本文实例讲述了js显示下拉列表框内全部元素的方法。分享给大家供大家参考。具体如下：
下面的js代码可以通过alert框显示指定下拉列表的全部元素
<!doctype html>
<html>
<head>
<script>
function getoptions()
{
var x=document.getelementbyid(myselect);
var txt=all options: ;
var i;
for (i=0;i<x.length;i++)
{
txt=txt + \n + x.options[i].text;
}
alert(txt);
}
</script>
</head>
<body>
<form>
select your favorite fruit:
<select id=myselect>
<option>apple</option>
<option>orange</option>
<option>pineapple</option>
<option>banana</option>
</select>
<br><br>
<input type=button onclick=getoptions()
value=output all options>
</form>
</body>
</html>