jQuery+PHP+MySQL实现无限级联下拉框效果_jquery

　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

 
 
 
 




$(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));
 
});

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)){
 $html .= ''.$row['text'].'';
 }

 if(!empty($html)) $html = '请选择' . $html . '';
 
 //

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');

希望本文所述对大家学习jquery程序设计有所帮助。