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The past day's I've been trying to return a true or false boolean to Ajax.

The Process: Someone submit's a form > Send to a PHP file > From PHP, check everything is correct. If yes, return true and echo 'correct'. > Output the result. In this case, it'll have to echo correct. And check if it's true or false.

The problem is, it will always return a false. Even when everything is correct. So when my login is correct, it will return a correct, as I expect. But it won't return a true.

My form:

<form id="loginform" class="col s12" name="loginform" method="post">
 <div class="input-field col s12">
 <i class="fas fa-user material-icons prefix"></i>
 <input id="hn" type="text" class="validate" name="hn">
 <label for="hn">Gebruikersnaam</label>
 </div>
 <div class="input-field col s12">
 <i class="fas fa-key material-icons prefix"></i>
 <input id="ww" type="password" class="validate" name="ww">
 <label for="ww">Wachtwoord</label>
 </div>
 <button class="mui-btn mui-btn--raised mui-btn--primary" id="forminlog"><i class="fas fa-chevron-right"></i> Inloggen</button>

Ajax:

$("#forminlog").click(function()
 $.ajax(
 type: 'POST',
 data: hn: document.getElementById("hn").value, ww: document.getElementById("ww").value,
 url: 'login.php',
 success: function(output) 
 swal(output);
 if(output == true)
 alert("true");
 else 
 alert("false");
 
 
 );
 event.preventDefault()
);

PHP:

<?php
function login() empty($pww))
 echo 'Vul alle velden in';

 
 else 
 //DATA VANUIT DB
 include("connection.php");
 $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 $sth = $dbh->prepare("SELECT * FROM gebruikers WHERE gebruikersnaam = :gebruiker");
 $pdoExec = $sth->execute(array(":gebruiker"=>$pgebruiker));
 $sth->execute();
 $result = $sth->fetch(PDO::FETCH_OBJ);
 //GEBRUIKERSNAAM
 $gebruikersnaam = $result->gebruikersnaam;
 //WACHTWOORD
 $wachtwoord = $result->wachtwoord;
 if(!strcasecmp($pgebruiker, $gebruikersnaam) == 0)
 echo 'Verkeerd gebruikersnaam.';
 
 elseif(!password_verify($pww, $wachtwoord) /*strcasecmp($pww, $wachtwoord) == 0*/)
 echo 'Verkeerd wachtwoord';
 
 else
 echo 'Correcte gegevens.';
 return true;
 /*session_start();
 $_SESSION['gebruiker'] = $gebruikersnaam;
 header('Location: veilig.php');*/
 //exit;
 
 

login();
?>

Two thing are to be returned from your login() function:

• a message


• a boolean

So I suggest you to output the data as a json string like this:

Before the login() function, declare an array:

$response = [];

Then, within all the conditions you have... just set msg and success accordingly, like, for example if the login is correct:

$response["msg"] = "You're logged in buddy!";
$response["success"] = true;

At the end of all conditions echo the array as a json string:

echo json_encode($response);

It will send the following string:

"msg":"You're logged in buddy!","success":true

** Make sure that echo is the only echo in that PHP file!

On client-side now, in the success callback, it would be:

success: function(output) 

 // Parse the string.
 var json = JSON.parse(output);

 swal(json.msg); // Sweet Alert...
 if(json.success)
 // something to do with the boolean true
 else 
 // Something else