本文实例讲述了js实现Select列表各项上移和下移的方法。分享给大家供大家参考。具体如下：
这里介绍Select列表各项上移和下移的Js代码，可以手功排序，以前我们都见到过的，从事WEB编程的朋友经常会用得到。
运行效果如下图所示：
在线演示地址如下：
http://demo.jb51.net/js/2015/js-select-move-up-down-codes/
具体代码如下：
<html>
<head>
<title>Select列表各项上移和下移</title>
<script>
function move(index,to) {
var list = document.form.list;
var total = list.options.length-1;
if (index == -1) return false;
if (to == +1 && index == total) return false;
if (to == -1 && index == 0) return false;
var items = new Array;
var values = new Array;
for (i = total; i >= 0; i--) {
items[i] = list.options[i].text;
values[i] = list.options[i].value;
}
for (i = total; i >= 0; i--) {
if (index == i) {
list.options[i + to] = new Option(items[i],values[i + to], 0, 1);
list.options[i] = new Option(items[i + to], values[i]);
i--;
}
else {
list.options[i] = new Option(items[i], values[i]);
}
}
list.focus();
}
function submitForm() {
var list = document.form.list;
var theList = "?";
for (i = 0; i <= list.options.length-1; i++) {
theList += "list" + list.options[i].value + "=" + list.options[i].text;
if (i != list.options.length-1) theList += "&";
}
location.href = document.form.action + theList;
}
</script>
</head>
<body>
<form method="GET" action="" name="form">
<table>
<tr>
<td align="middle">
<select name="list" size="4">
<option value="1">ASP</option>
<option value="2">PHP</option>
<option value="3">JSP</option>
<option value="4">JAVA</option>
</select><br><br>
<input type="button" value="submit" onClick="submitForm()">
</td>
<td valign="top">
<input type="button" value="↑"
onClick="move(this.form.list.selectedIndex,-1)"><br><br>
<input type="button" value="↓"
onClick="move(this.form.list.selectedIndex,+1)">
</td>
</tr>
</table>
</form>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
