menúes y la class .selected

15/Mar/2007 966

Por usabilidad, siempre es recomendable dejarle claro al usuario dónde está parado dentro del sitio. Existen varias maneras de hacerlo, desde dejar evidente en el <title> en qué sección se está, pasando por mostrar un pequeño mapa de navegación desde y hasta dónde está ubicado (Inicio > Quiénes Somos > Empleados por ejemplo) o dejar seleccionado en el menú de navegación dónde uno está parado, con una clase especial. En este caso, en sitios pequeños a medianos, recomiendo utilizar un pequeño y simple truco que involucra HTML y CSS.

Hagamos un layout muy simple. En este caso, un menú con listas y un contenido sólo para que no esté tan vacío (reciclaré el HTML de un post anterior):

<div id="menulateral">
          <li><a href="#" class="selected1">Item Uno</a></li>
          <li><a href="#" class="selected2">Item Dos</a></li>
          <li><a href="#" class="selected3">Item Tres</a></li>
<div id="contenido">
     <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec ut risus hendrerit sem adipisc………</p>

Como se dieron cuenta, cada ítem del menú tiene una class="selected" con diferencias numéricas consecutivas (este es mi criterio, utilicen el que más les convenga) . El truco está en darle al <body> un ID específico, en este caso será uno para cada sección de nuestro menú, en total 3. Con este ID, mediante CSS le daremos un estilo para cada class selected, así si nos encontramos ubicados por ejemplo en el HTML con el id="item2", gatillará que la class selected2 de ese ID será desplegada. ¿Se entendió? Mejor sigo con el código CSS para que quede más claro:

body#item1 a.selected1, body#item2 a.selected2, body#item3 a.selected3 {
     text-decoration: none;
     padding-left: 10px;

Entonces, nuevamente, tenemos 3 páginas HTML cada una con un ID diferente, de acuerdo con la sección en que estamos. Cada <a> del menú tiene una class diferente también, para poder diferenciarlas. La idea es con el CSS poder manejar el estilo para mostrar al usuario que estamos ubicados en esa parte del sitio sin tener que tocar el HTML, basta con dejar las classes siempre puestas, pero con diferentes ID’s en el < body>.

Ver HTML final (view source para más detalles)

Ver Hoja de Estilos Final


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