La cosa es que en el truquillo que vamos a utilizar, la sensación será la de ampliar una miniatura al pasar el puntero por encima de ella, pero realmente lo que haremos será "esconder" mediante propiedades CSS, la mayor parte de la imagen, de manera que la porción que se verá hará de miniatura. Posteriormente, mediante las propiedades delHOVER conseguiremos que la imagen vuelva a mostrarse completa.
Todo se basa en CSS por lo que crearemos una clase nueva (.miniatura), que luego aplicaremos a nuestras imágenes. La asociaremos al tag que forma los párrafos (P) para una mayor faciidad en su aplicación:
float:left;
margin:0;
background:#000000;
border:1px solid #000000;
padding:2px;
}
p.miniatura a {
display:block;
float:left;
width:100px; /* Tamaño miniatura */
height:100px;
line-height:100px;
overflow:hidden; /* La miniatura no sobrepasará los límites */
position:relative;
z-index:100; /* Valor inferior al que lleve el HOVER */
}
p.miniatura a img {
float:left;
position:absolute;
top:-50px; /* Desplazamiento sobre esquina superior izquierda */
left:-150px;
}
p.miniatura a:hover { /* Lo que ocurrirá al pasar el puntero */
overflow:visible; /* Se permite que la imagen rebase los límites */
z-index:200; /* Valor superior al que lleve el enlace */
border:0px;
}
p.miniatura a:hover img {
border:5px solid #000000;
background:#ffffff;
padding:2px;
/* La imagen grande se desplaza un poco para poder ver las miniaturas */
top:30px;
}
Una vez creado el estilo, ya lo podemos aplicar a cualquier imagen que insertemos en cualquier parte del blog. Necesitaremos asignarle un tag de párrafo con la claseminiatura y añadirle un enlace vacío. Si se desea, el enlace puede ser a una dirección.
Como veis, la imagen puede incluir unWIDTH para forzar su salida con determinado tamaño. Esto es útil si queremos aplicarlo a una especie de galería de imágenes y no queremos tener que editarlas previamente para hacerlas del mismo ancho.
El truco no funcionará si alguna capa contenedora superior tuviera una propiedadoverflow:hidden. En este caso, no lograríamos que se viera la imagen original y la única solución sería cambiarlo aoverflow:visible, aunque dependiendo de las plantillas, eso puede estropear otras cosas. Es cuestión de probar. En las plantillas Blogger, elcontent-wrapper suele tener este atributo.
Y esto lo hemos aprendido enCSS Globe, dónde podeis ver cómo hacer lo mismo mediante listas.
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