jQuery+PHP+MySQL achieves infinite cascading drop-down box effect

jQuery+PHP+MySQL achieves infinite cascading drop-down box effect_jquery

WBOY

Release： 2016-05-16 15:14:49

Original

2111 people have browsed it

This article simply implements the infinite cascading effect of jQuery and shares it with everyone for your reference. The specific content is as follows
Rendering:

　Picture 1 drop-down box only

Figure 2 Level prompt + drop-down box

Figure 3 Storage data click response

Mainly contains 3 files: index.html (home page), wuxianjilian.php (data processing), wuxianjilian.sql (MySQL data file)
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="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"></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>

Copy after login

2. wuxianjilian.php

<&#63;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 class="selection"><option value="">请选择</option>' . $html . '</select>';
  
  //输出下拉菜单
  echo json_encode($html);
//End_php

Copy after login

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');

Copy after login

I hope this article will be helpful to everyone learning jquery programming.