Menù per condividere sui social realizzato solo con i CSS.

Come creare un menù per condividere le pagine web su Facebook, Twitter, Google+ e visualizzare i Feed RSS solo con CSS3 senza immagini o javascript.

La condivisione degli articoli del blog sui social network è una priorità per tutti gli webmaster così come lo è il favorire la stessa condivisione da parte dei lettori più o meno abituali. Per questo compito vengono usati i bottoni ufficiali di condivisione di Google+, Facebook e Twitter, delle icone fai da te oppure altri sistemi operando direttamente nel template.

Ciascuno di questi metodi provoca un aumento del tempo di caricamento della pagina vuoi per caricare i javascript dei social network vuoi per gli indirizzi delle immagini delle icone. In questo post propongo una soluzione che ci permette di installare nella sidebar, nel footer o altrove un menù in cui selezionare il social network in cui condividere la pagina senza javascript e senza utilizzare un hosting per le icone. Le immagini infatti sono realizzate con base64 e sono costituite solo da codice. Il codice di questo interessante gadget è stato messo a punto dal blog indonesiano WP Theme Generator che si occupa essenzialmente di Wordpress. Si può consultare la pagina originale su JsFiddle. Questo widget può però essere installato in qualsiasi pagina web visto che non ha tag specifici di una singola piattaforma.

Oltre ai social media per antonomasia Twitter, Facebook e Google+ è presente anche il collegamento per aprire i feed del sito. Su Wordpress si trascina il widget Testo per poi incollarci il codice mentre su Blogger si va su Layout > Aggiungi un gadget > HTML/Javascript e si incolla questo codice

<style>
.glossy-selectbox {
  display:inline-block;
  font:normal bold 12px Arial,Sans-Serif;
  position:relative;
  width:300px;
  background-color:#111;
  text-align:left;
  background-image:-webkit-linear-gradient(top,rgba(255,255,255,.4) 0%,rgba(255,255,255,.2) 50%,rgba(255,255,255,0) 50%,rgba(255,255,255,.1) 100%);
  background-image:-moz-linear-gradient(top,rgba(255,255,255,.4) 0%,rgba(255,255,255,.2) 50%,rgba(255,255,255,0) 50%,rgba(255,255,255,.1) 100%);
  background-image:-ms-linear-gradient(top,rgba(255,255,255,.4) 0%,rgba(255,255,255,.2) 50%,rgba(255,255,255,0) 50%,rgba(255,255,255,.1) 100%);
  background-image:-o-linear-gradient(top,rgba(255,255,255,.4) 0%,rgba(255,255,255,.2) 50%,rgba(255,255,255,0) 50%,rgba(255,255,255,.1) 100%);
  background-image:linear-gradient(top,rgba(255,255,255,.4) 0%,rgba(255,255,255,.2) 50%,rgba(255,255,255,0) 50%,rgba(255,255,255,.1) 100%);
filter:progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr='#333333',endColorstr='#111111');
  -webkit-border-radius:7px;
  -moz-border-radius:7px;
  border-radius:7px;
  -webkit-box-shadow:inset 0 1px 1px 1px rgba(255,255,255,.1), 0 1px 3px rgba(0,0,0,.7);
  -moz-box-shadow:inset 0 1px 1px 1px rgba(255,255,255,.1), 0 1px 3px rgba(0,0,0,.7);
  box-shadow:inset 0 1px 1px 1px rgba(255,255,255,.1), 0 1px 3px rgba(0,0,0,.7);
}
.glossy-selectbox:before,
.glossy-selectbox:after {
  content:"";
  display:block;
  width:0;
  height:0;
  border:3px solid transparent;
  border-width:5px 3px;
  border-bottom-color:#999;
  position:absolute;
  top:25%;
  right:5px;
  z-index:4;
}
.glossy-selectbox:after {
  border-color:#999 transparent transparent;
  top:auto;
  bottom:25%;
}
.glossy-selectbox input {
  display:block;
  position:absolute;
  top:0;
  right:0;
  bottom:0;
  width:15px;
  height:100%;
  opacity:0;
  z-index:10;
  cursor:pointer;
}
.glossy-selectbox label {
  display:block;
  line-height:45px;
  color:rgba(255,255,255,.5);
  padding:0 15px;
  -webkit-transition:all 0s ease-out;
  -moz-transition:all 0s ease-out;
  -ms-transition:all 0s ease-out;
  -o-transition:all 0s ease-out;
  transition:all 0s ease-out;
}
.glossy-selectbox label:before {
  content:attr(data-default);
}
.glossy-selectbox label:after {
  content:"";
  display:block;
  position:absolute;
  top:0;
  right:0;
  bottom:0;
  width:15px;
  border-left:1px solid rgba(0,0,0,.4);
  -webkit-border-radius:0 7px 7px 0;
  -moz-border-radius:0 7px 7px 0;
  border-radius:0 7px 7px 0;
  -webkit-box-shadow:inset 1px 0 0 rgba(255,255,255,.1),-1px 0 0 rgba(255,255,255,.1);
  -moz-box-shadow:inset 1px 0 0 rgba(255,255,255,.1),-1px 0 0 rgba(255,255,255,.1);
  box-shadow:inset 1px 0 0 rgba(255,255,255,.1),-1px 0 0 rgba(255,255,255,.1);
}
.glossy-selectbox input:hover + label {
  color:white;
}
.glossy-selectbox input:hover + label:after {
  background-color:rgba(255,255,255,.04);
}
.glossy-selectbox ul {
  margin:0 0;
  padding:0 0;
  position:absolute;
  top:100%;
  left:14px;
  right:14px;
  background-color:#222;
  border:1px solid #111;
  -webkit-box-shadow:0 1px 2px rgba(0,0,0,.4),0 5px 7px -2px rgba(0,0,0,.4);
  -moz-box-shadow:0 1px 2px rgba(0,0,0,.4),0 5px 7px -2px rgba(0,0,0,.4);
  box-shadow:0 1px 2px rgba(0,0,0,.4),0 5px 7px -2px rgba(0,0,0,.4);
  visibility:hidden;
  opacity:0;
  z-index:99;
}
.glossy-selectbox li {
  margin:0 0;
  padding:0 0;
  list-style:none;
  float:left;
  width:50%;
  display:inline;
}
.glossy-selectbox a {
  display:block;
  position:relative;
  color:#999;
  text-decoration:none;
  text-shadow:0 0 2px black;
  line-height:30px;
  border-top:1px solid #111;
  border-right:1px solid #111;
  padding:0 15px 0 32px;
  -webkit-box-shadow:inset 0 0 0 1px #333;
  -moz-box-shadow:inset 0 0 0 1px #333;
  box-shadow:inset 0 0 0 1px #333; 
  -webkit-border-radius:1px;
  -moz-border-radius:1px;
  border-radius:1px;
}
.glossy-selectbox a:nth-child(even) {
  border-right-width:0;
}
.glossy-selectbox a:before {
  content:"";
  display:block;
  width:16px;
  height:16px;
  position:absolute;
  top:7px;
  left:7px;
  background-color:transparent;
  background-repeat:no-repeat;
  background-position:50% 0;
}
.glossy-selectbox a:hover:before {
  background-position:50% 100%;
}
.glossy-selectbox .social-rss:before      {background-image:url('data:image/png;base64,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')}
.glossy-selectbox .social-facebook:before {background-image:url('data:image/png;base64,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')}
.glossy-selectbox .social-twitter:before  {background-image:url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAgCAYAAAAbifjMAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA2RpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMC1jMDYwIDYxLjEzNDc3NywgMjAxMC8wMi8xMi0xNzozMjowMCAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDo5MTEwQTQ2RjY1RkVFMDExODA0OEVBREIxOUJCOTU1MCIgeG1wTU06RG9jdW1lbnRJRD0ieG1wLmRpZDozQjM1NzQwMDAzMUUxMUUxQThDN0E3RjZBMzJBQUI2NiIgeG1wTU06SW5zdGFuY2VJRD0ieG1wLmlpZDozQjM1NzNGRjAzMUUxMUUxQThDN0E3RjZBMzJBQUI2NiIgeG1wOkNyZWF0b3JUb29sPSJBZG9iZSBQaG90b3Nob3AgQ1M1IFdpbmRvd3MiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDpCNTQ1NjQ2NjBCMDNFMTExOEFFNUMxQUI0QURFQTMyOCIgc3RSZWY6ZG9jdW1lbnRJRD0ieG1wLmRpZDo5MTEwQTQ2RjY1RkVFMDExODA0OEVBREIxOUJCOTU1MCIvPiA8L3JkZjpEZXNjcmlwdGlvbj4gPC9yZGY6UkRGPiA8L3g6eG1wbWV0YT4gPD94cGFja2V0IGVuZD0iciI/Psm+fpUAAAClSURBVHjaYvz//z8DJYAFxkhLS7MHUl1QbhkQH8SladasWZgGAMEKIJZAYksS4wImJLYEDjbRBpAF8BnwHws+CcT2lLjADBo+FHnhLyUGvADiFKzpAAtgHPBYINmAj5RG4z5Ko7EGiN+RHY3V1dXXgJQeEK+BRhdR0cgIKw8ePnxIdMDJy8tj9YI9NJAwAoqoAmW0PBgtD0bLAyqVB0BAVnkAEGAAd3tFMviqyf8AAAAASUVORK5CYII=')}
.glossy-selectbox .social-google:before   {background-image:url('data:image/png;base64,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')}
.glossy-selectbox a:hover {
  background-color:rgba(0,0,0,.2);
  color:#ccc;
}
.glossy-selectbox input:checked + label {
  color:rgba(255,255,255,.4);
  -webkit-transition-duration:.4s;
  -moz-transition-duration:.4s;
  -ms-transition-duration:.4s;
  -o-transition-duration:.4s;
  transition-duration:.4s;
}
.glossy-selectbox input:checked + label:before {
  content:attr(data-focus);
}
.glossy-selectbox input:checked + label:after {
  background-color:rgba(0,0,0,.2);
  -webkit-box-shadow:inset 1px 0 1px rgba(0,0,0,.4),-1px 0 0 rgba(255,255,255,.1);
  -moz-box-shadow:inset 1px 0 1px rgba(0,0,0,.4),-1px 0 0 rgba(255,255,255,.1);
  box-shadow:inset 1px 0 1px rgba(0,0,0,.4),-1px 0 0 rgba(255,255,255,.1);
}
.glossy-selectbox input:checked ~ ul {
  visibility:visible;
  opacity:1;
}
</style>
<div align="center">
<div class="glossy-selectbox">
    <input type="checkbox">
    <label data-default="Condividi questo articolo!" data-focus="Seleziona uno dei social network..."></label>
    <ul>
        <li><a class="social-rss" href="http://feeds.feedburner.com/ideepercomputeredinternet/zUQN" target="_blank" rel="nofollow">RSS Feed</a></li>
        <li><a class="social-facebook" href="http://www.facebook.com/parsifal32" target="_blank" rel="nofollow">Facebook</a></li>
        <li><a class="social-twitter" href="http://twitter.com/parsifal32" target="_blank" rel="nofollow">Twitter</a></li>
        <li><a class="social-google" href="https://plus.google.com/111056841635962157738" target="_blank" rel="nofollow">Google+</a></li>
    </ul>
</div>
</div>

Si salva e si posiziona con il drag & drop del cursore. Per quello che riguarda l'aspetto ci sarebbero un sacco di cose da personalizzare ma mi sono limitato a indicare solo la larghezza del widget (300 pixel), la famiglia e la dimensione dei caratteri. Le immagini sono determinate da quegli URL lunghissimi in base64. Va editata la parte finale del codice in cui si possono modificare le espressioni colorate di blu e vanno cambiati gli URL dei feed e dei social network colorati di rosso.