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    <p>The standard way to detect what browser is used is to check the user agent supplied.</p> <pre><code>var BrowserDetect = { init: function () { this.browser = this.searchString(this.dataBrowser) || "An unknown browser"; this.version = this.searchVersion(navigator.userAgent) || this.searchVersion(navigator.appVersion) || "an unknown version"; this.OS = this.searchString(this.dataOS) || "an unknown OS"; }, searchString: function (data) { for (var i=0;i&lt;data.length;i++) { var dataString = data[i].string; var dataProp = data[i].prop; this.versionSearchString = data[i].versionSearch || data[i].identity; if (dataString) { if (dataString.indexOf(data[i].subString) != -1) return data[i].identity; } else if (dataProp) return data[i].identity; } }, searchVersion: function (dataString) { var index = dataString.indexOf(this.versionSearchString); if (index == -1) return; return parseFloat(dataString.substring(index+this.versionSearchString.length+1)); }, dataBrowser: [ { string: navigator.userAgent, subString: "Chrome", identity: "Chrome" }, { string: navigator.userAgent, subString: "OmniWeb", versionSearch: "OmniWeb/", identity: "OmniWeb" }, { string: navigator.vendor, subString: "Apple", identity: "Safari", versionSearch: "Version" }, { prop: window.opera, identity: "Opera" }, { string: navigator.vendor, subString: "iCab", identity: "iCab" }, { string: navigator.vendor, subString: "KDE", identity: "Konqueror" }, { string: navigator.userAgent, subString: "Firefox", identity: "Firefox" }, { string: navigator.vendor, subString: "Camino", identity: "Camino" }, { // for newer Netscapes (6+) string: navigator.userAgent, subString: "Netscape", identity: "Netscape" }, { string: navigator.userAgent, subString: "MSIE", identity: "Explorer", versionSearch: "MSIE" }, { string: navigator.userAgent, subString: "Gecko", identity: "Mozilla", versionSearch: "rv" }, { // for older Netscapes (4-) string: navigator.userAgent, subString: "Mozilla", identity: "Netscape", versionSearch: "Mozilla" } ], dataOS : [ { string: navigator.platform, subString: "Win", identity: "Windows" }, { string: navigator.platform, subString: "Mac", identity: "Mac" }, { string: navigator.userAgent, subString: "iPhone", identity: "iPhone/iPod" }, { string: navigator.platform, subString: "Linux", identity: "Linux" } ] }; BrowserDetect.init(); </code></pre> <p><a href="http://www.quirksmode.org/js/detect.html" rel="noreferrer">http://www.quirksmode.org/js/detect.html</a></p>
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    1. POWhat is the Best way to do Browser Detection in Javascript?
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    1. CO+1 as this is the one answer most likely to actually help him with his assignment.
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      1. USPaolo Bergantino
    2. COUA based checking is poor in general, as you end up blocking browsers regardless of whether they fix bugs or not, don't work with new browsers, etc. A great example is that Chrome has to spoof as Safari for a number of sites due to sites that whitelist good browsers, vs. blacklisting the bad.
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    3. CO@Olliej: You are going to vote down an answer that specifically applies to the question at hand, when the question itself is a homework assignment. I highly doubt the teacher is going to be happy when the student comes back and says "you shouldn't do it that way" instead of doing what he was told.
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