很简单的js上拉框联动 _JavaScript

很简单的js下拉框联动

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> <script> function setSecond(obj){ var val = obj.value; if(val == 'en'){ var sec = document.getElementById('second'); sec.innerHTML = "<option>one</option><option>two</option>"; }else{ var sec = document.getElementById('second'); sec.innerHTML = "<option>一</option><option>二</option>"; } } </script> </head> <body> <div> <select id="first" onchange="setSecond(this)"> <option value="en">en</option> <option value="zh">zh</option> </select> </div> <div> <select id="second"> </select> </div> </body> </html>

简单效果图：

使用innerHTML，IE浏览器不支持这种方法的，所以改进方法：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script>
function setSecond(obj){
	var val = obj.value;
	if(val == 'en'){
		var sec = document.getElementById('second');
		sec.options[0] = new Option("one","one");
		sec.options[1] = new Option("two","two");
	}else{
		var sec = document.getElementById('second');
		sec.options[0] = new Option("一","one");
		sec.options[1] = new Option("二","two");//可设置循环配置，也可一个一个配置
	}	
}
</script>
</head>

<body>
<div> 
    <select id="first" onchange="setSecond(this)">
        <option value="en">en</option>
        <option value="zh">zh</option>
    </select> 
</div>
<div> 
    <select id="second">

    </select> 
</div>
</body>
</html>

可以兼容火狐，IE等