'Can't call javascript alert alertify library from PHP

I am using javascript alertify library for customized alerts.

When I call alertify from javascript everything is ok, but, If I do It from PHP doesnt works. THe error say "Alertify is not defined".

Is important to say that If I use default javascript alerts It works from PHP.

Why is happing this?

Regards

UPDATE:

  // This works
  if(empty($user_password)){ 
     echo "<script>alert('Por favor, ingrese su usuario y contraseña');</script>";
  }


  // This doesnt works
  if(empty($user_password)){ 
     echo "<script>alertify.alert('Por favor, ingrese su usuario y contraseña');</script>";
  }
  // Alertify library is included
javascriptphpalertalertify


Solution 1:[1]

Maybe the lib isn't ready yet, try:

if(empty($user_password)){ 
     echo "<script>$(function(){alertify.alert('Por favor, ingrese su usuario y contraseña');})</script>";
  }

Solution 2:[2]

This worked for me.

Use onload event on js|jquery to trigger alertify.
Use sessions to store feedback detail and check if sessions are set before echoed.

<?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>

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Toni Michel Caubet
Solution 2

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