Javascript check browser [duplicate]

Answer 1

I agree with with @Sirko. Preferably, you should use feature-detection instead. An alternative to to Modernizr would be jQuery's $.support() function. It's not exactly the same thing, but it may suit your needs.

If you insist on browser-detection, you can write your own script using jQuery's $.browser() function.

Answer 2

You can use navigator object for this and in that you can use userAgent property like

 if (navigator.userAgent.indexOf('Firefox') != -1 && parseFloat(navigator.userAgent.substring(navigator.userAgent.indexOf('Firefox') + 8)) >= 3.6){//Firefox
 //Allow
 }else if (navigator.userAgent.indexOf('Chrome') != -1 && parseFloat(navigator.userAgent.substring(navigator.userAgent.indexOf('Chrome') + 7).split(' ')[0]) >= 15){//Chrome
 //Allow
 }else if(navigator.userAgent.indexOf('Safari') != -1 && navigator.userAgent.indexOf('Version') != -1 && parseFloat(navigator.userAgent.substring(navigator.userAgent.indexOf('Version') + 8).split(' ')[0]) >= 5){//Safari
 //Allow
 }else{
 // Block
 }