jQuery+PHP+MySQL实现无限级联下拉框效果

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本文简单实现jQuery无限级联效果，分享给大家供大家参考，具体内容如下
效果图：

　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



  <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="http://files.cnblogs.com/Zjmainstay/jquery-1.6.2.min.js"></script><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 style="height:100px;display:block;"></div>
<input type="button" value="存储数据" id="save"><script type="text/javascript">
$(document).ready(function(){
  $("#save").click(function(){
    var data = [];
    $(".selection").each(function(){
      data.push($.trim($(this).val()));
    })
    
    alert(data.join(','));
  });
});
</script><p><br>
2. wuxianjilian.php<br></p>
<div class="jb51code">
<pre class="brush:php;toolbar:false">
'.$row['text'].'';
  }

  if(!empty($html)) $html = '<select class="selection"><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');

希望本文所述对大家学习jquery程序设计有所帮助。