通过 fieldset 的 radioboxes 和 textboxes 模拟一个可编辑的 <select> - 在线编辑器

<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Editable [pseudo]select</title>
<style type="text/css">

/* Generic form fields */

fieldset.elist, input[type="text"], textarea, select, option, fieldset.elist ul, fieldset.elist > legend, fieldset.elist input[type="text"], fieldset.elist > legend:after {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

input[type="text"] {
	padding: 0 20px;
}

textarea {
	width: 500px;
	height: 200px;
	padding: 20px;
}

textarea, input[type="text"], fieldset.elist ul, select, fieldset.elist > legend {
	border: 2px #cccccc solid;
	border-radius: 10px;
}

input[type="text"], fieldset.elist, select, fieldset.elist > legend {
	height: 32px;
	font-family: Tahoma;
	font-size: 14px;
}

input[type="text"]:hover, textarea:hover, select:hover, fieldset.elist:hover > legend {
	background-color: #ddddff;
}

select {
	padding: 4px 20px;
}

option {
	height: 30px;
	padding: 5px 4px;
}

option:not(:checked), textarea:focus {
	background-color: #ffcccc;
}

fieldset.elist > legend:after, fieldset.elist label {
	height: 28px;
}

input[type="text"], fieldset.elist {
	width: 316px;
}

input[type="text"]:focus {
	background: #ffcccc url("data:image/gif;base64,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") no-repeat 2px center !important;
}

input[type="text"]:focus, textarea:focus, select:focus, fieldset.elist > legend {
	border: 2px #ccaaaa solid;
}

fieldset {
	border: 2px #af3333 solid;
	border-radius: 10px;
}

/* Editable [pseudo]select (i.e. fieldsets with [class=elist]) */

fieldset.elist {
	display: inline-block;
	position: relative;
	vertical-align: middle;
	overflow: visible;
	padding: 0;
	margin: 0;
	border: none;
}

fieldset.elist ul {
	position: absolute;
	width: 100%;
	max-height: 320px;
	padding: 0;
	margin: 0;
	overflow: hidden;
	background-color: transparent;
}

fieldset.elist:hover ul {
	background-color: #ffffff;
	border: 2px #af3333 solid;
	left: 2px;
	overflow: auto;
}

fieldset.elist ul > li {
	list-style-type: none;
	background-color: transparent;
}

fieldset.elist label {
	display: none;
	width: 100%;
}

fieldset.elist input[type="text"] {
	width: 100%;
	height: 30px;
	line-height: 30px;
	border: none;
	background-color: transparent;
	border-radius: 0;
}

fieldset.elist > legend {
	display: block;
	margin: 0;
	padding: 0 0 0 5px;
	position: absolute;
	width: 100%;
	cursor: default;
	background-color: #ccffcc;
	line-height: 30px;
	font-style: italic;
}

fieldset.elist:hover > legend {
	position: relative;
	overflow: hidden;
}

fieldset.elist > legend:after {
	width: 20px;
	content: "\2335";
	float: right;
	text-align: center;
	border-left: 2px #cccccc solid;
	font-style: normal;
	cursor: default;
}

fieldset.elist:hover > legend:after {
	background-color: #99ff99;
}

fieldset.elist ul input[type="radio"] {
	display: none;
}

fieldset.elist input[type="radio"]:checked ~ label {
	display: block;
	width: 292px;
	background-color: #ffffff;
}

fieldset.elist:hover input[type="radio"]:checked ~ label {
	width: 100%;
}

fieldset.elist:hover label {
	display: block;
	height: 100%;
}

fieldset.elist label:hover {
	background-color: #3333ff !important;
}

fieldset.elist:hover input[type="radio"]:checked ~ label {
	background-color: #aaaaaa;
}

</style>

</head>
<body>

<form name="tshirt" method="get" action="test.php">

<fieldset>
	<legend>Order a T-Shirt</legend>
	<p>Write your name (simple textbox): <input type="text" name="myname" /></p>
	<p>Choose your size (simple select):
	<select name="size">
		<option value="s">Small</option>
		<option value="m">Medium</option>
		<option value="l">Large</option>
		<option value="xl">Extra Large</option>
	</select></p>
	<div>What address do you want to use? (editabile pseudoselect)
	<fieldset class="elist">
		<legend>Address&hellip;</legend>
		<ul>
			<li><input type="radio" name="address-chosen" value="1" id="address-switch_1" checked /><label for="address-switch_1"><input type="text" name="address-item_1" value="19 Quaker Ridge Rd. Bethel CT 06801" /></label></li>
			<li><input type="radio" name="address-chosen" value="2" id="address-switch_2" /><label for="address-switch_2"><input type="text" name="address-item_2" value="1000 Coney Island Ave. Brooklyn NY 11230" /></label></li>
			<li><input type="radio" name="address-chosen" value="3" id="address-switch_3" /><label for="address-switch_3"><input type="text" name="address-item_3" value="2962 Dunedin Cv. Germantown TN 38138" /></label></li>
			<li><input type="radio" name="address-chosen" value="4" id="address-switch_4" /><label for="address-switch_4"><input type="text" name="address-item_4" value="915 E 7th St. Apt 6L. Brooklyn NY 11230" /></label></li>
		</ul>
	</fieldset>
	</div>
	<p>Write a comment:<br />
	<textarea name="comment"></textarea></p>
	<p><input type="reset" value="Reset" /> <input type="submit" value="Send!" /></p>
</fieldset>

</form>

</body>
</html>
​x
 
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Editable [pseudo]select</title>
<style type="text/css">
​
/* Generic form fields */
​
fieldset.elist, input[type="text"], textarea, select, option, fieldset.elist ul, fieldset.elist > legend, fieldset.elist input[type="text"], fieldset.elist > legend:after {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
​
input[type="text"] {
    padding: 0 20px;
}
​
textarea {
    width: 500px;
    height: 200px;
    padding: 20px;
}