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From: HerbF on 25 Apr 2010 20:47
I have a menu of radio buttons in a form I named form1. Each radio button
is named 'p1p6.' I store the value of which button is selected in an
array named 'edit_array.' When I try to select a button using data in the
array, as:

document.forms["form1"].elements["p1p6"][edit_array[3]].checked=true;

It throws an error: 'uncaught exception.' What am I doing wrong?

Herb
From: Stefan Weiss on 25 Apr 2010 21:03
On 26/04/10 02:47, HerbF(a)earthlink.net wrote:
> I have a menu of radio buttons in a form I named form1. Each radio button
> is named 'p1p6.' I store the value of which button is selected in an
> array named 'edit_array.' When I try to select a button using data in the
> array, as:
>
> document.forms["form1"].elements["p1p6"][edit_array[3]].checked=true;
>
> It throws an error: 'uncaught exception.' What am I doing wrong?

document.forms["form1"].elements["p1p6"]

is a NodeList (similar to an array of nodes). You need to access the
radio button you're interested in by its index (or with the item()
method), not by its value. I don't know the rest of your script, but
this might work:

document.forms["form1"].elements["p1p6"][3].checked = true;

BTW, if the form and element names are fixed (and valid JS identifiers),
you can also write the same line as

document.forms.form1.elements.p1p6[3].checked = true;


--
stefan
From: HerbF on 26 Apr 2010 01:30
Stefan Weiss wrote:

>On 26/04/10 02:47, HerbF(a)earthlink.net wrote:
>> I have a menu of radio buttons in a form I named form1. Each radio button
>> is named 'p1p6.' I store the value of which button is selected in an
>> array named 'edit_array.' When I try to select a button using data in the
>> array, as:
>>
>> document.forms["form1"].elements["p1p6"][edit_array[3]].checked=true;
>>
>> It throws an error: 'uncaught exception.' What am I doing wrong?
>
> document.forms["form1"].elements["p1p6"]
>
>is a NodeList (similar to an array of nodes). You need to access the
>radio button you're interested in by its index (or with the item()
>method), not by its value. I don't know the rest of your script, but
>this might work:
>
> document.forms["form1"].elements["p1p6"][3].checked = true;
>
>BTW, if the form and element names are fixed (and valid JS identifiers),
>you can also write the same line as
>
> document.forms.form1.elements.p1p6[3].checked = true;

edit_array[n] is the selected the radio button element, not [3]. IOW,
edit_array[3] is simply a stored value...not necessarily 3.
From: Stefan Weiss on 26 Apr 2010 01:48
On 26/04/10 07:30, HerbF(a)earthlink.net wrote:
> Stefan Weiss wrote:
>>On 26/04/10 02:47, HerbF(a)earthlink.net wrote:
>>> I have a menu of radio buttons in a form I named form1. Each radio button
>>> is named 'p1p6.' I store the value of which button is selected in an
>>> array named 'edit_array.' When I try to select a button using data in the
>>> array, as:
>>>
>>> document.forms["form1"].elements["p1p6"][edit_array[3]].checked=true;
>>>
>>> It throws an error: 'uncaught exception.' What am I doing wrong?
>>
>> document.forms["form1"].elements["p1p6"]
>>
>>is a NodeList (similar to an array of nodes). You need to access the
>>radio button you're interested in by its index (or with the item()
>>method), not by its value. I don't know the rest of your script, but
>>this might work:
>>
>> document.forms["form1"].elements["p1p6"][3].checked = true;
>>
>>BTW, if the form and element names are fixed (and valid JS identifiers),
>>you can also write the same line as
>>
>> document.forms.form1.elements.p1p6[3].checked = true;
>
> edit_array[n] is the selected the radio button element, not [3]. IOW,
> edit_array[3] is simply a stored value...not necessarily 3.

If edit_array[n] is an input element, you can just use it directly:

edit_array[n].checked = true;


--
stefan
From: HerbF on 26 Apr 2010 10:27
Stefan Weiss wrote:

>On 26/04/10 07:30, HerbF(a)earthlink.net wrote:
>> Stefan Weiss wrote:
>>>On 26/04/10 02:47, HerbF(a)earthlink.net wrote:
>>>> I have a menu of radio buttons in a form I named form1. Each radio button
>>>> is named 'p1p6.' I store the value of which button is selected in an
>>>> array named 'edit_array.' When I try to select a button using data in the
>>>> array, as:
>>>>
>>>> document.forms["form1"].elements["p1p6"][edit_array[3]].checked=true;
>>>>
>>>> It throws an error: 'uncaught exception.' What am I doing wrong?
>>>
>>> document.forms["form1"].elements["p1p6"]
>>>
>>>is a NodeList (similar to an array of nodes). You need to access the
>>>radio button you're interested in by its index (or with the item()
>>>method), not by its value. I don't know the rest of your script, but
>>>this might work:
>>>
>>> document.forms["form1"].elements["p1p6"][3].checked = true;
>>>
>>>BTW, if the form and element names are fixed (and valid JS identifiers),
>>>you can also write the same line as
>>>
>>> document.forms.form1.elements.p1p6[3].checked = true;
>>
>> edit_array[n] is the selected the radio button element, not [3]. IOW,
>> edit_array[3] is simply a stored value...not necessarily 3.
>
>If edit_array[n] is an input element, you can just use it directly:
>
> edit_array[n].checked = true;

No. Information is stored in a cookie. I read in the cookie and split its
content to form an array I am calling edit_array.

I want to use the value stored as edit_array[3] to select one of several
radio button input elements in a menu named p1p6.
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