Limit number of checkboxes selected.

[poleposters]

I have a form with around 20 checkbox choices presented to the user. However I only want to allow them to select a maximum of  10.

 

Is this something that can/should be done with PHP?

 

Also my problem becomes a little more complicated. I also want to include text inputs with the form so that users can enter their own choices. I would like to inlcude these "other" choices as part of the limit. Is there a way to do this?

 

 

Cheers.

 

 

[vbnullchar]

use javascripts

[genericnumber1]

If you want to check before they submit, use javascript. If you want to check after they submit (ideally you should do both or only php, just using JS without php isn't secure), set all the checkbox name attributes to something like "checkbox[]" and, on the script it submits to use the functions

count($_POST['checkbox']);

or

count($_GET['checkbox']);

(depending on your submission type). These will return the number of boxes checked.