array-name maes problems in function

[tobit]

hi

what is wrong?

if (document.lalalulu.bio_kat[1].selectedIndex == 0)


error: 'document.lalalulu.bio_kat.1' is null or not an object

what is wrong with this array name? when i use a normal name it works without anny probles.

tanks, ciao

[Khalid Ali]

Probably
bio_kat[1].
is not an array...or the index is not there,
post your code that generates this error

[tobit]

the array is a name of a <select> field (liek <select name="blablub[1]">).
that is because the name is dynamically produced, because the number of <select> fields is dynamic (i work with php).
when i use normal names it works, but wenn i use array names i doesnt.

[Khalid Ali]

my guess is that your select is not being assigned a name..make sure you do that...change your logic for nameing the select boxes.(probably)

[AdamGundry]

Here's something I stole from the PHP website (http://www.php.net/types.array):

Why array-style names won't work with Javascript is actually quite logical. If you take:

<input type="text" name="Settings[Name]">

as an example, then this JavaScript code:

document.forms.FormNameHere.elements.Settings[Name].value

won't work, of course! Name is an undefined constant in this case, as it's interpreted as a constant, not as a string... But adding quotes won't help you:

document.forms.FormNameHere.elements.Settings["Name"].value

Since the name="Settings[Name]" in the tag won't result in a "Settings"-subarray of the form.FormNameHere.elements array in the DOM.

The solution? Use this:

document.forms.FormNameHere.elements["Settings[Name]"].value

"Settings[Name]" is looked up in the elements array, and is found... The elements array is a hash, so strings can be used as keys!
Adam (sort of)

[pyro]

Originally posted by AdamGundry
Adam (sort of) lol... :D

[tobit]

thanks for that answer, AdamGundry.

it works perfectly.

ciao, tobit