[Javascript] Show and hide multiple div tags

[Triche Osborne]

Abyss - Information wrote:
> Yes I understand that.
> 
> I was just wondering (to which i will yahoo a ternary statement in a 
> minute)
> 
> why and how does it work with the? and the :
> 
The question mark is the ternary operator. Just as an equal sign (the 
assignment operator) is parsed by the interpreter as "store this piece 
of data at a place designated by this name," the question mark is 
intepreted as "if the statement that preceeds this question mark . . ." 
The question mark is always immediately followed by the true condition. 
The colon is the "else" and is always followed by the false branch.

If you could see it as the interpreter does, it would be something like 
this:

(1) var2 = var ? 'this' : 'that';
                ^ if var is

(2) var2 = var ? 'this' : 'that';
                    ^ TRUE, this

(3) var2 = var ? 'this' : 'that';
                         ^ else

(4) var2 = var ? 'this' : 'that';
                             ^ else FALSE, then this

(5) var2 = var ? 'this' : 'that';
       ^ assign results to var2


	As for the origins, I believe it comes from C, as do a number of 
constructs in both JavaScript and PHP. (PHP supports ternary form as 
well.) It's interesting to note that it isn't considered a complete 
statement in itself. The following isn't complete:

( var ) ? 'this' : 'that';

If must be used as part of a complete statement such as this one:

var2 = (var) ? 'this' : 'that';

The returned value must be assigned to something or used in some manner. 
Is this more what you were looking for?

Triche