How can I check webRTC datachannel compatibility using JavaScript in client side?

Question

WebRTC datachannel works only in Firefox nightly. How can I check it in client side?

Code is shown as follows;

if (/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ //test for Firefox/x.x or Firefox x.x (ignoring remaining digits); 

 var ffversion=new Number(RegExp.$1) // capture x.x portion and store as a number

 if (ffversion>=5)

  document.write("You're using FF 5.x or above")

 else if (ffversion>=4)

  document.write("You're using FF 4.x or above")

 else if (ffversion>=3)

  document.write("You're using FF 3.x or above")

 else if (ffversion>=2)

  document.write("You're using FF 2.x")

 else if (ffversion>=1)

  document.write("You're using FF 1.x")
}

else
 document.write("n/a")

Answer 1

You can simply test if the browser currently supports the features you're going to use. For example:

if (!window.mozRTCPeerConnection)
    // error, browser doesn't support it

If you're interested, here an interesting article: Hello Chrome, it’s Firefox calling!

You basically can implement the same feature in Chrome just using webkit prefix instead of moz.