Embedding javascript within php code

Question

I have embedded some javascript within php code. This was necessary after checking some php session variable value, and upon result, I use some JS within php to decide if some elements will be shown or not. Here is an example:

<?php

if ($_SESSION['myVar']==2)
      { echo '<script type="text/javascript" >

          document.getElementById("element1").style.visibility = "hidden";
         document.getElementById("element2").style.visibility = "hidden";

            </script>';
?>

The code works perfect for me. My question is : is the JS executed at the webserver(since it is embedded within php code) , initializing the page before it is sent to the client browser (and that what I think), or does the php portion run at the server, and the JS runs at the client later??

I know in normal situations the JS runs at the client browser,but was suspicious in this case,

I'm a junior programmer and any help is appreciated, thanks in advance.

never combine server-side and client-side scripting. I have worst experiences doing so. If you really want to use PHP in clientside validations, Use AJAX calls and get JSON from PHP to use in javascript. — user2286580
– user2286580, Commented Oct 7, 2014 at 12:12

Jerodev · Accepted Answer · 2014-10-07 12:08:35Z

1

Javascript is always executed in the browser of the client. The php code just inserts the javascript code as a block of text and the browser reads it as code.

answered Oct 7, 2014 at 12:08

Jerodev

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Asher · Accepted Answer · 2014-10-07 12:13:45Z

1

JavaScript is executed on client-side no matter what, but your PHP code you just inserted the code to make it available for the browser to execute it...

answered Oct 7, 2014 at 12:13

Asher

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Community · Accepted Answer · 2017-05-23 12:11:41Z

1

Php sends the JavaScript back to the Client as a response and then on the Client side JavaScript is run. Please read this ANSWER 123 and you might have a better explanation >> PHP & Embedded JavaScript Behavior. Thanks

edited May 23, 2017 at 12:11

CommunityBot

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answered Oct 7, 2014 at 12:21

Meer

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Comments

Lundin · Accepted Answer · 2014-10-07 13:28:00Z

-1

<?php

if ($_SESSION['myVar']==2)
      { 
?>
<script type="text/javascript" >
      document.getElementById("element1").style.visibility = "hidden";
         document.getElementById("element2").style.visibility = "hidden";
</script>
<?php } ?>

edited Oct 7, 2014 at 13:28

Lundin

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answered Oct 7, 2014 at 12:21

shashik493

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1 Comment

Nippey Over a year ago

This is not answering the question of @the4thDimension.

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