我在提交时有一个简单的表单，它将被重定向到submit.php，如果出现错误，它将在submit.php上显示错误消息。现在我想要的是，错误消息将显示回表单页面。
<html>
<head>
<? require_once('lib.php'); ?>
</head>
<body>
<form name="my-form" id="my-form" method="post" action="submit.php">
Your name:
<input name="name" value="" size="30" maxlength="255" />
Your email:
<input name="email" value="" size="30" maxlength="255" />
Your favourite color:
<select name="fav_color">
<option value="">-select please-</option>
<option value="Black">Black</option>
<option value="White">White</option>
<option value="Blue">Blue</option>
<option value="Red">Red</option>
<option value="Yellow">Yellow</option>
</select>
Your comment:
<textarea name="comment" rows="6" cols="35"></textarea>
<input type="submit" value="Submit" />
</form>
</body>
</html>
<?php
require_once('lib.php');
function getErrors($postData,$rules){
$errors = array();
// validate each existing input
foreach($postData as $name => $value){
//if rule not found, skip loop iteration
if(!isset($rules[$name])){
continue;
}
//convert special characters to HTML entities
$fieldName = htmlspecialchars($name);
$rule = $rules[$name];
//check required values
if(isset($rule['required']) && $rule['required'] && !$value){
$errors[] = 'Field '.$fieldName.' is required.';
}
//check field's minimum length
if(isset($rule['minlength']) && strlen($value) < $rule['minlength']){
$errors[] = $fieldName.' should be at least '.$rule['minlength'].' characters length.';
}
//verify email address
if(isset($rule['email']) && $rule['email'] && !filter_var($value,FILTER_VALIDATE_EMAIL)){
$errors[] = $fieldName.' must be valid email address.';
}
$rules[$name]['found'] = true;
}
//check for missing inputs
foreach($rules as $name => $values){
if(!isset($values['found']) && isset($values['required']) && $values['required']){
$errors[] = 'Field '.htmlspecialchars($name).' is required.';
}
}
return $errors;
}
$errors = getErrors($_POST,$validation_rules);
if(!count($errors)){
echo 'Your form has no errors.';
}
else{
echo '<strong>Errors found in form:</strong><ul><li>';
echo join('</li><li>',$errors);
echo '</li></ul><p>Correct your errors and try again.</p>';
}
?>
由于此php代码在同一页面上显示错误消息。我想在form.php page上显示错误消息。有人帮我这么做吗.
本文介绍了您的解决方案。
您应该创建一个验证器脚本（例如validate.php），并在那里提交表单进行验证。如果验证失败，验证器脚本应该返回一个验证错误数组（JSON、XML，无论您想要什么）。否则-返回重定向链接。
因此，当您在表单上单击"提交"时，应该向validator.php发出AJAX请求，而不是重定向。
你应该考虑使用一个框架来解决这些问题。这将节省大量的编码时间。
一个简单的解决方案是将您的注册页面作为表单操作，并用包装php代码
if(isset($_POST['submit'])){
//php code here
}
然后，您可以复制php代码并将其粘贴在html页面的开头。然后将表单操作设置为页面。
如果你想在处理PHP代码时隐藏部分表单，你可以这样做：：
echo '<style>.style1 {display: none }</style>";
或者您甚至可以在注册后以相同的形式向用户显示自定义消息：
echo '<div class="highlight"><p class="textcenter"><h5>You have successfully registered for blah blah blah.</h5></p><p>Thank you!</p><style>.style1 {display: none }</style>";
注意，我假设body标记的其余部分是具有类stlye1的样式。
这也确保了当用户提交表单时，只加载html页面中所需的文本，即可见文本。
正如Sergey Eremin所指出的，为这类任务考虑一个框架是很好的。
无论如何，以下是我在PHP中的操作方法。所有的代码都包含在一个页面（submit.php）中。因此，表单提交给自己。当用户打开submit.php时，会显示表单。当他们点击提交时，程序会检查是否提供了姓名、有效的电子邮件、喜欢的颜色和评论。如果没有一个是空的，并且电子邮件是有效的，程序会显示"一切正常"。否则，它会将用户重定向回表单，并指向未正确填写的字段。用户以前提供的每一个数据都通过重定向URL传递。使用$_GET，它会被检索并显示在表单中，因此用户不需要从头开始重新键入所有内容。
在插入数据库之前，请不要忘记清理/转义数据。
希望这能有所帮助。
<?php
//if the form has been submitted
if (isset($_POST['submit'])){
//extract data submitted through the form and assign date to variables
$name = $_POST['name'];
$email = $_POST['email'];
$favoriteColor = $_POST['fav_color'];
$comment = $_POST['comment'];
//pattern against which to check email validity
$good_email = "[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+'.[A-Za-z]{2,4}";
//if provided data is valid (email especially) and no form field has been left empty display "everything is okay"
if(strlen($name) > 0 && strlen($email) > 0 && preg_match("/$good_email/", $email, $regs) && strlen($favoriteColor) > 0 && strlen($comment) > 0){
echo "Everything is okay";
}
//otherwise redirect the user back to the form and indicate errors that they need to correct
else{
//build an error message string where the user is shown where the issue is
$error_message = "There are errors with your form."; //starting point for the error message
//if message has been left empty let the user know that the name is required
if(strlen($name) == 0){
$error_message .= "<br/>Name is required";
}
//if the email is left empty let the user know that an email is required
if(strlen($email) == 0){
$error_message .= "<br/>Email is required";
}
//if the email does not match the pattern ($good_email) let the user know that the email they have supplied is invalid
if(!(preg_match("/$good_email/", $email, $regs))){
$error_message .= "<br/>Email is not valid";
}
//if the a favorite color has not been selected let the user know that they need to select a favorite color
if(strlen($favoriteColor) == 0){
$error_message .= "<br/>Favorite color can not be left empty";
}
//if the comment is left empty let the user know that comment is required
if(strlen($comment) == 0){
$error_message .= "<br/>Comment is required";
}
//if any field is left empty or the email is invalid redirect the user back to the form along with the data they submitted
header("Location: submit.php?&submittedName=$name&error=$error_message&submittedEmail=$email&submittedColor=$favoriteColor&submittedComment=$comment");
}
}
//if no submission display the form
else{
?>
<html>
<head>
</head>
<body>
<?php
//display the error message
//error message is passed through the url
if (isset($_GET['error']))
{
echo "<p style='color:red'>".$_GET['error']."</a>";
}
?>
<form name="my-form" id="my-form" method="post" action="submit.php">
Your name:
<input name="name" value="<?php if($_GET['error']) { echo $_GET['submittedName'];} //if there's been an error with form submission display the name the user prevously submitted ?>" size="30" maxlength="255" />
Your email:
<input name="email" value="<?php if($_GET['error']) { echo $_GET['submittedEmail'];} //if there's been an error with form submission display the email the user prevously submitted ?>" size="30" maxlength="255" />
Your favorite color:
<select name="fav_color">
<option value="">-select please-</option>
<option value="Black">Black</option>
<option value="White">White</option>
<option value="Blue">Blue</option>
<option value="Red">Red</option>
<option value="Yellow">Yellow</option>
</select>
Your comment:
<textarea name="comment" rows="6" cols="35"><?php if($_GET['error']) { echo $_GET['submittedComment'];} //if there's been an error with form submission display the comment the user prevously submitted ?></textarea>
<input type="submit" value="Submit" name="submit"/>
</form>
</body>
</html>
<?php
}
?>