write javascript to page based on a condition

Question

I need to remove some Javascript code based on a server side condition (PHP). What I currently have is a variable holding the Javascript code as text and based on the condition I either echo it or not. However, it's cumbersome to maintain. How do I go about doing it?

I also tried to use something like what follows, but it's not working.

<?php if(condition) { ?> <script> stuff here </script> <?php } ?>

I'm sorry for the formatting, I have no idea why the less-then sign is making the entire line disappear.

That approach should work OK. But there are two other errors in that line: no ? before php and no $ before condition. If it's just formatting - fix it, but if it's in your coe - that is a source of the problem — J0HN
– J0HN, Commented Aug 17, 2011 at 12:32
Why theis is not working? You are getting PHP errors, or JS is just not working? If you open "Source View" (Ctrl+U in FF and Chrome, if I'm not mistaking), do you see your script where it should be? — J0HN
– J0HN, Commented Aug 17, 2011 at 12:39
@J0HN no errors at all. When I Source View the javascript code is found on the page which means the code is not working properly. — Ali
– Ali, Commented Aug 17, 2011 at 12:41
Try replacing condition with false, and tell us if that works. — Some Guy
– Some Guy, Commented Aug 17, 2011 at 12:44

Abraham · Accepted Answer · 2011-08-17 12:35:15Z

2

The best way is to do something like this:

<?php
  if ($something) {
?>
<script>
  alert('hi')
</script>
<?php
  }
?>

answered Aug 17, 2011 at 12:35

Abraham

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1 Comment

Ali Over a year ago

This is not working at all ;(. The script tag is always showing. Is there anything that I should take into consideration?

Edoardo Pirovano · Accepted Answer · 2011-08-17 12:32:46Z

0

Besides including it in a variable and outputting it conditionally, the only other possibility that I can think of is to put the JavaScript code in a file, and then have a PHP condition which outputs an include for that JavaScript file if it is true.

answered Aug 17, 2011 at 12:32

Edoardo Pirovano

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Comments

wanovak · Accepted Answer · 2011-08-17 12:32:51Z

0

This doesn't work?

<?php if(condition){ ?>
    <script> ... </script>
<?php } ?>

answered Aug 17, 2011 at 12:32

wanovak

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2 Comments

J0HN Over a year ago

condition should be $condition, eh?

Obmerk Kronen Over a year ago

so is it CONDITION or condition ? :-)

genesis · Accepted Answer · 2011-08-17 12:35:42Z

0

<?php 
define('condition', true);
if(condition) { ?> <script> stuff here </script> <?php } ?>

should work

answered Aug 17, 2011 at 12:35

genesis

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2 Comments

Ali Over a year ago

sorry, the condition is just something I wrote to denote there is a condition here, not a constant. I messed the formatting pretty badly.

genesis Over a year ago

it doesn't matter, if condition is true, it's outputed

user482024 · Accepted Answer · 2013-01-06 03:24:55Z

0

what about hiding or showing the // comment lines with php?

if ($something){
echo "//"; ?>   <script> 
<?php
echo "//"; ?>     alert('hi') 
<?php
echo "//"; ?>   </script> 
<?php

}

answered Jan 6, 2013 at 3:24

user482024

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