Javascript version 1.8

Posted on 2013-06-24
Medium Priority
Last Modified: 2013-07-05
Is it possible to identify what version the javascript is being programmed by looking at the web page source code?  I would think that knowing of a certain construct used in version 1.8 and that construct being used on that web page, that one could determine what version was being used.
Is there an easier way?

How much information can be gather from a statement like this;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

I see that the DTD is xhtml, but is there more?
Question by:chima
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Expert Comment

by:Manuel Marienne-Duchêne
ID: 39273890
may be you want to talk Jquery a librairy for javascript :

LVL 84

Assisted Solution

by:Dave Baldwin
Dave Baldwin earned 500 total points
ID: 39273909
You can see the version of the jQuery library in the source code of a page.  But javascript itself is part of the browser and is not generally available separately and neither is the version of it.  Current versions of javascript in browsers are based on ECMAscript.  More info here: https://en.wikipedia.org/wiki/ECMAScript
LVL 59

Assisted Solution

by:Julian Hansen
Julian Hansen earned 300 total points
ID: 39273916
I am assuming you mean JQuery not Javascript

You can check the version like so
var ver = $().jquery;
alert (ver);

Open in new window

Build and deliver software with DevOps

A digital transformation requires faster time to market, shorter software development lifecycles, and the ability to adapt rapidly to changing customer demands. DevOps provides the solution.

LVL 35

Assisted Solution

by:Robert Schutt
Robert Schutt earned 600 total points
ID: 39274071
Assuming you do mean javascript, seems the way to do it is to include the version in the script tag so it's clear for people (and browsers), as shown here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/1.8 

I'm not sure what is supposed to happen when a browser doesn't support the new version, probably ignore the entire script block.

Accepted Solution

Sar1973 earned 600 total points
ID: 39274274
Are you looking for navigator properties? See http://www.w3schools.com/js/tryit.asp?filename=try_nav_all
LVL 59

Assisted Solution

by:Julian Hansen
Julian Hansen earned 300 total points
ID: 39274420
Having re-read your question
s it possible to identify what version the javascript is being programmed by looking at the web page source code?
Are you asking what version the author decided to use or what version is supported by the browser?
From the rest of your question it seems you are trying to work out something about the page and how it was developed.

Maybe tell us what it is you are trying to do - why you need this information - and we might be better able to help you.

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Find out what you should include to make the best professional email signature for your organization.
A while back, I ran into a situation where I was trying to use the calculated columns feature in SharePoint 2013 to do some simple math using values in two lists. Between certain data types not being accessible, and also with trying to make a one to…
In this tutorial viewers will learn how to style a corner ribbon overlay for an image using CSS Create a new class by typing ".Ribbon":  Define the class' "display:" as "inline-block": Define its "position:" as "relative": Define its "overflow:" as …
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.

718 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question