[Javascript] Javascript - radio buttons error
Abyss
info at abyss.ws
Sun Mar 27 16:13:14 CST 2005
Wow..thank you....that is great!
your the first person (and only person) to explain about the DOM which
really helped...
I really appreciate that help....
" As Netscape's original JavaScript spec helpfully states" do you know where
i can get a copy of that spec?
Abyss
PS Thanks again...heaps
----- Original Message -----
From: "Andrew Clover" <and-babble at doxdesk.com>
To: <javascript at LaTech.edu>
Sent: Sunday, March 27, 2005 2:15 PM
Subject: Re: [Javascript] Javascript - radio buttons error
> > but for some reason it does not work if there is only 1 radio
> > button on the form...can anyone tell me why?
>
> Because the JS (DOM Level 0) Form interface is badly designed.
>
> var f= document.getElementById('someform');
> var el= f.elements.elname;
>
> If there is one field with name="elname", el will be an HTMLInputElement.
> If there is more than one, el will be an Array of HTMLInputElements. As
> Netscape's original JavaScript spec helpfully states:
>
> You need to be aware of this situation in your code and know whether
> myField refers to a single element or to an array of elements.
>
> One way of guessing which is the case is to check for the existence of a
> 'length' attribute and assume that we have a single input if it's
> undefined. This works as long as no-one starts adding 'length' properties
> to form field objects. For example:
>
> // Get list of field elements by name - always return Array/NodeList
> //
> function getFieldsByName(form, name) {
> var el= form.elements[name];
> if (!el) return new Array();
> if (!el.length) return new Array(el);
> return el;
> }
>
> --
> Andrew Clover
> mailto:and at doxdesk.com
> http://www.doxdesk.com/
> _______________________________________________
> Javascript mailing list
> Javascript at LaTech.edu
> https://lists.LaTech.edu/mailman/listinfo/javascript
>
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