not checked checkboxes input are not sent by the browser

[lehmann]

Hello,

I discovered that in a form with checkboxes input, if the checkboxe is
not checked, not value is sent in my request by the browser (at least
IE, I think it is ok in NS).
But I my application I need to get the input even if it is not checked
(my form is dynamic and I distinguish the cases: input exists and is
cheched / input exists ans is not checked / input doesn't exists)
I know I could use another input such as textfield, but I wonder if
there is another solution that would allow me to keep the checkboxe
and send it even if not checked.
Thanks for any help!
G.

[David Dorward]

Re: not checked checkboxes input are not sent by the browser

lehmann wrote:
[color=blue]
> Hello,
>
> I discovered that in a form with checkboxes input, if the checkboxe is
> not checked, not value is sent in my request by the browser (at least
> IE, I think it is ok in NS).[/color]

Its "OK" in all browsers.

Unchecked checkboxes are not submitted, that is how it is supposed to work.
[color=blue]
> But I my application I need to get the input even if it is not checked[/color]

Then test for the _existance_ of the variable rather then its value.
[color=blue]
> (my form is dynamic and I distinguish the cases: input exists and is
> cheched / input exists ans is not checked / input doesn't exists)[/color]

Then you should include an input that specifies which checkboxes exist.

--
David Dorward http://david.us-lot.org/
Redesign in progress: http://stone.thecoreworlds.net/
Microsoft announces IE is dead (so upgrade):

http://minutillo.com/steve/weblog/2003/5/30/microsoft-announces-ie-is-dead

[Daniel]

Re: not checked checkboxes input are not sent by the browser

> But I my application I need to get the input even if it is not checked[color=blue]
> (my form is dynamic and I distinguish the cases: input exists and is
> cheched / input exists ans is not checked / input doesn't exists)
> I know I could use another input such as textfield, but I wonder if
> there is another solution that would allow me to keep the checkboxe
> and send it even if not checked.[/color]

You say it's dynamic, so just in case it's anything like mine - I'm doing
something with PHP & MySQL, this is what I did. I put a hidden field in the
form and link it to the checkbox, like this (a checkbox to click whether or
not a user's address should be visible on my site):

<input name="showaddre ssControl" type="checkbox" id="showaddress Control"
value="showaddr essControl" onClick="this.f orm.showaddress .value =
((this.checked) ?1:0)">
<input name="showaddre ss" type="hidden" value=""
onChange="this. form.showaddres sControl.checke d =
((this.value==1 )?true:false)">

The first input is the checkbox, and when it's clicked, it sets the hidden
value to 1 (MySQL for TRUE) if the checkbox is checked, and 0 (FALSE) if
it's not.

The second input is the actual value that I get and put from/to the
database. The reason I have an onchange handler in it is that I dynamically
fill it with data on different persons, so whenever its value changes, the
checkbox is changed too to reflect the new value. You could give it a
default value of "null" or "not set" or something to show when 'input
doesn't exist').

Hope this has something to do with what you're doing and that it will help
;)

Cheers,
Daniel


--
There are 10 kinds of people: Those who know binary and those who don't.

[lehmann G.]

Re: not checked checkboxes input are not sent by the browser



Your solution seems perfect for me!
Thanks a lot!!! :-)
G

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