Prevent or better support entirely deselected radio buttons

[ebruchez]

HTML supports having a set of radio buttons of which none are selected. And Form Builder allows you to set radio buttons this way. This can be confusing because you can go from deselected → selected, but not the other way around.

Two approaches:

• Require having a default value.
• Support a "none" option which matches to the empty string.
  • But right now, Form Builder doesn't allow you to set the empty string as value, while it should!

+1 from customer

[ebruchez]

So the quickest fix is to allow setting the empty string for single-selection controls in Edit Choices.

[avernet]

Note that this could be done automatically, based on whether the field is marked as required by form authors in Form Builder:

• If required:
  • The field is invalid if the value is left empty.
  • Having a way for users to reset a selection isn't necessary.
• If optional:
  • Not selecting any radio is OK.
  • We must provide a way for users to reset a selection they've made.

[ebruchez]

Having all radios deselected forces the user to do something, true, but even if required, it is weird to be able to go from deselected → selected, but not the other way around.

We had discussed something similar for fr:dropdown-select1, where I had proposed that once you have selected a value you cannot go back to blank, and we had decided that although cool it was not a good idea. The same logic should probably apply to radio buttons.

[avernet]

I agree.