[thelist] How can I pass a HTML "array" over to Javascript

[Stefan Schwarzer]

Hi there,

I have a kind of HTML array ("layer[]"), which appears a couple of  
times on my form. It is used so that a user can select multiple  
layers to be displayed on a map. So, this would be "cities",  
"national boundaries", "lakes", "rivers", etc.

It works fine. No problem with that.

Now, I would like, before passing the elements over to PHP, to do a  
quick check with Javascript which layers have been selected, in order  
to eliminate eventually one or to add another.

My function to do this looks like this:

                 function change_level()
                 {
                     lyr = new Array();
                     lyr = document.mapserv.layer;
                     for (i=0; i<lyr.length; i++)
                     {
			if (lyr[i] = "cities")
				... eliminate that layer
                     }
                 }

So, here I have a (actually two) problems. One is that I have no clue  
how the HTML element "layer" can be passed over to a Javascript- 
variable. And second I don't know how I can eliminate one element of  
that array.

There probably would be some possibility to get the checking done in  
PHP too, but the whole process behind the site is somewhat complex.  
So it would come in very handy, if this would be achievable through  
Javascript.

Can anyone help me out?

Thanks a lot!!

Stefan