[Javascript] Form field arrays in IE 5+

[Chris Tifer]

Peter, so what exactly is it you're trying to do? Is this part of a function
that's called when someone tries to submit a form? When the element
loses focus?  Through an onChange event?

The reason I ask is because I'll give you some code that'll work, but the
basic problem you're having is that you're grabbing one element at a time.
Now when you check the length of that, naturally, it's only one element.

Now if you were to do something like this once you came across a
radio collection (or checkbox):

var objArrEl = document.mainForm.elements[currentField.name]

THEN you'd have an array of elements since your code was initially
wanting to only look at one particular element and this is saying "Let's
look at all the elements with this name"..

Get my drift?

Chris Tifer
http://emailajoke.com


----- Original Message -----
From: "Peter Brunone" <peter at brunone.com>
To: <javascript at latech.edu>
Sent: Thursday, April 24, 2003 1:00 PM
Subject: [Javascript] Form field arrays in IE 5+


> I could've sworn I've done this before.
>
>    I'm looping through a form's elements, and when I get to a radio button
or checkbox, I want to determine whether any options are checked.  Now, as
far as I can remember, if you have a radio/checkbox collection with all
elements named the same, then you can treat it as an array... BUT, for some
reason, IE is still acting as if each of them is a separate entity, which
really gives me no way to tie them together.  Below is a sample piece of
script I'm using to get the pieces, but the browser refuses to believe that
four <input type="radio"> with the same name are really pieces of one
collection.
>
>     for(var i=0;i<document.mainForm.elements.length;i++) {
>         if(currentField.type == "text") {
>             if(currentField.value == "") { isValid = 0 }
>             }
>         else if(currentField.type == "radio") {
>             isChecked = 0;
>             j = 0;
>             for(var j=0;j<currentField.length;j++) {
>                 if(currentField[j].checked == true) {isChecked = 1}
>                 alert(currentField.value + " " + currentField.checked); //
Debugging
>                 }
>             if(isChecked == 0) { isValid = 0 }
>             }
>         }
>
> What am I missing?
>
> Cheers,
>
> Peter
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