hiding and displaying an option element using JavaScript

[John Fitzgibbon]

Hi,

Hi,

I need to hide a number of option elements in one drop down list based
on the user selecting an option in another drop down list.

The Javascript code I'm using is

document.getElementById('starts4').style.display='none';

where 'starts4' is the id of the option element I'm trying to hide. I
tried using a span element within the option element and giving it an id
of 'starts4' but to no avail.

If the element is not an option element, everything works fine. The
element appears and reappears as required.

Using 

document.frmNameSearch.elements[4].options[1]=null

is too messy, in this case, because it changes the index numbers of the
option elements within the options array. Several options have to vanish
and reappear depending on what is clicked and the changing of the index
numbers makes it difficult to keep track of everything.

If the first approach could be made to work it would save a great deal
of typing.

Any ideas would be very welcome. 

John Fitzgibbon

Galway Public Library
Island House
Cathedral Square
Galway
Ireland

p: 00 353 91 562471
f: 00 353 91 565039
w: http://www.galwaylibrary.ie 

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