Going through some exercise which including JQuery + PHP combined together .The part I am not completely understand is in the Jquery code when the if statement starts ,can someone please explain from this point on what's going on?
HTML code:
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="" method="post">
<label for="name">Name:</label><br>
<input type="text" name="name"><br><br>
<label for="email">Email:</label><br>
<input type="text" name="email" id="email" autocomplete="off"><br><br>
<label for="password">Password:</label><br>
<input type="text" name="password"><br><br>
<input type ="submit" name="submit" value="Sign up">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="script.js" type="text/javascript"></script>
</body>
</html>
PHP code:
<?php
if(! empty($_GET['email'])){
$email=filter_var($_GET['email'],FILTER_VALIDATE_EMAIL);
if($email){
$con="mysql:host=localhost;dbname=eshop;charset=utf8";
$db= new PDO($con,'root','');
$query=$db->prepare("SELECT email FROM users WHERE email = ?");
$query->execute([$email]);
$email=$query->fetch(PDO::FETCH_ASSOC);
if($email){
echo true;
}
}
}
JQuery code:
$('#email').on('keyup', function(){
var userEmail= $(this).val().trim();
$('#result').remove();
var emailRegex= /^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(\.[a-z]{2,3})$/i;
if(emailRegex.test(userEmail)){
$.get('check_email.php',{email:userEmail},function(res){
if(res ==1){
$('#email').after('<span id="result">*Email is taken</span>');
}
});
}
});
