PHP二级下拉菜单连动有关问题

PHP二级下拉菜单连动问题

本帖最后由 gdljw 于 2013-09-13 17:13:20 编辑 下边这段二级下拉菜单连动下拉，是读取数据库修改产品页时的代码，第一级下拉能读取一级分类数据，但第二级二拉只能再选过一次，要怎改为也可以自动获取二级分类呢？

<br />
<br />
<br />
<script language="javascript"><br />
var subcat2 = new Array();<br />
<?php<br />
require('config.php');<br />
$i=0;<br />
$sql="select * from p_cclass ";//查询所有小类<br />
$result=MySQL_query($sql);<br />
while($rs=mysql_fetch_array($result))<br />
{<br />
echo "subcat2[".$i++."] = new Array('".$rs["cc_id"]."','".$rs["cid_ccid"]."','".$rs["classname"]."');\n";<br />
}<br />
?><br />
function changeselect1(locationid)<br />
{<br />
document.myform.cc_id.length = 0;<br />
document.myform.cc_id.options[0] = new Option('暂无二级分类','');<br />
//alert(subcat2[1].toString());<br />
//alert(locationid.length.toString());<br />
for (i=0; i<subcat2.length; i++)<br />
{<br />
if (subcat2[i][1] == locationid)<br />
{<br />
document.myform.cc_id.options[document.myform.cc_id.length] = new Option(subcat2[i][2], subcat2[i][0]);}<br />
document.myform.cc_id.options[0] = new Option('==请选择二级分类==','');<br />
<br />
<br />
}<br />
}<br />
</script><br />
<br />
<br />
<form action="pro_edit.php" method="post" name="myform"  id="myform"  ><br />
  <table width="800" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#F1F5F8"><br />
<tr><br />
<td width="697" height="51"><table width="100%" height="175" border="0" cellpadding="0" cellspacing="0"><br />
<tr><br />
<td height="31" colspan="2" align="center" bgcolor="#D6E7F7">修改产品</td><br />
</tr><br />
<tr><br />
<td width="65" height="26"> 产品类型:</td><br />
<td width="632" height="26"><select name="c_id" id="c_id" onChange="changeselect1(this.value)"   style="width:100;border:1 solid #9a9999; font-size:9pt; background-color:#ffffff"><br />
<?php<br />
require("config.php"); //包含文件<br />
<br />
$p_id=$_GET["p_id"];<br />
$sqlp = "select * from product where p_id='$p_id'"; <br />
$rsp=mysql_query($sqlp); <br />
$rscountp=mysql_fetch_array($rsp);<br />
<br />
$c_id=$rscountp["p_cid"];<br />
$sql="select * from p_class where c_id='$c_id'";//查询表<br />
$rs=mysql_query($sql);<br />
$rscount=mysql_fetch_array($rs)<br />
<br />
?><br />
<option value="<?=$rscount["c_id"]?>"><?=$rscount["classname"]?></option><br />
<?php<br />
$sqln="select * from p_class where c_id!='$c_id'";//查询表<br />
$rsn=mysql_query($sqln);<br />
while($rscountn=mysql_fetch_array($rsn)){	<br />
?><br />
<option value="<?=$rscountn["c_id"]?>"><?=$rscountn["classname"]?></option><br />
<?php<br />
}<br />
?><br />
</select><br />
<br />
<br />
</select><br />
<select name="cc_id"  id="cc_id"  style="width:100;border:1 solid #9a9999; font-size:9pt; background-color:#ffffff"><br />
<br />
<?php<br />
<br />
$p_id=$_GET["p_id"];<br />
$sqla = "select * from product where p_id='$p_id'"; <br />
$rsa=mysql_query($sqla); <br />
$rscounta=mysql_fetch_array($rsa);<br />
<br />
<br />
$c_id=$rscounta["p_cid"];<br />
<br />
<br />
$sqlb = "select * from p_class where c_id='$c_id'"; <br />
$rsb=mysql_query($sqlb); <br />
$rscountb=mysql_fetch_array($rsb);<br />
<br />
<br />
$cid_ccid=$rscountb["c_id"];<br />
?><br />
<br />
<br />
<?php<br />
$sqlc = "select * from p_cclass where cid_ccid='$cid_ccid'"; //条件小分类<br />
$rsc=mysql_query($sqlc); <br />
$rscountc=mysql_fetch_array($rsc);<br />
?><br />
<option value="<?=$rscountc["cc_id"]?>"><?=$rscountc["classname"]?></option><br />
<br />
<br />
<?php<br />
$sqla="select * from p_cclass where cid_ccid='$cid_ccid'";//查询表<br />
$rsc=mysql_query($sqlc);<br />
while($rscountc=mysql_fetch_array($rsc)){	<br />
?><br />
<option value="<?=$rscountc["cc_id"]?>"><?=$rscountc["classname"]?></option><br />
<br />
<?php<br />
}<br />
?><br />
</select><br />
<br />
</label></td><br />
</tr><br />
<br />
<tr><br />
<td height="59" align="center"><input type="submit" name="Submit" value="确定提交"  onclick="return  Check();" /><br />
  <br />
<input  name="p_id" type="hidden" id="p_id" value="<?=$rscountp["p_id"]?>" /><br />
 <br />
<input type="reset" name="Submit2" value="重置" /><br />
<textarea name="p_content" id="p_content" style="display:none;"><br />
<?=$rscountp["p_content"]?><br />
<br />
</textarea></td><br />
</tr><br />
</table><br />
</form><br />
<br />

php 二级菜单

分享到：
------解决方案--------------------
再修改数据的时候你要根据产品的那个分类父ID读取该父ID的子类
然后循环
------解决方案--------------------