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CSS

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HTML 

              
                <h1>Pestañas Fáciles con Javascript</h1>
	
	<div class="t-container" id="t-principal">
		<h2>Crea pestañas de manera fácil con Javascript</h2>
        
		<ul class="t-tabs">
            <li class="t-tab">Como funciona</li>
            <li class="t-tab">HTML</li>
            <li class="t-tab">Javascript</li>
            <li class="t-tab">CSS</li>
            <li class="t-tab" id="c-multiple">Grupos</li>
        </ul>
        <ul class="t-contents">
			<li class="t-content">
				<h3>Estructura HTML</h3>
				<ul>
					<li>Solo hay que copiar la estructura HTML predefinida con las correspondientes clases.</li>
					<li>Añade o elimina elementos <code>li</code> de ambas listas, cada par representa una pestaña con su contenido.</li>
				</ul>
				<h3>Función Javascript</h3>
				<ul>	
					<li>La función busca los elementos <code>li</code> de cada grupo y les asigna un atributo <code>index</code> con un número a cada uno.</li>
					<li>Después oculta o muestra las pestañas y sus elementos de contenido relacionándolos por el atributo <code>index</code> .</li>
				</ul>
				<h3>Estilos CSS</h3>
				<ul>	
					<li>Los estilos CSS son muy básicos.</li>
					<li>Destacamos la pestaña seleccionada y con la propiedad <code>transition</code> mostramos los contenidos de cada pestaña.</li>
				</ul>
				<h3>Grupos de pestañas</h3>
				<ul>
					<li>Puedes mostrar múltiples grupos de pestañas en la misma página sin problema.</li>
					<li>Asegúrate de que el número de elementos <code>li</code> de ambas listas es el mismo dentro de cada grupo de pestañas.</li>
				</ul>
			</li>
			
			<li class="t-content">
				<h4>Estructura HTML </h4>
				<ul>
					<li>Para crear un grupo de pestañas añade la siguiente estructura HTML con las correspondientes clases.</li>
					<li>Añade o elimina elementos <code>li</code> de ambas listas, cada par representa una pestaña con su contenido.</li>
					<li>Asegurate de que los pares de elementos <code>li</code> de cada grupo de pestañas son los mismos.</li>
				</ul>
				<code class="code-block">
				<pre>&lt;div class="t-container"&gt;
  &lt;ul class="t-tabs"&gt;  
    &lt;li class="t-tab"&gt;Uno&lt;/li&gt;  
    &lt;li class="t-tab"&gt;Dos&lt;/li&gt; 
    &lt;li class="t-tab"&gt;Tres&lt;/li&gt;  
  &lt;/ul&gt;
  &lt;ul class="t-contents"&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido Uno&lt;/p&gt;&lt;/li&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido Dos&lt;/p&gt;&lt;/li&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido Tres&lt;/p&gt;&lt;/li&gt;
  &lt;/ul&gt;
&lt;/div&gt;</pre>
				</code>
				<p></p>
			</li>

			<li class="t-content">
				<h4>Función Javascript</h4>
				<ul>
					<li>La función <code>easyTabs()</code> hace el resto...</li>
					<li>Se buscan los pares de elementos <code>li</code> de cada grupo y se les asigna el atributo <code>index</code> con un número a cada uno.</li>
					<li>Se ocultan o muestran las pestañas y sus elementos de contenido relacionándolos por el valor del atributo <code>index</code> .</li>
				</ul>
				<code class="code-block">
				<pre>function easyTabs() {
  var groups = document.querySelectorAll('.t-container');
  if (groups.length &gt; 0) {
    for (i = 0; i &lt; groups.length; i++) {
      var tabs = groups[i].querySelectorAll('.t-tab');
      for (t = 0; t &lt; tabs.length; t++) {
        tabs[t].setAttribute("index", t+1);
        if (t == 0) tabs[t].className = "t-tab selected";
      }
      var contents = groups[i].querySelectorAll('.t-content');
      for (c = 0; c &lt; contents.length; c++) {
        contents[c].setAttribute("index", c+1);
        if (c == 0) contents[c].className = "t-content selected";
      }
    }
    var clicks = document.querySelectorAll('.t-tab');
    for (i = 0; i &lt; clicks.length; i++) {
      clicks[i].onclick = function() {
        var tSiblings = this.parentElement.children;
        for (i = 0; i &lt; tSiblings.length; i++) {
          tSiblings[i].className = "t-tab";
        }
        this.className = "t-tab selected";
        var idx = this.getAttribute("index");
        var cSiblings = this.parentElement.parentElement.querySelectorAll('.t-content');
        for (i = 0; i &lt; cSiblings.length; i++) {
          cSiblings[i].className = "t-content";
          if (cSiblings[i].getAttribute("index") == idx) {
            cSiblings[i].className = "t-content selected";
          }
        }
      };
    }
  }
}</pre>
				</code>
				<p><br></p>
				<ul>
					<li>Hay que llamar a la función <code>easyTabs()</code> cuando el HTML del documento esté cargado.</li>
					<li>De esta manera se detectan y se organizan todos los grupos de pestañas existentes.</li>
				</ul>
				<code class="code-block">
				<pre>(function() { 
  easyTabs();
})();</pre>
				</code>
				<p></p>
			</li>
			
			<li class="t-content">
				<h4>Estilos CSS </h4>
				<ul>
					<li>Los estilos CSS, aparte del diseño de las pestañas, son muy básicos.</li>
					<li>Destacamos la pestaña seleccionada.</li>
					<li>Aplicando la propiedad <code>transition</code> mostramos el contenido de la pestaña seleccionada.</li>
				</ul>
				<code class="code-block">
				<pre>.t-container {
  margin: 0 auto;
  padding: 0 2em;
}
.t-tabs, .t-contents {
  list-style-type: none;
  margin: 0;
  padding: 0 2% 0 2%;
  box-sizing: border-box;
}
.t-tabs li {
  color: #dedede;
  padding: 0.5em 0.7em;
  text-decoration: none;
  float: left;
  text-align: center;
  font-size: 1.1em;
  background: #717171;
  border-bottom: 0;
  min-width: 40px;
  margin-right: 2px;
  margin-bottom: 0 !important;
  box-sizing: border-box;
  cursor: pointer;
}
.t-tabs li:hover {
  background-color: #545454;
  color: #d2d2d2;
}
.t-tabs li.selected {
  color: #458ace;
  cursor: default;
  background: #333;
}
.t-contents {
  padding: 0 !important
}
.t-content {
  padding: 0 1em;
  background-color: #333;
  box-sizing: border-box;
  float: left;
  width: 100%;
  color: #b7b7b7;
  line-height: 1.3em;
  text-align: justify;
  z-index: 1;
  position: relative;
  max-height: 0;
  transition: max-height 0.5s ease 0s;
  overflow: hidden;
}
.t-content.selected {
  max-height: 3000px;
  transition: max-height 1.25s ease 0.5s;
}</pre>
				</code>
				<p></p>
			</li>
			
			<li class="t-content">
				<h4>Grupos de pestañas</h4>
				<ul>
					<li>Puedes mostrar múltiples grupos de pestañas en la misma página sin problema.</li>
					<li>Asegúrate de que el número de elementos <code>li</code> de ambas listas es el mismo dentro de cada grupo de pestañas.</li>
					<li>No se puede anidar un grupo de pestañas dentro de otro grupo de pestañas, se crean conflictos con los atributos <code>index</code> .</li>
				</ul>
				<code class="code-block">
				<pre>&lt;div class="t-container"&gt;
  &lt;ul class="t-tabs"&gt;  
    &lt;li class="t-tab"&gt;Uno&lt;/li&gt;  
    &lt;li class="t-tab"&gt;Dos&lt;/li&gt; 
    &lt;li class="t-tab"&gt;Tres&lt;/li&gt;  
  &lt;/ul&gt;
  &lt;ul class="t-contents"&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido Uno&lt;/p&gt;&lt;/li&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido Dos&lt;/p&gt;&lt;/li&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido Tres&lt;/p&gt;&lt;/li&gt;
  &lt;/ul&gt;
&lt;/div&gt;

&lt;div class="t-container"&gt;
  &lt;ul class="t-tabs"&gt;  
    &lt;li class="t-tab"&gt;1&lt;/li&gt;  
    &lt;li class="t-tab"&gt;2&lt;/li&gt; 
    &lt;li class="t-tab"&gt;3&lt;/li&gt;  
    &lt;li class="t-tab"&gt;4&lt;/li&gt;  
  &lt;/ul&gt;
  &lt;ul class="t-contents"&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido 1&lt;br&gt;1111111111&lt;/p&gt;&lt;/li&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido 2&lt;br&gt;2222222222&lt;/p&gt;&lt;/li&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido 3&lt;br&gt;3333333333&lt;/p&gt;&lt;/li&gt;
    &lt;li class="t-content"&gt;&lt;p&gt;Contenido 4&lt;br&gt;4444444444&lt;/p&gt;&lt;/li&gt;
  &lt;/ul&gt;
&lt;/div&gt;</pre>
				</code>
				<p></p>
				
			</li>
        
		</ul>
		<!--<div class="separator"></div>-->
	
    </div><!-- .t-container -->
	<div class="t-arrow"></div>

	
	
	<div class="t-container">
	   <ul class="t-tabs">  
		 <li class="t-tab">Uno</li>  
		 <li class="t-tab">Dos</li> 
		 <li class="t-tab">Tres</li>  
	   </ul>
	   <ul class="t-contents">
	     <li class="t-content"><p>Contenido Uno</p></li>
	     <li class="t-content"><p>Contenido Dos</p></li>
	     <li class="t-content"><p>Contenido Tres</p></li>	   
       </ul>
	   <div class="separator"></div>
	</div>
	
	
	
	<div class="t-container" id="t-multiple">
	   <ul class="t-tabs">  
		 <li class="t-tab">1</li>  
		 <li class="t-tab">2</li> 
		 <li class="t-tab">3</li>  
		 <li class="t-tab">4</li>  
	   </ul>
	   <ul class="t-contents">
	     <li class="t-content"><p>Contenido 1<br>11111111111</p></li>
	     <li class="t-content"><p>Contenido 2<br>2222222222</p></li>
	     <li class="t-content"><p>Contenido 3<br>3333333333</p></li>	
	     <li class="t-content"><p>Contenido 4<br>4444444444</p></li>	   
       </ul>
	   <div class="separator"></div>
	</div>
!

CSS 

              
                body {
	color: #333;
	font-family: Arial, Helvetica, Sans-serif;
	font-weight: normal;
	margin: 0;
	padding: 0;
	background: url(http://josetxu.com/img/fondo_blanco.png) repeat 0 0 #fff;
}
h1 {
	background: #333;
	font-family: Arial, Helvetica, serif;
	color: #fff;
	text-align: center;
	padding: 0.5em;
	margin: 0 0 1em 0;
}
h2 {
	font-weight: normal;
	font-family: Arial, Helvetica, serif;
	color: #458ace;
	text-align: center;
	margin-bottom: 1em;
}
h3 {
	font-weight: normal;
	color: #458ace;
}
h4 {
	font-weight: normal;
	color: #717171;
	font-size: 1.2em;
	margin-top: 1em;
	margin-bottom: 1em;
}
.t-container {
	margin: 0 auto;
	padding: 0 2em;
}
.t-tabs, .t-contents {
	list-style-type: none;
	margin: 0;
	padding: 0 2% 0 2%;
	box-sizing: border-box;
}
.t-tabs li {
	color: #dedede;
	padding: 0.5em 0.7em;
	text-decoration: none;
	float: left;
	text-align: center;
	font-size: 1.1em;
	background: #717171;
	border-bottom: 0;
	min-width: 40px;
	margin-right: 2px;
	margin-bottom: 0 !important;
	box-sizing: border-box;
	cursor: pointer;
}
.t-tabs li:hover {
	background-color: #545454;
	color: #d2d2d2;
}
.t-tabs li.selected {
	color: #458ace;
	cursor: default;
	background: #333;
}
.t-contents {
	padding:0 !important
}
.t-content {
	padding: 0 1em;
	background-color: #333;
	box-sizing: border-box;
	float: left;
	width: 100%;
	color: #b7b7b7;
	line-height: 1.3em;
	text-align: justify;
	z-index: 1;
	position: relative;
	max-height: 0;
	transition: max-height 0.5s ease 0s;
	overflow: hidden;
}
.t-content.selected {
	max-height: 3000px;
	transition: max-height 1.25s ease 0.5s;
}
.t-content ul {
	padding-left: 1.4em;
	margin-bottom: 1.75em;
}
.t-content ul li {
	margin-bottom: 0.5em;
}
.t-content ul li:before {
	content: "●";
	float: left;
	margin-left: -19px;
	color: #3c7ab7;
	z-index: 2;
	position: relative;
}

code {
	background: #1f1f1f70;
	padding: 0.01em 0.4em;
	border-radius: 2px;
	color: #4388cc;
	font-size: 1.2em;
	border: 1px solid #292929;
}
code.code-block {
	width: 100%;
	box-sizing: border-box;
	display: inline-block;
	margin-left: 4px;
	border-left: 8px solid #3c7ab7;
	font-size: 0.9em;
	padding-left: 0.75em;
}
code.code-block span {
	color: #717171;
}
.separator {
	width: 100%;
	float: left;
	height: 0;
	margin: 3em 0;
}
.t-arrow {
    padding: 0 5em;
    display: table;
}
.t-arrow:before {
	content: "";
    border: 2em solid transparent;
    float: left;
    z-index: 222;
    border-top: 2em solid #333;
    bottom: 0;
    display: block;
}
#t-multiple {
	display: none;
}
#t-multiple.showit {
	display: block !important;
}
!

JS 

              
                function easyTabs() {
	
		var groups = document.querySelectorAll('.t-container');
		
		//if t-container
		if (groups.length > 0) {
	
			for(i = 0; i < groups.length; i++){
				//tabs
				var tabs = groups[i].querySelectorAll('.t-tab');
				for(t = 0; t < tabs.length; t++){
					tabs[t].setAttribute("index", t+1);
					if(t==0)tabs[t].className="t-tab selected";
				}
				//contents
				var contents = groups[i].querySelectorAll('.t-content');
				for(c = 0; c < contents.length; c++){
					contents[c].setAttribute("index", c+1);
					if(c==0)contents[c].className="t-content selected";
				}
				if(tabs.length!=contents.length) alert('ERROR: \r\nEl número de elementos <li> y <div> de algún grupo de pestañas creado no es el correcto. Por favor, revísalo para corregir el error.');
			}
			
			//clicks
			var clicks = document.querySelectorAll('.t-tab');
			for(i = 0; i < clicks.length; i++){
				clicks[i].onclick = function() {
					//remove tab selected classes
					var tSiblings = this.parentElement.children;
					for(i = 0; i < tSiblings.length; i++){
						tSiblings[i].className="t-tab";
					}
					//add tab selected class
					this.className="t-tab selected";
					var idx = this.getAttribute("index"); 
					if(idx==5)document.getElementById('t-multiple').className='t-container showit';
					else 
						if(this.parentElement.parentElement.getAttribute('id')=='t-principal')document.getElementById('t-multiple').className='t-container';
					// selected content
					var cSiblings = this.parentElement.parentElement.querySelectorAll('.t-content');
					for(i = 0; i < cSiblings.length; i++){
						//remove content selected classes
						cSiblings[i].className="t-content";
						//add content selected classes					
						if(cSiblings[i].getAttribute("index")==idx){
							cSiblings[i].className="t-content selected";
						}
					}					
				};
			}
		
		}
	}

	(function() { 
		easyTabs() ;
	})();
!
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