'active' : ''" th:text="#{home.split.title}"></a>
					</li>

					<li class="nav-item">
						<a class="nav-link" href="#" th:href="@{pdf-organizer}" th:classappend="${currentPage}=='pdf-organizer' ? 'active' : ''" th:text="#{home.pdfOrganiser.title}"></a>
					</li>

					<li class="nav-item">
						<a class="nav-link" href="#" th:href="@{rotate-pdf}" th:classappend="${currentPage}=='rotate-pdf' ? 'active' : ''" th:text="#{home.rotate.title}"></a>
					</li>

					<li class="nav-item dropdown" th:classappend="${currentPage}=='pdf-to-img' OR ${currentPage}=='img-to-pdf' ? 'active' : ''">
						<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"  th:text="#{navbar.convert}"></a>
						<div class="dropdown-menu" aria-labelledby="navbarDropdown">
							<a class="dropdown-item" href="#" th:href="@{pdf-to-img}" th:classappend="${currentPage}=='pdf-to-img' ? 'active' : ''"  th:text="#{home.pdfToImage.title}"></a>
							<a class="dropdown-item" href="#" th:href="@{img-to-pdf}" th:classappend="${currentPage}=='img-to-pdf' ? 'active' : ''" th:text="#{home.imageToPdf.title}"></a>
						</div>
					</li>

					<li class="nav-item dropdown" th:classappend="${currentPage}=='add-password' OR ${currentPage}=='remove-password' OR ${currentPage}=='change-permissions' OR ${currentPage}=='add-watermark' ? 'active' : ''">
						<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"  th:text="#{navbar.security}"></a>
						<div class="dropdown-menu" aria-labelledby="navbarDropdown">
							<a class="dropdown-item" href="#" th:href="@{add-password}" th:classappend="${currentPage}=='add-password' ? 'active' : ''" th:text="#{home.addPassword.title}"></a>
							<a class="dropdown-item" href="#" th:href="@{remove-password}" th:classappend="${currentPage}=='remove-password' ? 'active' : ''" th:text="#{home.removePassword.title}"></a>
							<a class="dropdown-item" href="#" th:href="@{change-permissions}" th:classappend="${currentPage}=='change-permissions' ? 'active' : ''" th:text="#{home.permissions.title}"></a>
							<a class="dropdown-item" href="#" th:href="@{add-watermark}" th:classappend="${currentPage}=='add-watermark' ? 'active' : ''"  th:text="#{home.watermark.title}"></a>
							<a class="dropdown-item" href="#" th:href="@{change-metadata}" th:classappend="${currentPage}=='change-metadata' ? 'active' : ''"  th:text="#{home.changeMetadata.title}"></a>
						</div>
					</li>

					<li class="nav-item dropdown" th:classappend="${currentPage}=='remove-pages' OR ${currentPage}=='add-image' OR ${currentPage}=='compress-pdf' ? 'active' : ''">
						<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" th:text="#{navbar.other}"></a>
						<div class="dropdown-menu" aria-labelledby="navbarDropdown">
							<a class="dropdown-item" href="#" th:href="@{add-image}" th:classappend="${currentPage}=='add-image' ? 'active' : ''" th:text="#{home.addImage.title}"></a>
							<a class="dropdown-item" href="#" th:href="@{compress-pdf}" th:classappend="${currentPage}=='compress-pdf' ? 'active' : ''" th:text="#{home.compressPdfs.title}"></a>
							<a class="dropdown-item" href="#" th:href="@{remove-pages}" th:classappend="${currentPage}=='remove-pages' ? 'active' : ''" th:text="#{home.removePages.title}"></a>
						</div>
					</li>

					<li class="nav-item">
						<a class="nav-link" href="#" th:href="@{add-image}" th:classappend="${currentPage}=='add-image' ? 'active' : ''"></a>
					</li>

					<li class="nav-item">
						<a class="nav-link" href="#" th:href="@{compress-pdf}" th:classappend="${currentPage}=='compress-pdf' ? 'active' : ''"></a>
					</li>
                  
					<input type="checkbox" id="toggle-dark-mode" checked="true" th:onclick="javascript:toggleDarkMode()">
					<a class="nav-link" href="#" for="toggle-dark-mode" th:text="#{navbar.darkmode}"></a>
                   
                    
					<li class="nav-item dropdown">
						<a class="nav-link dropdown-toggle" href="#" id="languageDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
							<i class="bi bi-globe2"></i>
						</a>
						<div class="dropdown-menu" aria-labelledby="languageDropdown">
							<a class="dropdown-item lang_dropdown-item" href="" data-language-code="en_US">English (US)</a>
							<a class="dropdown-item lang_dropdown-item" href="" data-language-code="en_GB">English (UK)</a>
							<a class="dropdown-item lang_dropdown-item" href="" data-language-code="ar_AR">العربية</a>
							<a class="dropdown-item lang_dropdown-item" href="" data-language-code="de_DE">Deutsch</a>
							<a class="dropdown-item lang_dropdown-item" href="" data-language-code="fr_FR">Français</a>
						</div>
					</li>

				</ul>

				<script>
					document.addEventListener('DOMContentLoaded', function() {
						// Get the dropdown items
						var dropdownItems = document.querySelectorAll('.lang_dropdown-item');

						// Loop through the dropdown items
						for (var i = 0; i < dropdownItems.length; i++) {
							dropdownItems[i].classList.remove('active');
							if (dropdownItems[i].dataset.languageCode ===  localStorage.getItem('languageCode')) {
								dropdownItems[i].classList.add('active');
							}

							// Add a click event listener to each dropdown item
							dropdownItems[i].addEventListener('click', function(event) {

								// Prevent the default link behavior
								event.preventDefault();

								// Get the language code
								var languageCode = this.dataset.languageCode;

								// Save the language code to local storage
								localStorage.setItem('languageCode', languageCode);

								// Get the current URL
								var currentUrl = window.location.href;

								// Check if the URL already contains a "?lang" query parameter
								if (currentUrl.indexOf('?lang=') === -1) {
									// Update the URL with the "?lang" query parameter
									window.location.href = currentUrl + '?lang=' + languageCode;
								} else {
									// Replace the "?lang" query parameter with the new value
									window.location.href = currentUrl.replace(/\?lang=\w{2,}/, '?lang=' + languageCode);
								}
							});
						}
					});
				</script>

			</div>
		</div>
	</nav>
</div>