From jQuery to JavaScript – How to make the move

From jQuery to JavaScript – How to make the move Thumbnail
Published on 12. June 2020

Moving from jQuery to JavaScript offers several advantages. Besides removing dead code, you can also increase your website speed for SEO.

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You have already made the switch from jQuery to pure JavaScript (also called Vanilla JS), otherwise you probably wouldn’t be here. That’s a good start. I was also faced with this decision, so I’ll try to help you with the switch and show you why it’s worth it and how you can proceed.

I had the hope that there is some kind of “jQuery to JavaScript converter” or something like that online. But I was taught better.

So if you really want to make the move, you have to do it manually. But I’ll help you make the move.

Below is a list of 1:1 conversions from jQuery to Vanilla JavaScript.

Improve SEO through Vanilla JavaScript?

Sounds funny at first, but there’s something to it. I’m always working on improving this site and the articles. For me – and also for search engines – the loading speed of the website is an important key figure.

I like to use web.dev Measure or PageSpeed Insights for testing. In the detailed report you get a detailed list of all problems, including the loading speed.

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I had a too high value for the execution time of JavaScript. Now I am very satisfied with it.

JavaScript execution time after the conversion
JavaScript execution time after the conversion

Also with resources that are loaded my jQuery file appeared additionally. And if you look here, the jQuery file with 11KB is already one of the larger files – despite being minified.

Resources that block rendering after the change
Resources that block rendering after the change

Don’t get me wrong, I love jQuery – simply an ingenious library. I have already programmed many great functions, like a Reading Position Indicator with jQuery.

But still I had to ban that from this site – for SEO and maybe also as a little challenge to deal more with Vanilla JS.

Remove dead code

If you already change something in the structure, you can use the opportunity directly to remove unnecessary and outdated code.

For this I made a list of all functions (there were 11 in total) and assigned a priority to each function.

I started with the important and essential functions and rewrote them in Vanilla JS.

Step by step. If you take over each function individually you might find errors or code that is no longer needed. You can delete them directly.

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This will tidy up your new JavaScript file at the same time and it is also directly beneficial to the clarity.

Convert jQuery Code

The site youmightnotneedjquery.com was especially helpful for the conversion to Vanilla JS. There you can compare direct functions in jQuery and JavaScript. I hope that with the help of my and this site you will be able to make the change without problems.

Now comes the announced list, with direct translations to convert jQuery to Vanilla JS

This list consists of the functions I used to switch on this one, partly there are overlaps with functions from the mentioned page.

1:1 jQuery to JavaScript translations

Document Ready Function

The function is called when the page is loaded. Thus, the execution of JavaScript does not block the page from loading.

// with jQuery
$(function() {
  /* ... */
  });


// Vanilla JS
function ready(fn) {
  if (document.readyState != 'loading'){
    fn();
  } else {
    document.addEventListener('DOMContentLoaded', fn);
  }
  }
ready(() => {
  /* ... */
  });

Selecting elements

The biggest difference when selecting elements is that in pure JavaScript you have to create a loop if there are multiple elements. In jQuery, for example, you can register events using the selector and it applies to all of them. More details in the section Event Handling.

// with jQuery
// multiple elements
let buttons = $('button.red-btn');

// one element
let button = $('button.green-btn');


// Vanilla JS
// multiple elements
let buttons = document.querySelectorAll('button.red-btn');

// one element
let button = document.querySelector('button.green-btn');

With parentNode you get the parent element. You can also string the statement together to get elements further up in the DOM – i.e. parentNode.parentNode.

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// with jQuery
let foobarParent = $('#foobar-container').parent();


// Vanilla JS
let foobarParent = document.querySelector('#foobar-container').parentNode;

Event Handling

For event handling you have to look if you have one or more elements. JQuery doesn’t care, it just registers the event. Here is an example for both situations.

// with jQuery
$('.link').click(function() {
  /* ... */
  });


// Vanilla JS
// one element
document.querySelector('#link').addEventListener('click', event => {
	/* ... */
	});

// more elements
document.querySelectorAll('.link').forEach(link => {
  link.addEventListener('click', event => {
  	/* ... */
  });
  });

To deregister events the actual event callback function is necessary in Vanilla JS. So if you register an event, you should create it in a separate callback function.

// with jQuery
$('#foobar').off('click');


// Vanilla JS
document.getElementById('foobar').removeEventListener('click', clickEvent);
function clickEvent(event) { }

Performing actions on elements

To achieve show() and hide(), we simply change the CSS property display accordingly.

// with jQuery
$('.foobar').show();


// Vanilla JS
document.querySelectorAll('.foobar').forEach(element => {
  element.style.display = 'block';
  });
// with jQuery
$('.foobar').hide();


// Vanilla JS
document.querySelectorAll('.foobar').forEach(element => {
  element.style.display = 'none';
  });

Querying and changing attributes of elements

The query and handling of the classes works as easy as with jQuery. Only the spelling is a bit different. If you need a toggleClass() function, you can easily program it yourself.

// with jQuery
if($('.foo').hasClass('bar')) {
  /* ... */
  }


// Vanilla JS
if(document.querySelector('.foo').classList.contains('bar')) {
  /* ... */
  }
// with jQuery
$('.foo').addClass('bar');


// Vanilla JS
document.querySelector('.foo').classList.add('bar');
// with jQuery
$('.foo').removeClass('bar');


// Vanilla JS
document.querySelector('.foo').classList.remove('bar');

The query of other attributes is also quite similar. Note that sometimes the output is different from the jQuery function.

// with jQuery
console.log($('.foobar').attr('checked')); // Output: checked/undefined


// Vanilla JS
console.log(document.querySelector('.foobar').checked); // Output: true/false
// with jQuery
$('.foobar').html();
$('.foobar').html('<span>Hello world!</span>');


// Vanilla JS
document.querySelector('.foobar').innerHTML;
document.querySelector('.foobar').innerHTML = '<span>Hello world!</span>';

Determine offsets and dimensions

// with jQuery
let offset = $(window).scrollTop();


// Vanilla JS
let offset = window.pageYOffset;
// with jQuery
$(window).width();


// Vanilla JS
parseFloat(getComputedStyle(document.querySelector('html'), null).width.replace("px", ""));
// with jQuery
$('.foobar').width();


// Vanilla JS
document.querySelector('.foobar').offsetWidth;
// with jQuery
$('.foobar').offset().top;


// Vanilla JS
document.querySelector('.foobar').offsetTop;

Styling of elements

For styles that are joined with a hyphen, you can use the Camel Case spelling. For example, justify-content becomes justifyContent.

// with jQuery
$('.foobar').css('display', 'flex');
$('.foobar').css('margin-top', '3rem');

let displayProperty = $('.foobar').css('display');


// Vanilla JS
document.querySelector('.foobar').style.display = 'flex';
document.querySelector('.foobar').style.marginTop = '3rem';

let element = document.querySelector('.foobar');
let elementStyle = getComputedStyle(element, null);
let displayProperty = elementStyle.display;

Create new elements

If you want to create new elements and add them to an element, you can do this as follows.

Individual attributes and classes must be added individually, described in more detail in the section Querying and changing attributes of elements.

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// with jQuery
$('.foo').append('<p class="child" id="child-id">bar</p>');


// Vanilla JS
let bar = document.createElement('p');
bar.classList.add('child');
bar.id = 'child-id';
bar.innerHTML = 'bar';
document.querySelector('.foo').appendChild(bar);

This is how the changeover looks in practice

This is most of the features I needed when I switched over.

But I would like to give you exclusively the JavaScript file of this page. Before and after switching to Vanilla JS.

Maybe you can use the one or other line of code. πŸ™‚

File before the change (jQuery)

$(function() {
	documentReady();
	});

// WHEN DOCUMENT LOADED
function documentReady() {
	// priavy container on visit begin
	if (
		!getCookie('cookie-state') ||
		getCookie('cookie-state') == undefined ||
		getCookie('cookie-state') == ''
	) {
		$('.privacy-popup').fadeIn(200);
		initCookieClicker();
	}
	$('.open-cookie-menu').click(function() {
		$('.privacy-popup').fadeIn(200);
		initCookieClicker();
		return false;
	});
	
	// set perfect image ratio
	setImageRatio();
	
	let resizeTimeout;
	$(window).resize(function() {
		clearTimeout(resizeTimeout);
		resizeTimeout = setTimeout(function() {
			setImageRatio();
		}, 200);
	});
	
	
	// remove ad containers
	setTimeout(function() {
	
	  var adblockEnabled = false;
	    
	  // add test element and get its styles
	  $('body').append('<div class="adBanner"></div>');
	  var adElement = document.getElementsByClassName('adBanner')[0];
	  var adElementStyle = getComputedStyle(adElement, null);
	  
	  
	  if(adElementStyle.display === 'none') {   // Adblock enabled
	  	$('.cwebdeasy-g-container').remove();
	  	$('.webd-f-container').remove();
	  }
	  
	}, 1500);	
	
	$(window).scroll(function() {
		let offset = $(window).scrollTop();
		if(offset > $('header#masthead').height()) {
			$('header#masthead').addClass('header-box-shadow');
		} else {
			$('header#masthead').removeClass('header-box-shadow');
		}
	});
	
	// show share icon on mobile
	if ($(window).width() < 768) {
		$('.social-icons.vertical .share-icon')
			.show()
			.click(function() {
				if ($('.social-icons.vertical a').is(':visible')) {
					$('.social-icons.vertical a').fadeOut(200);
				} else {
					$('.social-icons.vertical a').fadeIn(200);
				}
			});
	} else {
		setTimeout(function() {
			$('.social-icons.vertical a').fadeIn(400);
		}, 10000);
	}
	
	// collect menu data
	$('.menu-hauptmenue-container .sub-menu .menu-item a, .menu-hauptmenue-en-container .sub-menu .menu-item a').click(function() {
		_paq.push(['trackEvent', 'Desktop Menu', 'Click', 'Open: "' + $(this).html() + '"']);
	});
	
	// collect sidebar click
	$('.menu-sidebar-tutorials-de-container li a, .menu-sidebar-tutorials-en-container li a').click(function() {
		_paq.push(['trackEvent', 'Sidebar Tutorials Menu', 'Click', 'Open: "' + $(this).html() + '"']);
	});
	
	// collect sidebar click
	$('.sidebar-categories a, sidebar-categories a').click(function() {
		_paq.push(['trackEvent', 'Sidebar Categories Menu', 'Click', 'Open: "' + $(this).html() + '"']);
	});
	
	// collect InPost Menu click
	$('.interesting-container li a').click(function() {
		_paq.push(['trackEvent', 'Interesting InPost Menu', 'Click', 'Open: "' + $(this).html() + '"']);
	});
	
	// collect Table of contents click
	$('.table-of-contents li a').click(function() {
		_paq.push(['trackEvent', 'Table of contents', 'Click', 'Jump to: "' + $(this).html() + '"']);
	});
	
	// open mobile menu
	let mobileMenuTimeout;
	$('.mobile-menu-button').click(function() {
		if (mobileMenuTimeout) return false;
		
		clearTimeout(mobileMenuTimeout);
		mobileMenuTimeout = setTimeout(function() {
			mobileMenuTimeout = null;
		}, 200);
		
		if ($(this).hasClass('open')) {
			$(this).removeClass('open');
			$(
				'.menu-hauptmenue-container, .menu-hauptmenue-en-container'
			).slideUp(200);
			$('.mobile-menu-bg-overlay').fadeOut();
		} else {
			$(this).addClass('open');
			$(
				'.menu-hauptmenue-container, .menu-hauptmenue-en-container'
			).slideDown(200);
			$('.mobile-menu-bg-overlay').fadeIn();
			$('.mobile-menu-bg-overlay')
				.off('click')
				.click(function() {
					$('.mobile-menu-button').click();
				});
				
			// open submenu
			if (
				!$('.main-menu .submenu-expand')
					.siblings('.sub-menu')
					.is(':visible')
			) {
				$('.main-menu .submenu-expand')
					// .first()
					.click();
			}
			
			_paq.push(['trackEvent', 'Menu', 'Click', 'Open mobile menu']);
		}
	});
	
	$('.main-menu .submenu-expand').click(function() {
		if ($(window).width() < 1200) {
			$(this)
				.siblings('.sub-menu')
				.slideToggle();
				
			// _paq.push(['trackEvent', 'Menu', 'Click', 'Toggle submenu']);
		}
	});
	
	// minimize code blocks
	$('.wp-block-code, .enlighter-default').each(function() {
		if ($(this).height() >= 450) {
			$(this)
				.children('code')
				.css('height', '450px');
				
			$(this)
				.children('.enlighter')
				.css('display', 'block')
				.css('height', '470px');
				
			$(this)
				.css('height', '545px');
				
			$(this).append(
				'<span class="expand-code btn btn-block btn-sm btn-outline-primary mt-2">' +
					(lang === 'de' ? 'Aufklappen' : 'Expand') +
					'</span>'
			);
		}
	});
	
	// expand code
	$('.expand-code').click(function() {
		if ($(this).hasClass('open')) {
			$(this)
				.siblings('code')
				.css('height', '450px');
			$(this)
				.siblings('.enlighter')
				.css('height', '470px');
			$(this)
				.parent('.enlighter-default')
				.css('height', '545px');
			$(this)
				.removeClass('open')
				.html(lang === 'de' ? 'Aufklappen' : 'Expand');
				
			// _paq.push(['trackEvent', 'Code', 'Click', 'Minified View']);
		} else {
			$(this)
				.siblings('code')
				.css('height', 'auto');
			$(this)
				.siblings('.enlighter')
				.css('height', 'auto');
			$(this)
				.parent('.enlighter-default')
				.css('height', 'auto');
			$(this)
				.addClass('open')
				.html(lang === 'de' ? 'Zuklappen' : 'Collapse');
				
			// _paq.push(['trackEvent', 'Code', 'Click', 'Full View']);
		}
		return false;
	});
	
	// smooth scroll on anchor click
	$('a[href^="#"]').click(function() {
		var elementName = $(this)
			.attr('href')
			.replace('#', '');
			
		if(elementName == undefined || elementName == '') return false;
		
		var element = $('#' + elementName);
		
		if (!element.length) {
			return false;
		}
		
		var elementOffset = element.offset().top - 110;
		
		$('html, body').animate({ scrollTop: elementOffset }, 'slow');
		location.replace('#' + elementName);
		return false;
	});
	
	let sidebarScrollEnabled = true;
	let windowScrollTimeout;
	$(window).scroll(() => {
		clearTimeout(windowScrollTimeout);
		sidebarScrollEnabled = false;
		windowScrollTimeout = setTimeout(() => {
			sidebarScrollEnabled = true;
		}, 1000);
	});
	
	setInterval(() => {
		if($(window).width() > 768 && sidebarScrollEnabled) {
			let offset = $(window).scrollTop();
			
			if($('.single-after-content').offset().top < offset) return false;
			
			let adHeight = 0;
			if($('.cwebdeasy-g-container').length) adHeight = $('.cwebdeasy-g-container').height() + 120;
			
			$('.sidebar-outer-box .js-to-top-container').css('margin-top', (offset - adHeight - 50) + 'px');
		}
	}, 5*1000);
	
	// lightbox
	$('figure > a > picture > img').click(function() {
		if ($(this).attr('src') != '') {
			$('.lightbox .img-container').html(
				'<div class="close">βœ–</div><img loading="lazy" src="' +
					$(this).attr('src') +
					'"><p>' +
					$(this).attr('alt') +
					'</p>'
			);
			$('.lightbox').fadeIn();
			
			// _paq.push(['trackEvent', 'Lightbox', 'Click', 'Open Lightbox']);
			
			// register close event
			$('.lightbox .close, .lightbox .bg-overlay')
				.off('click')
				.click(function() {
					$('.lightbox').fadeOut();
				});
		}
		return false;
	});
	}

function initCookieClicker() {
	$('.privacy-popup .privacy-container #accept-cookies')
		.off('click')
		.click(function() {
			setCookie('cookie-state', 'all', 7);
			
			// matomo opt in
			_paq.push(['forgetUserOptOut']);
			
			// _paq.push(['trackEvent', 'Cookie Setting', 'Click', 'Accept all']);
			
			$('.privacy-popup').fadeOut(200);
			return false;
		});
	$('.privacy-popup .privacy-container #necessary-cookies')
		.off('click')
		.click(function() {
			setCookie('cookie-state', 'necessary', 7);
			
			// _paq.push([
			// 	'trackEvent',
			// 	'Cookie Setting',
			// 	'Click',
			// 	'Accept necessary'
			// ]);
			
			// matomo opt out
			_paq.push(['optUserOut']);
			
			// remove dark mode option
			// $('.dark-mode-switcher').remove();
			// setCookie('theme', '', 0);
			
			$('.privacy-popup').fadeOut(200);
			return false;
		});
	$('.privacy-popup .privacy-container #show-cookies')
		.off('click')
		.click(function() {
			$('.privacy-popup .more-cookie-infos').fadeToggle();
			return false;
		});
		}

function setImageRatio() {
	// normal preview
	let imageElements = document.querySelectorAll('.post-preview-container .header-container');
	
	if(imageElements.length) {
		let width = imageElements[0].offsetWidth;
		let height = width / 2;
		for(let i = 0; i < imageElements.length; i++) {
			imageElements[i].style.height = height + 'px';
		}
	}
	
	// // small images
	let smallImageElements = document.querySelectorAll('.post-preview-container .horizontal-look > a');
	
	if(smallImageElements.length) {
		width = smallImageElements[0].offsetWidth;
		height = width / 2;
		for(let i = 0; i < smallImageElements.length; i++) {
			smallImageElements[i].style.height = height + 'px';
		}
	}
	}

function getCookie(cname) {
	var name = cname + '=';
	var decodedCookie = decodeURIComponent(document.cookie);
	var ca = decodedCookie.split(';');
	for (var i = 0; i < ca.length; i++) {
		var c = ca[i];
		while (c.charAt(0) == ' ') {
			c = c.substring(1);
		}
		if (c.indexOf(name) == 0) {
			return c.substring(name.length, c.length);
		}
	}
	return '';
	}

function setCookie(cname, cvalue, exdays) {
	var d = new Date();
	d.setTime(d.getTime() + exdays * 24 * 60 * 60 * 1000);
	var expires = 'expires=' + d.toUTCString();
	document.cookie = cname + '=' + cvalue + ';' + expires + ';path=/';
	}

File after the change (JavaScript)

let sidebarScrollEnabled = true;


ready(() => {

	// priavy container on visit begin
	if (!getCookie('cookie-state') || getCookie('cookie-state') == undefined || getCookie('cookie-state') == '') {
		openCookieMenu();
	}
	
	
	// open cookie menu
	document.querySelectorAll('.open-cookie-menu').forEach(cookieMenu => {
		cookieMenu.addEventListener('click', openCookieMenu);
	});
	
	
	// set perfect image ratio
	setImageRatio();
	
	
	// position share buttons
	positionSocialIcons();
	
	
	// set perfect image ratio on resize
	let resizeTimeout;
	window.addEventListener('resize', () => {
		clearTimeout(resizeTimeout);
		resizeTimeout = setTimeout(() => {
			setImageRatio();
			positionSocialIcons();
		}, 200);
	});
	
	
	// toggle mobile submenus
	document.querySelectorAll('.main-menu .submenu-expand').forEach(expander => {
		expander.addEventListener('click', toggleMobileSubMenus);
	});
	
	
	// toggle mobile menu
	document.querySelector('.mobile-menu-button').addEventListener('click', toggleMobileMenu);
	
	
	// remove ad containers
	setTimeout(checkAdblock, 1500);
	
	
	// show shadow in header
	window.addEventListener('scroll', () => {
		toggleHeaderShadow();
	}, {passive: true});
	
	
	// sidebar scroll actions: TODO
	let windowScrollTimeout;
	window.addEventListener('scroll', () => {
		clearTimeout(windowScrollTimeout);
		sidebarScrollEnabled = false;
		windowScrollTimeout = setTimeout(() => {
			sidebarScrollEnabled = true;
		}, 1000);
	}, {passive: true});
	
	setInterval(() => {
		execSidebarMovementActions();
	}, 7*1000);
	
	
	// lightbox
	document.querySelectorAll('figure > a > picture > img, figure > a > img').forEach(lightboxLink => {
		lightboxLink.addEventListener('click', openLightbox);
	});
	
	
	// show social icons
	showSocialIcons(parseFloat(getComputedStyle(document.querySelector('html'), null).width.replace("px", "")) <= 768);
	
	
	// collect matomo data
	registerMatomoEventListeners();
	
	
	// minimize code blocks
	document.querySelectorAll('.wp-block-code, .enlighter-default').forEach(codeblock => {
		minimizeCodeblocks(codeblock);
	});
	
	
	// scroll to (with offset)
	document.querySelectorAll('a[href^="#"').forEach(anchorLink => {
		anchorLink.addEventListener('click', anchorClick);
	});
	
	
	// smooth scroll on page load
	setTimeout(() => {
		if(location.hash) {
			window.scrollTo(0, 0);
			let target = location.hash.split('#');
			customScrollTo(document.getElementById(target[1]));
		}
	}, 200);
	
	});


/* FUNCTION AREA */
function ready(fn) {
  if (document.readyState != 'loading'){
    fn();
  } else {
    document.addEventListener('DOMContentLoaded', fn);
  }
  }

function positionSocialIcons() {
	let iconWrapper = document.querySelector('.social-icons-fixed .social-icons');
	
	if(!iconWrapper) return false;
	
	if(parseFloat(getComputedStyle(document.querySelector('html'), null).width.replace("px", "")) < 768) {
		iconWrapper.style.left = 'inherit';
		iconWrapper.style.top = 'inherit';
		iconWrapper.style.bottom = '1rem';
		iconWrapper.style.right = '1rem';
	} else {
		let blogpost = document.getElementsByClassName('post')[0];
		iconWrapper.style.right = 'inherit';
		iconWrapper.style.bottom = 'inherit';
		iconWrapper.style.left = (blogpost.offsetLeft - 60) + 'px';
		iconWrapper.style.top = '100px';
	}
	}

function anchorClick(event) {
	event.preventDefault();
	let hrefSplit = event.target.href.split('#');
	let elementID = hrefSplit[1];
	
	if(elementID == undefined || elementID == '') return false;
	
	let element = document.getElementById(elementID);
	
	customScrollTo(element);
	}

function customScrollTo(element) {
	location.replace('#' + element.id);
	
	if (element == null) return false;
	
	var elementOffset = element.getBoundingClientRect().top + window.pageYOffset - 110
	
	window.scrollTo({
		top: elementOffset,
		behavior: 'smooth'
	});
	
	}

function expandCode(event) {
	event.preventDefault();
	
	if(event.target.classList.contains('open')) {	// minimize code
		event.target.parentNode.querySelector('.enlighter').style.height = '470px';
		event.target.parentNode.style.height = '534px';
		
		event.target.classList.remove('open');
		event.target.innerHTML = (lang === 'de' ? 'Aufklappen' : 'Expand');
	} else {	// maximize code
		event.target.parentNode.querySelector('.enlighter').style.height = 'auto';
		event.target.parentNode.style.height = 'auto';
		
		event.target.classList.add('open');
		event.target.innerHTML = (lang === 'de' ? 'Zuklappen' : 'Collapse');
	}
	}

function minimizeCodeblocks(codeblock) {
	if(codeblock.offsetHeight >= 450) {
		codeblock.querySelector('.enlighter').style.height = '470px';
		codeblock.querySelector('.enlighter').style.display = 'block';
		codeblock.style.height = '534px';
		
		let expandButton = document.createElement('span');
		expandButton.classList.add('expand-code');
		expandButton.classList.add('btn');
		expandButton.classList.add('btn-block');
		expandButton.classList.add('btn-sm');
		expandButton.classList.add('btn-primary');
		expandButton.classList.add('mt-2');
		expandButton.innerHTML = (lang === 'de' ? 'Aufklappen' : 'Expand');
		expandButton.onclick = expandCode;
		codeblock.appendChild(expandButton);
	}
	}



function registerMatomoEventListeners() {
	// collect menu data
	document.querySelectorAll('.menu-hauptmenue-container .sub-menu .menu-item a, .menu-hauptmenue-en-container .sub-menu .menu-item a').forEach(elem => {
		elem.addEventListener('click', () => {
			_paq.push(['trackEvent', 'Desktop Menu', 'Click', 'Open: "' + elem.innerHTML + '"']);
		});
	});
	
	
	// collect sidebar click
	document.querySelectorAll('.menu-sidebar-tutorials-de-container li a, .menu-sidebar-tutorials-en-container li a').forEach(elem => {
		elem.addEventListener('click', () => {
			_paq.push(['trackEvent', 'Sidebar Tutorials Menu', 'Click', 'Open: "' + elem.innerHTML + '"']);
		});
	});
	
	
	// collect sidebar click
	document.querySelectorAll('.sidebar-categories a, sidebar-categories a').forEach(elem => {
		elem.addEventListener('click', () => {
			_paq.push(['trackEvent', 'Sidebar Categories Menu', 'Click', 'Open: "' + elem.innerHTML + '"']);
		});
	});
	
	
	// collect InPost Menu click
	document.querySelectorAll('.interesting-container li a').forEach(elem => {
		elem.addEventListener('click', () => {
			_paq.push(['trackEvent', 'Interesting InPost Menu', 'Click', 'Open: "' + elem.innerHTML + '"']);
		});
	});
	
	
	// collect Table of contents click
	document.querySelectorAll('.table-of-contents li a').forEach(elem => {
		elem.addEventListener('click', () => {
			_paq.push(['trackEvent', 'Table of contents', 'Click', 'Jump to: "' + elem.innerHTML + '"']);
		});
	});
	
	// collect logo click
	document.querySelectorAll('.custom-logo-link').forEach(elem => {
		elem.addEventListener('click', () => {
			_paq.push(['trackEvent', 'Link', 'Click', 'Logo Click']);
		});
	});
	}

function showSocialIcons(mobile) {
	if (mobile) {
		document.querySelectorAll('.social-icons.vertical .share-icon').forEach(icon => {
			icon.classList.add('wd-show');
			icon.addEventListener('click', () => {
				document.querySelectorAll('.social-icons.vertical a').forEach(iconElement => {
				
					if(iconElement.classList.contains('wd-show')) {
						iconElement.classList.remove('wd-show');
					} else {
						iconElement.classList.add('wd-show');
					}
					
				});
			});
		});
	} else {
		setTimeout(function() {
			document.querySelectorAll('.social-icons.vertical a').forEach(icon => {
				icon.classList.add('wd-show');
			});
		}, 5000);
	}
	}

function openLightbox(event) {
	event.preventDefault();
	
	if(event.target.src != '') {
		let lightboxContent = '<div class="close">βœ–</div><img loading="lazy" src="' + event.target.src + '"><p>' + event.target.alt + '</p>';
		let lightboxContainer = document.querySelector('.lightbox .img-container');
		
		lightboxContainer.innerHTML = lightboxContent;
		document.querySelector('.lightbox').classList.add('wd-show');
		
		// _paq.push(['trackEvent', 'Lightbox', 'Click', 'Open Lightbox']);
		
		let closeElements = document.querySelectorAll('.lightbox .close, .lightbox .bg-overlay');
		closeElements.forEach(closeElement => {
			closeElement.removeEventListener('click', closeLightboxEvent);
			closeElement.addEventListener('click', closeLightboxEvent);
		})
	}
	}

function closeLightboxEvent() {
	document.querySelector('.lightbox').classList.remove('wd-show');
	}

function execSidebarMovementActions() {
	let jsToTopContainer = document.querySelector('.sidebar-outer-box .js-to-top-container');
	
	if(parseFloat(getComputedStyle(document.querySelector('html'), null).width.replace("px", "")) > 1200 && sidebarScrollEnabled) {
		let offset = window.pageYOffset;
		let singleAfterContent = document.querySelector('.single-after-content');
		let singleAfterContentViewport = singleAfterContent.getBoundingClientRect();
		let singleAfterContentOffset = singleAfterContentViewport.top + window.scrollY;
		let margin = 110;
		let sidebarAd = document.querySelector('.sidebar-box.cwebdeasy-g-container');
		
		if(sidebarAd) {
		
			let sidebarAdHeight = sidebarAd.offsetHeight;
			let sidebarAdOffsetBottom = sidebarAd.getBoundingClientRect().top + sidebarAdHeight;
			if(sidebarAd) margin += sidebarAdHeight;
			
			if(window.pageYOffset < margin) {
				jsToTopContainer.style.marginTop = '1rem';
			} else {
				jsToTopContainer.style.marginTop = (window.pageYOffset - margin) + 'px';
			}
			
		} else {
			jsToTopContainer.style.marginTop = (window.pageYOffset - margin) + 'px';
		}
		
	} else if(parseFloat(getComputedStyle(document.querySelector('html'), null).width.replace("px", "")) <= 1200) {
		jsToTopContainer.style.marginTop = '0px';
	}
	}

function toggleHeaderShadow() {
	let offset = window.pageYOffset;
	let header = document.querySelector('header#masthead');
	
	if(offset > header.offsetHeight) {
		header.classList.add('header-box-shadow');
	} else {
		header.classList.remove('header-box-shadow');
	}
	}

function checkAdblock() {
	let adblockEnabled = false;
	
	let adCheckElement = document.createElement('div');
	adCheckElement.classList.add('adBanner');
	document.querySelector('body').appendChild(adCheckElement);
	
	let adElement = document.getElementsByClassName('adBanner')[0];
  	let adElementStyle = getComputedStyle(adElement, null);
  	
  	if(adElementStyle.display === 'none') {   // Adblock enabled
  		document.querySelectorAll('.cwebdeasy-g-container').forEach(adElement => {
  			adElement.remove();
  		});
  		document.querySelectorAll('.webd-f-container').forEach(adElement => {
  			adElement.remove();
  		});
  	}
  	}

function openCookieMenu() {
	document.querySelector('.privacy-popup').classList.add('wd-show');
	initCookieClicker();
	}

function initCookieClicker() {
	let acceptCookiesButton = document.querySelector('.privacy-popup .privacy-container #accept-cookies');
	let necessaryCookiesButton = document.querySelector('.privacy-popup .privacy-container #necessary-cookies');
	let showCookiesButton = document.querySelector('.privacy-popup .privacy-container #show-cookies');
	
	acceptCookiesButton.removeEventListener('click', acceptCookiesButtonAction);
	acceptCookiesButton.addEventListener('click', acceptCookiesButtonAction);
	
	necessaryCookiesButton.removeEventListener('click', necessaryCookiesButtonAction);
	necessaryCookiesButton.addEventListener('click', necessaryCookiesButtonAction);
	
	showCookiesButton.removeEventListener('click', showCookiesButtonAction);
	showCookiesButton.addEventListener('click', showCookiesButtonAction);
	}

function acceptCookiesButtonAction() {
	setCookie('cookie-state', 'all', 7);
	
	_paq.push(['forgetUserOptOut']);
	
	document.querySelector('.privacy-popup').classList.remove('wd-show');
	}

function necessaryCookiesButtonAction() {
	setCookie('cookie-state', 'necessary', 7);
	
	_paq.push(['optUserOut'])
	
	document.querySelector('.privacy-popup').classList.remove('wd-show');
	}

function showCookiesButtonAction() {
	let cookieInfos = document.querySelector('.privacy-popup .more-cookie-infos');
	if(cookieInfos.classList.contains('wd-show')) {
		cookieInfos.classList.remove('wd-show');
	} else {
		cookieInfos.classList.add('wd-show');
	}
	}

function setImageRatio() {
	// normal preview
	let imageElements = document.querySelectorAll('.post-preview-container .header-container');
	
	if(imageElements.length) {
		let width = imageElements[0].offsetWidth;
		let height = width / 2;
		for(let i = 0; i < imageElements.length; i++) {
			imageElements[i].style.height = height + 'px';
		}
	}
	
	// // small images
	let smallImageElements = document.querySelectorAll('.post-preview-container .horizontal-look > a');
	
	if(smallImageElements.length) {
		width = smallImageElements[0].offsetWidth;
		height = width / 2;
		for(let i = 0; i < smallImageElements.length; i++) {
			smallImageElements[i].style.height = height + 'px';
		}
	}
	}

function getCookie(cname) {
	var name = cname + '=';
	var decodedCookie = decodeURIComponent(document.cookie);
	var ca = decodedCookie.split(';');
	for (var i = 0; i < ca.length; i++) {
		var c = ca[i];
		while (c.charAt(0) == ' ') {
			c = c.substring(1);
		}
		if (c.indexOf(name) == 0) {
			return c.substring(name.length, c.length);
		}
	}
	return '';
	}

function setCookie(cname, cvalue, exdays) {
	var d = new Date();
	d.setTime(d.getTime() + exdays * 24 * 60 * 60 * 1000);
	var expires = 'expires=' + d.toUTCString();
	document.cookie = cname + '=' + cvalue + ';' + expires + ';path=/';
	}

function toggleMobileSubMenus(event) {
	event.preventDefault();
	
	if(parseFloat(getComputedStyle(document.querySelector('html'), null).width.replace("px", "")) < 1200) {
	
		let childs = event.target.parentNode.parentNode.children;
		
		for(let i = 0; i < childs.length; i++) {
		
			if(childs[i].classList.contains('sub-menu')) {
			
				if(childs[i].classList.contains('wd-show')) {
					childs[i].classList.remove('wd-show');
				} else {
					childs[i].classList.add('wd-show');
				}
				
			}
			
		}
		
	}
	}

function toggleMobileMenu(event) {
	event.preventDefault();
	let button = document.querySelector('.mobile-menu-button');
	let mobileMenuOverlay = document.querySelector('.mobile-menu-bg-overlay');
	
	
	if(button.classList.contains('open')) {	// close menu
		button.classList.remove('open');
		
		document.querySelectorAll('.menu-hauptmenue-container, .menu-hauptmenue-en-container').forEach(menu => {
			menu.classList.remove('wd-show');
		});
		
		mobileMenuOverlay.classList.remove('wd-show');
		mobileMenuOverlay.removeEventListener('click', mobileMenuOverlayClick);
		
	} else {	// open menu
		button.classList.add('open');
		
		document.querySelectorAll('.menu-hauptmenue-container, .menu-hauptmenue-en-container').forEach(menu => {
			menu.classList.add('wd-show');
		});
		
		mobileMenuOverlay.classList.add('wd-show');
		mobileMenuOverlay.addEventListener('click', mobileMenuOverlayClick);
		
		_paq.push(['trackEvent', 'Menu', 'Click', 'Open mobile menu']);
		
	}
	}

function mobileMenuOverlayClick() {
	var event = document.createEvent('HTMLEvents');
	event.initEvent('click', true, false);
	document.querySelector('.mobile-menu-button').dispatchEvent(event);
	}

I think it also makes it clear what I mean by cleaning up code.

Of course, the goal should always be to make code as maintainable as possible. But such files grow historically and of course it’s my own fault that such a chaos arises…

Is it even worth the effort?

In my eyes: Yes! Besides cleaning up my code, I have directly removed unnecessary functions. That makes the visitors of your site happy, too.

I thought you couldn’t do it without jQuery. But if you really want to get everything out of your side, this is a good move.

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