>- see footer for list info -<
> > > I want to be able to set defaults for width/height in this
function in
> > > case my link doesn't contain these params. How do I specify this
in the
> > > function?
> >
> > if (arguments.length != 3) { ... }
>
> ... or ...
>
> if(!sWidth) { ... }
Or:
function foo(a, b) {
a = a || 123; // default a to 123
b = b || "b"; // default a to "b"
// ...
}
Or:
function foo(a, b) {
a = typeof(a) != 'undefined' ? a : 123; // default a to 123
b = typeof(b) != 'undefined' ? b : "b"; // default b to "b"
// ...
}
Ask 10 people, get 10 different answers :)
I find the top syntax looks the cleanest (a || b), but that doesn't work
for boolean values, or values that could be treated as boolean (anything
that evaluates as a boolean value will get 'defaulted') -- the same goes
for SteveD's solution (if (!arg) {...}).
In general, it's the 2nd style (using typeof) here's that's most
commonly used.
Here's some other people's opinions:
http://web-graphics.com/mtarchive/001709.php
http://experts.about.com/q/Javascript-1520/Default-parameter-value-funct
ion.htm
http://parentnode.org/javascript/default-arguments-in-javascript-functio
ns/
Etc...
Tim.
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