Passing a Variable from PHP to Javascipt.

[BellQuestWars]

Hey guys, another question. I have a program (javascript) that needs a number.  I need to get that number from a php document. I currently have this:

Javascript:
var x="<?= $x ?>";

<?php
$x = 5;
?>

 

But that does nothing (i found it through a google search.)

Should I just use AJAX for this?

 

Thanks!

[pastcow]

You need to make sure your PHP is being executed. It could be that your javascript is inside a .js file which isnt processed by php. An alternate solution might be to do <script src="bleh.php"> and have the php output something along the lines of <script>var x = 5</script> etc...

 

It might well be better to use AJAX but it depends on the situation...

[Pikachu2000]

Don't use short "quick echo" tag syntax <?= use the full <?php echo syntax instead. Short tags are disabled by default now.

[BellQuestWars]

Okay, so I have a script that uses a php variable to get a number, and the php variable is collected from the database. The problem is the php variable is a string, and the Javascript variable is a number, so I need a way to convert a string into a number. Heres my php script:

<?php
session_start();
require_once("connect.php");
$result = mysql_query("SELECT * FROM members WHERE username='$_SESSION[username]'");
$x = $row[x];
$y = $row[y];
?>

[coffeecup]

i would assume the PHP output needs to be formated into XHTML tags and then Javascript can be used to extract the value. if you want to filter a numeric value with Javascript look into the parseFloat method.