求一段代码，是关于从数据库里读取数据到三级联动下拉列表的解决思路
日期：2014-05-17 浏览次数：20843 次
求一段代码，是关于从数据库里读取数据到三级联动下拉列表的
在网上看了一些关于asp+js读取数据库的三级联动代码，但是大部分都是数据库里为三个表
我的数据库里只有一个表，字段分别是 id 一级类别 二级类别 三级类别 ，这样的三级联动应该怎么写呢，尝试了几次都失败了，特求一段代码
功用：在提交表单里用三级联动选择出对应的值，写到数据库另一表里。
------解决方案--------------------
从数据库中取相应的数据，需要关联的查询。
建议采用页面直接加载代码。
有两种方法，
1。网上搜省市三级联动 js的文件，再在相应的网页里引用。
2。代码直接复制，如下:
<!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>
<title>省市县关联菜单</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="Generator" content="EditPlus">
<meta name="Author" content="fason,阿信,蒲佛信">
<meta name="Keywords" content="下拉菜单,关联,多级,fason,阿信,蒲佛信">
<meta name="Description" content="此程序为简单的省市县关联下拉菜单，有问题请往fason_pfx@hotmail.com发信">
<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",["安徽","北京","福建","甘肃"]);
dsy.add("0_0",["安庆","蚌埠","巢湖","池州","滁州","阜阳","合肥","淮北","淮南","黄山","六安","马鞍山","宿州","铜陵","芜湖","宣城","亳州"]);
dsy.add("0_0_0",["安庆市","怀宁县","潜山县","宿松县","太湖县","桐城市","望江县","岳西县","枞阳县"]);
dsy.add("0_0_1",["蚌埠市","固镇县","怀远县","五河县"]);
dsy.add("0_0_2",["巢湖市","含山县","和县","庐江县","无为县"]);
dsy.add("0_0_3",["池州市","东至县","青阳县","石台县"]);
dsy.add("0_0_4",["滁州市","定远县","凤阳县","来安县","明光市","全椒县","天长市"]);
dsy.add("0_0_5",["阜南县","阜阳市","界首市","临泉县","太和县","颖上县"]);
dsy.add("0_0_6",["长丰县","肥东县","肥西县"]);
dsy.add("0_0_7",["淮北市","濉溪县"]);
dsy.add("0_0_8",["凤台县","淮南市"]);
dsy.add("0_0_9",["黄山市","祁门县","休宁县","歙县","黟县"]);
dsy.add("0_0_10",["霍邱县","霍山县","金寨县","六安市","寿县","舒城县"]);
dsy.add("0_0_11",["当涂县&q
在网上看了一些关于asp+js读取数据库的三级联动代码，但是大部分都是数据库里为三个表
我的数据库里只有一个表，字段分别是 id 一级类别 二级类别 三级类别 ，这样的三级联动应该怎么写呢，尝试了几次都失败了，特求一段代码
功用：在提交表单里用三级联动选择出对应的值，写到数据库另一表里。
------解决方案--------------------
从数据库中取相应的数据，需要关联的查询。
建议采用页面直接加载代码。
有两种方法，
1。网上搜省市三级联动 js的文件，再在相应的网页里引用。
2。代码直接复制，如下:
<!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>
<title>省市县关联菜单</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="Generator" content="EditPlus">
<meta name="Author" content="fason,阿信,蒲佛信">
<meta name="Keywords" content="下拉菜单,关联,多级,fason,阿信,蒲佛信">
<meta name="Description" content="此程序为简单的省市县关联下拉菜单，有问题请往fason_pfx@hotmail.com发信">
<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",["安徽","北京","福建","甘肃"]);
dsy.add("0_0",["安庆","蚌埠","巢湖","池州","滁州","阜阳","合肥","淮北","淮南","黄山","六安","马鞍山","宿州","铜陵","芜湖","宣城","亳州"]);
dsy.add("0_0_0",["安庆市","怀宁县","潜山县","宿松县","太湖县","桐城市","望江县","岳西县","枞阳县"]);
dsy.add("0_0_1",["蚌埠市","固镇县","怀远县","五河县"]);
dsy.add("0_0_2",["巢湖市","含山县","和县","庐江县","无为县"]);
dsy.add("0_0_3",["池州市","东至县","青阳县","石台县"]);
dsy.add("0_0_4",["滁州市","定远县","凤阳县","来安县","明光市","全椒县","天长市"]);
dsy.add("0_0_5",["阜南县","阜阳市","界首市","临泉县","太和县","颖上县"]);
dsy.add("0_0_6",["长丰县","肥东县","肥西县"]);
dsy.add("0_0_7",["淮北市","濉溪县"]);
dsy.add("0_0_8",["凤台县","淮南市"]);
dsy.add("0_0_9",["黄山市","祁门县","休宁县","歙县","黟县"]);
dsy.add("0_0_10",["霍邱县","霍山县","金寨县","六安市","寿县","舒城县"]);
dsy.add("0_0_11",["当涂县&q
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