Checkbox to affect hidden field value

c_martini · October 15th, 2008, 08:52 AM

I have a form with a checkbox. I also have a hidden field in that form with a different name. I need to have the hidden field's value populated when the checkbox is checked. If the checkbox is then unchecked, the value of the hidden field should also be reset back to nothing.

Code:

<input type="checkbox" name="user_can_use_data" id="user_can_use_data" value=""  />

<input type="hidden" name="supplier_can_use_data" id="supplier_can_use_data" value="" />

I know a very simple bit of javascript should do the trick, but have not been able to figure it out...

Any ideas?

CloudedVision · October 15th, 2008, 10:33 PM

You know you don't need javascript for that:

Code:

<input type="checkbox" name="awesome" value="shtuff">

That will send "shtuff" when checked and nothing when not checked.

c_martini · October 16th, 2008, 04:42 AM

Quote:

Originally Posted by CloudedVision

You know you don't need javascript for that:

Code:

<input type="checkbox" name="awesome" value="shtuff">

That will send "shtuff" when checked and nothing when not checked.

Hmm. Think perhaps I wasn't clear about what I need. The hidden field is for a separate bit of info in the form. It needs to be there to submit a value for its name. The checkbox not only handles its own value, but should fill a checkbox value for the hidden field. Or unless a checkbox can be made to submit values for two different variables....

Does this make more sense? I know its something commonly done in forms but I am drawing a blank this week for some reason. Think I am working too much

CloudedVision · October 16th, 2008, 05:06 PM

I don't see why you need a seperate field for this. couldn't you do that server side?

Code:


			
if(isset($_POST['checkbox'])
$_POST['checkbox2'] = "Hello!";

You should try to steer away from something that only works with javascript - many people have javascript disabled. (Or sometimes if there's any javascript errors a browser will halt all javascript processes on the site. I believe IE6 does this.... although i may be wrong, ive given up on IE6 all together lol)

c_martini · October 17th, 2008, 04:31 AM

Quote:

Originally Posted by CloudedVision

I don't see why you need a seperate field for this. couldn't you do that server side?

Code:


			
if(isset($_POST['checkbox'])
$_POST['checkbox2'] = "Hello!";

You should try to steer away from something that only works with javascript - many people have javascript disabled. (Or sometimes if there's any javascript errors a browser will halt all javascript processes on the site. I believe IE6 does this.... although i may be wrong, ive given up on IE6 all together lol)

We don't use php on the servers in question. The language is proprietary. For this bit of functionality I don't have the option of making this server-side. Also, this site is for a chain of music stores and runs on thin clients connected to a main server via Citrix running Windows and IE6. The forms within the transaction processes have to be kept very simple so that staff in store can take customer orders fast and efficiently. The javascript functions are simply to make the whole process easier for staff to fill in the forms in front of customers.

Couldn't the one checkbox be made to set the same value for two, both itself and a second hidden field?

CloudedVision · October 17th, 2008, 05:26 PM

If use must use javascript, check out javascript checkboxes. http://homepage.ntlworld.com/kayseycarvey/jss3p8.html