Can't call javascript alert alertify library from PHP
PHP Snippet 1:
if(empty($user_password)){
echo "<script>$(function(){alertify.alert('Por favor, ingrese su usuario y contraseña');})</script>";
}
PHP Snippet 2:
<?php
//partial php code
if($saveData)
{
$_SESSION['variable'] = 'text here';
header('location:link.php');
}
?>
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<link href="path/alertify.css"></link>
</head>
<body>
<?php if(isset($_SESSION["variable"])):?>
<script>
window.onload = () => {
alertify.alert("Title", "<?=$_SESSION["variable"]?>");
}
</script>
<?php unset($_SESSION["variable"]); endif;?>
<script src="path/alertify.js"></script>
</body>