Old Browser Popup

Is there a way to check if a user is using a version of internet explorer older than version 10 and show them a popup that they need to update to best view the site?

Attached is an example.
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LVL 12
Nathan RileyFounderAsked:
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Ray PaseurCommented:
Sure.  You can detect the client browser in PHP with the $_SERVER["HTTP_USER_AGENT"] variable.  Here is what mine says:

Mozilla/5.0 (Windows NT 6.1; rv:30.0) Gecko/20100101 Firefox/30.0
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Ray PaseurCommented:
And in their HTML page source, there is this:
<!--[if lte IE 8]><div id="overflowIE" style="z-index:2000;position:fixed;top:0px;left:0px;width:100%;height:100%;background-image:url(http://guruenergy.com/media/images/bg_b70.png);overflow:hidden;">
<div id="iewarning"><h1>Please update your browser for a better experience.</h1>
<p>(And maybe crack up a Guru while it's being done).</p>
<table cellpadding="0" cellspacing="0" border="0">
	<tr>
		<td><a href="http://www.mozilla.org/en-US/products/download.html" target="_blank"><img alt="Firefox" src="/media/images/browsers/firefox.png"/><br/><span>Firefox</span></a><td>
		<td><a href="http://www.google.com/chrome‎" target="_blank"><img alt="Chrome" src="/media/images/browsers/chrome.png"/><br/><span>Chrome</span></a><td>
		<td><a href="http://www.opera.com/download/‎" target="_blank"><img alt="Opera" src="/media/images/browsers/opera.png"/><br/><span>Opera</span></a><td>
		<td><a href="http://support.apple.com/downloads/#safari" target="_blank"><img alt="Safari" src="/media/images/browsers/safari.png"/><br/><span>Safari</span></a><td>
		<td><a href="http://www.microsoft.com/fr-ca/download/details.aspx?id=40902" target="_blank"><img alt="Internet Explorer" src="/media/images/browsers/ie.png"/><br/><span>Internet<br>Explorer</span></a><td>
	</tr>
</table></div></div><![endif]-->

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Randy PooleCommented:
A simple way in JS, just call the following function:
function checkbrowser() 
{
        var ua = window.navigator.userAgent;
        var msie = ua.indexOf("MSIE ");
        var ver=0;
        if (msie > 0) ver=parseInt(ua.substring(msie + 5, ua.indexOf(".", msie))));
        if (ver<10 && ver>0) alert('Please upgrade your browser');
}

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GaryCommented:
Randy's comment is the only correct solution
IE11 removed the MSIE flag in the user agent string and Randy's code correctly identifies less than IE10 - though IE9 wasn't all that bad...

(no points for this - just pointing out the correct solution vs the junk and the reason why)
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Ray PaseurCommented:
If the example you posted is what you want, then the cut-paste from the example web page shows the design pattern that was used to create the popup window you saw in the example.  As usual with most computer programming projects, there are many ways to find a solution.

Best to all, over and out, ~Ray
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Nathan RileyFounderAuthor Commented:
Great thanks guys, how can I test this?  I have IE 11 so is there a website or anything to test web pages as IE 8 or 9?
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Nathan RileyFounderAuthor Commented:
I'm trying to use the IE dev tools to change it to IE 8 & 9, but not getting the popup.  I added the code to the page however.

http://alwaysvanilla.com/
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GaryCommented:
Randys code has an extra ) at the end

if (msie > 0) ver=parseInt(ua.substring(msie + 5, ua.indexOf(".", msie))));

...and you need to actually call the function.
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Nathan RileyFounderAuthor Commented:
Updated code, also called it on document ready, but still not getting the alert.
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GaryCommented:
Working fine for me in Dev Tools for IE9 and lower.
Be sure to do an hard refresh
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Nathan RileyFounderAuthor Commented:
Yeah just got the popup, working now thanks!
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