本文簡單實現jQuery無限級聯效果，分享給大家供大家參考，具體內容如下
效果圖：
圖1 僅下拉框
圖2 層級提示+下拉框
圖3 存儲數據點擊響應
主要包含3個文件：index.html（主頁），wuxianjilian.php（數據處理），wuxianjilian.sql（MySQL數據文件）
1. index.html
<html><head> <title>無限級聯</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="http://files.cnblogs.com/Zjmainstay/jquery-1.6.2.min.js"></script></head><body><div id="jilianContainer"></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(); //移除后面所有子級下拉菜單 $(".selection:last").after(data); //添加子級下拉菜單 }else { $("#jilianContainer").append(data); //初始加載情況 } //所有下拉響應 $(".selection").unbind().change(function(){ getData($(this)); }); }, error:function(msg){ alert('error'); } }); } //Init getData($(this)); });</script><!-- 數據存儲示例，僅提取數據，不做操作 --><div style="height:100px;display:block;"></div><input type="button" value="存儲數據" id="save"></input><script type="text/javascript">$(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"); //數據庫連接操作 $conn = mysql_connect("localhost","Zjmainstay","") or die("Can not connect to database.Fatal error handle by ". __FILE__); mysql_select_db("test",$conn); //數據庫名為 test mysql_query("SET NAMES utf8",$conn); //獲取父級id $pid = (int)$_POST['pid']; //查詢子級 $sql = "SELECT id,text FROM `wuxianjilian` WHERE pid={$pid}"; $result = mysql_query($sql,$conn); //組裝子級下拉菜單 $html = ''; while($row = mysql_fetch_assoc($result)){ $html .= '<option value="'.$row['id'].'">'.$row['text'].'</option>'; } if(!empty($html)) $html = '<select class="selection"><option value="">請選擇</option>' . $html . '</select>'; //輸出下拉菜單 echo json_encode($html);//End_php
3. wuxianjilian.sql
wuxianjilian.sql/*Navicat MySQL Data TransferSource Server : localhostSource Server Version : 50516Source Host : localhost:3306Source Database : testTarget Server Type : MYSQLTarget Server Version : 50516File Encoding : 65001Date: 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');如果大家還想深入學習，可以點擊jquery下拉框效果匯總、JavaScript下拉框效果匯總進行學習。
希望本文所述對大家學習jquery程序設計有所幫助。
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