Looking for an Ajax or PHP trick to detect if they have Javascript

Question

I am looking for some kind of trick to determine if a user has javascript... I figure I could do it somehow by sending a ajax request at the top of a page, and in that ajax request, set a session variable, and then somehow reload the page, and see of it was set...

Is there any tricks like this around in PHP/AJAX?

what is your ultimate goal here? Do you just want to know on the client side (for CSS or something) or on the server side? Either way, this is a dupe... — Paolo Bergantino
– Paolo Bergantino, Commented Jun 23, 2009 at 23:14
A number of answers have attempted to actually answer this, but you are probably asking the wrong question. Build on stuff that works: icant.co.uk/articles/pragmatic-progressive-enhancement — Quentin
– Quentin, Commented Nov 30, 2009 at 15:48
possible duplicate of How to redirect if javaScript is disabled? — Paul Sweatte
– Paul Sweatte, Commented Sep 28, 2012 at 23:38

phihag · Accepted Answer · 2009-06-24 22:16:30Z

7

What you can do is add code like this (no AJAX needed):

<meta http-equiv="refresh" content="2;URL=/?nojs" />
<script type="text/javascript">
window.location.href="/?js";
</script>

However, you should not do that. Instead, serve the basic website every time, and decorate it with a script element that loads all the JavaScript that modifies and adds dynamic content.

edited Jun 24, 2009 at 22:16

answered Jun 23, 2009 at 23:17

phihag

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1 Comment

Emil H Over a year ago

Damnit. I was just about to post the same thing. :)

cletus · Accepted Answer · 2009-06-23 23:15:45Z

2

You can always use the noscript tags:

<noscript>
<input type="hidden" name="has_javascript" value="false">
</noscript>

and detect that on the server.

answered Jun 23, 2009 at 23:15

cletus

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Comments

meeech · Accepted Answer · 2009-11-30 15:45:32Z

0

aif is mistaken. Even if JS is disabled, if your browser supports JS it is listed as javascript=1.

answered Nov 30, 2009 at 15:45

meeech

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Aif · Accepted Answer · 2009-06-23 23:15:31Z

-2

you could use a very simple tip:

<script>document.location="/index2.php";</script>
<p>You need javascript for an improved navigation!</p>

where the current page (which I assume is index.php) is only used to redirect the visitor to the actual index page : index2.php

or use get_browser which provides a field for javascript. I tested it with firefox (disabling js and not) and it worked pretty fine for me.

answered Jun 23, 2009 at 23:15

Aif

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1 Comment

Christoph Over a year ago

you should set window.location.href instead of document.location

kostiak · Accepted Answer · 2009-06-23 23:15:35Z

-4

$results = get_browser();
if ($results["javascript"] == 1) {
echo "You have javascript";
}

(source)

answered Jun 23, 2009 at 23:15

kostiak

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1 Comment

cletus Over a year ago

I believe that only tells you whether the user's browser is capable of Javascript, not whether it's actually been enabled or disabled.

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