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PODetect IE version (prior to v9) in JavaScript
 

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    <p>I want to bounce users of our web site to an error page if they're using a version of <code>Internet Explorer</code> prior to v9. It's just not worth our time and money to support <code>IE pre-v9</code>. Users of all other non-IE browsers are fine and shouldn't be bounced. Here's the proposed code:</p> <pre><code>if(navigator.appName.indexOf("Internet Explorer")!=-1){ //yeah, he's using IE var badBrowser=( navigator.appVersion.indexOf("MSIE 9")==-1 &amp;&amp; //v9 is ok navigator.appVersion.indexOf("MSIE 1")==-1 //v10, 11, 12, etc. is fine too ); if(badBrowser){ // navigate to error page } } </code></pre> <p>Will this code do the trick?</p> <p>To head off a few comments that will probably be coming my way:</p> <ol> <li>Yes, I know that users can forge their <code>useragent</code> string. I'm not concerned.</li> <li>Yes, I know that programming pros prefer sniffing out feature-support instead of browser-type but I don't feel this approach makes sense in this case. I already know that all (relevant) non-IE browsers support the features that I need and that all <code>pre-v9 IE</code> browsers don't. Checking feature by feature throughout the site would be a waste.</li> <li>Yes, I know that someone trying to access the site using <code>IE v1</code> (or >= 20) wouldn't get 'badBrowser' set to true and the warning page wouldn't be displayed properly. That's a risk we're willing to take.</li> <li>Yes, I know that Microsoft has "conditional comments" that can be used for precise browser version detection. IE no longer supports conditional comments as of <code>IE 10</code>, rendering this approach absolutely useless.</li> </ol> <p>Any other obvious issues to be aware of?</p>
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    1. USChad Decker
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    1. CO"It's just not worth our time and money to support IE pre-v9". I wish I could do that.
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    2. COBased on point [2] I won't suggest Modernizr (http://en.wikipedia.org/wiki/Modernizr) - everyone has to draw a line in the sand somewhere - but IE9 does seem like a high line
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    3. CO@Hassan: We have a small captive audience. Virtually all users are using decent browsers except for a few WinXP guys who are ineligible to upgrade to IE9. Those are the dudes that I'm targeting with this error message.
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