图1 仅下拉框
图2 层级提示+下拉框
图3 存储数据点击响应
主要包含3个文件：index.html（主页），wuxianjilian.php（数据处理），wuxianjilian.sql（MySQL数据文件）
1. index.html
<html> <head> <title>无限级联</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="zh-CN" /> <script type="text/javascript" src="https://files.cnblogs.com/Zjmainstay/jquery-1.6.2.min.js"></script> </head> <body> <div></div> <script type="text/javascript"> $(document).ready(function(){ var getData = function(obj){ $.ajax({ url:'wuxianjilian.php', type:'POST', data:{"pid":obj.val()}, dataType:'json', async:false, success:function(data){ if($(".selection").length){ $(".selection:gt("+$(obj).index()+")").remove(); //移除后面所有子级下拉菜单 $(".selection:last").after(data); //添加子级下拉菜单 }else { $("#jilianContainer").append(data); //初始加载情况 } //所有下拉响应 $(".selection").unbind().change(function(){ getData($(this)); }); }, error:function(msg){ alert('error'); } }); } //Init getData($(this)); }); </script> <!-- 数据存储示例，仅提取数据，不做操作 --> <div></div> <input type="button" value="存储数据"></input> <script type="text/javascript"> $(document).ready(function(){ $("#save").click(function(){ var data = []; $(".selection").each(function(){ data.push($.trim($(this).val())); }) alert(data.join(',')); }); }); </script> </body> </html>
2. wuxianjilian.php
<?php header("Content-type: text/html; charset=utf-8"); //数据库连接操作 $conn = mysql_connect("localhost","Zjmainstay","") or die("Can not connect to database.Fatal error handle by ". __FILE__); mysql_select_db("test",$conn); //数据库名为 test mysql_query("SET NAMES utf8",$conn); //获取父级id $pid = (int)$_POST['pid']; //查询子级 $sql = "SELECT id,text FROM `wuxianjilian` WHERE pid={$pid}"; $result = mysql_query($sql,$conn); //组装子级下拉菜单 $html = ''; while($row = mysql_fetch_assoc($result)){ $html .= '<option value="'.$row['id'].'">'.$row['text'].'</option>'; } if(!empty($html)) $html = '<select><option value="">请选择</option>' . $html . '</select>'; //输出下拉菜单 echo json_encode($html); //End_php
3. wuxianjilian.sql
wuxianjilian.sql /* Navicat MySQL Data Transfer Source Server : localhost Source Server Version : 50516 Source Host : localhost:3306 Source Database : test Target Server Type : MYSQL Target Server Version : 50516 File Encoding : 65001 Date: 2012-10-24 20:59:09 */ SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for `wuxianjilian` -- ---------------------------- DROP TABLE IF EXISTS `wuxianjilian`; CREATE TABLE `wuxianjilian` ( `id` int(11) NOT NULL AUTO_INCREMENT, `pid` int(11) DEFAULT NULL, `text` varchar(32) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of wuxianjilian -- ---------------------------- INSERT INTO `wuxianjilian` VALUES ('1', '0', 'A0'); INSERT INTO `wuxianjilian` VALUES ('2', '0', 'B0'); INSERT INTO `wuxianjilian` VALUES ('3', '1', 'C1'); INSERT INTO `wuxianjilian` VALUES ('4', '1', 'D1'); INSERT INTO `wuxianjilian` VALUES ('5', '1', 'E1'); INSERT INTO `wuxianjilian` VALUES ('6', '2', 'F2'); INSERT INTO `wuxianjilian` VALUES ('7', '2', 'G2'); INSERT INTO `wuxianjilian` VALUES ('8', '3', 'H3'); INSERT INTO `wuxianjilian` VALUES ('9', '3', 'I3'); INSERT INTO `wuxianjilian` VALUES ('10', '3', 'J3'); INSERT INTO `wuxianjilian` VALUES ('11', '3', 'K3'); INSERT INTO `wuxianjilian` VALUES ('12', '4', 'L4'); INSERT INTO `wuxianjilian` VALUES ('13', '4', 'M4'); INSERT INTO `wuxianjilian` VALUES ('14', '8', 'N8'); INSERT INTO `wuxianjilian` VALUES ('15', '9', 'N9'); INSERT INTO `wuxianjilian` VALUES ('16', '14', 'O14'); INSERT INTO `wuxianjilian` VALUES ('17', '14', 'P14'); INSERT INTO `wuxianjilian` VALUES ('18', '14', 'Q14'); INSERT INTO `wuxianjilian` VALUES ('19', '17', 'R17'); INSERT INTO `wuxianjilian` VALUES ('20', '17', 'S18'); INSERT INTO `wuxianjilian` VALUES ('21', '20', 'T20');
如果大家还想深入学习，可以点击jquery下拉框效果汇总、JavaScript下拉框效果汇总进行学习。