我需要使用数据库和空字段验证表单。我制作了一个带有空字段过滤器的表单,因此如果用户跳过填写字段,它将被重定向回来,用户只需在之前输入一个空字段。我需要检查数据库是否已经存在,如果不存在,用户必须填写所有字段。
这是代码
<?php
session_start();
if(isset($_SESSION['error']))
{
$error = $_SESSION['error'];
$_POST = $_SESSION['post'];
unset($_SESSION['error']);
unset($_SESSION['post']);
}
?>
<head>
<script type="text/javascript" src="jquery-1.5.1.min.js"></script>
<script type="text/javascript" src="jquery-ui-1.8.11.custom.min.js"></script>
<link rel="stylesheet" type="text/css" href="jquery-ui-1.8.11.custom.css">
<script type="text/javascript">
$(document).ready(function()
{
$("#date").datepicker(
{
dateFormat: "dd-mm-yy",
changeMonth: true,
changeYear: true,
yearRange: "-0:+100"
});
});
</script>
</head>
<form name="form" method="post" action="process.php">
<table>
<tr>
<td>Name:</td>
<td>
<input name="name" id="name" type="text" value="<?php echo isset($_POST['name']) ? $_POST['name'] : '';?>"/>
<div style="color:red"><?php echo isset($error['name']) ? $error['name'] : '';?></div>
</td>
</tr>
<tr>
<td>Phone:</td>
<td>
<input name="phone" id="phone" type="text" value="<?php echo isset($_POST['phone']) ? $_POST['phone'] : '';?>"/>
<div style="color:red"><?php echo isset($error['phone']) ? $error['phone'] : '';?></div>
</td>
</tr>
<tr>
<td>Date:</td>
<td>
<input name="date" id="date" type="text" value="<?php echo isset($_POST['date']) ? $_POST['date'] : '';?>"/>
<div style="color:red"><?php echo isset($error['date']) ? $error['date'] : '';?></div>
</td>
</tr>
<tr>
<td>Time:</td>
<td>
<input name="time" id="time" type="text" value="<?php echo isset($_POST['time']) ? $_POST['time'] : '';?>"/>
<div style="color:red"><?php echo isset($error['time']) ? $error['time'] : '';?></div>
</td>
</tr>
<tr>
<td>
<input name="submit" id="submit" type="Submit" value="Submit" />
</td>
</tr>
</table>
</form>
这是php进程文件
<?php
session_start();
if($_POST)
{
$name = $_POST['name'];
$phone = $_POST['phone'];
$date = $_POST['date'];
$time = $_POST['time'];
$error = array();
if(empty($name)){
$error['name'] = 'Name must be filled';
}
if(empty($phone)){
$error['phone'] = 'Phone Number must be filled';
}
if(empty($date)){
$error['date'] = 'Date must be filled';
}
if(empty($time)){
$error['time'] = 'Time must be filled';
}
if(empty($error))
{
$check = mysql_query("SELECT * FROM event WHERE event='$time' AND date='$date'");
$in = mysql_num_rows($check);
if($in > 0)
{
$error['date'] = 'Select other date';
echo '<script type="text/javascript">';
echo 'alert("Sorry, it is already filled\n Please select the other date");';
echo 'window.location.href="cal.php";';
echo '</script>';
}
else
{
//insert into database
}
}else
{
$_SESSION['error'] = $error;
$_SESSION['post'] = $_POST;
header("location: cal.php");
}
}