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Get Browser Name and Version in Javascript

          JQuery stopped providing $.browser function after 1.9 release.So you have to write your own code to get know browser and its version.There is not standard procedure or code to achieve this.
But I will show you to get browser name and version of  IE > 6, Google Chrome And FF.

Here we have AGENT to rescue.Every browser has navigation object available in its script.In this object userAgent field contains current browser information.

So you can ask me What is User-Agent?How will it help us?
          As I said earlier it contain browser information.There is not standard to show each information but almost every browser support it.
    There is complicated history behind user-agent variable.But in simple sense we can say that user-agent is used by server side component to get information of client-side browser and its compatibility to page it will going to rendered.So we conclude that this user-agent information is little bit 50% same in all browser.
   
Why is it(user-agent) 50% same in all browser?
   Simple to cheat the server.Suppose we invented new browser and its user-agent information is different from all,what will happen?
    The server side component gets puzzled and it will think that our browser does not support  functionality.

Here some sample user-agent information.


IE 11 User-agent:
Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko 
 
G Chrome User-agent:
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.137 Safari/537.36
109 
 
FireFox User-agent:
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0
72
 
IE < 11 User-agent:
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0) 

Microsoft changed its  user agent information pattern from version 11.Here we have added support to all IE including IE 11.

So enough.We we shift to coding part.
In all user agent we have found some similar part and through which we will extract information.


var BrowserSupport = {
  init : function() {
    //get browser name
    this.browser = this.searchBrowserName(navigator.userAgent) || "N/A";
    //get browser version
    this.version = this.searchBrowserVersion(navigator.userAgent)
 || this.searchBrowserVersion(navigator.appVersion)
 || "0";},
 searchBrowserName : function(dataString) {
     var data=this.dataBrowser;
     for ( var i = 0; i < data.length; i++) {
 this.versionSearchString = data[i].versionSearch || data[i].identity;
 if (dataString) {
  //check browser name is present in BROWSER INFO string
    if (dataString.indexOf(data[i].subString) != -1)
   return data[i].identity;
    }
        }},
  searchBrowserVersion : function(dataString) {
     var index = dataString.indexOf(this.versionSearchString);
 if (index == -1)
  return;
     return parseFloat(dataString.substring(index+this.versionSearchString.length+ 1));
   },
   dataBrowser : [{
   subString : "Chrome",
   identity : "Chrome" //identity is Browser name
  }, {
   subString : "MSIE",
   identity : "Explorer", //identity is Browser name
   versionSearch : "MSIE"
  }, {
   subString : "Firefox",
   identity : "Firefox" //identity is Browser name
  },{
   subString : "Trident",//for IE 11
   identity : "Explorer",//identity is Browser name
   versionSearch : "rv" 
   }]};

You can call function like


BrowserSupport.init();
console.log(BrowserSupport.browser+" - "+BrowserSupport.version);

Thank you.

Reference:
http://www.w3schools.com/jsref/obj_navigator.asp

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