JavaScript: Browser Name and Version

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Browser Detection

To establish the actual name of the user's Web browser, we can use the navigator.appName and navigator.userAgent properties.

Firefox (and some other browsers) may return the string Netscape as the value of navigator.appName for compatibility with Netscape Navigator.
However, that navigator.userAgent may be spoofed, too – that is, clients may substitute virtually any string for their userAgent.

:P

//here is the source code that performed the browser detection:

var nVer = navigator.appVersion;
var nAgt = navigator.userAgent;
var browserName  = navigator.appName;
var fullVersion  = ''+parseFloat(navigator.appVersion); 
var majorVersion = parseInt(navigator.appVersion,10);
var nameOffset,verOffset,ix;

// In Opera, the true version is after "Opera" or after "Version"
if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
 browserName = "Opera";
 fullVersion = nAgt.substring(verOffset+6);
 if ((verOffset=nAgt.indexOf("Version"))!=-1) 
   fullVersion = nAgt.substring(verOffset+8);
}
// In MSIE, the true version is after "MSIE" in userAgent
else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
 browserName = "Microsoft Internet Explorer";
 fullVersion = nAgt.substring(verOffset+5);
}
// In Chrome, the true version is after "Chrome" 
else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {
 browserName = "Chrome";
 fullVersion = nAgt.substring(verOffset+7);
}
// In Safari, the true version is after "Safari" or after "Version" 
else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {
 browserName = "Safari";
 fullVersion = nAgt.substring(verOffset+7);
 if ((verOffset=nAgt.indexOf("Version"))!=-1) 
   fullVersion = nAgt.substring(verOffset+8);
}
// In Firefox, the true version is after "Firefox" 
else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {
 browserName = "Firefox";
 fullVersion = nAgt.substring(verOffset+8);
}
// In most other browsers, "name/version" is at the end of userAgent 
else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) < 
          (verOffset=nAgt.lastIndexOf('/')) ) 
{
 browserName = nAgt.substring(nameOffset,verOffset);
 fullVersion = nAgt.substring(verOffset+1);
 if (browserName.toLowerCase()==browserName.toUpperCase()) {
  browserName = navigator.appName;
 }
}
// trim the fullVersion string at semicolon/space if present
if ((ix=fullVersion.indexOf(";"))!=-1)
   fullVersion=fullVersion.substring(0,ix);
if ((ix=fullVersion.indexOf(" "))!=-1)
   fullVersion=fullVersion.substring(0,ix);

majorVersion = parseInt(''+fullVersion,10);
if (isNaN(majorVersion)) {
 fullVersion  = ''+parseFloat(navigator.appVersion); 
 majorVersion = parseInt(navigator.appVersion,10);
}

document.write(''
 +'browserName  = '+browserName+'<br>'
 +'majorVersion = '+majorVersion+'<br>'
 +'fullVersion  = '+fullVersion+'<br>'
 +'navigator.appName = '+navigator.appName+'<br>'
 +'navigator.userAgent = '+navigator.userAgent+'<br>'
)

Script Hasil Modif

function detectBrowser(){
  var nVer=navigator.appVersion;
  var nAgt=navigator.userAgent;
  var browserName =navigator.appName;
  var fullVersion =parseFloat(navigator.appVersion); 
  var majorVersion=parseInt(navigator.appVersion,10);
  var nameOffset,verOffset,ix;

  if((verOffset=nAgt.indexOf("Opera"))!=-1){
    browserName="Opera"; 
    fullVersion=nAgt.substring(verOffset+6);
    if((verOffset=nAgt.indexOf("Version"))!=-1){fullVersion=nAgt.substring(verOffset+8)}
  }else if((verOffset=nAgt.indexOf("MSIE"))!=-1){
    browserName="Microsoft Internet Explorer"; 
    fullVersion=nAgt.substring(verOffset+5);
  }else if((verOffset=nAgt.indexOf("Chrome"))!=-1){
    browserName="Chrome"; 
    fullVersion=nAgt.substring(verOffset+7);
  }else if((verOffset=nAgt.indexOf("Safari"))!=-1){
    browserName="Safari"; 
    fullVersion=nAgt.substring(verOffset+7);
    if((verOffset=nAgt.indexOf("Version"))!=-1){fullVersion=nAgt.substring(verOffset+8)}
  }else if((verOffset=nAgt.indexOf("Firefox"))!=-1){
    browserName="Firefox"; 
    fullVersion=nAgt.substring(verOffset+8);
  }else if( (nameOffset=nAgt.lastIndexOf(' ')+1) < (verOffset=nAgt.lastIndexOf('/')) ){
    browserName=nAgt.substring(nameOffset,verOffset); 
    fullVersion=nAgt.substring(verOffset+1);
    if(browserName.toLowerCase()==browserName.toUpperCase()){browserName=navigator.appName}
  }
  if((ix=fullVersion.indexOf(";"))!=-1){fullVersion=fullVersion.substring(0,ix)}
  if((ix=fullVersion.indexOf(" "))!=-1){fullVersion=fullVersion.substring(0,ix)}
  majorVersion=parseInt(fullVersion,10);
  if(isNaN(majorVersion)){
    fullVersion=parseFloat(navigator.appVersion); 
    majorVersion=parseInt(navigator.appVersion,10);
  }
  var tulis=browserName+' '+majorVersion;
  return tulis;
}

document.write(detectBrowser());