📄 ch5_examp6.htm
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<HTML>
<HEAD>
<SCRIPT LANGUAGE=JavaScript>
<!--
function getBrowserName()
{
var lsBrowser = navigator.appName;
if (lsBrowser.indexOf("Microsoft") >= 0)
{
lsBrowser = "MSIE";
}
else if (lsBrowser.indexOf("Netscape") >= 0)
{
lsBrowser = "NETSCAPE";
}
else
{
lsBrowser = "UNKNOWN";
}
return lsBrowser;
}
function getOS()
{
var userPlat = "unknown";
var navInfo = navigator.userAgent;
if ((navInfo.indexOf("windows NT") != -1)
|| (navInfo.indexOf("windows 95") != -1 )
|| (navInfo.indexOf("windows 98") != -1 )
|| (navInfo.indexOf("WinNT") != -1 )
|| (navInfo.indexOf("Win95") != -1 )
|| (navInfo.indexOf("Win98") != -1 ))
{
userPlat = "Win32";
}
else if(navInfo.indexOf("Win16") != -1)
{
userPlat = "Win16";
}
else if(navInfo.indexOf("Macintosh") != -1)
{
userPlat = "PPC";
}
else if(navInfo.indexOf("68K") != -1)
{
userPlat = "68K";
}
return userPlat;
}
function getBrowserVersion()
{
var findIndex;
var browserVersion = 0;
var browser = getBrowserName();
if (browser == "MSIE")
{
browserVersion = navigator.userAgent;
findIndex = browserVersion.indexOf(browser) + 5;
browserVersion = parseInt(browserVersion.substring(findIndex,findIndex + 1));
}
else
{
browserVersion = parseInt(navigator.appVersion.substring(0,1));
}
return browserVersion;
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE=JavaScript>
<!--
var userOS = getOS();
var browserName = getBrowserName();
var browserVersion = getBrowserVersion();
if (browserVersion < 4 || browserName == "UNKNOWN" || userOS == "Win16")
{
document.write("<H2>Sorry this browser version is not supported</H2>")
}
else if (browserName == "NETSCAPE")
{
location.replace("NetscapePage.htm");
}
else
{
location.replace("MSIEPage.htm");
}
//-->
</SCRIPT>
<NOSCRIPT>
<H2>This website requires a browser supporting scripting</H2>
</NOSCRIPT>
</BODY>
</HTML>
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