【发布时间】：2015-07-16 23:54:59
【问题描述】：
我正在尝试在先前创建的文本区域中显示从数据库中检索到的数据。代码应该获取用户昵称和输入消息，存储在数据库中并将其检索回文本区域，类似于一个人聊天（单击“发送消息”后键入的任何内容都应存储到数据库中并检索并显示在文本区域）。我能够存储到我的数据库中，并在文本区域之外的任何地方显示检索到的数据。任何帮助表示赞赏。谢谢！
代码：
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Untitled Document</title>
</head>
<body>
<form method="post" action="postmessage.php">
<center>
<br />
<label for="output">Chat history</label>
<br />
<textarea name="output" cols="100" rows="25" id="output"></textarea>
<br />
<label for="nickname" maxlength="16">Nickname</label>
<br />
<input type="text" name="nickname" id="nickname" />
<br />
<label for="message" >Type your message here:</label>
<br />
<input name="message" type="text" id="message" size="87" /><input type="submit" value="Send Message" />
</form>
<?php
$connection = mysql_connect('localhost', 'root', '');
mysql_select_db('messenger', $connection);
$query = mysql_query('select * from messages');
while ($entry = mysql_fetch_object($query))
{
printf("<p>%s <br />- <em>%s</em></p>",
htmlentities($entry->message),
htmlentities($entry->nickname)
);
}
?>
</body>
</html>
postmessage.php
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Untitled Document</title>
</head>
<?php
$nickname=$_POST['nickname'];
$message = $_POST['message'];
$nickname = mysql_real_escape_string($nickname);
$message = mysql_real_escape_string($message);
$connection = mysql_connect('localhost', 'root', '');
mysql_select_db('messenger', $connection);
if (!mysql_query(
"insert into messages (nickname, message) VALUES ('$nickname', '$message')"
)){
echo ("Could not process your send request");
};
?>
<body>
</body>
</html>
更新：
<?php
session_start();
?>
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Untitled Document</title>
</head>
<body>
<form method="post" action="postmessage1.php">
<div style="text-align: center;">
<br />
<label for="output">Chat history</label>
<br />
<textarea name="output" cols="100" rows="25" id="output"><?php if(isset($_SESSION['currentChat'])){ echo $_SESSION['currentChat']; }?></textarea>
<br />
<label for="nickname" maxlength="16">Nickname</label>
<br />
<input type="text" name="nickname" id="nickname" />
<br />
<label for="message" >Type your message here:</label>
<br />
<input name="message" type="text" id="message" size="87" /><input type="submit" value="Send Message" />
</div>
</form>
</body>
</html>
post..php：
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Untitled Document</title>
</head>
<body>
<?php
session_start();
$nickname = isset($_POST['nickname'])?$_POST['nickname']:"";
$message = isset($_POST['message'])?$_POST['message']:"";
if(empty($nickname) || empty($message)){
// no data return to form
header("location: chatform.php");
}
$mysqli = new mysqli("localhost", "root", "", "messenger");
/* create a prepared statement */
if ($stmt = $mysqli->prepare("INSERT INTO messages (nickname, message) VALUES (?, ?)")) {
/* bind parameters for markers */
$stmt->bind_param("ss", $nickname, $message);
/* execute query */
$stmt->execute();
/* close statement */
$stmt->close();
}
/* close connection */
$mysqli->close();
// Update Session
$_SESSION['nickname'] .= htmlentities($nickname);
$_SESSION['currentChat'] .= htmlentities($message);
// Redirect back to display content
header("Location: chatform.php");
?>
</body>
</html>
【问题讨论】：
-
你能把代码贴在你想在 textarea 中显示的地方吗？
-
欢迎来到 Stack Overflow。你会因为使用 MySQL 而受到攻击。它已被弃用，不应使用，建议使用 MySQLi 或 PDO。
-
你的文本区域在哪里，最后我看到它看起来像这样
<textarea name="textarea"></textarea>
标签： php