Modifying form data before submission

[Logical]

I have a form which houses basic inputs, as well as a few multiple select
forms.

I need to parse all the 'values' which are in this multiple select form (it
gets manipulated dynamically client side). I wanted to create a function
that loops through all the form elements, and if the type 'select-multiple'
is detected, gather the VALUES of each <option> inside it.

The bit I'm stuck on is then how to reconstruct this into a form submission.
Preferably I wanted the data from the 'select-multiple' element to be
submitted as comma delimited, eg 14,12,512,63,62 which would later be parsed
by PHP.

I was considering reconstructing a query string and submitting that as GET,
but I'd prefer to POST it along with the other data (such as INPUTS etc)
which do not need to be changed.

Can I somehow attach some 'hidden' type data onto the end of the form
submission at this point?

Thanks in advance

[Chris Wright]

Re: Modifying form data before submission

On Fri, 25 Jul 2003 17:43:45 +1000, "Logical" <logic@privacy. net>
wrote:
[color=blue]
>I have a form which houses basic inputs, as well as a few multiple select
>forms.
>
>I need to parse all the 'values' which are in this multiple select form (it
>gets manipulated dynamically client side). I wanted to create a function
>that loops through all the form elements, and if the type 'select-multiple'
>is detected, gather the VALUES of each <option> inside it.
>
>The bit I'm stuck on is then how to reconstruct this into a form submission.
>Preferably I wanted the data from the 'select-multiple' element to be
>submitted as comma delimited, eg 14,12,512,63,62 which would later be parsed
>by PHP.
>
>I was considering reconstructing a query string and submitting that as GET,
>but I'd prefer to POST it along with the other data (such as INPUTS etc)
>which do not need to be changed.
>
>Can I somehow attach some 'hidden' type data onto the end of the form
>submission at this point?
>[/color]
Check the Netscape JavaScript site at http://devedge.netscape.com/
and look at the CFormData JAvaScript object.

That might do the trick for you.

[DWilliams]

Re: Modifying form data before submission

First off, it's not really clear to me if you want the selected values from
a multiple select element, or just all of the values regardless of selection
state. In the case of the former (selected), you can just re-name your
multiple select element using this syntax:

<select name="manyselec ts[]" size="10" multiple="multi ple">

That can be parsed/interpreted because it is already construed as an array
by PHP...

echo print_r($_POST['manyselects']);

In the case of the latter, you would have to implement a javascript
construct to loop through the select elements on the form before submittal
to collect the values. Perhaps something like the following...(un tested)

The intention would be to get a comma separated string for all the
multiple-select option values. You could then perhaps assign that value to
a hidden form variable:


function processMultiple s() {
var thisSelect;
var multiValues;
var theForm = window.document .forms[0];

for (var i = 0; i < theForm.length; i ++) {
if (theForm.elemen ts[i].type == "select-multiple") {
thisSelect = theForm.element s[i];
for (var j = 0; j < thisSelect.leng th; j ++)
multiValues += thisSelect.opti ons[j].value + ',';
}
}

// strip last comma
multiValues = multiValues.sub str(0, multiValues.len gth - 1);

return multiValues;
}


--
HTH,
DWilliams

"Logical" <logic@privacy. net> wrote in message
news:bfqmp5$h77 qg$1@ID-159445.news.uni-berlin.de...[color=blue]
> I have a form which houses basic inputs, as well as a few multiple select
> forms.
>
> I need to parse all the 'values' which are in this multiple select form[/color]
(it[color=blue]
> gets manipulated dynamically client side). I wanted to create a function
> that loops through all the form elements, and if the type[/color]
'select-multiple'[color=blue]
> is detected, gather the VALUES of each <option> inside it.
>
> The bit I'm stuck on is then how to reconstruct this into a form[/color]
submission.[color=blue]
> Preferably I wanted the data from the 'select-multiple' element to be
> submitted as comma delimited, eg 14,12,512,63,62 which would later be[/color]
parsed[color=blue]
> by PHP.
>
> I was considering reconstructing a query string and submitting that as[/color]
GET,[color=blue]
> but I'd prefer to POST it along with the other data (such as INPUTS etc)
> which do not need to be changed.
>
> Can I somehow attach some 'hidden' type data onto the end of the form
> submission at this point?
>
> Thanks in advance
>
>
>[/color]