Free

const $pdfs = $('a[href$=".pdf"]');
$pdfs.on('click', function(event){
  //check if checkbox has been checked 
  //if zero checkboxes are checked 
  if ($(':checked').length === 0){
    //prevent download of document 
    event.preventDefault();
    //alert the user 
    alert('Please check the box to allow PDF downloads.');
  }
});

//Select every second link
const $odd = $('a:odd');

//Select all secure links
const $secureLinks = $('a[href^="https://"]');

//Select all links that ends with .pdf
const $pdfs = $('a[href$=".pdf"]');

//Add target blank attribute to every secure link
$secureLinks.attr('target', '_blank');

//Make downloadable pdf-s instead of open it in the browser
$pdfs.attr('download', true);

HTML

<div class="switch-wrapper">
                    <label class="switch">
                      <input id="map-switcher" type="checkbox" checked>
                      <span class="slider round"></span>
                    </label>
                    <div class="switch-map">
                        Térkép
                    </div>
               </div>

CSS

/*SWITCH*/
.switch-wrapper {
	width: 60px;
	display: block;
	margin: auto;
	margin-top: -20px;
}
.switch-map {
	width: 60px;
    margin-top: 20px;
}
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
    transform: rotate(90deg);
}


.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

input:checked + .slider {
  background-color: #28122E;
}

input:focus + .slider {
  box-shadow: 0 0 1px #28122E;
}

input:checked + .slider:before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}

/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}
.switch-wrapper {
	position: absolute;
	left: 0;
	right: 0;
}

JS

jQuery('#map-switcher').change(function(){
    if ($(this).is(':checked')) {
    jQuery(".hide-with-switch").show();
  } else {
    jQuery(".hide-with-switch").hide();
  }
});