请帮忙。我现在已经被困在同一个问题上大约两个星期了。所以我从Github下载了高级登录主脚本并对其进行了一些定制。
在创建Post类并尝试将ajax表单添加到＆＃34; views / logged_in.php＆＃34;之前，一切都很顺利。文件。表单验证错误消息已停止正确显示。在通过Ajax提交表单之前，我试图检查表单的输入字段是否为空。我不习惯这个脚本的设置方式。索引文件似乎调用了类。但是当我尝试添加ajax时，它会完全抛弃我。
有人可以告诉我在＆＃34; views / Logged in.php＆＃34;中添加一个简单的ajax表单到这个脚本的正确方法。如果输入字段为空，则在显示错误消息时显示文件？
P.S。我想显示PHP错误，而不是Javascript错误。在我的Post类中，我有一个错误和消息数组。
这是我的javascript ajax代码。
$('form.ajax').on('submit', function() {
var that = $(this),
url = that.attr('action'),
type = that.attr('method'),
data = {};
that.find('[name]').each(function(index, value) {
var that = $(this),
name = that.attr('name'),
value = that.val();
data[name] = value;
});
$.ajax({
url: url,
type: type,
data: data,
success: function(response) {
$("form.ajax")[0].reset();
console.log(response);
}
});
return false;
});
website.com/views/logged_in.php
<form action="<?php echo BASE_URL; ?>contact.php"` method="post" class="ajax">
<div class="new_post_header">
<div class="new_post_avatar"><img src="img/profile_pic_1.png" style="width:40px; height:40px;" /></div>
<textarea name="post_text" id="message" class="new_post_textarea" placeholder="Give a tip"></textarea>
</div><!--.new_post_header-->
<div id="new_post_options">
<div class="icon-camera post_options_icon"></div>
<div class="icon-camcorder post_options_icon"></div>
<div class="icon-tag post_options_icon"></div>
<button name="submit" type="submit" class="post_post_button">Post</button>
<a class="privacy_post_option" id="post_privacy_toggle">
<div class="icon-earth-grid privacy_option_icon"></div>
Public
<div class="icon-more-arrow privacy_option_arrow"></div>
</a>
</div><!--#new_post_options-->
</form><!--.ajax-->
website.com/classes/Post.php class
<?php
class Post
{
/**
* @var object $db_connection The database connection
*/
private $db_connection = null;
/**
* @var string $logged_in_user_id the poster's id variable
*/
public $logged_in_user_id = null;
/**
* @var string $post_text The post text variable
*/
public $post_text = "";
/**
* @var array collection of error messages
*/
public $errors = array();
/**
* @var array collection of success / neutral messages
*/
public $messages = array();
/**
* Checks if database connection is opened and open it if not
*/
private function databaseConnection()
{
// connection already opened
if ($this->db_connection != null) {
return true;
} else {
// create a database connection, using the constants from config/config.php
try {
// Generate a database connection, using the PDO connector
// @see http://net.tutsplus.com/tutorials/php/why-you-should-be-using-phps-pdo-for-database-access/
// Also important: We include the charset, as leaving it out seems to be a security issue:
// @see http://wiki.hashphp.org/PDO_Tutorial_for_MySQL_Developers#Connecting_to_MySQL says:
// "Adding the charset to the DSN is very important for security reasons,
// most examples you'll see around leave it out. MAKE SURE TO INCLUDE THE CHARSET!"
$this->db_connection = new PDO('mysql:host='. DB_HOST .';dbname='. DB_NAME . ';charset=utf8', DB_USER, DB_PASS);
return true;
// If an error is catched, database connection failed
} catch (PDOException $e) {
$this->errors[] = MESSAGE_DATABASE_ERROR;
return false;
}
}
}
/**
* creates a new post in the databse
*/
public function submitPost($logged_in_user_id, $post_text)
{
// remove extra space on post text
$post_text = trim($post_text);
// if the post text is empty
if (empty($post_text)) {
// show the errors
$this->errors[] = MESSAGE_USERNAME_EMPTY;
} else if ($this->databaseConnection()) {
// write new post data into database
$query_new_post_insert = $this->db_connection->prepare('INSERT INTO posts (poster_id, post_text, post_date) VALUES(:poster_id, :post_text, NOW())');
$query_new_post_insert->bindValue(':poster_id', $logged_in_user_id, PDO::PARAM_INT);
$query_new_post_insert->bindValue(':post_text', $post_text, PDO::PARAM_STR);
$query_new_post_insert->execute();
// id of new post
$post_id = $this->db_connection->lastInsertId();
// return the id of the last post to be added to database
return $post_id;
}
}
/**
* creates a new post in the databse
*/
public function getPost($logged_in_user_id)
{
// remove extra space on post text
$post_text = trim($post_text);
if ($this->databaseConnection()) {
// write new post into database
$query_new_post_insert = $this->db_connection->prepare('INSERT INTO posts (post_text) VALUES(:post_text)');
$query_new_post_insert->bindValue(':post_text', $post_text, PDO::PARAM_STR);
$query_new_post_insert->execute();
// id of new post
$post_id = $this->db_connection->lastInsertId();
// return the id of the new post
return $post_id;
}
}
}
website.com/contact.php
<?php
// start the seesion so that you can access the $_SESSION variable
session_start();
// put the current logged in user's id in a variable
$logged_in_user_id = $_SESSION['user_id'];
// include the config
require_once('config/config.php');
// include the to-be-used language, english by default. feel free to translate your project and include something else
require_once('translations/en.php');
// load the post class
require_once('classes/Post.php');
// create the post object
$post = new Post(
);
if (isset($_POST['post_text'])) {
// put the post text in a variable
$post_text = $_POST['post_text'];
// put the returned id from the submited post into a variable
$post_id = $post->submitPost($logged_in_user_id, $post_text);
}
?>
答案 0 :(得分：0)
您好我已经将您的提交按钮设为按钮并且onclick我已调用ajax功能
function test1()
{
var that = $('.ajax'),
url = 'contact.php',
type = 'POST',
data = {};
that.find('[name]').each(function(index, value) {
var that = $(this),
name = that.attr('name'),
value = that.val();
if(value=='')
{
alert("please enter value of " +name);
}
data[name] = value;
});
$.ajax({
url: url,
type: type,
data: data,
success: function(response) {
if(response==2)
{
alert("plaese enter text");
or
$('.error').html("plaese enter text");
}
if(response==1)
{
$("form.ajax")[0].reset();
}
console.log(response);
}
});
return false;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form method="post" class="ajax">
<div class="new_post_header">
<div class="new_post_avatar"><img src="img/profile_pic_1.png" style="width:40px; height:40px;" /></div>
<textarea name="post_text" id="message" class="new_post_textarea" placeholder="Give a tip"></textarea>
</div><!--.new_post_header-->
<div id="new_post_options">
<div class="icon-camera post_options_icon"></div>
<div class="icon-camcorder post_options_icon"></div>
<div class="icon-tag post_options_icon"></div>
<button type="button" onclick="return test1();" class="post_post_button">Post</button>
<a class="privacy_post_option" id="post_privacy_toggle">
<div class="icon-earth-grid privacy_option_icon"></div>
Public
<div class="icon-more-arrow privacy_option_arrow"></div>
</a>
</div><!--#new_post_options-->
</form><!--.ajax-->
答案 1 :(得分：0)
这样做的一种非常简单的方法是：
$('form.ajax').on('submit', function() {
var empty = true;
$("form.ajax input").each(function(){ // check each input
var val = $(this).val();
if(!$.trim(val) == ""){ // if the inputs are not empty
empty = false; // allow ajax to be submitted
}
});
if(empty){
alert("Input is empty!"); // alert that an input is empty
} else {
// ajax goes here
}
return false; // prevent form post
});
注意：如果input包含 JUST 空格（无文字），此程序也有效。我建议在服务器端检查这一点，而不仅仅是客户端（因为这在（潜在的）攻击者中可编辑）浏览器。