How can I detect whether JavaScript is disabled using prototype?

How can I detect whether JavaScript is disabled using the prototype library? I don't want to use the &开发者_如何学编程lt;noscript> tag; I want to use something that prototype offers.

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It would be pretty hard to use javascript to detect if javascript is disabled.

To answer your subquestion, if you want to emulate <noscript> tag behavior without using noscript, make a <div> element with the content you want to show to non-javascript users, and then hide it with javascript on DOMReady event. It will do exactly the same thing as a noscript tag.

<script type="Text/JavaScript">
document.observe("dom:loaded", function() {
  $('simulate_noscript').hide();
});
</script>

<div id="simulate_noscript">
This is some content only users with JS disabled will see.
</div>

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Since Prototype is JavaScript, you cannot use it to detect whether Javascript is disabled or not. You have to use the <noscript> tag.

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You can't detect that javascript is disabled using javascript. Google graceful degradation, and also progressive enhancement.

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You can't use JavaScript to determine if JavaScript is enabled; if it's not, then the script will never run. Instead, look to inject behaviours which require script using scripts themselves. This is a core principle of progressive enhancement.

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Ummm if Javascript is disabled Prototype is never going to run my friend.

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Prototype is a JavaScript framework. If JavaScript is disabled, Prototype will not run, making a JavaScript enabled check useless.

You will need to use a <noscript> tag to handle situations where JavaScript is disabled.

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Just thought I'd add to the myriad of comments already that question how you are to use javascript with javascript disabled. Make sure it degrades well of course.