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Full Script

After the version is extracted, you must use the

compareVersions()

function (explained in a previous

section) to determine the minimum operating system versions:

if (isUnix) {

isSunOS = sUserAgent.indexOf(“SunOS”) > -1;

if (isSunOS) {

var reSunOS = new RegExp(“SunOS (\\d+\\.\\d+(?:\\.\\d+)?)”);

reSunOS.test(sUserAgent);

isMinSunOS4 = compareVersions(RegExp[“$1”], “4.0”) >= 0;

isMinSunOS5 = compareVersions(RegExp[“$1”], “5.0”) >= 0;

isMinSunOS5_5 = compareVersions(RegExp[“$1”], “5.5”) >= 0;

}

With that, you can now use

isSunOS

isMinSunOS4

isMinSunOS5

, and

isMinSunOS5_5

Of course, all this knowledge of browsers and operating systems is useless unless you can come up with

a practical way to use it.

The Full Script

The entire script is listed here for your convenience. Note that the order in which the various checks

appear is very important. The complete script should be stored in a JavaScript such as detect.js.

var sUserAgent = navigator.userAgent;

var fAppVersion = parseFloat(navigator.appVersion);

function compareVersions(sVersion1, sVersion2) {

var aVersion1 = sVersion1.split(“.”);

var aVersion2 = sVersion2.split(“.”);

if (aVersion1.length > aVersion2.length) {

for (var i=0; i < aVersion1.length - aVersion2.length; i++) {

aVersion2.push(“0”);

}

} else if (aVersion1.length < aVersion2.length) {

for (var i=0; i < aVersion2.length - aVersion1.length; i++) {

aVersion1.push(“0”);

}

for (var i=0; i < aVersion1.length; i++) {

if (aVersion1[i] < aVersion2[i]) {

return -1;

} else if (aVersion1[i] > aVersion2[i]) {

return 1;

}

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Browser and Operating System Detection

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