目前我创建了注册表单。问题是如果我错误地输入表单，它会在表单顶部和表单
中显示错误消息您可以在此处查看我的完整代码
<?php
include 'core/init.php';
logged_in_redirect();
include 'includes/overall/header.php' ;
//if form is being submitted
if(empty($_POST)=== false)
{
//to validate whether user enters smtg or not otherwise no point continue to do the next validation
//create an array
$required_fields = array ('username','password','password_again','first_name','email','passport','gender','contactno','address');
foreach($_POST as $key=>$value)
{
//if the key (value) in array of $required_fields is true which is empty
if(empty($value) && in_array ($key, $required_fields) === true )
{
$errors[] = 'Fields marked with an asterisk are compulsory!';
//the validation can happen to more than 1 field
break 1;
}
}
if(empty($errors) === true)
{
if(user_exists($_POST['username']) === true)
{
$errors[] = 'Sorry, the username \'' .$_POST['username'] . '\' is already taken.';
}
//search for the string, preg_match(search_pattern, your_string)
// \s = white space character
//if(preg_match("/\\s/", $_POST['username']) == true)
if(preg_match("/\s/", $_POST['username']) == true)
{
$errors[] = 'Your username must not contain space.';
}
if(strlen($_POST['password']) < 6)
{
$errors[] = 'Your password must be at least 6 characters';
}
if($_POST['password'] !== $_POST['password_again'])
{
$errors[] = 'Your passwords do not match at all';
}
if(filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) === false)
{
$errors[] = 'A valid email address is required';
}
if(email_exists($_POST['email']) === true)
{
$errors[] = 'Sorry, the email \'' . $_POST['email'] . '\' is already in use.';
}
if(preg_match("/\s/", $_POST['passport']) == true)
{
$errors[] = 'Your passport must not contain space!!.';
}
else if(preg_match("/\s/", $_POST['gender']) == true)
{
$errors[] = 'Your gender must not contain space.';
}
else if (!preg_match('/^[0-9]\d{9}$/', $_POST['contactno']))
{
$errors[] = 'Enter your contact number correctly!!.';
}
}
}
//what does this line does is that to check whether success is in the end of the URL
if(isset($_GET['success']) && empty($_GET['success']))
{
echo 'You have been registered successfully! You may login now';
}
else
{//if there are no errors
if (empty($_POST) === false && empty($errors) === true)
{
//create an array of $register_data for sanitizing purpose ,prevent SQL injection attactk
$register_data = array
(
'username' => $_POST['username'],
'password' => $_POST['password'],
'passport' => $_POST['passport'],
'first_name' => $_POST['first_name'],
'last_name' => $_POST['last_name'],
'gender' => $_POST['gender'],
'email' => $_POST['email'],
'contactno' => $_POST['contactno'],
'address' => $_POST['address']
);
register_user($register_data);
//redirect and bring success variable to register.php
header('Location: register.php?success');
exit();
}
//
else if (empty($errors) === false)
{
echo output_errors($errors);
}
?>
<form action="" method="post">
<ul>
<li>
Username*:<br>
<input type="text" name="username">
</li>
<li>
Password*:<br>
<input type="password" name="password">
</li>
<li>
Password again*:<br>
<input type="password" name="password_again">
</li>
<li>
<table width="200" border="0">
<tr>
<td width="157" scope="col">First name*: <br>
<input type="text" name="first_name"> </td>
<td width="439" scope="col">Last name: <br>
<input type="text" name="last_name"> </td>
</tr>
<tr>
<td><p>Gender*:
<select name="gender" id="gender">
<option value="">Select</option>
<option value="Male">Male</option>
<option value="Female">Female</option>
</select>
</p></td>
<td> </td>
</tr>
<tr>
<td>Passport: <br>
<input type="text" name="passport"></td>
<td> </td>
</tr>
<tr>
<td><p>Email*:<br>
<input type="text" name="email">
</p></td>
<td><p>Contact No*:<br>
<input type="text" name="contactno" id="contactno">
</p></td>
</tr>
<tr>
<td colspan="2"><p>Address*<br>
<input name="address" type="text" size="100">
</p></td>
</tr>
</table>
</li>
<li>
<input type="submit" value="Register">
</li>
</ul>
</form>
<?php
}
include 'includes/overall/footer.php' ; ?>
现在我想更改为显示弹出消息而不重置表单。
有没有解决办法？
答案 0 :(得分：1)
如果你给这样的表单输入标签会很好：
<input type="text" name="username" placeholder="Username" value="<?php echo $_POST['username']; ?>">
以及除密码以外的其他字段。
OR
<input type="text" name="username" placeholder="Username" value="<?php echo (isset($_POST['username'])?$_POST['username']:''); ?>">
如果出现某种错误并且您尚未验证表单，它会保留您的表单数据。
答案 1 :(得分：0)
PHP是服务器端处理语言。如果没有提交表单，就无法在客户端上处理PHP代码。
但是，您可以完成使用Javascript的操作，这将运行客户端，并且可以在用户提交表单之前弹出警报（或弹出窗口）以指示表单有什么问题。
这里有一些很棒的图书馆建议，以及一些很好的样本：Javascript form validation