Ajax failed registration do not echo result - javascript

I have a an ajax post method that if success will alert "account successfully created". my problem is when it's not created it should alert account already exists, But what the problem it still alert the same.
script code:
$(document).ready(function(){
$("#btn-register").click(function(){
var regaccount = $("#regaccount").val();
var regpass = $("#regpass").val();
if((regaccount == "") || (regpass == "")){
alert("Information required!");
}else {
$.ajax({
type: "POST",
url: "register.php",
data: "regaccount="+regaccount+"&regpass="+regpass,
success: function(data){
alert("account successfully created!");
},
error:function(){
alert("account already exists");
}
});
}
$("#regaccount").val('');
$("#regpass").val('');
return false;
});
});
register.php
<?php
include 'function.php';
session_start();
ob_start();
$userid = rand(100000, 999999);
$regaccount = $_POST['regaccount'];
$regpass = $_POST['regpass'];
$regaccount = stripslashes($regaccount);
$regpass = stripcslashes($regpass);
$salt = "dctech2015ABcRXd";
$regpass = md5($regpass) . $salt;
$regpass = sha1($regpass);
$con = new Functions();
$con = $con->db;
$stmt = $con->query("SELECT * FROM users WHERE username = '$regaccount'");
$count = $stmt->rowCount();
if($count != 1){
$con = new Functions();
$con = $con->db;
$status="Offline";
$stmt = $con->prepare("INSERT INTO users(user_id, username, password, status)VALUES(:userid, :account, :password, :status)");
$stmt->bindValue(':userid', $userid);
$stmt->bindValue(':account', $regaccount);
$stmt->bindValue(':password', $regpass);
$stmt->bindValue(':status', $status);
$stmt->execute();
}else{
echo '<script>alert("account name already exists");</script>';
}
ob_end_flush();
?>

You need to do following changes to make this work:
1) In your PHP code, do not write any alert.
2) Whether user exists in database or newly inserted, AJAX request will fetch only data. We have to handle the logic.
3) AJAX error method will be called only when AJAX request is failed (either request not sent or response status is not 200 OK).
4) In your case, error method will never be called if user already exists or even user is inserted as data is being correctly transferred from JavaScript to PHP.
if($count != 1){
$con = new Functions();
$con = $con->db;
$status="Offline";
$stmt = $con->prepare("INSERT INTO users(user_id, username, password, status)VALUES(:userid, :account, :password, :status)");
$stmt->bindValue(':userid', $userid);
$stmt->bindValue(':account', $regaccount);
$stmt->bindValue(':password', $regpass);
$stmt->bindValue(':status', $status);
$stmt->execute();
echo 'success';
}
else{
echo 'exists';
}
AND
$.ajax({
type: "POST",
url: "register.php",
data: "regaccount="+regaccount+"&regpass="+regpass,
success: function(data){
if (data == 'success') {
alert("account successfully created!");
}
else if (data == 'exists') {
alert("account already exists");
}
},
error:function(){
alert("Unknown problem occured.");
}
});

Here you are trying to prompt message into AJAX error section which is wrong. You need to handle both into success section.
The very simple example is, return $count and check that value if greater then 0 means record is exist.
Changes in register.php code:
if($count != 1){
$con = new Functions();
$con = $con->db;
$status="Offline";
$stmt = $con->prepare("INSERT INTO users(user_id, username, password, status)VALUES(:userid, :account, :password, :status)");
$stmt->bindValue(':userid', $userid);
$stmt->bindValue(':account', $regaccount);
$stmt->bindValue(':password', $regpass);
$stmt->bindValue(':status', $status);
$stmt->execute();
}
echo $count;
I remove else part which is not require. And use $count for AJAX response.
And make correspond change into AJAX part also:
$.ajax({
type: "POST",
url: "register.php",
data: "regaccount="+regaccount+"&regpass="+regpass,
success: function(data){
//If record exist...
if(data > 0){
alert("account name already exists");
}
else {
alert("account successfully created!");
}
},
error:function(){
alert("There is some error, Please try after some time OR contact site admin.");
}
});
Hope this is very easy to understand and help to other user also.

Related

[Ajax][PHP] - login form, response is always empty

I have a problem with my login form. Every time when i write (correct or incorrect) login and password in my login form, my JS script return error and when i try to print "response" it is empty.
Can anyone help?
$(document).ready(function(){
$("#submit").click(function(e){
e.preventDefault();
var name = $("#name").val().trim();
var paw = $("#paw").val().trim();
$.ajax({
url: 'check.php',
type: 'POST',
data: {name:name, paw:paw},
success: function(response){
if(response == 1){
window.location= "home.php";
}
else{
alert("error");
}
}
});
});
});
<?php
session_start();
require_once 'dbconfig.php';
error_reporting(E_ALL ^ E_NOTICE);
if(isset($_POST['submit']))
{
$name = trim($_POST['name']);
$paw1 = trim($_POST['paw']);
$paw = md5($paw1);
try {
$stmt = $pdo->prepare("SELECT * FROM user WHERE login=:nazwa and haslo=:has");
$stmt->execute(array(':nazwa'=>$name, ':has'=>$paw));
$count = $stmt->rowCount();
$row = $stmt->fetch(PDO::FETCH_ASSOC);
if($row['haslo']==$paw){
echo 1;
$_SESSION['user_session'] = $row['login'];
}
else {
echo 0;
}
} catch (\Exception $e) {
echo $e->getMessage();
}
}
?>
Remove the if(isset($_POST['submit'])) line. The reason is that the button key value is not sent via the AJAX call. To verify, do a print_r($_POST);
instead verify that name and password variables are not empty()
if (!empty($_POST['name']) && !empty($_POST['paw'])) {
}
Also do not use md5() for your passwords. use php's password_hash() to hash and password_verify() to verify that the posted password via the form matches the hash stored in the database for that user.

Error (net::ERR_EMPTY_RESPONSE) on AJAX call

When the AJAX is called I always get these errors:
net::ERR_EMPTY_RESPONSE or net::ERR_CONNECTION_RESET
I also tryed different browsers (Chrome and Edge) but it is only working on localhost.
Thanks for all your help and support.
My PHP code (register.php):
require_once 'mysql_conn.php';
// username and password sent from form
$myUsername = mysqli_real_escape_string($db,$_POST['username']);
$myPassword = mysqli_real_escape_string($db,$_POST['password']);
$myRepPassword = mysqli_real_escape_string($db,$_POST['rep_password']);
if($myPassword == $myRepPassword && strlen($myUsername) >= 3 && strlen($myPassword) >= 8)
{
$userCheck = "SELECT id FROM users WHERE username = '$myUsername'";
$result = mysqli_query($db,$userCheck);
$count = mysqli_num_rows($result);
if($count > 0)
{
echo "This user already exists";
}
else
{
$sql = "INSERT INTO users (username, password) VALUES ('$myUsername', '$myPassword')";
if ($db->query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . $db->error;
}
$db->close();
}
}
else
{
echo "Please check the values you inserted";
}
and the AJAX call:
$(function () {
$('form').submit(function (e) {
e.preventDefault();
$.ajax({
type: 'POST',
url: 'register.php',
data: {username:username, password:password, rep_password:rep_password},
success: function (data) {
errorHandling(data);
}
});
});
});
I don't know how, but I solved it by deleting and re-creating the register.php file

How to handle success with 'if - else' in ajax call and response?

I have a written code in AJAX which checks whether password exists or not. if yes it sends "OK" as output else "Incorrect " as output . i want to success handler in AJAX call's response to do task based on that. How can handle it? I want if password is correct , to remove Attribute of disabled in a form element else i want i want that form element's attribute remained back as disabled.
AJAX code goe like this :
$("#currentpassword").keyup(function() {
var name = $(this).val();
if (name.length > 5) {
$("#result").html('checking...');
$.ajax({
type: 'POST',
url: 'checkPassword.php',
data: $(this).serialize(),
success: function(data) {
if (data == "1") {
$("#result").html(data);
$("#newpassword").removeAttr("disabled");
$("#confirmpassword").removeAttr("disabled");
} else {
$("#result").html(data);
}
}
});
return false;
} else {
$("#result").html('');
}
});
checkpassword php file looks like below :
<?php
include_once 'includes.php';
// Submitted form data
$currentpassword=$_POST['currentpassword'];
$result = mysqli_query($db,"SELECT * FROM `users` WHERE `password`='$currentpassword' AND `username`='$session_username'");
$row = mysqli_num_rows($result);
if($row!=1) {
echo "<span style='color:red;'>Incorrect Password !!!</span>";;
}
else {
echo "OK";
}
// Output status
?>
The Good way is The PHP file should look like this
<?PHP
header('Content-type:application/json;charset=utf-8');
include_once 'includes.php';
$currentpassword=$_POST['currentpassword'];
$result = mysqli_query($db,"SELECT * FROM `users` WHERE `password`='$currentpassword' AND `username`='$session_username'");
$count = mysqli_num_rows($result);
if($count! = 1) {
header('HTTP/1.1 401 Unauthorized', true, 401);
echo json_encode('In Correct Password');
} else {
header('HTTP/1.1 404 Not Found', true, 404);
echo json_encode('Not Found');
}
And your Jquery will be
$.ajax({
type: 'POST',
url: 'checkPassword.php',
data: $(this).serialize(),
success: function(data) {
// Only 200 comes here
}, error(jqXHR, exception) {
// All errors except 200 comes here.
}
});
Hope this helps

Ajax url: parameter and checking for success

im not so sure how this works, but where does my success(data) value come from?
must I return a value in url: php/login.php?
$.ajax({
url: 'php/login.php', //must i return a value in login.php?
data: {username:username,password:password},
type: "POST",
dataType: 'json',
success: function(data)
{
if(data == true){
console.log("sdfsdfs " + data);
login.submit();
}
else{
console.log("NO DATA PRESENT");
}
}
//else do an alert("please lgo in again");
});
in php/login.php i query the DB to see if such a user exists and if password match
part of my login.php
<?php
echo $username = $_POST['username']; //not echo-ing
echo $password = $_POST['password'];
if ($_POST['login']) //check if the submit button is pressed
{
$remember = $_POST['remember'];
if ($username&&$password) //check if the field username and password have values
{
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$connect=mysqli_connect($dbhost,$dbuser,$dbpass) or die("Unable to Connect");
mysqli_select_db($connect,"clients") or die("Could not open the db");
$sql = "SELECT * FROM clients.users WHERE username='$username'";
$login = mysqli_query($connect, $sql);
if (mysqli_num_rows($login))
{
while ($row = mysqli_fetch_assoc($login))
{
$db_password = $row['password'];
if ($password==$db_password)
{
$loginok = TRUE;
echo json_encode( true );
} else {
echo json_encode( false );
echo "Please re-enter username and password, they did not match";
header("Location: ../login.php");
}
?>
When you want to return some data using ajax, you need to echo data in your script that will be called by ajax. If the request is successful, it will return everything you echoed in your script into your parameter you specified in success function.
success: function(data)
{
// code...
}
so "data" will contain result from your script, then you can do whatever you want.
EDIT:
Well, i would solve it like this
$db_password = $row['password'];
if ($password==$db_password)
{
echo json_encode(array("status" => "ok", "message" => "Login successful!"));
} else {
echo json_encode(array("status" => "error", "message" => "Please re-enter username and password, they did not match!"));
//header("Location: ../login.php"); you don't need this
}
you can't echo json, then some text after it. You can, but it is not recommended at all.

Do not open page when try to make login using jquery, ajax and php

I have the file "index.html" that contains login form, a file "dash.js" that gets username and password from login form and redirects to the file "connectdb.php" that check the login with database, and in case of success start a session in file "stock.php". The problem is that when I try to make login it redirects to the file "stock.php", but it sends again for index.html, do not showing the page "stock.php". The password and username are correct. I do not know what I'm doing wrong.
Here is go my code.
dash.js
$('#btnlogin').click(function() {
var username = $('#user').val();
var password = $('#pass').val();
console.log("passsas qaqiioooo" + username + "- " + password);
$.ajax({
type: 'POST',
url: 'connectdb.php',
data: {user: username, pass: password},
success: function(data){
window.location="stock.php";
},
error: function(jqXHR, textStatus, errorThrown){
alert('deu barraca: ' + textStatus);
}
});
});
connectdb.php
<?php
$server = 'localhost';
$user = 'root';
$password = '********';
$database = '***********';
$con = mysqli_connect($server, $user, $password, $database);
if (!$con) {
die('Nao e possivel conectar a base de dados: ' . mysqli_error($con));
}
if (isset($_POST['user']) && isset($_POST['pass'])) {
$myusername = $_POST['user'];
$mypassword = $_POST['pass'];
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM user WHERE username='$myusername' and password='$mypassword'";
$result=mysqli_query($con,$sql);
$count=mysqli_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
$_SESSION['myusername'] = $myusername;
$_SESSION['mypassword'] = $mypassword;
}
else {
echo "Wrong Username or Password";
}
}
?>
stock.php
<?php
session_start();
if(!isset( $_SESSION['myusername'] )){
header("location:index.html");
}
?>
<html>
<body>
Login Successful
</body>
</html>
Sorry for my bad english.
the problem i can see here is that your $.ajax success event is fired in every case. no matter if your database connection fails, your login-data is correct or incorrect. $.ajax will always be successful in getting a valid response from your connectdb.php.
there are different ways to make it work, here is my simple suggestion:
1. in your connectdb.php-file, make sure you are always returning something with echo:
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){
$_SESSION['myusername'] = $myusername;
$_SESSION['mypassword'] = $mypassword;
echo "success";
}
else
{
echo "login_failed";
}
2. in your $.ajax function check for the value returned:
$('#btnlogin').click(function() {
var username = $('#user').val();
var password = $('#pass').val();
console.log("passsas qaqiioooo" + username + "- " + password);
$.ajax({
type: 'POST',
url: 'connectdb.php',
data: {user: username, pass: password},
success: function(data){
//debug the response:
console.log(data);
if(data == "success")
{
window.location="stock.php";
}
else if(data == "login_failed")
{
alert("login failed!");
}
else
{
alert("unknown response: " + data);
}
},
error: function(jqXHR, textStatus, errorThrown){
alert('deu barraca: ' + textStatus);
}
});
});
NOTE: it would be even better to use $.ajax with dataType: "json". but i assume you are quite new to AJAX in general, so i kept my solution rather simple.
UPDATE - found another issue:
3. you don't start your session in connectdb.php, so your session vars are never saved to the session:
session_start(); // <-- start the session here
$server = 'localhost';
$user = 'root';
$password = '********';
$database = '***********';
/*
...
*/

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