JavaScript has got this weird flaw, that if you forget to declare a
variable using the "var" keyword, the variable is declared in the
global scope instead of the current scope.
For example:
function foo() {
bar = 1;
var baz = 2;
}
foo();
console.log(bar);
// -> 1
console.log(baz);
// -> ReferenceError: baz is not defined
As a rule of thumb: Never declare a variable WITHOUT using the "var"
keyword. If you want to declare a global variable from inside a
function (which should be a sign you're doing something wrong), set it
as a property of the window object like so:
function foo() {
window.bar = 1;
}
foo();
console.log(bar);
// -> 1
You should really get yourself a couple of books on JavaScript. I'd
strongly suggest getting:
- JavaScript: The Definitive Guide, Fifth Edition by David Flanagan,
and
- JavaScript: The Good Parts by Douglas Crockford
There's also a number of good books on Prototype out there:
- http://prototypejs.org/2008/8/11/practical-prototype-and-scriptaculous,
and
-
http://prototypejs.org/2007/5/7/prototype-and-script-aculo-us-the-bungie-book-has-landed
Have fun!
Tobie
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