Validating forms Ajax PHP - php

Question

The jQuery/JavaScript/Ajax code is not mine. I'm learning and trying to understand it. The issue that I am having is after the data gets sent to the database the form is suppose to add class="show" to #sendmessage but its adding class="show" to #errormessage even though it was successful and the data was entered into the database. I don't understand why or how to fix it.
contact form index.html
<div class="form">
<div id="sendmessage">Your message has been sent. Thank you!</div>
<div id="errormessage"></div>
<form action="contactform/contactform.php" method="POST" role="form" class="contactForm">
<div class="form-row">
<div class="form-group col-md-6">
<input type="text" name="name" class="form-control" id="name" placeholder="Your Name" data-rule="minlen:4" data-msg="Please enter at least 4 chars" />
<div class="validation"></div>
</div>
<div class="form-group col-md-6">
<input type="email" class="form-control" name="email" id="email" placeholder="Your Email" data-rule="email" data-msg="Please enter a valid email" />
<div class="validation"></div>
</div>
</div>
<div class="form-group">
<input type="text" class="form-control" name="subject" id="subject" placeholder="Subject" data-rule="minlen:8" data-msg="Please enter at least 8 chars of subject" />
<div class="validation"></div>
</div>
<div class="form-group">
<textarea class="form-control" name="message" rows="5" data-rule="required" data-msg="Please write something for us" placeholder="Message"></textarea>
<div class="validation"></div>
</div>
<div class="text-center"><button type="submit">Send Message</button></div>
</form>
</div>
contactform.js
jQuery(document).ready(function($) {
"use strict";
//Contact
$('form.contactForm').submit(function() {
var f = $(this).find('.form-group'),
ferror = false,
emailExp = /^[^\s()<>#,;:\/]+#\w[\w\.-]+\.[a-z]{2,}$/i;
f.children('input').each(function() { // run all inputs
var i = $(this); // current input
var rule = i.attr('data-rule');
if (rule !== undefined) {
var ierror = false; // error flag for current input
var pos = rule.indexOf(':', 0);
if (pos >= 0) {
var exp = rule.substr(pos + 1, rule.length);
rule = rule.substr(0, pos);
} else {
rule = rule.substr(pos + 1, rule.length);
}
switch (rule) {
case 'required':
if (i.val() === '') {
ferror = ierror = true;
}
break;
case 'minlen':
if (i.val().length < parseInt(exp)) {
ferror = ierror = true;
}
break;
case 'email':
if (!emailExp.test(i.val())) {
ferror = ierror = true;
}
break;
case 'checked':
if (! i.is(':checked')) {
ferror = ierror = true;
}
break;
case 'regexp':
exp = new RegExp(exp);
if (!exp.test(i.val())) {
ferror = ierror = true;
}
break;
}
i.next('.validation').html((ierror ? (i.attr('data-msg') !== undefined ? i.attr('data-msg') : 'wrong Input') : '')).show('blind');
}
});
f.children('textarea').each(function() { // run all inputs
var i = $(this); // current input
var rule = i.attr('data-rule');
if (rule !== undefined) {
var ierror = false; // error flag for current input
var pos = rule.indexOf(':', 0);
if (pos >= 0) {
var exp = rule.substr(pos + 1, rule.length);
rule = rule.substr(0, pos);
} else {
rule = rule.substr(pos + 1, rule.length);
}
switch (rule) {
case 'required':
if (i.val() === '') {
ferror = ierror = true;
}
break;
case 'minlen':
if (i.val().length < parseInt(exp)) {
ferror = ierror = true;
}
break;
}
i.next('.validation').html((ierror ? (i.attr('data-msg') != undefined ? i.attr('data-msg') : 'wrong Input') : '')).show('blind');
}
});
if (ferror) return false;
else var str = $(this).serialize();
var action = $(this).attr('action');
if( ! action ) {
action = 'contactform/contactform.php';
}
$.ajax({
type: "POST",
url: action,
data: str,
success: function(msg) {
//alert(msg);
if (msg == 'OK') {
$("#sendmessage").addClass("show");
$("#errormessage").removeClass("show");
$('.contactForm').find("input, textarea").val("");
} else {
$("#sendmessage").removeClass("show");
$("#errormessage").addClass("show");
$('#errormessage').html(msg);
}
}
});
return false;
});
});
contactform.php
<?php
//Define access
define('_VALID', 'Yes');
//required files
require_once('../include/config/config.php');
//variables
$contactFormName = '';
$contactFormEmail = '';
$contactFormSubject = '';
$contactFormMessage = '';
$checkStep = 1;
//Add new message
if (isset($_POST['name'])){
//Get values
$contactFormName = $_POST['name'];
$contactFormEmail = $_POST['email'];
$contactFormSubject = $_POST['subject'];
$contactFormMessage = $_POST['message'];
// 1. check name form field
if($checkStep == 1){
if($contactFormName === $_POST['name']){
$contactFormName = filterName($contactFormName);
$checkStep++;
}else{
echo "No its not working";
}
}
// 2. check email field
if($checkStep == 2){
if($contactFormEmail === $_POST['email']){
$contactFormEmail = filterEmail($contactFormEmail);
$checkStep++;
}else{
echo "Uh Oh! Something went wrong with your email please try again!";
}
}
// 3. check subject
if($checkStep == 3){
if($contactFormSubject === $_POST['subject']){
$contactFormSubject = filterSubject($contactFormSubject);
$checkStep++;
}else{
echo "Uh Oh! Whats up with your subject";
}
}
// 4. check message
if($checkStep == 4){
if($contactFormMessage === $_POST['message']){
$contactFormMessage = filterMessage($contactFormMessage);
$checkStep++;
}else{
echo "Uh ho! Please write us a message";
}
}
// 5. insert message
if($checkStep == 5){
$sqlAddMessage = "
INSERT INTO contact_form(
name,
email,
subject,
message
) VALUES(
'$contactFormName',
'$contactFormEmail',
'$contactFormSubject',
'$contactFormMessage'
)
";
$queryAddMessage = $GLOBALS['mysqli']->query($sqlAddMessage);
if($queryAddMessage){
//code goes here
}
}else{
echo "Uh Oh! NO No No. Check step 5";
}
}
?>

Answer 1

The issue is that you're not setting $msg = "OK" anywhere in your function so the AJAX response is always going to the else statement.
contactform.php (in // 5. section)
if($queryAddMessage){
echo "OK";
}

Answer 2

You should echo msg checked by js in php as OK
if($queryAddMessage){
//code goes here
echo 'OK';
}

Answer 3

Just use a jQuery form validation plugin to validate form and its easier than using AJAX for the same.