php mysql填充几个动态下拉列表
我正在创建3个下拉列表，它们基于彼此的选择，因此第一个选择是正常的，但第二个选择取决于第一个选择，第三个选择取决于第二个选择这是表结构 类别子类别和子类别 这是密码php mysql填充几个动态下拉列表,php,mysql,drop-down-menu,Php,Mysql,Drop Down Menu,我正在创建3个下拉列表，它们基于彼此的选择，因此第一个选择是正常的，但第二个选择取决于第一个选择，第三个选择取决于第二个选择这是表结构 类别子类别和子类别 这是密码 只有一个可能是您的服务器中禁用了PHP短标记。因此，如果您正在为PHP使用短标记，它将不起作用 查看此链接了解如何在PHP中启用短标记 但是如果不能启用短标记，则需要正确打开PHP标记 plus2net中三个多重下拉列表框的演示 函数重载（表单） { var val=form.cat.options[form.cat.option
只有一个
可能是您的服务器中禁用了PHP短标记。因此，如果您正在为PHP使用短标记，它将不起作用
查看此链接了解如何在PHP中启用短标记
但是如果不能启用短标记，则需要正确打开PHP标记
plus2net中三个多重下拉列表框的演示
函数重载（表单）
{
var val=form.cat.options[form.cat.options.selectedIndex].value；
self.location='dd3.php？cat='+val；
}
函数重载3（表单）
{
var val=form.cat.options[form.cat.options.selectedIndex].value；
var val2=form.subcat.options[form.subcat.options.selectedIndex].value；
self.location='dd3.php？cat='+val+'&cat3='+val2；
}
您的PHP代码出现了一些问题。。。正确显示它。上面的代码与我写的一样，但第二个代码不是php代码，而是我尝试运行代码时在浏览器上的输出。您确定有正确的
<?php
require "config.php"; // Database details
?>
<!doctype html public "-//w3c//dtd html 3.2//en">
<html>
<head>
<title>Demo of Three Multiple drop down list box from plus2net</title>
<meta name="GENERATOR" content="Arachnophilia 4.0">
<meta name="FORMATTER" content="Arachnophilia 4.0">
<SCRIPT language=JavaScript>
function reload(form)
{
var val=form.cat.options[form.cat.options.selectedIndex].value;
self.location='dd3.php?cat=' + val ;
}
function reload3(form)
{
var val=form.cat.options[form.cat.options.selectedIndex].value;
var val2=form.subcat.options[form.subcat.options.selectedIndex].value;
self.location='dd3.php?cat=' + val + '&cat3=' + val2 ;
}
</script>
</head>
<body>
<?
$quer2=mysql_query("SELECT DISTINCT category,cat_id FROM category order by category");
$cat=$_GET['cat'];
if(isset($cat) and strlen($cat) > 0){
$quer=mysql_query("SELECT DISTINCT subcategory,subcat_id FROM subcategory where cat_id=$cat order by subcategory");
}else{$quer=mysql_query("SELECT DISTINCT subcategory,subcat_id FROM subcategory order by subcategory"); }
$cat3=$_GET['cat3'];
if(isset($cat3) and strlen($cat3) > 0){
$quer3=mysql_query("SELECT DISTINCT subcat2 FROM subcategory2 where subcat_id=$cat3 order by subcat2");
}else{$quer3=mysql_query("SELECT DISTINCT subcat2 FROM subcategory2 order by subcat2"); }
echo "<form method=post name=f1 action='dd3ck.php'>";
echo "<select name='cat' onchange=\"reload(this.form)\"><option value=''>Select one</option>";
while($noticia2 = mysql_fetch_array($quer2)) {
if($noticia2['cat_id']==@$cat){echo "<option selected value='$noticia2[cat_id]'>$noticia2[category]</option>"."<BR>";}
else{echo "<option value='$noticia2[cat_id]'>$noticia2[category]</option>";}
}
echo "</select>";
echo "<select name='subcat' onchange=\"reload3(this.form)\"><option value=''>Select one</option>";
while($noticia = mysql_fetch_array($quer)) {
if($noticia['subcat_id']==@$cat3){echo "<option selected value='$noticia[subcat_id]'>$noticia[subcategory]</option>"."<BR>";}
else{echo "<option value='$noticia[subcat_id]'>$noticia[subcategory]</option>";}
}
echo "</select>";
echo "<select name='subcat3' ><option value=''>Select one</option>";
while($noticia = mysql_fetch_array($quer3)) {
echo "<option value='$noticia[subcat2]'>$noticia[subcat2]</option>";
}
echo "</select>";
echo "<input type=submit value='Submit the form data'></form>";
?>
</body>
</html>
0){ $quer=mysql_query("SELECT DISTINCT subcategory,subcat_id FROM subcategory where cat_id=$cat order by subcategory"); }else{$quer=mysql_query("SELECT DISTINCT subcategory,subcat_id FROM subcategory order by subcategory"); } $cat3=$_GET['cat3']; if(isset($cat3) and strlen($cat3) > 0){ $quer3=mysql_query("SELECT DISTINCT subcat2 FROM subcategory2 where subcat_id=$cat3 order by subcat2"); }else{$quer3=mysql_query("SELECT DISTINCT subcat2 FROM subcategory2 order by subcat2"); } echo "
"; echo ""; echo ""; echo ""; echo "
"; ?>
<?php
require "config.php"; // Database details
?>
<!doctype html public "-//w3c//dtd html 3.2//en">
<html>
<head>
<title>Demo of Three Multiple drop down list box from plus2net</title>
<meta name="GENERATOR" content="Arachnophilia 4.0">
<meta name="FORMATTER" content="Arachnophilia 4.0">
<SCRIPT language=JavaScript>
function reload(form)
{
var val=form.cat.options[form.cat.options.selectedIndex].value;
self.location='dd3.php?cat=' + val ;
}
function reload3(form)
{
var val=form.cat.options[form.cat.options.selectedIndex].value;
var val2=form.subcat.options[form.subcat.options.selectedIndex].value;
self.location='dd3.php?cat=' + val + '&cat3=' + val2 ;
}
</script>
</head>
<body>
<?php
$quer2=mysql_query("SELECT DISTINCT category,cat_id FROM category order by category");
$cat=$_GET['cat'];
if(isset($cat) and strlen($cat) > 0){
$quer=mysql_query("SELECT DISTINCT subcategory,subcat_id FROM subcategory where cat_id=$cat order by subcategory");
}else{$quer=mysql_query("SELECT DISTINCT subcategory,subcat_id FROM subcategory order by subcategory"); }
$cat3=$_GET['cat3'];
if(isset($cat3) and strlen($cat3) > 0){
$quer3=mysql_query("SELECT DISTINCT subcat2 FROM subcategory2 where subcat_id=$cat3 order by subcat2");
}else{$quer3=mysql_query("SELECT DISTINCT subcat2 FROM subcategory2 order by subcat2"); }
echo "<form method=post name=f1 action='dd3ck.php'>";
echo "<select name='cat' onchange=\"reload(this.form)\"><option value=''>Select one</option>";
while($noticia2 = mysql_fetch_array($quer2)) {
if($noticia2['cat_id']==@$cat){echo "<option selected value='$noticia2[cat_id]'>$noticia2[category]</option>"."<BR>";}
else{echo "<option value='$noticia2[cat_id]'>$noticia2[category]</option>";}
}
echo "</select>";
echo "<select name='subcat' onchange=\"reload3(this.form)\"><option value=''>Select one</option>";
while($noticia = mysql_fetch_array($quer)) {
if($noticia['subcat_id']==@$cat3){echo "<option selected value='$noticia[subcat_id]'>$noticia[subcategory]</option>"."<BR>";}
else{echo "<option value='$noticia[subcat_id]'>$noticia[subcategory]</option>";}
}
echo "</select>";
echo "<select name='subcat3' ><option value=''>Select one</option>";
while($noticia = mysql_fetch_array($quer3)) {
echo "<option value='$noticia[subcat2]'>$noticia[subcat2]</option>";
}
echo "</select>";
echo "<input type=submit value='Submit the form data'></form>";
?>
</body>
</html>