Les accordéons sont utiles lorsque vous souhaitez basculer entre masquer et afficher une grande quantité de contenu :
<button class="accordion">Section 1</button>
<div class="panel">
<p>Lorem ipsum...</p>
</div>
<button class="accordion">Section 2</button>
<div class="panel">
<p>Lorem ipsum...</p>
</div>
<button class="accordion">Section 3</button>
<div class="panel">
<p>Lorem ipsum...</p>
</div>
Stylisez l'accordéon :
/* Style the buttons that are used to open and close the accordion panel */
.accordion {
background-color: #eee;
color: #444;
cursor: pointer;
padding: 18px;
width: 100%;
text-align: left;
border: none;
outline: none;
transition: 0.4s;
}
/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active, .accordion:hover {
background-color: #ccc;
}
/* Style the accordion panel. Note: hidden by default */
.panel {
padding: 0 18px;
background-color: white;
display: none;
overflow: hidden;
}
var acc = document.getElementsByClassName("accordion");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].addEventListener("click", function() {
/* Toggle between adding and removing the "active" class,
to highlight the button that controls the panel */
this.classList.toggle("active");
/* Toggle between hiding and showing the active panel */
var panel = this.nextElementSibling;
if (panel.style.display === "block") {
panel.style.display = "none";
} else {
panel.style.display = "block";
}
});
}
Pour créer un accordéon animé, ajoutez max-height: 0, overflow: hiddenet a transitionpour la propriété max-height, à la panelclasse.
Ensuite, utilisez JavaScript pour faire glisser le contenu vers le bas en définissant un calcul max-height, en fonction de la hauteur du panneau sur différentes tailles d'écran :
<style>
.panel {
padding: 0 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
}
</style>
<script>
var acc = document.getElementsByClassName("accordion");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].addEventListener("click", function() {
this.classList.toggle("active");
var panel = this.nextElementSibling;
if (panel.style.maxHeight) {
panel.style.maxHeight = null;
} else {
panel.style.maxHeight = panel.scrollHeight + "px";
}
});
}
</script>
Ajoutez un symbole à chaque bouton pour indiquer si le contenu réductible est ouvert ou fermé :
.accordion:after {
content: '\02795'; /* Unicode character for "plus" sign (+) */
font-size: 13px;
color: #777;
float: right;
margin-left: 5px;
}
.active:after {
content: "\2796"; /* Unicode character for "minus" sign (-) */
}