Is this possible to send response back to page by doing some if/else in ajax - php

Question

I want to know that is this possible to send response back by using some if/else on response we get from server under success in $.ajax..
ajax
$.ajax({
url : "request/register.php",
type : "POST",
data : 'firstName='+firstName + '&lastName='+lastName + '&userName='+userName + '&email='+email + '&password='+password + '&con_password='+con_password,
dataType : "text",
beforeSend : function(http){
$('#reg').val("Submitting....");
},
success : function(response,status,http){
var text = response;
alert(text);
if(text != "<span class=\"error\" data-icon =''>Empty Fields</span>"){
alert("Done");
}else{
alert("oOps")
}
},
error : function(http,status,error){
alert('server error');
}
})
registeration.php
//creating a variable for error messages
$error = "";
//creating a variable for success messages
$success = "";
//form validation
if($_SERVER['REQUEST_METHOD'] == "POST"){
$firstName = trim(filter_input(INPUT_POST, 'firstName' ,FILTER_SANITIZE_STRING));
$lastName = trim(filter_input(INPUT_POST, 'lastName' ,FILTER_SANITIZE_STRING));
$userName = trim(filter_input(INPUT_POST, 'userName' ,FILTER_SANITIZE_STRING));
$email = trim(filter_input(INPUT_POST, 'email' ,FILTER_SANITIZE_EMAIL));
$password = trim(filter_input(INPUT_POST, 'password' ,FILTER_SANITIZE_STRING));
$confirm_pass = trim(filter_input(INPUT_POST, 'con_password' ,FILTER_SANITIZE_STRING));
//checking for empty feilds
if($firstName == "" || $lastName == "" || $userName == "" || $email == "" || $password == "" || $confirm_pass == ""){
$error = "Empty Fields";
}
//checking username length
if(empty($error) && strlen($userName)<=5){
$error = "Username must be greater than 5 characters";
}
//checking for username existence
if(empty($error) && user_exist($userName)){
$error = "Username already exist";
}
//email validation
if(empty($error) && !filter_var($email,FILTER_VALIDATE_EMAIL)){
print_r($_POST);
$error = "Invalid Email address";
}
//checking for email existence
if(empty($error) && email_exist($email)){
$error = "Email already exist";
}
//checking password length
if(empty($error) && strlen($password)<=8){
$error = "Password must be greater than 8 characters";
}
//matching confirm password
if(empty($error) && $password !== $confirm_pass){
$error = "Password not match";
}
if(empty($error)){
if(user_registration($firstName,$lastName,$userName,$email,md5($password))){
$success = "Registered Suceessfully";
}else{
$error = "Something went wrong";
}
}
}
if(!empty($error)){
echo "<span class=\"error\" data-icon =''>".$error."</span>";
}
if (empty($error) && !empty($success)) {
echo "<span class=\"success\" data-icon =''>".$success."</span>";
}
If response is something like than i want to set input[type="text"] values should be same what user type and input[type="password"] should be blank & in other case if response is something like i want all the input feilds empty..

Answer 1

Yes, it's possible. But as the body may change overtime, it's best to do your if/else logic on the HTTP/1.1 Status Codes.
For example;
In your error response, simply return an error code 400 Bad Request by using http_response_code()
http_response_code(400);
And in your success response, simply return a 201 Created
http_response_code(201);
Now, in your jQuery, you can just look at the return status code and do the appropriate thing for the end-user
//[...]
success : function(response,status,http) {
if(http.status === 201) {
alert("User created");
} else {
//Assume there was an error
//Do some error logging for the end-user
alert("Could not create the user");
}
}