SOS: Form SelectedIndex autochange script

[Samuell]

Hi,
im actually not an js coder, so i spent a few hours to find script i need but looks like there are no such script
i currently use this stuff -
[w3schools.com ]
so what i need is to make that fields in the box go automatically from first to the last then first again and so on until i choose some field manually.
i tried things like this

function roller() {
for (i=0;i<3;i++) { setTimeout("roll(i)", 3000) }
}
function roll(i) { document.usersform.users[i].selected = "1" }

but it jumps to last field and do not show any of previuos fields. and its do not affect mysql select action so nothing is really happens.
so, is there are any chances to expand that script this way?
thanks in advance

[fside]

Aren't you setting the timeout on all three for the same instant? Timeout or interval to a function that steps through.

[Samuell]

ok, one nice guy provide me this upgrade

function roller() {
var total=3;//number of options
 for (var i=0;i<total;i++) { 
 setTimeout("roll("+i+")", (3000*(i+1)));
 }
 setTimeout("roller()", (3000*total));
}
function roll(i) { 
 document.usersform.users[i].selected = "1";
}

and now its rolls, but its still not affect function inside onchange event of the form, so nothing is happens, its strange couse i thought it should affect
and i have no idea how to stop this rolling

any ideas?

[Samuell]

ok, i find out why onchange handler of the form do not react on SelectedIndex change - its just can't be trigered this way, so i'm trying to use

document.usersform.users[i].fireEvent("onchange")

instead of

document.usersform.users[i].selected = "1";

but its still don't work and couse an error, so
what is wrong now and how i can make it work?
please, anybody!

[edited by: Samuell at 8:24 pm (utc) on Feb. 17, 2008]

[whoisgregg]

I believe the onchange event is attached to the <select>, not the <option>.

And, you probably need to set .selected = "1" then fire the onchange... Something along these lines:

function roll(i) { 
document.usersform.users[i].selected = "1"; 
document.usersform.users.onchange(); 
}