javascript 二级联动

最新推荐文章于 2020-10-28 14:26:26 发布

weixin_30849403

最新推荐文章于 2020-10-28 14:26:26 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/meimao5211/p/3209604.html

本文介绍了一个使用JavaScript和HTML实现的动态下拉菜单系统。该系统可根据用户在第一个下拉菜单中的选择动态更新第二个下拉菜单的内容。通过这种方式，能够为用户提供更加灵活且交互性更强的选择体验。

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<html> 
<head> 
<title></title> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 

<style> 
body,select 
{ 
font-size:9pt; 
font-family:Verdana; 
} 
a 
{ 
color:red; 
text-decoration:none; 
} 
a:hover{ 
text-decoration:underline; 
} 
</style> 
<SCRIPT LANGUAGE="JavaScript"> 
<!-- 
function Dsy() 
{ 
this.Items = {}; 
} 
Dsy.prototype.add = function(id,iArray) 
{ 
this.Items[id] = iArray; 
} 
Dsy.prototype.Exists = function(id) 
{ 
if(typeof(this.Items[id]) == "undefined") return false; 
return true; 
} 

function change(v){ 
var str="0"; 
for(i=0;i<v;i++){ str+=("_"+(document.getElementById(s[i]).selectedIndex-1));}; 
var ss=document.getElementById(s[v]); 
with(ss){ 
length = 0; 
options[0]=new Option(opt0[v],opt0[v]); 
if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v) 
{ 
if(dsy.Exists(str)){ 
ar = dsy.Items[str]; 
for(i=0;i<ar.length;i++)options[length]=new Option(ar[i],ar[i]); 
if(v)options[1].selected = true; 
} 
} 
if(++v<s.length){change(v);} 
} 
} 

var dsy = new Dsy(); 

dsy.add("0",["1","2","3","4"]); 

dsy.add("0_0",["11","12","13"]); 
dsy.add("0_1",["21","22","23"]); 
dsy.add("0_2",["31","32","33"]); 
dsy.add("0_3",["41","42","43"]); 

//--> 
</SCRIPT> 
<SCRIPT LANGUAGE = JavaScript> 

var s=["s1","s2"]; 
var opt0 = ["请选择","请选择"]; 
function setup() 
{ 
for(i=0;i<s.length-1;i++) 
document.getElementById(s[i]).onchange=new Function("change("+(i+1)+")"); 
change(0); 
} 
//--> 
</SCRIPT> 
</head> 
<body bgcolor="#E0E0E0" onload="setup()"> 

<form name="frm" action="11.jsp"> 
<select id="s1" name="s1"><option></option></select> 
<select id="s2" name="s2"><option></option></select> 
<input type="submit" name="Submit" value="提交"> 
</form> 
</body> 
</html> 

------

11.jsp

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
String s1 = request.getParameter("s1");
String s2 = request.getParameter("s2");
out.println(s1);
out.println(s2);

%>
</body>
</html>

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yinyong:http://zhidao.baidu.com/question/74257440.html

转载于:https://www.cnblogs.com/meimao5211/p/3209604.html