[thelist] javascript: ensuring that at least one radio button is selected

[joe]

Joel D Canfield wrote:

>I have two dozen radio buttons, named 'PrimaryIssue', all with different
>IDs/values. In this case, a default choice doesn't make sense. How do I
>ensure that at least one choice has been made?
>
>I've tried checking the value of 'PrimaryIssue', but that dinna work. I
>hate listing each ID separately. Is 'PrimaryIssue' an array I have to
>loop through?
>
>thanks
>
>joel
>  
>
hi joel

rather than use js, can't you just ensure one of them is selected by 
adding 'checked' to the first radio button?  or I guess that's what you 
mean by 'default choice doesn't make sense'...   otherwise you can loop 
through the array:

myArray = document.forms['formName'].PrimaryIssue;
for (a = 0; a < myArray.length; a++)
    {
    if (myArray[a].checked)
        {
        myChecked = true;
        }
    }
if (!myChecked)
    {
    // do what you gotta do
    }

joe