Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <aside id="archives" class="widget widget_archive">
  <h3 class="widget-title">Archivos</h3>
  <ul>
    <li><a href="#">2015</a>
      <i class="fa fa-angle-down"></i>
      <ul>
        <li><a href="#">febrero 2015</a></li>
        <li><a href="#">enero 2015</a></li>
      </ul>
    </li>
    <li><a href="#">2014</a>
      <i class="fa fa-angle-down"></i>
      <ul class="hide">
        <li><a href="#">diciembre 2014</a></li>
        <li><a href="#">noviembre 2014</a></li>
        <li><a href="#">marzo 2014</a></li>
        <li><a href="#">febrero 2014</a></li>
        <li><a href="#">enero 2014</a></li>
      </ul>
    </li>
    <li><a href="#">2013</a>
      <i class="fa fa-angle-down"></i>
      <ul class="hide">
        <li><a href="#">diciembre 2013</a></li>
        <li><a href="#">septiembre 2013</a></li>
      </ul>
    </li>
  </ul>
</aside>
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Lato);

body {
  font-family: 'Lato', sans-serif;
}

.fa-angle-down {
  transition: all .3s ease-in-out;
}

.widget {
  width:60%;
  margin:50px auto 0 auto;
  border:4px solid rgba(10,10,10,0.05);
  padding:10px;
  border-radius:10px;
  -webkit-box-shadow: 10px 10px 45px -20px rgba(0,0,0,0.75);
  -moz-box-shadow: 10px 10px 45px -20px rgba(0,0,0,0.75);
  box-shadow: 10px 10px 45px -20px rgba(0,0,0,0.75);
}

.widget-title {
  font-weight:bold;
  text-transform:uppercase;
  color:#636363;
  padding-bottom:10px
}

.widget a {
  color:#9b9b9b;
  text-decoration:none;
  padding:10px 0 10px 10px;
  display:inline-block;
}

.widget i {
  color: #9b9b9b;
  padding:10px 16px;
  float:right;
  line-height:1.5;
}

.widget i:hover {
  cursor: pointer;
  color:#444;   
}

.widget a:hover {
  color:#444
}

.widget ul {
  list-style-type:none;
  margin:0;
  padding:0;
  background-color:#eee;
}

.widget ul li:first-child .fa-angle-down {
  -moz-transform: rotate(180deg);
  -ms-transform: rotate(180deg);
  -webkit-transform: rotate(180deg); 
  transform: rotate(180deg);
}

.widget ul {
  line-height:1.5;
}

.widget li {
  border-top:1px solid #ccc;
}

.widget li li {
  line-height:1.5;
  border-top:1px solid #eaeaea;
  background-color:#fff;
}

.widget > ul li:first-child 
li a:first-child {
  display:inline-block;
}

.hide {
  display:none;
}
              
            
!

JS

              
                /* 

Reviewed on http://codereview.stackexchange.com/questions/83940/minimalist-accordion-implementation-using-vanilla-javascript 

http://sonnyt.com/javascript-check-if-element-has-class/

*/

var el = document.getElementById("archives");
var hook = el.getElementsByClassName("fa");
var rotated;

for (var i = 0; i < hook.length; i++) {
	hook[i].addEventListener("click",Toogle);
}

function Toogle() {
    'use strict';
  if (this.nextElementSibling.nodeType === 1 && hasClass(this.nextElementSibling,"hide")) { 
    if (this.nextElementSibling.classList) {
      this.nextElementSibling.classList.remove('hide');
    } else {
      this.nextElementSibling.className = this.nextElementSibling.className.replace(new RegExp('(^|\\b)' + "hide" + '(\\b|$)', 'gi'), ' ');
    }
    rotated = false;
  }
  else {    
    this.nextElementSibling.className += " " + "hide";
    rotated = true;
  }
  
  var deg = rotated ? 0 : 180;
    
  this.style.transform = 'rotate('+deg+'deg)';     
}

function hasClass (el, className){
  return el.className && new RegExp("(^|\\s)" + className + "(\\s|$)").test(el.className);
}
              
            
!
999px

Console