我正在建立一个允许用户编辑业务信息的网站。有 6 个选择，3 个用于类别，3 个用于子类别。我正在使用隐藏字段来获取每个类别和子类别之前的值，然后如果选择 isset，则插入选择/下拉列表的值。这是我的代码：对于 MYSQL 更新：
<?
include('../config.php');
if (isset($_GET['id']) ) {
$id = (int) $_GET['id'];
if (isset($_POST['submitted'])) {
foreach($_POST AS $key => $value) { $_POST[$key] = mysql_real_escape_string($value); }
if(isset($_REQUEST['cselect1'])){
$cselect1 = $_REQUEST['cselect1'];
$query="SELECT cat FROM cat WHERE id='$cselect1'";
$result = mysql_query ($query);
while($catselect=mysql_fetch_array($result)){
$catselect1 = $catselect['cat'];
}
} else {
$catselect1 = $_REQUEST['beforecat1'];
}
if(isset($_REQUEST['cselect2'])){
$cselect2 = $_REQUEST['cselect2'];
$query="SELECT cat FROM cat WHERE id='$cselect2'";
$result = mysql_query ($query);
while($catselect=mysql_fetch_array($result)){
$catselect2 = $catselect['cat'];
}
} else {
$catselect2 = $_REQUEST['beforecat2'];
}
if(isset($_REQUEST['cselect3'])){
$cselect1 = $_REQUEST['cselect3'];
$query="SELECT cat FROM cat WHERE id='$cselect3'";
$result = mysql_query ($query);
while($catselect=mysql_fetch_array($result)){
$catselect1 = $catselect['cat'];
}
} else {
$catselect3 = $_REQUEST['beforecat3'];
}
$sql = "UPDATE `company` SET `name` = '{$_POST['name']}' , `phone` = '{$_POST['phone']}' , `cat1` = '$catselect1' , `cat2` = '$catselect2' , `cat3` = '$cselect3' , `zipcode` = '{$_POST['zipcode']}' , `city` = '{$_POST['city']}' , `address` = '{$_POST['address']}' , `address2` = '{$_POST['address2']}' , `website` = '{$_POST['website']}' , `product1` = '{$_POST['product1']}' , `product2` = '{$_POST['product2']}' , `product3` = '{$_POST['product3']}' , `product4` = '{$_POST['product4']}' , `product5` = '{$_POST['product5']}' , `product6` = '{$_POST['product6']}' , `product7` = '{$_POST['product7']}' , `subcat1` = '{$_POST['sselect1']}' , `subcat2` = '{$_POST['sselect2']}' , `subcat3` = '{$_POST['sselect3']}' WHERE `id` = '$id' ";
mysql_query($sql) or die(mysql_error());
$sql = "UPDATE `company_secondary` SET `company_description` = '{$_POST['description']}' , `since` = '{$_POST['since']}' , `smoking` = '{$_POST['select3']}' , `delivery` = '{$_POST['select5']}' , `alcohol` = '{$_POST['select6']}' , `kids` = '{$_POST['select1']}' , `wheelchair` = '{$_POST['select2']}' , `twitter` = '{$_POST['twitter']}' , `facebook` = '{$_POST['facebook']}' , `youtube` = '{$_POST['youtube']}' , `premium` = '{$_POST['premium']}' , `creditcards` = '{$_POST['select4']}' , `outdoor` = '{$_POST['select7']}' , `featured` = '{$_POST['featured']}' , `shortdesc` = '{$_POST['shortdesc']}' WHERE company_id = '$id' ";
mysql_query($sql) or die(mysql_error());
echo "Edited Row<br/>";
echo "<a href='allbiz.php'>Back To Listing</a>";
}
$row = mysql_fetch_array ( mysql_query("SELECT * FROM `company` WHERE `id` = '$id' "));
?>
这是具有隐藏输入的表单（仅发布了其中的一部分，如果需要可以发布更多！）
<form action='' method='POST'>
<p><b>Name:</b><br /><input type='text' name='name' value='<?= $row['name'] ?>' />
<p><b>Phone:</b><br /><input type='text' name='phone' value='<?= stripslashes($row['phone']) ?>' />
<?php
$cat1 = stripslashes($row['cat1']);
$cat2 = stripslashes($row['cat2']);
$cat3 = stripslashes($row['cat3']);
$subcat1 = stripslashes($row['subcat1']);
$subcat2 = stripslashes($row['subcat2']);
$subcat3 = stripslashes($row['subcat3']);
?>
<input type='hidden' value='<?php echo $cat1;?> name='beforecat1'/>
<input type='hidden' value='<?php echo $cat2;?> name='beforecat2'/>
<input type='hidden' value='<?php echo $cat3;?> name='beforecat3'/>
<input type='hidden' value='<?php echo $subcat1;?> name='beforesubcat1'/>
<input type='hidden' value='<?php echo $subcat2;?> name='beforesubcat2'/>
<input type='hidden' value='<?php echo $subcat3;?> name='beforesubcat3'/>
<p><b>Cat1:</b><br />
<?php
$query="SELECT * FROM cat";
$result = mysql_query ($query);
echo"<select name='cselect1' id='cat1'><option value='0'>Please Select A Category</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value=\"".htmlspecialchars($catinfo['number'])."\">".$catinfo['cat']."</option>";
}
echo"</select>";
?>
<?php
$query="SELECT * FROM subcat";
$result = mysql_query ($query);
echo"<select name='sselect1' id='subcat1'><option value=''>Sub Category</option>";
echo $subcat1;
echo"'>$sucat1</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value='".htmlspecialchars($catinfo['subcat'])."' class='".$catinfo['catnumber']."'>".$catinfo['subcat']."</option>";
}
echo"</select>";
?>
<p><b>Cat2:</b><br />
<?php
$query="SELECT * FROM cat";
$result = mysql_query ($query);
echo"<select name='cselect2' id='cat2'><option value='0'>Please Select A Category</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value=\"".htmlspecialchars($catinfo['number'])."\">".$catinfo['cat']."</option>";
}
echo"</select>";
?>
<?php
$query="SELECT * FROM subcat";
$result = mysql_query ($query);
echo"<select name='sselect2' id='subcat2'><option value=''>Sub Category</option>";
echo $subcat1;
echo"'>$sucat1</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value='".htmlspecialchars($catinfo['subcat'])."' class='".$catinfo['catnumber']."'>".$catinfo['subcat']."</option>";
}
echo"</select>";
?>
<p><b>Cat3:</b><br />
<?php
$query="SELECT * FROM cat";
$result = mysql_query ($query);
echo"<select name='cselect3' id='cat3'><option value='0'>Please Select A Category</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value=\"".htmlspecialchars($catinfo['number'])."\">".$catinfo['cat']."</option>";
}
echo"</select>";
?>
<?php
$query="SELECT * FROM subcat";
$result = mysql_query ($query);
echo"<select name='sselect3' id='subcat3'><option value=''>Sub Category</option>";
// printing the list box select command
while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt
echo "<option value='".htmlspecialchars($catinfo['subcat'])."' class='".$catinfo['catnumber']."'>".$catinfo['subcat']."</option>";
}
echo"</select>";
?>
我的希望是，如果用户更改了 Cat 和 Subcat 选择/下拉菜单，那么它将在 mysql 查询中更新。否则，如果它们保持不变，那么从数据库中选择的隐藏输入将像以前一样在 mysql 表中更新。但是有些东西不起作用，当您提交表单而不触摸选择/下拉菜单时，猫和子猫就会被清除干净。我该如何解决？
感谢大家的帮助！