求一个读数据库的二级联动菜单

[appgg]

我想点击第一个文本框第二个文本框就列出属于第一个文本框类的信息.
两个表分别保存两个地区的信息:
CREATE TABLE `news_bclass` (
`id` int(11) NOT NULL auto_increment,
`bname` varchar(50) default NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `id_2` (`id`),
KEY `id` (`id`)
) ;

CREATE TABLE `news_sclass` (
`id` int(20) NOT NULL auto_increment,
`sname` varchar(50) default NULL,
`bname` varchar(50) default NULL,
`parentid` int(20) default NULL,
PRIMARY KEY (`id`)
);

请问这段如何写?

[leakey8]

这个用js不就行了??

[appgg]

我的是读数据库的,也要用到JS

[appgg]

所以我不会写

[leakey8]

读数据库还有困难吗,不就select一下?

[appgg]

困难就在从第一个文本框传值给第二个文本框!!!

[leakey8]

onclick事件中用getElementById获得其值

[leakey8]

其实你可以将两级菜单全都读出来,再用js实现就行了.

[wxcyz]

<script LANGUAGE="javascript">
<!--
var subval = new Array();
<?php
$small_sql_lb = "SELECT * FROM prod_small_class";
$small_res_lb = db_query($small_sql_lb);
$small_num1_lb = db_num_rows($small_res_lb);
for ($i=0;$i<$small_num1_lb;$i++){
$small_row_lb = db_fetch_array($small_res_lb);
?>
subval[<?php echo $i?>] = new Array('<?php echo $small_row_lb['big_class']?>','<?php echo $small_row_lb['small_class_id']?>','<?php echo $small_row_lb['small_class_name']?>')
<?php
$small_num2_lb--;
}
?>
function changeselect1(locationid)
{
document.form1.s2.length = 0;
document.form1.s2.options[0] = new Option('==請選擇小類==','');

for (i=0; i<subval.length; i++)
{
if (subval[i][0] == locationid)
{document.form1.s2.options[document.form1.s2.length] = new Option(subval[i][2],subval[i][1]);}
}
}

//-->
</script>

<form action="" method="post" name="form1">
<select name="s1" onChange="changeselect1(this.value)">
<option>請選擇大類</option>
<?php
$sql_lb = "SELECT * FROM prod_class";
$res_lb = db_query($sql_lb);
$num1_lb = db_num_rows($res_lb);
$num2_lb = $num1_lb;
while ($num2_lb > 0){
$row_lb = db_fetch_array($res_lb);
?>
<option value="<?php echo $row_lb['prod_class_id']?>"><?php echo $row_lb['prod_class_name']?></option>
<?php
$num2_lb--;
}
?>
</select>
<select name="s2" onChange="changeselect2(this.value)">
<option>請選擇小類</option>
</select>
</form>

[wxcyz]

數據庫
CREATE TABLE `prod_class` (
`prod_class_id` int(11) NOT NULL auto_increment,
`prod_class_name` varchar(255) NOT NULL default '',
`prod_class_num` int(11) NOT NULL default '0',
PRIMARY KEY (`prod_class_id`),
KEY `prod_class_id` (`prod_class_id`)
) TYPE=MyISAM AUTO_INCREMENT=28 ;


CREATE TABLE `prod_small_class` (
`small_class_id` int(11) NOT NULL auto_increment,
`big_class` int(11) NOT NULL default '0',
`small_class_name` varchar(255) NOT NULL default '',
`small_class_contuct` longtext NOT NULL,
`small_class_num` int(11) NOT NULL default '0',
PRIMARY KEY (`small_class_id`)
) TYPE=MyISAM AUTO_INCREMENT=4 ;

[appgg]

谢谢楼上的,那提交到处理叶时怎样保存那两个(大类名,小类名)值?

[xiaopar]

<?php
function btype()
{
global $db;
$btype_query = $db->exec("select id,bname from news_bclass order by id desc") or die('查询失败');
$i=0;
while($btplist = $db->fetch($btype_query))
{
$btype_list.="<option value='".$btplist['id']."'>".$btplist['btype']."</option>";
}
return $btype_list;
}


$stype_query = $db->exec("select id,sname,parentid from stype") or die('查询失败');
$j=0;
while($stplist = $db->fetch($stype_query))
{
//$stype_list="<option value='".$stplist['id']."'>".$stplist['type']."</option>";
$stype_list.='Citys['.$j.'] =new Array("'.$stplist['btypeid'].'","'.$stplist['sid'].'","'.$stplist['stype'].'");';
$j=$j+1;
}
?>

<script language ="javascript" >
Citys = new Array();
<? echo $stype_list;?>

function changeselect(selvalue)
{
var selvalue = selvalue;
var i;
document.form1.s_class.length = 0 ;
document.form1.s_class.options[document.form1.s_class.length] = new Option("请选择","");
for (i = 0 ;i <Citys.length;i++)
{
if(Citys[i][0]==selvalue){
document.form1.s_class.options[document.form1.s_class.length] = new Option(Citys[i][2],Citys[i][1]);
}
}
}
document.form1.s_class.options[document.form1.s_class.length] = new Option("请选择","");
</script>

<DIV>
<select size="1" name="b_class" onchange ="changeselect(document.form1.b_class.options[document.form1.b_class.selectedIndex].value)">
<option value=''>选择大类</option>
<? echo btype();?></select>
<select size="1" name="s_class"></select>

<DIV>

[appgg]

楼上的,运行不通过!!!
表结构又不给出...

[wxcyz]

subval[<?php echo $i?>] = new Array('大類ID','小類ID','小類文字')


$_POST['s1'];大類
$_POST['s1'];小類

取的是ID值

[wxcyz]

subval[<?php echo $i?>] = new Array('大類ID','小類ID','小類文字')


$_POST['s1'];大類
$_POST['s2'];小類

取的是ID值

[wy2000490]

<?php

$query1=mysql_query("select * from country where language_kind = '0' order by id asc");
$fMenu="";
$fValue="";
while($data1=mysql_fetch_array($query1)){
$fMenu.="\"".$data1[name]."\",";
$fValue.="\"".$data1[id]."\",";

}
$fMenu=substr($fMenu,0,(strlen($fMenu)-1));
$fMenu="[".$fMenu."]";//*****************************得到var fMenu
$fValue=substr($fValue,0,(strlen($fValue)-1));
$fValue="[".$fValue."]";//*****************************得到var fValue

//得到*****************************var sMenu
$query1=mysql_query("select * from country where language_kind = '0' order by id asc");
while($data1=mysql_fetch_array($query1)){
$province_id1=$data1[id];

$query2=mysql_query("select * from province where province_id='$province_id1' order by province_id desc");
while($data2=mysql_fetch_array($query2)){
$num=mysql_num_rows($query2);
$i++;
$sMenu.="\"".$data2[name]."\",";
if($i==$num){
$sMenu="[".$sMenu."],[";
$i=0;
}
}
}
$sMenu.="]";
$sMenu=str_replace("\",]","\"]",$sMenu);
$sMenu=str_replace(",[]","]",$sMenu);
if((substr($sMenu,0,2))=="[\""){
$sMenu="[".$sMenu;
}else{
$sMenu=preg_replace("/\[{3,}/is","[[\\1",$sMenu);//匹配
}

//得到*****************************var sValue
$query1=mysql_query("select * from country where language_kind = '0' order by id asc");
while($data1=mysql_fetch_array($query1)){
$province_id=$data1[id];

$query2=mysql_query("select * from province where province_id='$province_id' order by province_id asc");
while($data2=mysql_fetch_array($query2)){
$nums=mysql_num_rows($query2);
$j++;
$sValue.="\"".$data2[id]."\",";
if($j==$nums){
$sValue="[".$sValue."],[";
$j=0;
}
}
}
$sValue.="]";
$sValue=str_replace("\",]","\"]",$sValue);
$sValue=str_replace(",[]","]",$sValue);
if((substr($sValue,0,2))=="[\""){
$sValue="[".$sValue;
}else{
$sValue=preg_replace("/\[{3,}/is","[[\\1",$sValue);//匹配
}

?>
<div id="tar"></div>
<SCRIPT LANGUAGE="JavaScript" DEFER>
var fMenu = <?php echo $fMenu; ?>;
var fValue = <?php echo $fValue; ?>;
var sMenu = <?php echo $sMenu; ?>;
var sValue = <?php echo $sValue; ?>;

var oWhere = document.all.tar;
var ofMenu = document.createElement("<SELECT name='bigclass'>");
var osMenu = document.createElement("<SELECT name='smallclass'>");
with(oWhere)appendChild(ofMenu),appendChild(osMenu);

createMainOptions();
createSubOptions(0);

ofMenu.onchange = function() {createSubOptions(this.selectedIndex);};

function createMainOptions() {
for(var i=0;i<fMenu.length;i++)ofMenu.options[i] = new Option(fMenu[i],fValue[i]);
}
function createSubOptions(j) {
with(osMenu) {
length=0;
for(var i=0;i<sMenu[j].length;i++)osMenu.options[i] = new Option(sMenu[j][i],sValue[j][i]);
}
}
</SCRIPT>
<?php
/*
调用方法:
将此代码保存为文件ld2.php
例如要在write.php页面放一个二级联动，则在write.php页面
要放置二级联动的地方加一句require_once("ld2.php");
若write.php要向save.php页面提交数据则在save.php中使用
＄bigclass=＄_POST["bigclass"];//取得大类的id值
＄smallclass=＄_POST["smallclass"];//取得小类的id值
接下来就知道该怎么做了吧……
附表的结构：
　可能有的表的结构和我有些不同，但基本点都一样，修改程序
中对应字段和表名就ok
程序写的有点乱，不过绝对可以放心的使用
欢迎与我交流探讨！
---------------------------------------------------------
大类的表news_bclass结构

CREATE TABLE news_bclass (
id int(11) NOT NULL auto_increment,
bname varchar(10) NOT NULL default '',
PRIMARY KEY (id),
UNIQUE KEY id_2 (id),
KEY id (id)
) TYPE=MyISAM;

字段说明：bname为大类中文名称
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－

小类的表news_sclass结构

CREATE TABLE news_sclass (
id int(11) NOT NULL auto_increment,
sname varchar(10) NOT NULL default '',
parentid int(10) NOT NULL default '0',
bname varchar(10) NOT NULL default '',
PRIMARY KEY (id),
UNIQUE KEY id_2 (id),
KEY id (id)
) TYPE=MyISAM;

字段说明：sname为小类中文名称
　　　　　parendid为大类中的id值
bname为大类中文名称


*/
?>

[wxcyz]

有
4級都有

[efanlx]

wxcyz(阿图），有三级的吗？