CheckBox: support required=true

[nonken]

In some use-cases you want checkboxes to be required to be checked. Typical example is "do you agree to these license terms?" in an install wizard.

Also wondering about radio field. Are there cases where you first set no checked value and then have a required one?

[bill]

Marking for consideration for 1.2. This is probably a dojox.form thing more than a dijit thing? Not sure.

[nonken]

I'd keep it in dijit since this functionality is quite essential for form handling. The above use cases appear on almost every site which deals with usersignups, sales or other e-commerce

[nathan]

I tend to agree - I don't think this is so much a "new" widget as a mechanism for adding support for isValid and validate to the existing widget.

[guest]

I made some suggestions about CheckBox? enhancements on #6388. I think adding validate, isValid, and required would be valuable for checkboxes. They should also have an errorMessage attribute, which is displayed next to the checkbox when it's invalid.

[Nathan Toone]

Unassigning my tickets.

[dylan]

Is this really not yet supported by dijit/Form?

[bill]

The question doesn't really make sense. Widgets support their own "required" flag.

It's not possible to do that for CheckBox etc. in 1.9 given that there's no place for an exclamation mark invalid icon to be displayed as part of the widget, but something to reconsider for 2.0, so leaving this open.

[dylan]

Bill, have you addresses this with Delite/Deliteful?? Can we close this out as patchwelcome?

[bill]

It's not addressed in deliteful, but we can close as patchwelcome.

[gaxweb]

The only problem here is showing a visual indication. Maybe the label should be part of the widget, so you have something to work with? How often do you use a checkbox without a label? Exactly. But wrap it around the checkbox, don't use an extra one. Makes layout much easier and less error prone.

HTML5 forms show a tooltip, pointing at the checkbox btw.

Nonetheless, I think it's worth it to at least support the required flag along with a validate() method, so you can at least wrap a Form widget around the checkboxes, so the form's validate() method will automatically (the form calls each widget's validate() method already: ​https://github.com/dojo/dijit/blob/master/form/_FormMixin.js#L72) consider them during validation. That would at least put them on equal footing with plain HTML form validation, and not make it worse.