Smooth Accordion Slider with jQuery and CSS/CSS3

Smooth Accordion Slider with jQuery and CSS/CSS3
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License: MIT
   

A HTML/CSS/jQuery accordion widget that uses CSS3 transitions to smoothly expand one content panel at a time. 

How to use it:

1. The essential accordion structure.

<div id="accordion">
  <ul class="panels">
    <li data-panel-id="panel1">Header 1</li>
    <div class="panel panel1"> <a href="#">Panel 1</a>
      <p>This is the content for panel 1</p>
    </div>
    <li data-panel-id="panel2">Header 2</li>
    <div class="panel panel2"> <a href="#">Panel 2</a>
      <p>This is the content for panel 2</p>
    </div>
    <li data-panel-id="panel3">Header 3</li>
    <div class="panel panel3"> <a href="#">Panel 3</a>
      <p>This is the content for panel 3</p>
    </div>
    <li data-panel-id="panel4">Header 4</li>
    <div class="panel panel4"> <a href="#">Panel 4</a>
      <p>This is the content for panel 4</p>
    </div>
  </ul>
</div>

2. The required CSS/CSS3 rules to style the accordion widget.

#accordion ul {
  text-align: center;
  margin: 0;
}

#accordion ul li {
  list-style-type: none;
  cursor: pointer;
  padding: 0.4em;
  font-size: 1.4em;
  color: white;
  letter-spacing: 0.2em;
  transition: 0.3s ease all;
  text-shadow: -1px 0 grey, 0 1px grey, 1px 0 grey, 0 -1px grey;
}

.panel {
  display: none;
  padding: 25px;
  border: 3px #bfbfbf solid;
  margin: 10px;
  font-family: "roboto", sans-serif;
  padding: 0.4em;
  font-size: 1.4em;
  color: white;
  letter-spacing: 0.2em;
  background-color: white;
  color: #333;
}

3. Place the necessary jQuery library at the bottom of the webpage.

<script src="//code.jquery.com/jquery-2.1.3.min.js"></script>

4. The core JavaScript to enable the accordion.

$(function() {

  var $navLink = $('#accordion').find('li');

  $navLink.on('click', function() {
    var panelToShow = $(this).data('panel-id');
    var $activeLink = $('#accordion').find('.active');

    // show new panel
    // .stop is used to prevent the animation from repeating 
    // if you keep clicking the same link
    $('.' + panelToShow).stop().slideDown();
    $('.' + panelToShow).addClass('active');


    // hide the previous panel 
    $activeLink.stop().slideUp()
    .removeClass('active');

  });

});

This awesome jQuery plugin is developed by MarkShakespeare. For more Advanced Usages, please check the demo page or visit the official website.