{"id":10498,"date":"2020-09-02T16:39:26","date_gmt":"2020-09-02T14:39:26","guid":{"rendered":"https:\/\/www.espai.es\/blog\/?p=10498"},"modified":"2021-09-13T19:19:29","modified_gmt":"2021-09-13T17:19:29","slug":"personalizar-el-aspecto-del-elemento-input-de-tipo-file","status":"publish","type":"post","link":"https:\/\/www.espai.es\/blog\/2020\/09\/personalizar-el-aspecto-del-elemento-input-de-tipo-file\/","title":{"rendered":"Personalizar el aspecto del elemento input de tipo file"},"content":{"rendered":"

Uno de los problemas con el elemento de formulario input<\/strong> <\/em>de tipo file<\/em><\/strong><\/a>, es que en cada navegador se muestra de forma diferente, y que darle aspecto con CSS no resulta f\u00e1cil.<\/p>\n

En el siguiente art\u00edculo veremos como darle el aspecto que queramos mediante un truco con el CSS position<\/em><\/strong>.<\/p>\n

Para ello, lo primero que vamos a necesitar es colocar nuestro input<\/strong> <\/em>de tipo file dentro de un elemento div<\/em><\/strong>. Para que todo quede lo m\u00e1s claro posible, vamos a modificar el aspecto de dos elementos input<\/strong> <\/em>a la vez.<\/p>\n

<div class=\"file-select\" id=\"src-file1\" >\r\n  <input type=\"file\" name=\"src-file1\" aria-label=\"Archivo\">\r\n<\/div>\r\n\r\n<div class=\"file-select\" id=\"src-file2\" >\r\n  <input type=\"file\" name=\"src-file2\" aria-label=\"Archivo\">\r\n<\/div>\r\n<\/pre>\n
 <\/p>\n
Despu\u00e9s, vamos a aplicar el siguiente c\u00f3digo CSS<\/p>\n
.file-select {\r\n  position: relative;\r\n  display: inline-block;\r\n}\r\n\r\n.file-select::before {\r\n  background-color: #5678EF;\r\n  color: white;\r\n  display: flex;\r\n  justify-content: center;\r\n  align-items: center;\r\n  border-radius: 3px;\r\n  content: 'Seleccionar'; \/* testo por defecto *\/\r\n  position: absolute;\r\n  left: 0;\r\n  right: 0;\r\n  top: 0;\r\n  bottom: 0;\r\n}\r\n\r\n.file-select input[type=\"file\"] {\r\n  opacity: 0;\r\n  width: 200px;\r\n  height: 32px;\r\n  display: inline-block;\r\n}\r\n\r\n#src-file1::before {\r\n  content: 'Seleccionar Archivo 1';\r\n}\r\n\r\n#src-file2::before {\r\n  content: 'Seleccionar Archivo 2';\r\n}\r\n<\/pre>\n
 <\/p>\n
El resultado es el siguiente.<\/p>\n
\"Input<\/a>
Un par de input de tipo file personalizados con aspecto de bot\u00f3n.<\/p><\/div>\n
Y ahora viene la explicaci\u00f3n.<\/p>\n
Lo que realmente estamos haciendo, no es darle aspecto al elemento input<\/em><\/strong>. En realidad estamos d\u00e1ndole aspecto a un elemento que se encuentra justo encima, tapando el input<\/strong><\/em>. Para ello hemos usado position: absolute;\u00a0<\/em><\/strong>El elemento que estamos colocando encima del input<\/strong><\/em> en realidad no existe en el c\u00f3digo HTML. Este elemento lo estamos creando mediante CSS con el pseudoselector ::before<\/strong><\/em>.<\/p>\n
Este pseudoselector nos permite a\u00f1adir un hijo al principio del elemento en cuesti\u00f3n (en nuestro ejemplo, al principio de cada div<\/strong><\/em> de la clase file-select<\/em><\/strong>). Es como si dentro de esos elementos div<\/strong><\/em> tuvi\u00e9ramos un elemento span<\/strong> <\/em>con el texto que indicamos en la propiedad CSS content<\/strong> dentro de dicho span<\/em><\/strong>\u00a0imaginario. Obviamente, nada nos impide usar elementos span<\/strong><\/em> en lugar del pseudoselector ::before<\/strong><\/em>.<\/p>\n
Ese span<\/strong> <\/em>imaginario, lo colocamos encima del input<\/strong> <\/em>gracias al position: absolute;<\/strong> <\/em>Por eso en el div<\/strong> <\/em>tenemos el correspondiente position: relative;<\/strong> <\/em>necesario para poder usar el position: absolute;<\/strong> <\/em>correctamente.<\/p>\n
Finalmente, para asegurarnos de que el input<\/strong> <\/em>no molesta, le ponemos un opacity: 0;<\/strong><\/em> para volverlo totalmente transparente.<\/p>\n
Y ya est\u00e1. Con este sencillo ejemplo hemos visto como darle un aspecto de bot\u00f3n uniforme entre diferentes navegadores a un elemento input<\/strong> <\/em>de tipo file<\/em><\/strong>. Espero que os haya resultado interesante y nos vemos en el pr\u00f3ximo art\u00edculo.<\/p>\n","protected":false},"excerpt":{"rendered":"
En este art\u00edculo veremos como darle el aspecto que queramos al elemento de formulario input de tipo file, mediante un truco con el CSS position.<\/p>\n","protected":false},"author":23,"featured_media":10507,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_ef_editorial_meta_date_first-draft-date":"","_ef_editorial_meta_paragraph_assignment":"","_ef_editorial_meta_checkbox_needs-photo":"","_ef_editorial_meta_number_word-count":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[12],"class_list":["post-10498","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diseno-web","tag-css"],"yoast_head":"\nPersonalizar el aspecto del elemento input de tipo file - 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