Question

I know how to display content if JavaScript is disabled, but what I want to do is make a div suddenly appear even if the page is open at the time of JavaScript being disabled.

1. The page is opened.
2. The user goes to browser settings and disables JavaScript.
3. A div shows without refreshing the page.

How can I do this? I’ve seen other sites do this but I looked at their JavaScript files and didn’t find anything in it.

Thanks in advance!

Answer 1

Here’s a solution using CSS animations. They’re not supported everywhere, but I can’t think of any alternative.

This hides your message by giving it a font-size of 0, which is reset to 100% after a delay of one second. Every half-second the JavaScript restarts the animation by switching to a dummy animation which keeps the element hidden. (Demo on jsfiddle)

HTML

<div id="noscript-message">
    Please enable JavaScript to use this page.
</div>

<div>
    Spiffy JavaScript app here!
</div>

CSS

#noscript-message {  
    -webkit-animation-duration: 1s;
    -webkit-animation-name: delayedDisplay;
    color: blue;
}

@-webkit-keyframes delayedDisplay {
    0% { font-size: 0;}
    99% { font-size: 0;}
    100% { font-size: 100%; }
}

@-webkit-keyframes delayedDisplay_dummy {
    0% { font-size: 0; }
    100% { font-size: 0; }
}

JavaScript

var message = document.getElementById("noscript-message");

setInterval(function() {
    message.style.webkitAnimationName = "delayedDisplay_dummy";
    setTimeout(function() {
        message.style.webkitAnimationName = "delayedDisplay";
    }, 0);
}, 500);

You would need to duplicate all of the webkit prefixed properties with the other vendor prefixes; I’ve omitted them here for clarity.