View source for Allowing Only One Check Box to be Selected

To prevent a user from selecting more than one Check Box for the associated [[Custom Field]], add this code to the '''HTML Tag''' section of the [[Custom Field]]:

 onclick="onlyonechecked(this)"

'''NOTE: It is normally better to use a [[Combo Box]] custom field with ''Show as Radio Buttons'' selected'''


This can be used for:

* [[Custom Field Type: Select Many – Check Boxes|Select Many - Check Box]] <!--
*: and
* [[Custom Field Type: Select Many – Scrolling Check Box|Select Many - Scrolling Check Box]] -->

The [[User|user]] will not be able to select more than a single check box with this code in place.

For a [[Custom Field Type: Select One – Combo Box|Select One - Combo Box]] field, the "Show as Radio Buttons" option can be selected to display the field selections as "radio buttons."

==Note==
* If using '''onlyonechecked''' on a [[Custom Field Type: Select Many – Check Boxes|Select Many - Check Box]] field and you also want to [[Show/Hide Header]] you should use '''_showhideheader''' instead of '''_showhideheadercheckbox'''


[[Category: Custom Fields]][[Category:JavaScript]]