Is there anyway to make a window to popup if javascript disabled?
<noscript>
<style type="text/css">
#body {display:none;}
#alertdiv {display:inline;}
</style>
</noscript>
where #alertdiv is a div designed to show the message you want (hidden by default) and #body the id of your main div that will be hidden if javascript is not activated. But it is optional.
A popup is a window.open command and doesn't exist without javascript. You have to emulate something similar. [update 2015: bootstrap, jquery... now offer wonderful ways of displaying alerts without requiring popups, as easily as $("#alert-box").modal("show");]
The idea is to use CSS to show parts of your page only when javascript is disabled.
Side-note: this won't validate w3c.
<body>
<div id="NoScriptPopup">Javascript is disabled on your browser</div>
<div id="YourContent">/*Your page content goes here*/</div>
<style>
#YourContent
{
display:none;
}
</style>
<script>
document.getElementById("NoScriptPopup").style.display = 'none';
document.getElementById("YourContent").style.display = 'block';
</script>
</body>
So if javascript is disabled on a browser, the #NoScriptPopup will appear and your content will be hidden. You could style #NoScriptPopup div using css to make it look like a popup.
Related
Basically I initially set certain elements to display: none; and visibility: hidden; in my css file and that make them visible with help of jQuery. I was thinking, if users have javascript disabled, that would mean that they will not see any of these hidden elements at all. How could I create a sort of a fallback in order to display this content to browsers with disabled javascript?
In your head, place something like :
<noscript>
<style type="text/css">
.hidden_by_js_class {display: block;}
</style>
</noscript>
From MDN:
The HTML <noscript> Element defines a section of html to be inserted
if a script type on the page is unsupported or if scripting is
currently turned off in the browser.
You can use the tag : http://www.w3schools.com/tags/tag_noscript.asp
<script type="text/javascript">
document.write("Javascript is On");
</script>
<noscript><span>Your Javascript is off</span></noscript>`
I'm looking for a solution to show the visitor of my website an info message, if he has no javascript enabled. I tried it with a message in a div, that is visible by default but immediately hidden by a jQuery function on start up. The problem is, that the message is visible for a short time (until it is hidden), what is very irritating.
Are there other ways to show a message, if JS is not enabled?
Thanks,
Konrad
Use the noscript tag:
<noscript>
<div class="awesome-fancy-styling">
This site requires JavaScript. I will only be visible if you have it disabled.
</div>
...
</noscript>
See https://developer.mozilla.org/en/HTML/Element/noscript.
You can use noscript, inside these tags is what will display if the user has javascript disabled.
If you want to hide the other content if the user doesn't have javascript enabled, you can do something like so (this uses jquery):
<style type="text/css">
.example {
display: none;
}
</style>
<script type="text/javascript">
$(document).ready(function(){
$('.example').show();
});
</script>
<div class="example">
<p>...</p>
</div>
<noscript>
<p>You must have javascript enabled for the example div to show!</p>
</noscript>
This will only show the content if the user has javascript enabled.
There is never a need to use <noscript> tags with browsers more recent than IE4 and Netscape 4. All that is needed is to use JavaScript to hide anything in the page that you don’t want those with javaScript enabled to see. This is way more flexible than <noscript> since you can actually test for the browser supporting specific JavaScript commands using feature sensing and only hide the HTML when the features that your JavaScript requires to work are actually supported properly by the browser.
<p align=center id=js_disabled_message>
x.com requires JavaScript Enabled <br> www.enable-javascript.com
</p>
<script>
document.getElementById('js_disabled_message').style.display = 'none';
</script>
The above code will hide the p tag, only if js is enabled.
It's kinda of the opossite logic to detect if JavaScript is enabled and it works well on all browsers.
SRC
You can use '' and provide the error message you want.
<html>
<body>
<script language="javascript" type="text/javascript">
<!--
document.write("Hello World!")
//-->
</script>
<noscript>
Sorry...JavaScript is needed to go ahead.
</noscript>
</body>
</html>
I can't get a jQuery UI modal dialog it to work as in the demo! Consider this recipe:
<html>
<head>
<script type="text/javascript" src="/javascripts/jquery.js"></script>
<script type="text/javascript" src="/javascripts/jquery-ui.js"></script>
</head>
<body>
<p>First open a modal dialog</p>
<p>Then try to hover over me</p>
<p>And <a onclick="alert('clicked!'); return false;" href="alsobroken"> click me!</a></p>
</body>
</html>
While the dialog is active, the second link is correctly disabled but the third link (onclick) still works! Also, the little browser hand appears when hovering both links. This is not like the demo... what am I doing wrong?
As Pointy points out, this is normally controlled by the jQueryUI CSS. But one can get around it by adding slightly hackish snippet to one's CSS file.
.ui-widget-overlay {
height:100%;
left:0;
position:absolute;
top:0;
width:100%;
}
That way the "shroud" div covers up all buttons and there's no need to use the jQueryUI CSS.
The problem is that you're not including the jQuery UI CSS file(s). You get the CSS file from the download package you prepare at the jQuery UI site, or I think you can get the standard "lightness" one from Google. Without the CSS file, the mechanism can't make the "shroud" layer work. Also you may have noticed that the dialog doesn't look like anything; that'll get better too when you add the CSS files.
http://jsfiddle.net/wxyBG/1/
So I was thinking a simple way to deal with javascript being disabled by the browser would be the following:
<head>
<title>JavaScript Test</title>
<noscript>
<meta http-equiv="Refresh"
content="1;url=nojs.html" />
</noscript>
</head>
And having the nojs.html have something like:
<p>Return to test after enabling javascrpt.</p>
At the crash page.
This isn't my preferred method, but it's nice and simple until something more graceful can be worked out for users without javascript.
However, it is not valid to put a <noscript> element in the head section. The preliminary tests worked anyway, of course, but I'm superstitious when it comes to my code being valid, plus I'd hate for this to actually fail a field test.
So is there a valid way to do this? Perhaps wrapping the noscript in another element, like an object tag? Or some even simpler way I'm not thinking of?
I am not sure why you need to redirect to another page instead of just showing a message. I use JS and a little CSS to handle these situations for me. Something like this:
<head>
....
<script type="text/javascript"> document.documentElement.className += " js"</script>
<link rel="stylesheet" type='text/css' href="css/layout.css" media="all" />
</head>
<body>
<div id="noscript">Please enable JavaScript, then refresh this page. JavaScript is required on this site</div>
<div id="wrapper">
...
</div>
</body>
Then in layout.css:
#wrapper { display: none } /* Hide if JS disabled */
.js #wrapper { display: block } /* Show if JS enabled */
.js #noscript { display: none } /* Hide if JS enabled */
By doing it this way, the class is applied to the html element before the page is rendered so you won't get a flicker as the non-JS content is swapped out for the JS content.
Doug's solution is pretty good, but it has a few drawbacks:
It is not valid to have a class attribute on the html element. Instead, use the body.
It requires that you know what display type to set the element to (i.e. ".js #wrapper { display: block }").
A simpler, more valid and flexible solution using the same approach could be:
<html>
<head>
<!-- put this in a separate stylesheet -->
<style type="text/css">
.jsOff .jsOnly{
display:none;
}
</style>
</head>
<body class="jsOff">
<script type="text/javascript">
document.body.className = document.body.className.replace('jsOff ','');
</script>
<noscript><p>Please enable JavaScript and then refresh the page.</p></noscript>
<p class="jsOnly">I am only shown if JS is enabled</p>
</body>
</html>
With this, it's valid html (no class attribute on the html element). It is simpler (less CSS). It's flexible. Just add the "jsOnly" class to any element that you want to only display when JS is enabled.
The <noscript> tag cannot be in the <head>, it must be in the <body>
The common practice is to show a message instead of redirecting, as there is no way to redirect only if javascript is disabled.
You could do it the other way around, have the first page be nojs.html, and on that page use javascript to redirect to the main content.
If you truly want a valid way to do it, make your main page the nojs.htm page and use JS to hide all content before it's shown to the user and immediately redirect to the real main page using javascript.
I like Doug's solution. However, if you need to redirect, I would remember that while there is a spec and a standard, the world of web browsers is a dirty, imperfect world. Whether or not something is allowed by the spec is not as important as whether or not it works in the set of browsers you care about.
Just look at the source code of any major site... Most of them won't validate I'd bet :)
What about:
noscript{
z-index:100;
position:absolute;
top:0;
left:0;
width:100%;
height:100%;
min-height:1024px; background:#FFF;
}
And:
<noscript>
<p>Please enable Javascript on your browser.</p></noscript>
Is there a tag in HTML that will only display its content if JavaScript is enabled? I know <noscript> works the opposite way around, displaying its HTML content when JavaScript is turned off. But I would like to only display a form on a site if JavaScript is available, telling them why they can't use the form if they don't have it.
The only way I know how to do this is with the document.write(); method in a script tag, and it seems a bit messy for large amounts of HTML.
Easiest way I can think of:
<html>
<head>
<noscript><style> .jsonly { display: none } </style></noscript>
</head>
<body>
<p class="jsonly">You are a JavaScript User!</p>
</body>
</html>
No document.write, no scripts, pure CSS.
You could have an invisible div that gets shown via JavaScript when the page loads.
I don't really agree with all the answers here about embedding the HTML beforehand and hiding it with CSS until it is again shown with JS. Even w/o JavaScript enabled, that node still exists in the DOM. True, most browsers (even accessibility browsers) will ignore it, but it still exists and there may be odd times when that comes back to bite you.
My preferred method would be to use jQuery to generate the content. If it will be a lot of content, then you can save it as an HTML fragment (just the HTML you will want to show and none of the html, body, head, etc. tags) then use jQuery's ajax functions to load it into the full page.
test.html
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
$.get('_test.html', function(html) {
$('p:first').after(html);
});
});
</script>
</head>
<body>
<p>This is content at the top of the page.</p>
<p>This is content at the bottom of the page.</p>
</body>
</html>
_test.html
<p>This is from an HTML fragment document</p>
result
<p>This is content at the top of the page.</p>
<p>This is from an HTML fragment document</p>
<p>This is content at the bottom of the page.</p>
First of all, always separate content, markup and behaviour!
Now, if you're using the jQuery library (you really should, it makes JavaScript a lot easier), the following code should do:
$(document).ready(function() {
$("body").addClass("js");
});
This will give you an additional class on the body when JS is enabled.
Now, in CSS, you can hide the area when the JS class is not available, and show the area when JS is available.
Alternatively, you can add no-js as the the default class to your body tag, and use this code:
$(document).ready(function() {
$("body").removeClass("no-js");
$("body").addClass("js");
});
Remember that it is still displayed if CSS is disabled.
I have a simple and flexible solution, somewhat similar to Will's (but with the added benefit of being valid html):
Give the body element a class of "jsOff". Remove (or replace) this with JavaScript. Have CSS to hide any elements with a class of "jsOnly" with a parent element with a class of "jsOff".
This means that if JavaScript is enabled, the "jsOff" class will be removed from the body. This will mean that elements with a class of "jsOnly" will not have a parent with a class of "jsOff" and so will not match the CSS selector that hides them, thus they will be shown.
If JavaScript is disabled, the "jsOff" class will not be removed from the body. Elements with "jsOnly" will have a parent with "jsOff" and so will match the CSS selector that hides them, thus they will be hidden.
Here's the code:
<html>
<head>
<!-- put this in a separate stylesheet -->
<style type="text/css">
.jsOff .jsOnly{
display:none;
}
</style>
</head>
<body class="jsOff">
<script type="text/javascript">
document.body.className = document.body.className.replace('jsOff','jsOn');
</script>
<noscript><p>Please enable JavaScript and then refresh the page.</p></noscript>
<p class="jsOnly">I am only shown if JS is enabled</p>
</body>
</html>
It's valid html. It is simple. It's flexible.
Just add the "jsOnly" class to any element that you want to only display when JS is enabled.
Please note that the JavaScript that removes the "jsOff" class should be executed as early as possible inside the body tag. It cannot be executed earlier, as the body tag will not be there yet. It should not be executed later as it will mean that elements with the "jsOnly" class may not be visible right away (as they will match the CSS selector that hides them until the "jsOff" class is removed from the body element).
This could also provide a mechanism for js-only styling (e.g. .jsOn .someClass{}) and no-js-only styling (e.g. .jsOff .someOtherClass{}). You could use it to provide an alternative to <noscript>:
.jsOn .noJsOnly{
display:none;
}
In the decade since this question was asked, the HIDDEN attribute was added to HTML. It allows one to directly hide elements without using CSS. As with CSS-based solutions, the element must be un-hidden by script:
<form hidden id=f>
Javascript is on, form is visible.<br>
<button>Click Me</button>
</form>
<script>
document.getElementById('f').hidden=false;
</script>
<noscript>
Javascript is off, but form is hidden, even when CSS is disabled.
</noscript>
You could also use Javascript to load content from another source file and output that. That may be a bit more black box-is than you're looking for though.
Here's an example for the hidden div way:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
*[data-when-js-is-on] {
display: none;
}
</style>
<script>
document.getElementsByTagName("style")[0].textContent = "";
</script>
</head>
<body>
<div data-when-js-is-on>
JS is on.
</div>
</body>
</html>
(You'd probably have to tweak it for poor IE, but you get the idea.)
My solution
.css:
.js {
display: none;
}
.js:
$(document).ready(function() {
$(".js").css('display', 'inline');
$(".no-js").css('display', 'none');
});
.html:
<span class="js">Javascript is enabled</span>
<span class="no-js">Javascript is disabled</span>
Alex's article springs to mind here, however it's only applicable if you're using ASP.NET - it could be emulated in JavaScript however but again you'd have to use document.write();
You could set the visibility of a paragraph|div to 'hidden'.
Then in the 'onload' function, you could set the visibility to 'visible'.
Something like:
<body onload="javascript:document.getElementById(rec).style.visibility=visible">
<p style="visibility: visible" id="rec">This text to be hidden unless javascript available.</p>
There isn't a tag for that. You would need to use javascript to show the text.
Some people already suggested using JS to dynamically set CSS visible. You could also dynamically generate the text with document.getElementById(id).innerHTML = "My Content" or dynamically creating the nodes, but the CSS hack is probably the most straightforward to read.