{"id":8838,"date":"2012-01-30T07:36:19","date_gmt":"2012-01-30T06:36:19","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=8838"},"modified":"2023-02-27T14:46:48","modified_gmt":"2023-02-27T14:46:48","slug":"tooltip-e-css3-transition","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/marketing\/tooltip-e-css3-transition\/","title":{"rendered":"Tooltip e CSS3 Transition"},"content":{"rendered":"

Uno degli elementi pi\u00f9 interessanti nell’ambito del web design \u00e8 il Tooltip<\/strong>. Questo genere di elemento serve spesso a fornire informazioni per chiarire un tipo di funzionalit\u00e0<\/strong> o avvisare l’utente di una reazione legata ad una sua azione (di solito un click). Stando attenti a non abusarne, i tooltip (termine che letteralmente significa “consiglio su un oggetto”) sono utili perch\u00e8, essendo posizionati sopra ad altri blocchi gi\u00e0 occupati, sfruttano porzioni non previste dalla griglia della pagina web<\/strong>.<\/p>\n

Oggi, per creare questo tipo di elemento in un sito web \u00e8 possibile lavorare utilizzando solo CSS3<\/strong> e qualche accorgimento a livello di codice HTML<\/strong>. Javascript pu\u00f2 servire come strumento di fallback<\/strong> per offrire la piena compatibilit\u00e0 dello script con Internet explorer.<\/p>\n

La base HTML del tooltip<\/h2>\n

Per realizzare una struttura base dobbiamo pensare ad un elemento target che causi la comparsa del tooltip ed un blocco, affiancato o inserito in esso, che venga visualizzato. Nel nostro caso immaginiamo di dover creare un insieme di pulsanti affiancati in stile menu aventi ognuno il proprio tooltip.<\/p>\n

[html]
\n<ul>
\n\t<li>
\n\t\t<button class="button">pulsante 1<\/button>
\n\t\t<div class="bubble-wrapper">
\n\t\t\t<div class="bubble">
\n\t\t\t\t<div class="content">Lorem ipsum dolor sit amet, consectetur adipisicing elit…<\/div>
\n\t\t\t<\/div>
\n\t\t<\/div>
\n\t<\/li>
\n\t<li>…<\/li>
\n<\/ul>
\n[\/html]<\/p>\n

Abbiamo creato una lista e posizionato in ogni elemento un tag button<\/em> affiancato ad un div.bubble-wrapper<\/em>. Il nostro codice CSS<\/strong> andra a visualizzare il div.bubble-wrapper<\/em> nel momento in cui l’utente effettui l’hover sul button che lo precede.
\nAbbiamo deciso di utilizzare 3 div per ogni tooltip<\/strong> per poter gestire una transizione di appear particolare: oltre che comparire con modifica di opacity, il nostro tooltip deve aumentare le proprie dimensioni partendo da 0px<\/em> per arrivare a larghezza e altezza definitive.<\/p>\n

\"\"
\nQuesto pu\u00f2 essere realizzato con la propriet\u00e0 CSS overflow: hidden;<\/em> impostata su un wrapper per il quale vengano modificate width e height con transizione che parta da 0<\/em>.<\/p>\n

Le principali propriet\u00e0 CSS<\/h2>\n

Abbiamo detto che il div.bubble-wrapper \u00e8 il contenitore del nostro tooltip:<\/p>\n

[css]
\n.bubble-wrapper{
\n width:0;
\n height:0;
\n overflow:hidden;
\n opacity:0;
\n …
\n -webkit-transition:width .7s, opacity .7s, height 1.5s;
\n -moz-transition:width .7s, opacity .7s, height 1.5s;
\n -o-transition:width .7s, opacity .7s, height 1.5s;
\n transition:width .7s, opacity .7s, height 1.5s;
\n}
\n[\/css]<\/p>\n

In stato normale il tooltip non deve essere visualizzato, dunque abbiamo impostato come gi\u00e0 citato width<\/em>, height<\/em> e opacity<\/em> a 0 oltre che overflow:hidden<\/em>. Inoltre per utilizzare la transizione CSS abbiamo specificato la propriet\u00e0 transition<\/a> con i valori in secondi per la durata di trasformazione per ogni propriet\u00e0: width .7s, opacity .7s, height 1.5s<\/em>.<\/p>\n

Tralasciando tutte le regole dedicate unicamente alla realizzazione grafica del baloon<\/strong>, arriviamo direttamente a quella centrale che permette l’animazione e che quindi scatena l’azione:<\/p>\n

[css]
\n.button:hover + .bubble-wrapper{
\n width:320px;
\n height:120px;
\n opacity:1;
\n}
\n[\/css]<\/p>\n

All’azione di hover sul button, vengono impostate per l’elemento successivo, specificato con il selettore CSS “+”<\/strong>, avente class bubble-wrapper<\/em> i valori finali di width, height e opacity per la transizione definita poco sopra.<\/p>\n

Aggiungere la pipetta<\/h2>\n

Il triangolo che unisce il tooltip al suo elemento target \u00e8 denominato pipetta<\/a>. Un tooltip che non abbia tale elemento pu\u00f2 sembrare ambiguo o almeno posizionato in modo aleatorio. Dunque, per inserire la pipetta al nostro baloon possiamo evitare di inserire codice HTML superfluo (vedi span o div vuoti) per sfruttare il selettore CSS :after<\/em>.<\/p>\n

[css]
\n.bubble > .content:after {
\n width:10px;
\n height:10px;
\n display:block;
\n background-image: -webkit-linear-gradient(left bottom, #ffffff 0, #ffffff 50%, rgba(0,0,0,0) 51%, rgba(0,0,0,0) 100%);
\n background-image: -moz-linear-gradient(left bottom, #ffffff 0, #ffffff 50%, rgba(0,0,0,0) 51%, rgba(0,0,0,0) 100%);
\n background-image: -o-linear-gradient(left bottom, #ffffff 0, #ffffff 50%, rgba(0,0,0,0) 51%, rgba(0,0,0,0) 100%);
\n background-image: linear-gradient(left bottom, #ffffff 0, #ffffff 50%, rgba(0,0,0,0) 51%, rgba(0,0,0,0) 100%);
\n content:’.’;
\n text-indent:999px;
\n overflow:hidden;
\n position:absolute;
\n top:0px;
\n left:15px;
\n box-shadow:-1px -1px 3px rgba(0,0,0,.3);
\n}
\n[\/css]<\/p>\n

Tramite questa propriet\u00e0 il browser aggiunge, dopo il div.content<\/em> incluso nel tooltip, un elemento che non \u00e8 visibile direttamente nel codice della pagina perch\u00e8 specificato da CSS<\/strong>. La visualizzazione del triangolo \u00e8 permessa dal background-image definito come gradient per il quale, partendo dal pixel in basso a sinistra sviluppa per il primo 50% del quadrato, con direzione a 45\u00b0, un gradiente che va da #ffffff ad #ffffff, quindi del tutto bianco e per il 50% restante rimane trasparente.<\/p>\n

Il tooltip completo<\/h2>\n

A questa pagina<\/a> si pu\u00f2 visualizzare il tooltip realizzato con solo HTML e CSS ed analizzarne il codice.<\/p>\n

A livello di visualizzazione cross-browser<\/strong> ho voluto semplicemente rendere compatibile il tooltip solo con i browser aggiornati<\/strong> a livello di web standard<\/a>. Per quanto concerne la graceful degradation<\/em> il baloon \u00e8 comunque visualizzato anche in IE, senza, per\u00f2, transizioni e pipetta.<\/p>\n","protected":false},"excerpt":{"rendered":"

Uno degli elementi pi\u00f9 interessanti nell\u2019ambito del web design \u00e8 il tooltip<\/strong>. Questo genere di elemento serve spesso a fornire informazioni per chiarire un tipo di funzionalit\u00e0 o avvisare l\u2019utente di una reazione legata ad una sua azione (di solito un click).<\/p>\n","protected":false},"author":4,"featured_media":18389,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[300],"tags":[69,163,254,158],"class_list":["post-8838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-marketing","tag-css3","tag-gradient","tag-tooltip","tag-transition"],"yoast_head":"\n\u2022 Tooltip e CSS3 Transition - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Tooltip e CSS3 Transition. Contattaci per una partnership! 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In addition to my commitment to the business world, I am an active researcher in the field of new technologies, always fascinated by cutting-edge innovations in the industry.","sameAs":["https:\/\/www.linkedin.com\/in\/sergioravera\/"],"url":"https:\/\/www.artera.net\/it\/author\/sergio-ravera\/"}]}},"_links":{"self":[{"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/posts\/8838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/comments?post=8838"}],"version-history":[{"count":1,"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/posts\/8838\/revisions"}],"predecessor-version":[{"id":216758,"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/posts\/8838\/revisions\/216758"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/media\/18389"}],"wp:attachment":[{"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/media?parent=8838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/categories?post=8838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.artera.net\/it\/wp-json\/wp\/v2\/tags?post=8838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}