- From: Sailesh Panchang <sailesh.panchang@deque.com>
- Date: Mon, 14 Apr 2008 14:17:18 -0400
- To: "'Aaron M Leventhal'" <aleventh@us.ibm.com>
- Cc: <wai-xtech@w3.org>, <wai-xtech-request@w3.org>
- Message-ID: <48039d88.43e2220a.7639.fffffe6a@mx.google.com>
In reality a 3-state checkbox is a poorly designed control. In the example with a tree control and checkbox / radio buttons for underlying components, the installation process might require the user to indicate selections against all components (mandatory). Or it may not be mandatory in which case default selections would be used I assume. If it is mandatory, it does not matter if the user has not indicated selections against 1 or all components. Till all are indicated, the state of the parent control is incomplete or unchecked. A more useful state for a parent control of this nature would be one which indicates count (out of a max possible) that are answered like 7/12 i.e. 7 have been answered and 5 are unanswered. Radio and checkbox controls are essentially boolean and should be retained that way. Microsoft regards a tri-state checkbox is a group of three radio buttons, two of which represent the false and the true states and a third which stands for the undefined state. Not sure why this is needed. A null value is returned for the undefined state anyway. Not sure if this is open for debate here. Sailesh _____ From: Aaron M Leventhal [mailto:aleventh@us.ibm.com] Sent: Monday, April 14, 2008 10:20 AM To: sailesh.panchang@deque.com Cc: wai-xtech@w3.org; wai-xtech-request@w3.org Subject: RE: Style guide: tristatecheckbox Salesh, It's not common, but here is a use case on the desktop today: In an installer, you may have a tree view of components to select. Each item in the tree view is a tristate checkbox. If only some of the some items are checked, then the checkbox is shown as "mixed". - Aaron "Sailesh Panchang" <sailesh.panchang@deque.com> Sent by: wai-xtech-request@w3.org 04/14/2008 04:24 PM Please respond to <sailesh.panchang@deque.com> To Aaron M Leventhal/Cambridge/IBM@IBMUS, <wai-xtech@w3.org> cc Subject RE: Style guide: tristatecheckbox I question the concept of a partially checked checkbox. Checkbox and radio buttons are meant to hold just the 2 boolean values: yes or no. If one can have a 3 state checkbox (to correspond to Yes, No, Not sure), then why not a 5 state checkbox (that corresponds with something like Strongly agree, Agree, Not decided, Disagree, Strongly disagree)? Sailesh Panchang Accessibility Services Manager (Web and Software) Deque Systems Inc. (www.deque.com) 11130 Sunrise Valley Drive, Suite #140, Reston VA 20191 Phone: 703-225-0380 (ext 105) E-mail: sailesh.panchang@deque.com _____ From: wai-xtech-request@w3.org [mailto:wai-xtech-request@w3.org] On Behalf Of Aaron M Leventhal Sent: Friday, April 11, 2008 6:11 AM To: wai-xtech@w3.org Subject: Style guide: tristatecheckbox The below definition conflicts with itself. If the item is partially checked, space rotates through checked, unchecked and then partially checked again. However, the first bullet says if it's not checked that space checks it! Is the implementation supposed to have 2 different code paths for unchecked checkboxes depending on whether it was originally partially checked? - Aaron * Three State Check Box * If not checked, space checks the check box * If checked, space unchecks the check box * If partially checked, space will rotate through checked, unchecked, and partially checked states.
Received on Monday, 14 April 2008 18:09:00 UTC