PHP和Ajax实现二级联动下拉菜单（代码、详细注释）
2012-12-07 09:55
986 查看
数据库
...............................................................................................................................
...............................................................................................................................
test.html
................................................................................................................................
<html>
<head><title>php_ajax联动下拉菜单</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<script language="javascript" src="ajax.js"></script>
<script language="javascript">
function query(){
var pid = document.getElementByIdx("bigClassName").value;
if(pid!=""){
createRequest('query.php?pid='+pid);
}
}
</script>
</head>
<body>
<form action="<?=$PHP_SELF?>?" name="class" method="get" >
<select name="bigClassName" id="bigClassName" onchange="query()">
<option value="">--选择大类--</option>
<?php
$link=mysql_connect("localhost","root","root");
mysql_select_db("sortclass") or die("没有此数据库！");
$sql="select cid,cname from class where pid=0";
mysql_query("set names gb2312");
$res=mysql_query($sql,$link);
while($result=mysql_fetch_assoc($res)){
echo "<option value='".$result["cid"]."'>".$result["cname"]."</option>";
}
?>
</select>
<select name="smallClassName" id="smallClassName">
<option value="">--选择小类--</option>
</select>
<input type="submit" value="提交" />
</form>
</body>
</html>
........................................................................................................................................
ajax.js
........................................................................................................................................
var http_request = false;
function createRequest(url) {
//初始化对象并发出XMLHttpRequest请求
http_request = false;
if (window.XMLHttpRequest) { //Mozilla等其他浏览器
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {
http_request.overrideMimeType("text/xml");
}
} else if (window.ActiveXObject) { //IE浏览器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) {
alert("不能创建XMLHTTP实例!");
return false;
}
http_request.onreadystatechange = alertContents; //指定响应方法
http_request.open("GET", url, true); //发出HTTP请求
http_request.send(null);
}
function alertContents() { //处理服务器返回的信息
if (http_request.readyState == 4) {
if (http_request.status == 200) {
var smallClassName=document.getElementByIdx("smallClassName");
var dataArray=[];
//alert(http_request.responseText);
myVariable=http_request.responseText;//形如: 1,新闻中心;2,学习园地;
var stringArray = myVariable.split(";");//以;分隔字符串
stringArray.pop();//移除数组最后一个元素,stringArray[0]==1,新闻中心 stringArray[1]==2,学习园地
var len=stringArray.length;
for(var i=0;i<len;i++){
dataArray[i]= stringArray[i].split(",");// 循环数据条数按,分割字符串
}
//alert(dataArray[1][0]);//返回 新闻中心
//初始化smallClassName的数据
smallClassName.length=0;
var alertOption=document.createElement_x("OPTION");
alertOption.value="";
alertOption.text="--选择小类--";
smallClassName.add(alertOption);
for(var j=0;j<len;j++){//添加数据
var objOption=document.createElement_x("OPTION");
objOption.value = dataArray[j][0];
objOption.text = dataArray[j][1];
smallClassName.add(objOption);
}
} else {
alert('您请求的页面发现错误');
}
}
}
...................................................................................................................................
query.php
...................................................................................................................................
<?php
error_reporting(E_ERROR|E_WARNING|E_PARSE);
$link=mysql_connect("localhost","root","root");
mysql_select_db("sortclass",$link) or die("no such database!");
//$GB2312string=iconv( 'UTF-8', 'gb2312//IGNORE' , $RequestAjaxString); //Ajax中先用encodeURIComponent对要提交的中文进行编码
mysql_query("set names gb2312");
$pid=$_GET[pid];
$res=mysql_query("select cid,cname from class where pid='$pid'",$link);
header('Content-type: text/html;charset=GB2312'); //指定发送数据的编码格式为GB2312
while($info=mysql_fetch_array($res)){
$str.=$info["cid"].",".$info["cname"];
$str.=";";
}
echo $str;
?>
...............................................................................................................................
...............................................................................................................................
test.html
................................................................................................................................
<html>
<head><title>php_ajax联动下拉菜单</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<script language="javascript" src="ajax.js"></script>
<script language="javascript">
function query(){
var pid = document.getElementByIdx("bigClassName").value;
if(pid!=""){
createRequest('query.php?pid='+pid);
}
}
</script>
</head>
<body>
<form action="<?=$PHP_SELF?>?" name="class" method="get" >
<select name="bigClassName" id="bigClassName" onchange="query()">
<option value="">--选择大类--</option>
<?php
$link=mysql_connect("localhost","root","root");
mysql_select_db("sortclass") or die("没有此数据库！");
$sql="select cid,cname from class where pid=0";
mysql_query("set names gb2312");
$res=mysql_query($sql,$link);
while($result=mysql_fetch_assoc($res)){
echo "<option value='".$result["cid"]."'>".$result["cname"]."</option>";
}
?>
</select>
<select name="smallClassName" id="smallClassName">
<option value="">--选择小类--</option>
</select>
<input type="submit" value="提交" />
</form>
</body>
</html>
........................................................................................................................................
ajax.js
........................................................................................................................................
var http_request = false;
function createRequest(url) {
//初始化对象并发出XMLHttpRequest请求
http_request = false;
if (window.XMLHttpRequest) { //Mozilla等其他浏览器
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {
http_request.overrideMimeType("text/xml");
}
} else if (window.ActiveXObject) { //IE浏览器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) {
alert("不能创建XMLHTTP实例!");
return false;
}
http_request.onreadystatechange = alertContents; //指定响应方法
http_request.open("GET", url, true); //发出HTTP请求
http_request.send(null);
}
function alertContents() { //处理服务器返回的信息
if (http_request.readyState == 4) {
if (http_request.status == 200) {
var smallClassName=document.getElementByIdx("smallClassName");
var dataArray=[];
//alert(http_request.responseText);
myVariable=http_request.responseText;//形如: 1,新闻中心;2,学习园地;
var stringArray = myVariable.split(";");//以;分隔字符串
stringArray.pop();//移除数组最后一个元素,stringArray[0]==1,新闻中心 stringArray[1]==2,学习园地
var len=stringArray.length;
for(var i=0;i<len;i++){
dataArray[i]= stringArray[i].split(",");// 循环数据条数按,分割字符串
}
//alert(dataArray[1][0]);//返回 新闻中心
//初始化smallClassName的数据
smallClassName.length=0;
var alertOption=document.createElement_x("OPTION");
alertOption.value="";
alertOption.text="--选择小类--";
smallClassName.add(alertOption);
for(var j=0;j<len;j++){//添加数据
var objOption=document.createElement_x("OPTION");
objOption.value = dataArray[j][0];
objOption.text = dataArray[j][1];
smallClassName.add(objOption);
}
} else {
alert('您请求的页面发现错误');
}
}
}
...................................................................................................................................
query.php
...................................................................................................................................
<?php
error_reporting(E_ERROR|E_WARNING|E_PARSE);
$link=mysql_connect("localhost","root","root");
mysql_select_db("sortclass",$link) or die("no such database!");
//$GB2312string=iconv( 'UTF-8', 'gb2312//IGNORE' , $RequestAjaxString); //Ajax中先用encodeURIComponent对要提交的中文进行编码
mysql_query("set names gb2312");
$pid=$_GET[pid];
$res=mysql_query("select cid,cname from class where pid='$pid'",$link);
header('Content-type: text/html;charset=GB2312'); //指定发送数据的编码格式为GB2312
while($info=mysql_fetch_array($res)){
$str.=$info["cid"].",".$info["cname"];
$str.=";";
}
echo $str;
?>
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- php ajax实现的二级（多级）联动菜单(2008-10-21,11:36:08)
- jQuery+PHP+MySQL实现二级联动下拉菜单
- php ajax实现的二级（多级）联动菜单(2008-10-21,11:36:08)
- asp.net DropDownList无刷新ajax二级联动实现详细过程
- Ajax结合php实现二级联动
- PHP 缓存实现代码及详细注释
- AJAX调用页面后台代码方法实现下拉框二级联动效果
- asp.net DropDownList无刷新ajax二级联动实现详细过程
- Ajax二级联动菜单实现原理及代码
- asp.net下使用AjaxPro实现二级联动代码
- asp.net DropDownList无刷新ajax二级联动实现详细过程
- PHP-二级联动下拉菜单之Form提交法实现
- asp.net DropDownList无刷新ajax二级联动实现详细过程
- php和javascript实现二级联动下拉菜单
- PHP 缓存实现代码及详细注释
- 利用php+jQuery+ajax实现汽车车型四级联动下拉菜单
- PHP 图片上传实现代码 带详细注释
- jQuery+PHP+MySQL实现二级联动下拉菜单
- PHP 图片上传实现代码 带详细注释