您不能从 PHP（运行服务器端）执行 Javascript 函数（客户端）。
此外，您需要使用用户名和密码连接到数据库服务器，并选择一个数据库。不要使用@，它只会阻止你看到错误——但错误会在那里。
在 PHP 文件中，您需要检查是否收到$_POST['page'].，如果收到，请将其用作SELECT. 您已经设置了一个名为“页面”的组合，因此在提交时 PHP 脚本会将所选值接收到一个名为$_POST['page'].
通常的警告适用：
- 不鼓励使用 mysql_* 函数，请使用 mysqli 或 PDO
- 如果您仍然使用 mysql_*，请清理输入（例如
$id = (int)$_POST['page']，如果它是数字，或者mysql_real_escape_string不是，如您的情况）
如果您想在用户更改组合框时更改textarea 的内容，这适用于 AJAX（例如 jQuery）：
- 将函数绑定到组合框的更改事件
- 向传递新 ID 的 PHP 脚本服务器端发出调用
- PHP 脚本将只输出内容，不输出其他 HTML
- 接收combo的change-function中的内容并验证成功
- 设置
$('#textarea')内容的值
这样您就不必在每次组合更改时重新加载页面。这让我想起了另一件事，当你现在重新加载页面时，你必须正确设置组合值：你也可以利用它来动态生成组合。
工作示例
该文件应称为“editpages.php”。PHP 细化（几乎）与数据表示分开完成。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>PDIMI - The Personal Development and Internet Marketing Institution</title>
<link href='http://fonts.googleapis.com/css?family=Oswald:400,300' rel='stylesheet' type='text/css' />
<link href='http://fonts.googleapis.com/css?family=Abel' rel='stylesheet' type='text/css' />
<link href="../style/default.css" rel="stylesheet" type="text/css" media="all" />
<!--[if IE 6]>
<link href="default_ie6.css" rel="stylesheet" type="text/css" />
<![endif]-->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script language="JavaScript" type="text/javascript">
function getData(combobox){
var value = combobox.options[combobox.selectedIndex].value;
// TODO: check whether the textarea content has been modified.
// if so, warn the user that continuing will lose those changes and
// reload a new page, and abort function if so instructed.
document.location.href = '?page='+value;
}
</script>
</head>
<?php include 'aheader.php';?>
<?php
error_reporting(E_ALL);
if (!mysql_ping())
die ("The MySQL connection is not active.");
mysql_set_charset('utf8');
// $_REQUEST is both _GET and _POST
if (isset($_REQUEST['page']))
$page = mysql_real_escape_string($_REQUEST['page']);
else
$page = False;
$query = "SELECT pageid, pagename FROM pages;";
$exec = mysql_query($query); // You need to be already connected to a DB
if (!$exec)
trigger_error("Cannot fetch data from pages table: " . mysql_error(), E_USER_ERROR);
if (0 == mysql_num_rows($exec))
trigger_error("There are no pages in the 'pages' table. Cannot continue: it would not work. Insert some pageids and retry.",
E_USER_ERROR);
$options = '';
while($row = mysql_fetch_array($exec))
{
// if the current pageid matches the one requested, we set SELECTED
if ($row['pageid'] === $page)
$sel = 'selected="selected"';
else
{
// If there is no selection, we use the first combo value as default
if (False === $page)
$page = $row['pageid'];
$sel = '';
}
$options .= "<option value=\"{$row['pageid']}\" $sel>{$row['pagename']}</option>";
}
mysql_free_result($exec);
if (isset($_POST['page_data']))
{
$page_data = mysql_real_escape_string($_POST['page_data']);
$query = "INSERT INTO pages ( pageid, content ) VALUES ( '{$page}', '{$page_data}' ) ON DUPLICATE KEY UPDATE content=VALUES(content);";
if (!mysql_query($query))
trigger_error("An error occurred: " . mysql_error(), E_USER_ERROR);
}
// Anyway, recover its contents (maybe updated)
$query = "SELECT content FROM pages WHERE pageid='{$page}';";
$exec = mysql_query($query);
// who says we found anything? Maybe this id does not even exist.
if (mysql_num_rows($exec) > 0)
{
// if it does, we're inside a textarea and we directly output the text
$row = mysql_fetch_array($exec);
$textarea = $row['content'];
}
else
$textarea = '';
mysql_free_result($exec);
?>
<body>
<div id="page-wrapper">
<div id="page">
<div id="content2">
<h2>Edit Your Pages Here</h2>
<script type="text/javascript" src="../ckeditor/ckeditor.js"></script>
<form name="editpage" method="POST" action="">
<table border="1" width="100%">
<tr>
<td>Please Select The Page You Wish To Edit:</td>
<td>
<select name="page" onChange="getData(this)"><?php print $options; ?></select>
</td>
</tr>
<tr>
<td><textarea class="ckeditor" name="page_data" cols="80" row="8" id="page_data"><?php print $textarea; ?></textarea></td>
</tr>
<tr>
<td><input type="Submit" value="Save the page"/></td>
</tr>
</table>
</form>
</div>
</div>
</div>
</body>
</html>