经过一番努力和在线阅读后,我仍然找不到这个问题的答案。在我的应用程序中,表单通过 AJAX 发送,然后在 PHP 中进行验证并添加到数据库中。但是,我可以发送成功消息,但我不知道如何向用户发送友好的错误消息。
下面是我的JS:
$(document).ready(function(){
var form = $('form');
var submit = $('#submit');
form.on('submit', function(e) {
e.preventDefault();
$.ajax({
url: 'ajax_comment.php',
type: 'POST',
cache: false,
data: form.serialize(),
beforeSend: function(){
submit.val('Posting...').attr('disabled', 'disabled');
},
success: function(data){
var item = $(data).hide().fadeIn(800);
$('.new-comment').append(item);
form.trigger('reset');
submit.val('Submit Comment').removeAttr('disabled');
},
error: function(e){
alert(e);
}
});
});
});
我对 AJAX 的经验很少,所以请简单地告诉我!错误消息将类似于“用户名不存在”等,因此我认为我无法通过客户端验证来做到这一点。提前致谢!
<小时/>编辑: 下面是我正在使用的 PHP 代码。
<?php
// Include files
include 'config.php';
// Variables
$order_id = $_POST['order_id'];
$comment = $_POST['comment'];
$reviewed = 1;
$date = date('dS F Y');
// Find order ID match
$stmt = $con->prepare("SELECT order_id FROM transactions WHERE order_id = ?");
$stmt->bind_param('i', $order_id);
$stmt->execute();
$stmt->store_result();
$no_id_match = $stmt->num_rows;
$stmt->close();
// Check if review has already been submitted
$stmt = $con->prepare("SELECT order_id FROM transactions WHERE order_id = ? AND review = 1");
$stmt->bind_param('i', $order_id);
$stmt->execute();
$stmt->store_result();
$num_rows_reviewed = $stmt->num_rows;
$stmt->close();
if(empty($order_id) === true || empty($comment) === true) {
exit();
} else if($num_rows_reviewed> 0) {
exit();
} elseif($no_id_match == 0) {
exit();
} elseif(strlen($comment) > 499) {
exit();
} else {
//Insert review into DB
$stmt = $con->prepare("INSERT INTO reviews (order_id, comment, date) VALUES (?, ?, ?)");
$stmt->bind_param('iss', $order_id, $comment, $date);
$stmt->execute();
$stmt->close();
// Update transactions to show review added
$stmt = $con->prepare("UPDATE transactions SET review = ? WHERE order_id = ?");
$stmt->bind_param('ii', $reviewed, $order_id);
$stmt->execute();
$stmt->close();
// Get name from order ID
$stmt = $con->prepare("SELECT first_name, last_name FROM transactions WHERE order_id = ?");
$stmt->bind_param('i', $order_id);
$stmt->execute();
$stmt->bind_result($first_name, $last_name);
$stmt->fetch();
$stmt->close();
$name = $first_name. ' '. mb_substr($last_name, 0, 1);
// Output review live to page ?>
<div class="comment-item">
<div class="comment-post">
<h3><?php echo $name; ?>: <span><?php echo $date; ?></span></h3>
<p><?php echo $comment; ?></p>
</div>
</div><?php
}?>
目前,exit()
变量是我想要验证脚本的地方。但是,由于我现在不知道如何执行此操作,因此我只是退出脚本。
最佳答案
您可以通过HTTP方式从后端发送错误。
如果一切正常,请发送一个以 json 编码的 PHP 数组。
$result = [];
$result['error'] = false;
$result['code'] = "OK"; //better with constant
$result['msg'] = "";
echo json_encode($result);
如果有些东西不起作用,就像这样。
header('HTTP/1.1 500 Internal Server Error');
$result = [];
$result['error'] = false;
$result['code'] = "DB_UPDATE_ERROR"; //better with constant
$result['msg'] = "Impossible save bla, bla, bla";
echo json_encode($result);
关于javascript - PHP 的 AJAX 输出错误代码,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22441929/