Passing PHP variable into JavaScript [duplicate]

This question already has answers here: How do I pass variables and data from PHP to JavaScript? (19 answers) Closed 8 years ago.

I've a PHP session variable, $_SESSION['user'], alive throughout the session. In the head section, I've my JavaScript file included, scripts.js.

How do I pass the session variable into the JavaScript file if I want something like the following.

$.("#btn').click (
     function() {
        alert('<?php echo $_SESSION['user']; ?>');
     }
)

As the <?php ?> isn't recognized in the JavaScript file, the code above doesn't work. So I've to put i开发者_JAVA技巧n the PHP file itself, but how do I keep it in the JavaScript file?

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In your PHP file you could set your user as a global varibale:

<script type="text/javascript">
    var ptamzzNamespace = {
       sessionUser : '<?php echo $_SESSION['user']; ?>'
    }        
</script>

Include this before including your external JavaScript code.

Then in your JavaScript file you can use it:

$.("#btn').click (
     function() {
        alert(ptamzzNamespace.sessionUser);
     }
)

Additionally: If you're not sure if your session varibale can contain quotes itsself, you can use addslashes() to fix this problem:

<?php echo addslashes($_SESSION['user']); ?> even if this will maybe produce something you don't really want to display (because it produces a string with slashes) it will help that your code will not fail. (Thanks to Artefacto)

Would this be an option for you?

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Set the userID (in PHP) in an input type hidden in your file. In your JavaScript code you can read the hidden input types value.

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You could set your server up to parse .js files as PHP. For example, in Apache config or .htaccess file:

<FilesMatch "scripts.js">
    AddHandler application/x-httpd-php5 .js
</FilesMatch>

---

try with below logic

print ' <script type="text/javascript" language="javascript"> 
function checkForm() 
{ 
     var username = "'.$_SESSION['user'].'"; 
     if( username == '') 
     { 
        alert('No Times selected'); 
        return false; 
      }
}
</script>';

---

Parse the included JavaScript file as PHP

Create a .htaccess file in you JavaScript directory and add the following line.

AddHandler php-cgi .js

<?php ?> tags till now be recognized by your JavaScript file.

Use Ajax to fetch the user ID

Create a file called getID.php which only echoes the users ID. Then in your JavaScript file you can use the following code.

$.get('getID.php', function(uid) {
  alert('User ID is:' + uid);
});

Create a script tag before including the JavaScript printing user ID.

<script type="text/javascript">
userID = <?php echo $_SESSION['user']; ?>;
</script>

You will now have access to the users ID using variable userID.