For some reason some Javascript/Jquery code does not work when placing it inside PHP.

<?php
  if (x > 0) { 
?>    

<script type="text/javascript">   
   alert("Hi!");   
   $("#fault_message_mail").hide();
</script>

<?php
  } else . . .
?>

In case x>0 it is executed only the Alert and not the hide method(I'd like to hide a div declared in some html code).

Why it is not executed? Is it prudent to use jQuery inside PHP?

I've been searching similar questions in Stack overflow, however I cannot find a positive answer.

Thank you

For some reason some Javascript/Jquery code does not work when placing it inside PHP.

<?php
  if (x > 0) { 
?>    

<script type="text/javascript">   
   alert("Hi!");   
   $("#fault_message_mail").hide();
</script>

<?php
  } else . . .
?>

In case x>0 it is executed only the Alert and not the hide method(I'd like to hide a div declared in some html code).

Why it is not executed? Is it prudent to use jQuery inside PHP?

I've been searching similar questions in Stack overflow, however I cannot find a positive answer.

Thank you

• javascript
• php
• jquery
• html

• @ILIAS did you include jquery library ? – Rakesh Shetty Commented Sep 2, 2014 at 9:27
• Do you mean $x>0 instead of x>0? – the Commented Sep 2, 2014 at 9:29
• But do you understand WHY you need to change the code? I get the idea that you were under the impression that the javascript would run the moment you see it in your PHP code. – Gimby Commented Sep 2, 2014 at 9:42
• so we will need a more information, paste relevant code. Also check console is there any other errors? – Rakesh Shetty Commented Sep 2, 2014 at 9:43

3 Answers 3

You'll need to attach a handler something like:

$(document).ready(function(){
   ("#fault_message_mail").hide();
});

or

$('#mybutton').click(function(){
   ("#fault_message_mail").hide();
});

You have to inlude jQuery library if you have not included :

<script src="http://code.jquery./jquery-1.10.2.js"></script>

and then you have to write you code inside ready function like this :

$(document).ready(function(){
   ("#fault_message_mail").hide();
});

and third thing is that you have written a wrong syntax here :

<?php   
  if (x>0){ ?>
      ^

it should be like this :

<?php   
  if ($x>0){ ?>

maybe the element is not in the dom, try the following

  if (x>0){ ?>

  <script type="text/javascript">
        jQuery(function ($) { // run on document.ready
          alert("Hi!");   
          $("#fault_message_mail").hide();
        });
    </script>
<?php }