Javascript, Php, Ajax - php

Question

I have a problem with this my script.
$("#login").click(function(event) {
event.preventDefault();
var email = $("#email").val();
var pass = $("#password").val();
$.ajax({
url : "login.php",
method: "POST",
data: {userLogin:1, userEmail:email, userPassword:pass},
success : function(data){
if(data == "1"){
alert(data);
}
}
})
I want it to alert a value that I am getting from an echo in another php file
<?php
if(isset($_POST['userLogin'])){
$email = mysqli_real_escape_string($con, $_POST['userEmail']);
$password = md5($_POST['userPassword']);
$sql_login = "SELECT * from database where email = '$email' AND password = '$password'";
$query_login = mysqli_query($con, $sql_login);
$count_login = mysqli_num_rows($query_login);
if($count_login == 1){
$row_login = mysqli_fetch_assoc($query_login);
$_SESSION['uid'] = $row_login['user_id'];
$_SESSION['name'] = $row_login['first_name'];
echo "1";
}
}
?>
If I didn't put the alert(data) in an if condition, it displays the value I echo, but I need the condition to enable the right user logged in.

Answer 1

What can IF can also ELSE.
In your ajax add the else conditions to see if it helps uncover the issue:
if (data == "1") {
alert('youre in');
} else {
alert('try again');
}
And in your php, also account for the else condition (and do strict checking on that count of rows with ===):
if ($count_login === 1) {
// code ...
echo '1';
} else {
echo 'Sorry, the login is incorrect';
}

Answer 2

It works fine for me, if i always echo "1", the alert(data) show 1, in an if condition and out, pls, echo something else if isset($_POST['userLogin']) or $count_login == 1 are false, or put an
error : function(data) {
$('body').append("<div>"+data.responseText+"</div>")
}
in your ajax, to debug the prob. Because in your .php file, when you echo nothing, it returns a data in error, not in success, maybe that's your prob.