Menu a discesa

Esempio di menu a discesa

Con menu a discesa o menu a tendina in informatica si intende un tipo di menu che viene attivato cliccando su uno degli elementi della barra dei menu e consiste appunto di una tendina di elementi alternativi selezionabili.

I menu a discesa furono introdotti per la prima volta in un sistema operativo per personal computer da Apple nel 1984 con il primo computer Macintosh che sviluppò idee e dei progetti di Xerox. Oggi i menu a discesa sono uno dei principali elementi di ogni interfaccia grafica di tutti i sistemi operativi.

Esempio di menu a discesa nel web

Esempi di menu sul web
Esempi di menu sul web

HTML:

<div class="dropdown">
  <button class="dropbtn">menu a discesa</button>
  <div class="dropdown-content">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>

CSS:

.dropbtn {
  background-color: #ff00ff;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
}
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f2f2f2;
  min-width: 180px;
  box-shadow: 0px 7px 19px 0px rgba(0,0,0,0.3);
  z-index: 1;
}
.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}
.dropdown-content a:hover {background-color: #ccc;}
.dropdown:hover .dropdown-content {display: block;}
.dropdown:hover .dropbtn {background-color: #35e48;}

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