我想使用php验证表单，然后将输入保存在json文件中。我使用span类将错误消息从writer.php回显到html。但它并没有回显html中的错误文本，而是引用了带有空白页面的writer.php。
<head>
<title>Data Buku</title>
<link rel="stylesheet" type="text/css" href="style.css">
<link href='http://fonts.googleapis.com/css?family=Ribeye+Marrow' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Comfortaa' rel='stylesheet' type='text/css'>
</head>
<body>
<div class="center">
<h1>Data Buku</h1>
<p><span class="error">* required field.</span></p>
<hr>
<form action="writer.php" method="post">
<span class="error"><?php echo $error;?></span>
<h2>Informasi Pengarang</h2>
Nama: <br><input type="text" name="nama" id="nama" />
<span class="error">* <?php echo $namaErr;?></span><br>
Nomor Telepon: <br><input type="text" name="telepon" id="telepon" />
<span class="error">* <?php echo $nomorErr;?></span><br>
e-Mail: <br><input type="email" name="email" id="email" />
<span class="error">* <?php echo $emailErr;?></span><br>
<h2>Tulisan</h2>
Judul: <br><input type="text" name="judul" id="judul" />
<span class="error">* <?php echo $judulErr;?></span><br>
Konten: <br><textarea name = "konten" rows="6" cols="50" id="konten"></textarea>
<span class="error">* <?php echo $kontenErr;?></span><br>
<input type="submit" id="submit" name = submit value="Create" />
<input type="reset" id="reset" value="Reset" />
</form>
</div>
</body>
这是我的php文件
<?php
// Append new form data in json string saved in json file
// path and name of the file
$filetxt = 'dataInJson.json';
// error message
$namaErr = "";
$nomorErr = "";
$emailErr = "";
$judulErr = "";
$kontenErr = "";
// check if all form data are submited, else output error message
if(isset($_POST['submit'])) {
// if form fields are empty, outputs message, else, gets their data
if(empty($_POST['nama'])) {
$namaErr = "Write your name";
}
if(empty($_POST['telepon'])){
$nomorErr = "Write the phone number";
}
if(empty($_POST['email'])){
$emailErr = "Write the email";
}
if(empty($_POST['judul'])){
$judulErr = "Write the title";
}
if(empty($_POST['konten'])) {
$kontenErr = "Write the content";
}
else {
// gets and adds form data into an array
$data = array(
'nama'=> $_POST['nama'],
'telepon'=> $_POST['telepon'],
'email'=> $_POST['email'],
'judul'=> $_POST['judul'],
'konten'=> $_POST['konten'],
);
// path and name of the file
$filetxt = 'dataInJson.json';
$arr_data = array(); // to store all form data
// check if the file exists
if(file_exists($filetxt)) {
// gets json-data from file
$jsondata = file_get_contents($filetxt);
// converts json string into array
$arr_data = json_decode($jsondata, true);
}
// appends the array with new form data
$arr_data[] = $data;
// encodes the array into a string in JSON format (JSON_PRETTY_PRINT - uses whitespace in json-string, for human readable)
$jsondata = json_encode($arr_data, JSON_PRETTY_PRINT);
// saves the json string in "dataInJson.json"
// outputs error message if data cannot be saved
if(file_put_contents('dataInJson.json', $jsondata)){
echo '<script type="text/javascript">alert("Data has been submitted");</script>';
}
else{
echo 'Tidak dapat menyimpan data di "dataInJson.json"';
}
}
}
else echo 'Form fields not submited';
?>
除非你做了AJAX解决方案，否则你需要将页面提交给自己，所以这一切都必须在一个页面上：
<?php
error_reporting(E_ALL);
class ValidateInfo
{
public $errors;
public $message;
public $data;
public function Check($payload = array(),$type = "error",$mess = "unknown",$validate = array())
{
$trimmed = trim($payload[$type]);
if(!empty($validate)) {
// Strip out everything but numbers and letters and a couple of symbols.
if(in_array('digits',$validate) && in_array('letters',$validate)) {
$this->data[$type] = preg_replace('/[^0-9a-zA-Z's'-'_]/','',$trimmed);
}
// Strip out all but numbers
elseif(in_array('digits',$validate)) {
$this->data[$type] = preg_replace('/[^0-9]/','',$trimmed);
}
// Strip out letters
elseif(in_array('letters',$validate)) {
$this->data[$type] = preg_replace('/[^a-zA-Z's'-'_]/','',$trimmed);
}
// Re-assign data type to consolidate
$this->data[$type] = (!isset($this->data[$type]))? $trimmed:$this->data[$type];
// Check if data is an email
if(in_array('email',$validate)) {
$this->data[$type] = (filter_var($this->data[$type], FILTER_VALIDATE_EMAIL))? $this->data[$type]:'';
}
// Strip out html tags
if(in_array('strip',$validate)) {
$this->data[$type] = strip_tags($this->data[$type]);
}
}
if(!isset($this->data[$type]))
$this->data[$type] = $trimmed;
$this->errors[$type] = (empty($this->data[$type]))? 1:0;
$this->message[$type] = $mess;
}
}
// Creat instance of info processor
$info = new ValidateInfo();
// check if all form data are submited, else output error message
if(isset($_POST['submit'])) {
// Checks empty fields
$info->Check($_POST,'nama','Write your name',array('letters','digits'));
$info->Check($_POST,'telepon','Write the phone number',array('digits'));
$info->Check($_POST,'email','Write the email',array('email'));
$info->Check($_POST,'judul','Write the title',array('letters','digits'));
$info->Check($_POST,'konten','Write the content', array('letters','digits','strip'));
if(array_sum($info->errors) == 0) {
// path and name of the file
$filetxt = 'dataInJson.json';
// Assign stored data
$data = $info->data;
// path and name of the file
$filetxt = 'dataInJson.json';
// to store all form data
$arr_data = array();
// check if the file exists
if(file_exists($filetxt)) {
// gets json-data from file
$jsondata = file_get_contents($filetxt);
// converts json string into array
$arr_data = json_decode($jsondata, true);
// appends the array with new form data
$arr_data[] = $data;
// encodes the array into a string in JSON format (JSON_PRETTY_PRINT - uses whitespace in json-string, for human readable)
$jsondata = json_encode($arr_data, JSON_PRETTY_PRINT);
// saves the json string in "dataInJson.json"
// outputs error message if data cannot be saved
if(file_put_contents('dataInJson.json', $jsondata)) {
$info->errors['success'] = true; ?>
<script type="text/javascript">
alert("Data has been submitted");
</script>
<?php }
else {
$info->message['general']['put_file'] = 'Tidak dapat menyimpan data di "dataInJson.json"';
}
}
else {
$info->message['general']['bad_file'] = 'No file exists';
}
}
}
else
$info->message['general']['submit'] = 'Form fields not submited'; ?>
<head>
<title>Data Buku</title>
<link rel="stylesheet" type="text/css" href="style.css">
<link href='http://fonts.googleapis.com/css?family=Ribeye+Marrow' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Comfortaa' rel='stylesheet' type='text/css'>
</head>
<style>
.error { color: red; clear: left; float: left; display: inline-block; width: 100%; font-size: 12px; }
input,
textarea { float: left; clear: left; display: inline-block; font-size: 20px; color: #333; padding: 10px; }
label { font-family: Arial, Helvetica, sans-serif; font-size: 14px; color: #888; float: left; clear: left; display: inline-block; }
div.roadie { width: 500px; border-bottom: 1px solid #CCC; display: inline-block; float: left; clear: both; padding: 10px; }
</style>
<body>
<div class="center">
<h1>Data Buku</h1>
<?php if(isset($info->errors['success'])) { ?>
<h2>Thank you!</h2>
<?php } else { ?>
<p><span class="error">* required field.</span></p>
<?php } ?>
<hr>
<form action="" method="post">
<?php if(isset($info->message['general'])) {
foreach($info->message['general'] as $_error) { ?>
<span class="error">* <?php echo $_error; ?></span><br>
<?php
}
} ?>
<h2>Informasi Pengarang</h2>
<div class="roadie">
<label for="nama">Nama:</label>
<input type="text" name="nama" id="nama"<?php if(isset($info->data['nama'])) { ?> value="<?php echo strip_tags($info->data['nama']); ?>" /><?php } ?>
<?php if(isset($info->errors['nama']) && $info->errors['nama'] == 1) { ?><span class="error">* <?php echo $info->message['nama']; ?></span><?php } ?>
</div>
<div class="roadie">
<label for="telepon">Nomor Telepon:</label>
<input type="text" name="telepon" id="telepon"<?php if(isset($info->data['telepon'])) { ?> value="<?php echo strip_tags($info->data['telepon']); ?>"<?php } ?> />
<?php if(isset($info->errors['telepon']) && $info->errors['telepon'] == 1) { ?><span class="error">* <?php echo $info->message['telepon']; ?></span><?php } ?>
</div>
<div class="roadie">
<label for="email">e-Mail:</label>
<input type="email" name="email" id="email"<?php if(isset($info->data['email'])) { ?> value="<?php echo strip_tags($info->data['email']); ?>"<?php } ?> />
<?php if(isset($info->errors['email']) && $info->errors['email'] == 1) { ?><span class="error">* <?php echo $info->message['email']; ?></span><br><?php } ?>
</div>
<div class="roadie">
<h2>Tulisan</h2>
<label for="judul">Judul:</label>
<input type="text" name="judul" id="judul"<?php if(isset($info->data['judul'])) { ?> value="<?php echo strip_tags($info->data['judul']); ?>"<?php } ?> />
<?php if(isset($info->errors['judul']) && $info->errors['judul'] == 1) { ?><span class="error">* <?php echo $info->message['judul']; ?></span><?php } ?>
</div>
<div class="roadie">
<label for="konten">Konten:</label>
<textarea name = "konten" rows="6" cols="50" id="konten"><?php if(isset($info->data['konten'])) { echo strip_tags($info->data['konten']); } ?></textarea>
<?php if(isset($info->errors['konten']) && $info->errors['konten'] == 1) { ?><span class="error">* <?php echo $info->message['konten']; ?></span><br><?php } ?>
</div>
<input type="submit" id="submit" name = submit value="Create" />
<input type="reset" id="reset" value="Reset" />
</form>
</div>
</body>
您的if/else语句是错误的。您的else仅在以下情况下执行！空（$_POST['konten']）。我建议您，将错误拉到一个数组中，存储在重定向用户的会话中（如果脚本在不同的文件中），并显示错误数组的内容。如果您在逻辑方面有问题，请在此处查看此问题-提交的PHP表单验证