Passing variables from JavaScript to PHP code doesn't work

Question

I am trying to pass 2 variables from PHP to JavaScript and the vice versa.

I understand how to pass one variable, and it's okay, but when I tried to pass 2 variales, one of them passed, the other one didn't work.

Here is the code:

(1) file1.php:

<script type="text/javascript"> 
var id = <?php echo $id ; ?>
var q= <?php echo $q ; ?>
</script>
<script type="text/javascript"src="http://localhost/site/js/java.js">      </script>

(2) Java.js:

http://localhost/site/file2.php?id="+id +"&q="+q

(3) file2.php:

 $id = $_GET['id']; >> it works fine
 $q= $_GET['q']; >> doesn't pass (error: undefined)

I am not sure where the problem is, I just think it's in the number (2) step.

Any help will be appreciated.

have you verified that var q= is set and is not null. have you looked at http://localhost/site/file2.php?id="+id +"&q="+q after it was parsed to make sure that the q value is not empty? — Sean
– Sean, Commented Apr 10, 2015 at 19:41
Check if q is undefined if so you pass &q=undefined and you will have undefined in php. — jcubic
– jcubic, Commented Apr 10, 2015 at 19:43
the second variable is failing, meaning it is likely a case of a malformed get statement... does the get statement look normal try alerting it instead of importing it. — Joshua Byer
– Joshua Byer, Commented Apr 10, 2015 at 20:01

Toby Allen · Accepted Answer · 2015-04-10 23:17:15Z

2

As per comments, if q is a string then it needs to be enclosed in quotes. Remember all you php code is doing is generating text.

var q= <?php echo $q ; ?>

Should be

var q= "<?php echo $q ; ?>";

answered Apr 10, 2015 at 23:17

Toby Allen

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1 Comment

DevManX Over a year ago

Thank you so much, finely it worked, the 'magic' quotes solved the problem :)

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