Exemple 5
Voici le dernier exemple expliquant comment construire des widgets de formulaire personnalisés.
Changement d'état
Contenu HTML
html
<form class="no-widget">
<select name="myFruit">
<option>Cerise</option>
<option>Citron</option>
<option>Banane</option>
<option>Fraise</option>
<option>Pomme</option>
</select>
<div class="select" role="listbox">
<span class="value">Cerise</span>
<ul class="optList hidden" role="presentation">
<li class="option" role="option" aria-selected="true">Cerise</li>
<li class="option" role="option">Citron</li>
<li class="option" role="option">Banane</li>
<li class="option" role="option">Fraise</li>
<li class="option" role="option">Pomme</li>
</ul>
</div>
</form>
Contenu CSS
css
.widget select,
.no-widget .select {
position: absolute;
left: -5000em;
height: 0;
overflow: hidden;
}
/* --------------- */
/* Styles Requis */
/* --------------- */
.select {
position: relative;
display: inline-block;
}
.select.active,
.select:focus {
box-shadow: 0 0 3px 1px #227755;
outline: none;
}
.select .optList {
position: absolute;
top: 100%;
left: 0;
}
.select .optList.hidden {
max-height: 0;
visibility: hidden;
}
/* ------------ */
/* Styles Chic */
/* ------------ */
.select {
font-size: 0.625em; /* 10px */
font-family: Verdana, Arial, sans-serif;
-moz-box-sizing: border-box;
box-sizing: border-box;
padding: 0.1em 2.5em 0.2em 0.5em; /* 1px 25px 2px 5px */
width: 10em; /* 100px */
border: 0.2em solid #000; /* 2px */
border-radius: 0.4em; /* 4px */
box-shadow: 0 0.1em 0.2em rgba(0, 0, 0, 0.45); /* 0 1px 2px */
background: #f0f0f0;
background: -webkit-linear-gradient(90deg, #e3e3e3, #fcfcfc 50%, #f0f0f0);
background: linear-gradient(0deg, #e3e3e3, #fcfcfc 50%, #f0f0f0);
}
.select .value {
display: inline-block;
width: 100%;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
vertical-align: top;
}
.select:after {
content: "▼";
position: absolute;
z-index: 1;
height: 100%;
width: 2em; /* 20px */
top: 0;
right: 0;
padding-top: 0.1em;
-moz-box-sizing: border-box;
box-sizing: border-box;
text-align: center;
border-left: 0.2em solid #000;
border-radius: 0 0.1em 0.1em 0;
background-color: #000;
color: #fff;
}
.select .optList {
z-index: 2;
list-style: none;
margin: 0;
padding: 0;
background: #f0f0f0;
border: 0.2em solid #000;
border-top-width: 0.1em;
border-radius: 0 0 0.4em 0.4em;
box-shadow: 0 0.2em 0.4em rgba(0, 0, 0, 0.4);
-moz-box-sizing: border-box;
box-sizing: border-box;
min-width: 100%;
max-height: 10em; /* 100px */
overflow-y: auto;
overflow-x: hidden;
}
.select .option {
padding: 0.2em 0.3em;
}
.select .highlight {
background: #000;
color: #ffffff;
}
Contenu JavaScript
js
// ----------- //
// UTILITAIRES //
// ----------- //
NodeList.prototype.forEach = function (callback) {
Array.prototype.forEach.call(this, callback);
};
// ------------------------- //
// Définitions des fonctions //
// ------------------------- //
function deactivateSelect(select) {
if (!select.classList.contains("active")) return;
var optList = select.querySelector(".optList");
optList.classList.add("hidden");
select.classList.remove("active");
}
function activeSelect(select, selectList) {
if (select.classList.contains("active")) return;
selectList.forEach(deactivateSelect);
select.classList.add("active");
}
function toggleOptList(select, show) {
var optList = select.querySelector(".optList");
optList.classList.toggle("hidden");
}
function highlightOption(select, option) {
var optionList = select.querySelectorAll(".option");
optionList.forEach(function (other) {
other.classList.remove("highlight");
});
option.classList.add("highlight");
}
function updateValue(select, index) {
var nativeWidget = select.previousElementSibling;
var value = select.querySelector(".value");
var optionList = select.querySelectorAll(".option");
optionList.forEach(function (other) {
other.setAttribute("aria-selected", "false");
});
optionList[index].setAttribute("aria-selected", "true");
nativeWidget.selectedIndex = index;
value.innerHTML = optionList[index].innerHTML;
highlightOption(select, optionList[index]);
}
function getIndex(select) {
var nativeWidget = select.previousElementSibling;
return nativeWidget.selectedIndex;
}
// -------------------- //
// Liens aux événements //
// -------------------- //
window.addEventListener("load", function () {
var form = document.querySelector("form");
form.classList.remove("no-widget");
form.classList.add("widget");
});
window.addEventListener("load", function () {
var selectList = document.querySelectorAll(".select");
selectList.forEach(function (select) {
var optionList = select.querySelectorAll(".option"),
selectedIndex = getIndex(select);
select.tabIndex = 0;
select.previousElementSibling.tabIndex = -1;
updateValue(select, selectedIndex);
optionList.forEach(function (option, index) {
option.addEventListener("mouseover", function () {
highlightOption(select, option);
});
option.addEventListener("click", function (event) {
updateValue(select, index);
});
});
select.addEventListener("click", function (event) {
toggleOptList(select);
});
select.addEventListener("focus", function (event) {
activeSelect(select, selectList);
});
select.addEventListener("blur", function (event) {
deactivateSelect(select);
});
select.addEventListener("keyup", function (event) {
var length = optionList.length,
index = getIndex(select);
if (event.keyCode === 40 && index < length - 1) {
index++;
}
if (event.keyCode === 38 && index > 0) {
index--;
}
updateValue(select, index);
});
});
});