jQuery CSS3 folding card drop-down list box to achieve effect_jquery

The jQuery drop-down list box special effect makes each list item look like a card. Opening and closing it has the feeling of opening and closing blinds. The effect is very good. I would like to share it with everyone.

Brief tutorial
HTML structure
The list items of this drop-down list box effect are made using an unordered list, and the element used to switch the open and closed states is a hyperlink element.

<div class="container">
 <div class="card-drop">
  <a class='toggle' href="#">
   <i class='fa fa-suitcase'></i> 
   <span class='label-active'>Everyting</span>
  </a>
  <ul>
   <li class='active'>
    <a data-label="Everyting" href="#"><i class='fa fa-suitcase'></i> Everyting</a>
   </li>
   ......
  </ul>
 </div>
</div>

CSS style
The a.toggle element is used to switch the open and closed state of the drop-down list. In order to create the effect of flipping the card up when clicked, it is set with the transform-style: preserve-3d; attribute. At the same time, the origin of the transformation transform-origin: 50% 0%; is modified.

.card-drop > a.toggle {
 position: relative;
 z-index: 100;
 -moz-backface-visibility: hidden;
 -webkit-backface-visibility: hidden;
 backface-visibility: hidden;
 -moz-transform-style: preserve-3d;
 -webkit-transform-style: preserve-3d;
 transform-style: preserve-3d;
 -moz-transform-origin: 50% 0%;
 -ms-transform-origin: 50% 0%;
 -webkit-transform-origin: 50% 0%;
 transform-origin: 50% 0%;
 -moz-transition: linear 0.1s;
 -o-transition: linear 0.1s;
 -webkit-transition: linear 0.1s;
 transition: linear 0.1s;
}       

But when it is active, it will rotate along the X-axis and use :before and :after pseudo-elements to create a corner triangle effect.

.card-drop > a.toggle:active {
 -moz-transform: rotateX(60deg);
 -webkit-transform: rotateX(60deg);
 transform: rotateX(60deg);
}
.card-drop > a.toggle:active:after {
 -moz-transform: rotateX(180deg);
 -webkit-transform: rotateX(180deg);
 transform: rotateX(180deg);
}
.card-drop > a.toggle:before, .card-drop > a.toggle:after {
 content: "";
 position: absolute;
}
.card-drop > a.toggle:before {
 right: 25px;
 top: 50%;
 margin-top: -2.5px;
 border-left: 6px solid transparent;
 border-right: 6px solid transparent;
 border-top: 6px solid rgba(0, 0, 0, 0.8);
}
.card-drop > a.toggle.active:before {
 transform: rotate(180deg);
}        

When switching list items, simply use jQuery to modify their top, width and margin-left properties to show and hide them. And use ease-out as CSS animation transition effect.

.card-drop ul {
 position: absolute;
 height: 100%;
 top: 0;
 display: block;
 width: 100%;
}
.card-drop ul li {
 margin: 0 auto;
 -moz-transition: all, ease-out 0.3s;
 -o-transition: all, ease-out 0.3s;
 -webkit-transition: all, ease-out 0.3s;
 transition: all, ease-out 0.3s;
 position: absolute;
 top: 0;
 z-index: 0;
 width: 100%;
}
.card-drop ul li a {
 border-top: none;
}
.card-drop ul li a:hover {
 background-color: #4aa3df;
 color: #f3f9fd;
}
.card-drop ul li.active a {
 color: #fff;
 background-color: #258cd1;
 cursor: default;
}
.card-drop ul li.closed a:hover {
 cursor: default;
 background-color: #3498db;
}        

JavaScript

In jQuery code, the setClosed() function is used to close all list items, and they are closed by default.

function setClosed() {
  li.each(function (index) {
    $(this).css('top', index * 4).css('width', width - index * 0.5 + '%').css('margin-left', index * 0.25 + '%');
  });
  li.addClass('closed');
  toggler.removeClass('active');
}
setClosed();        

Then listen to the mousedown event of the .toggle element, which switches the open and closed state of the list.

toggler.on('mousedown', function () {
  var $this = $(this);
  if ($this.is('.active')) {
    setClosed();
  } else {
    $this.addClass('active');
    li.removeClass('closed');
    li.each(function (index) {
      $(this).css('top', 60 * (index + 1)).css('width', '100%').css('margin-left', '0px');
    });
  }
});        

Finally, when each list item is clicked, the content of the list item is moved to the first item, and the entire list is closed.

links.on('click', function (e) {
  var $this = $(this), label = $this.data('label');
  icon = $this.children('i').attr('class');
  li.removeClass('active');
  if ($this.parent('li').is('active')) {
    $this.parent('li').removeClass('active');
  } else {
    $this.parent('li').addClass('active');
  }
  toggler.children('span').text(label);
  toggler.children('i').removeClass().addClass(icon);
  setClosed();
  e.preventDefault;
});        

The above is the effect created by jQuery and CSS3 for everyone. It is a very cool drop-down list box effect. I hope you like it