Jquery inside PHP

Question

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

• Rakesh Shetty: @ILIAS did you include jquery library ?
• the: Do you mean $x>0 instead of x>0?
• Gimby: 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.
• Rakesh Shetty: so we will need a more information, paste relevant code. Also check console is there any other errors?

Answer 1

You'll need to attach a handler something like:

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

or

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

• SBD: Obviously, the DOM is not fully loaded when manipulating elements of the DOM. @ILIAS

Answer 2

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

<script src="http://code.jquery.com/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){ ?>

Answer 3

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 }