Fetching all (javascript) global variables in a page

Question

Is there a way to retrieve the names/values of all global variables on a page?

I would like to write a javascript function to do the following:

1. Find all global variables prefixed with 'xxx_' and stick them in an array (for e.g.)
2. build a query string using the name value pairs as follows: xxx_glob_var1=value1&xxx_glob_var2=value2 etc

How do I do this?

Answer 1

Or you could simply run;

Object.keys(window); 

It will show a few extra globals (~5), but far fewer than the for (var i in window) answer.

Object.keys is available in Chrome 5+, Firefox 4+, IE 9+, and Opera 12, ty @rink.attendant.6

Answer 2

Something like this:

function getGlobalProperties(prefix) {   var keyValues = [], global = window; // window for browser environments   for (var prop in global) {     if (prop.indexOf(prefix) == 0) // check the prefix       keyValues.push(prop + "=" + global[prop]);   }   return keyValues.join('&'); // build the string } 

A test usage:

var xxx_foo = "foo"; xxx_bar = "bar"; window.xxx_baz = "baz";  var test = getGlobalProperties('xxx_'); // test contains "xxx_baz=baz&xxx_bar=bar&xxx_foo=foo"